> -----Original Message-----
> From: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
> Sent: 2024年11月27日 3:21
> To: Sandor Yu <sandor.yu@xxxxxxx>
> Cc: andrzej.hajda@xxxxxxxxx; neil.armstrong@xxxxxxxxxx; Laurent Pinchart
> <laurent.pinchart@xxxxxxxxxxxxxxxx>; jonas@xxxxxxxxx;
> jernej.skrabec@xxxxxxxxx; airlied@xxxxxxxxx; daniel@xxxxxxxx;
> robh+dt@xxxxxxxxxx; krzysztof.kozlowski+dt@xxxxxxxxxx;
> shawnguo@xxxxxxxxxx; s.hauer@xxxxxxxxxxxxxx; festevam@xxxxxxxxx;
> vkoul@xxxxxxxxxx; dri-devel@xxxxxxxxxxxxxxxxxxxxx;
> devicetree@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> linux-kernel@xxxxxxxxxxxxxxx; linux-phy@xxxxxxxxxxxxxxxxxxx;
> mripard@xxxxxxxxxx; kernel@xxxxxxxxxxxxxx; dl-linux-imx
> <linux-imx@xxxxxxx>; Oliver Brown <oliver.brown@xxxxxxx>;
> alexander.stein@xxxxxxxxxxxxxxx; sam@xxxxxxxxxxxx
> Subject: [EXT] Re: [PATCH v19 4/8] drm: bridge: Cadence: Add MHDP8501
> DP/HDMI driver
>
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>
> On Tue, Nov 26, 2024 at 10:11:49PM +0800, Sandor Yu wrote:
> > Add a new DRM DisplayPort and HDMI bridge driver for Candence
> MHDP8501
> > used in i.MX8MQ SOC. MHDP8501 could support HDMI or DisplayPort
> > standards according embedded Firmware running in the uCPU.
> >
> > For iMX8MQ SOC, the DisplayPort/HDMI FW was loaded and activated by
> > SOC's ROM code. Bootload binary included respective specific firmware
> > is required.
> >
> > Driver will check display connector type and
> > then load the corresponding driver.
> >
> > Signed-off-by: Sandor Yu <Sandor.yu@xxxxxxx>
> > ---
> > v18->v19:
> > - Get endpoint for data-lanes as it had move to endpoint of port@1
> > - Update clock management as devm_clk_get_enabled() introduced.
> > - Fix clear_infoframe() function is not work issue.
> > - Manage PHY power state via phy_power_on() and phy_power_off().
> >
> > v17->v18:
> > - MHDP8501 HDMI and DP commands that need access mailbox are
> rewrited
> > with new API functions created in patch #1.
> > - replace lane-mapping with data-lanes, use the value from data-lanes
> > to reorder HDMI and DP lane mapping.
> > - create I2C adapter for HDMI SCDC, remove cdns_hdmi_scdc_write()
> function.
> > - Rewrite cdns_hdmi_sink_config() function, use HDMI SCDC helper function
> > drm_scdc_set_high_tmds_clock_ratio() and drm_scdc_set_scrambling()
> > to config HDMI sink TMDS.
> > - Remove struct video_info from HDMI driver.
> > - Remove tmds_char_rate_valid() be called in bridge_mode_valid(),
> > community had patch in reviewing to implement the function.
> > - Remove warning message print when get unknown HPD cable status.
> > - Add more detail comments for HDP plugin and plugout interrupt.
> > - use dev_dbg to repleace DRM_INFO when cable HPD status changed.
> > - Remove t-b tag as above code change.
> >
> > drivers/gpu/drm/bridge/cadence/Kconfig | 16 +
> > drivers/gpu/drm/bridge/cadence/Makefile | 2 +
> > .../drm/bridge/cadence/cdns-mhdp8501-core.c | 322 ++++++++
> > .../drm/bridge/cadence/cdns-mhdp8501-core.h | 376 +++++++++
> > .../gpu/drm/bridge/cadence/cdns-mhdp8501-dp.c | 686
> ++++++++++++++++
> > .../drm/bridge/cadence/cdns-mhdp8501-hdmi.c | 764
> ++++++++++++++++++
> > 6 files changed, 2166 insertions(+)
> > create mode 100644
> drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-core.c
> > create mode 100644
> drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-core.h
> > create mode 100644
> drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-dp.c
> > create mode 100644
> drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-hdmi.c
> >
> > diff --git a/drivers/gpu/drm/bridge/cadence/Kconfig
> b/drivers/gpu/drm/bridge/cadence/Kconfig
> > index 1b315593a6d73..dc7a0466bb020 100644
> > --- a/drivers/gpu/drm/bridge/cadence/Kconfig
> > +++ b/drivers/gpu/drm/bridge/cadence/Kconfig
> > @@ -55,3 +55,19 @@ config DRM_CDNS_MHDP8546_J721E
> > initializes the J721E Display Port and sets up the
> > clock and data muxes.
> > endif
> > +
> > +config DRM_CDNS_MHDP8501
> > + tristate "Cadence MHDP8501 DP/HDMI bridge"
> > + select DRM_KMS_HELPER
> > + select DRM_PANEL_BRIDGE
> > + select DRM_DISPLAY_DP_HELPER
> > + select DRM_DISPLAY_HELPER
> > + select CDNS_MHDP_HELPER
> > + select DRM_CDNS_AUDIO
> > + depends on OF
> > + help
> > + Support Cadence MHDP8501 DisplayPort/HDMI bridge.
> > + Cadence MHDP8501 support one or more protocols,
> > + including DisplayPort and HDMI.
> > + To use the DP and HDMI drivers, their respective
> > + specific firmware is required.
> > diff --git a/drivers/gpu/drm/bridge/cadence/Makefile
> b/drivers/gpu/drm/bridge/cadence/Makefile
> > index 087dc074820d7..02c1a9f3cf6fc 100644
> > --- a/drivers/gpu/drm/bridge/cadence/Makefile
> > +++ b/drivers/gpu/drm/bridge/cadence/Makefile
> > @@ -6,3 +6,5 @@ obj-$(CONFIG_CDNS_MHDP_HELPER) +=
> cdns-mhdp-helper.o
> > obj-$(CONFIG_DRM_CDNS_MHDP8546) += cdns-mhdp8546.o
> > cdns-mhdp8546-y := cdns-mhdp8546-core.o cdns-mhdp8546-hdcp.o
> > cdns-mhdp8546-$(CONFIG_DRM_CDNS_MHDP8546_J721E) +=
> cdns-mhdp8546-j721e.o
> > +obj-$(CONFIG_DRM_CDNS_MHDP8501) += cdns-mhdp8501.o
> > +cdns-mhdp8501-y := cdns-mhdp8501-core.o cdns-mhdp8501-dp.o
> cdns-mhdp8501-hdmi.o
> > diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-core.c
> b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-core.c
> > new file mode 100644
> > index 0000000000000..c51696b586dd0
> > --- /dev/null
> > +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-core.c
> > @@ -0,0 +1,322 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * Cadence Display Port Interface (DP) driver
> > + *
> > + * Copyright (C) 2023-2024 NXP Semiconductor, Inc.
> > + *
> > + */
> > +#include <drm/drm_of.h>
> > +#include <drm/drm_print.h>
> > +#include <linux/clk.h>
> > +#include <linux/irq.h>
> > +#include <linux/mutex.h>
> > +#include <linux/of_device.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/phy/phy.h>
> > +
> > +#include "cdns-mhdp8501-core.h"
> > +
> > +static int cdns_mhdp8501_read_hpd(struct cdns_mhdp8501_device
> *mhdp)
> > +{
> > + u8 status;
> > + int ret;
> > +
> > + ret = cdns_mhdp_mailbox_send_recv(&mhdp->base,
> MB_MODULE_ID_GENERAL,
> > +
> GENERAL_GET_HPD_STATE,
> > + 0, NULL, sizeof(status),
> &status);
> > + if (ret) {
> > + dev_err(mhdp->dev, "read hpd failed: %d\n", ret);
> > + return ret;
> > + }
> > +
> > + return status;
> > +}
> > +
> > +enum drm_connector_status cdns_mhdp8501_detect(struct
> cdns_mhdp8501_device *mhdp)
> > +{
> > + u8 hpd = 0xf;
> > +
> > + hpd = cdns_mhdp8501_read_hpd(mhdp);
> > + if (hpd == 1)
> > + return connector_status_connected;
> > + else if (hpd == 0)
> > + return connector_status_disconnected;
> > +
> > + return connector_status_unknown;
> > +}
> > +
> > +static void hotplug_work_func(struct work_struct *work)
> > +{
> > + struct cdns_mhdp8501_device *mhdp = container_of(work,
> > + struct
> cdns_mhdp8501_device,
> > +
> hotplug_work.work);
> > + enum drm_connector_status status =
> cdns_mhdp8501_detect(mhdp);
> > +
> > + drm_bridge_hpd_notify(&mhdp->bridge, status);
> > +
> > + /*
> > + * iMX8MQ has two HPD interrupts: one for plugout and one for
> plugin.
> > + * These interrupts cannot be masked and cleaned, so we must
> enable one
> > + * and disable the other to avoid continuous interrupt generation.
> > + */
> > + if (status == connector_status_connected) {
> > + /* Cable connected */
> > + dev_dbg(mhdp->dev, "HDMI/DP Cable Plug In\n");
> > + enable_irq(mhdp->irq[IRQ_OUT]);
> > +
> > + /* Reset HDMI/DP link with sink */
> > + if (mhdp->connector_type ==
> DRM_MODE_CONNECTOR_HDMIA)
> > + cdns_hdmi_reset_link(mhdp);
> > + else
> > + cdns_dp_check_link_state(mhdp);
> > +
> > + } else if (status == connector_status_disconnected) {
> > + /* Cable Disconnected */
> > + dev_dbg(mhdp->dev, "HDMI/DP Cable Plug Out\n");
> > + enable_irq(mhdp->irq[IRQ_IN]);
> > + }
> > +}
> > +
> > +static irqreturn_t cdns_mhdp8501_irq_thread(int irq, void *data)
> > +{
> > + struct cdns_mhdp8501_device *mhdp = data;
> > +
> > + disable_irq_nosync(irq);
> > +
> > + mod_delayed_work(system_wq, &mhdp->hotplug_work,
> > + msecs_to_jiffies(HOTPLUG_DEBOUNCE_MS));
> > +
> > + return IRQ_HANDLED;
> > +}
> > +
> > +#define DATA_LANES_COUNT 4
> > +static int cdns_mhdp8501_dt_parse(struct cdns_mhdp8501_device
> *mhdp,
> > + struct platform_device *pdev)
> > +{
> > + struct device *dev = &pdev->dev;
> > + struct device_node *np = dev->of_node;
> > + struct device_node *remote, *endpoint;
> > + u32 data_lanes[DATA_LANES_COUNT];
> > + u32 lane_value;
> > + int ret, i;
> > +
> > + remote = of_graph_get_remote_node(np, 1, 0);
> > + if (!remote) {
> > + dev_err(dev, "fail to get remote node\n");
> > + of_node_put(remote);
> > + return -EINVAL;
> > + }
> > +
> > + /* get connector type */
> > + if (of_device_is_compatible(remote, "hdmi-connector")) {
> > + mhdp->connector_type =
> DRM_MODE_CONNECTOR_HDMIA;
> > +
> > + } else if (of_device_is_compatible(remote, "dp-connector")) {
> > + mhdp->connector_type =
> DRM_MODE_CONNECTOR_DisplayPort;
> > +
> > + } else {
> > + dev_err(dev, "Unknown connector type\n");
> > + of_node_put(remote);
> > + return -EINVAL;
> > + }
> > +
> > + of_node_put(remote);
> > +
> > + endpoint = of_graph_get_endpoint_by_regs(np, 1, -1);
> > +
> > + /* Get the data lanes ordering */
> > + ret = of_property_count_u32_elems(endpoint, "data-lanes");
> > + if (ret < 0)
> > + return -EINVAL;
> > + if (ret != DATA_LANES_COUNT) {
> > + dev_err(dev, "expected 4 data lanes\n");
> > + return -EINVAL;
> > + }
> > +
> > + ret = of_property_read_u32_array(endpoint, "data-lanes",
> > + data_lanes,
> DATA_LANES_COUNT);
> > + if (ret)
> > + return -EINVAL;
> > +
> > + mhdp->lane_mapping = 0;
> > + for (i = 0; i < DATA_LANES_COUNT; i++) {
> > + lane_value = (data_lanes[i] >= 0 && data_lanes[i] <= 3) ?
> data_lanes[i] : 0;
> > + mhdp->lane_mapping |= lane_value << (i * 2);
> > + }
> > +
> > + return true;
> > +}
> > +
> > +static int cdns_mhdp8501_add_bridge(struct cdns_mhdp8501_device
> *mhdp)
> > +{
> > + mhdp->bridge.type = mhdp->connector_type;
> > + mhdp->bridge.driver_private = mhdp;
> > + mhdp->bridge.of_node = mhdp->dev->of_node;
> > + mhdp->bridge.vendor = "NXP";
> > + mhdp->bridge.product = "i.MX8";
> > + mhdp->bridge.ops = DRM_BRIDGE_OP_DETECT |
> DRM_BRIDGE_OP_EDID |
> > + DRM_BRIDGE_OP_HPD;
> > +
> > + if (mhdp->connector_type == DRM_MODE_CONNECTOR_HDMIA) {
> > + mhdp->bridge.funcs = &cdns_hdmi_bridge_funcs;
> > + mhdp->bridge.ops |= DRM_BRIDGE_OP_HDMI;
> > + mhdp->bridge.ddc = cdns_hdmi_i2c_adapter(mhdp);
> > + } else if (mhdp->connector_type ==
> DRM_MODE_CONNECTOR_DisplayPort) {
> > + mhdp->bridge.funcs = &cdns_dp_bridge_funcs;
> > + } else {
> > + dev_err(mhdp->dev, "Unsupported connector type!\n");
> > + return -EINVAL;
> > + }
> > +
> > + drm_bridge_add(&mhdp->bridge);
> > +
> > + return 0;
> > +}
> > +
> > +static int cdns_mhdp8501_probe(struct platform_device *pdev)
> > +{
> > + struct device *dev = &pdev->dev;
> > + struct cdns_mhdp8501_device *mhdp;
> > + struct resource *res;
> > + enum phy_mode phy_mode;
> > + u32 reg;
> > + int ret;
> > +
> > + mhdp = devm_kzalloc(dev, sizeof(*mhdp), GFP_KERNEL);
> > + if (!mhdp)
> > + return -ENOMEM;
> > +
> > + mhdp->dev = dev;
> > +
> > + INIT_DELAYED_WORK(&mhdp->hotplug_work, hotplug_work_func);
> > +
> > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > + if (!res)
> > + return -ENODEV;
> > +
> > + mhdp->regs = devm_ioremap(dev, res->start, resource_size(res));
> > + if (IS_ERR(mhdp->regs))
> > + return PTR_ERR(mhdp->regs);
> > +
> > + ret = cdns_mhdp8501_dt_parse(mhdp, pdev);
> > + if (ret < 0)
> > + return -EINVAL;
> > +
> > + mhdp->phy = devm_of_phy_get_by_index(dev, pdev->dev.of_node,
> 0);
> > + if (IS_ERR(mhdp->phy))
> > + return dev_err_probe(dev, PTR_ERR(mhdp->phy), "no PHY
> configured\n");
> > +
> > + mhdp->irq[IRQ_IN] = platform_get_irq_byname(pdev, "plug_in");
> > + if (mhdp->irq[IRQ_IN] < 0)
> > + return dev_err_probe(dev, mhdp->irq[IRQ_IN], "No
> plug_in irq number\n");
> > +
> > + mhdp->irq[IRQ_OUT] = platform_get_irq_byname(pdev,
> "plug_out");
> > + if (mhdp->irq[IRQ_OUT] < 0)
> > + return dev_err_probe(dev, mhdp->irq[IRQ_OUT], "No
> plug_out irq number\n");
> > +
> > + irq_set_status_flags(mhdp->irq[IRQ_IN], IRQ_NOAUTOEN);
> > + ret = devm_request_threaded_irq(dev, mhdp->irq[IRQ_IN],
> > + NULL,
> cdns_mhdp8501_irq_thread,
> > + IRQF_ONESHOT,
> dev_name(dev), mhdp);
> > + if (ret < 0) {
> > + dev_err(dev, "can't claim irq %d\n", mhdp->irq[IRQ_IN]);
> > + return -EINVAL;
> > + }
> > +
> > + irq_set_status_flags(mhdp->irq[IRQ_OUT], IRQ_NOAUTOEN);
> > + ret = devm_request_threaded_irq(dev, mhdp->irq[IRQ_OUT],
> > + NULL,
> cdns_mhdp8501_irq_thread,
> > + IRQF_ONESHOT,
> dev_name(dev), mhdp);
> > + if (ret < 0) {
> > + dev_err(dev, "can't claim irq %d\n",
> mhdp->irq[IRQ_OUT]);
> > + return -EINVAL;
> > + }
> > +
> > + /* cdns_mhdp8501_dt_parse() ensures connector_type is valid */
> > + if (mhdp->connector_type ==
> DRM_MODE_CONNECTOR_DisplayPort)
> > + phy_mode = PHY_MODE_DP;
> > + else if (mhdp->connector_type ==
> DRM_MODE_CONNECTOR_HDMIA)
> > + phy_mode = PHY_MODE_HDMI;
> > +
> > + dev_set_drvdata(dev, mhdp);
> > +
> > + /* init base struct for access mhdp mailbox */
> > + mhdp->base.dev = mhdp->dev;
> > + mhdp->base.regs = mhdp->regs;
> > +
> > + if (mhdp->connector_type ==
> DRM_MODE_CONNECTOR_DisplayPort) {
> > + drm_dp_aux_init(&mhdp->dp.aux);
> > + mhdp->dp.aux.name = "mhdp8501_dp_aux";
> > + mhdp->dp.aux.dev = dev;
> > + mhdp->dp.aux.transfer = cdns_dp_aux_transfer;
> > + }
> > +
> > + /* Enable APB clock */
> > + mhdp->apb_clk = devm_clk_get_enabled(dev, NULL);
> > + if (IS_ERR(mhdp->apb_clk))
> > + return dev_err_probe(dev, PTR_ERR(mhdp->apb_clk),
> > + "couldn't get apb clk\n");
> > + /*
> > + * Wait for the KEEP_ALIVE "message" on the first 8 bits.
> > + * Updated each sched "tick" (~2ms)
> > + */
> > + ret = readl_poll_timeout(mhdp->regs + KEEP_ALIVE, reg,
> > + reg & CDNS_KEEP_ALIVE_MASK,
> 500,
> > + CDNS_KEEP_ALIVE_TIMEOUT);
> > + if (ret) {
> > + dev_err(dev, "device didn't give any life sign: reg %d\n",
> reg);
> > + return ret;
> > + }
> > +
> > + ret = phy_init(mhdp->phy);
> > + if (ret) {
> > + dev_err(dev, "Failed to initialize PHY: %d\n", ret);
> > + return ret;
> > + }
> > +
> > + ret = phy_set_mode(mhdp->phy, phy_mode);
> > + if (ret) {
> > + dev_err(dev, "Failed to configure PHY: %d\n", ret);
> > + return ret;
> > + }
> > +
> > + /* Enable cable hotplug detect */
> > + if (cdns_mhdp8501_read_hpd(mhdp))
> > + enable_irq(mhdp->irq[IRQ_OUT]);
> > + else
> > + enable_irq(mhdp->irq[IRQ_IN]);
> > +
> > + return cdns_mhdp8501_add_bridge(mhdp);
> > +}
> > +
> > +static void cdns_mhdp8501_remove(struct platform_device *pdev)
> > +{
> > + struct cdns_mhdp8501_device *mhdp =
> platform_get_drvdata(pdev);
> > +
> > + if (mhdp->connector_type ==
> DRM_MODE_CONNECTOR_DisplayPort)
> > + cdns_dp_aux_destroy(mhdp);
> > +
> > + drm_bridge_remove(&mhdp->bridge);
> > +}
> > +
> > +static const struct of_device_id cdns_mhdp8501_dt_ids[] = {
> > + { .compatible = "fsl,imx8mq-mhdp8501",
> > + },
> > + { },
> > +};
> > +MODULE_DEVICE_TABLE(of, cdns_mhdp8501_dt_ids);
> > +
> > +static struct platform_driver cdns_mhdp8501_driver = {
> > + .probe = cdns_mhdp8501_probe,
> > + .remove = cdns_mhdp8501_remove,
> > + .driver = {
> > + .name = "cdns-mhdp8501",
> > + .of_match_table = cdns_mhdp8501_dt_ids,
> > + },
> > +};
> > +
> > +module_platform_driver(cdns_mhdp8501_driver);
> > +
> > +MODULE_AUTHOR("Sandor Yu <sandor.yu@xxxxxxx>");
> > +MODULE_DESCRIPTION("Cadence MHDP8501 bridge driver");
> > +MODULE_LICENSE("GPL");
> > diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-core.h
> b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-core.h
> > new file mode 100644
> > index 0000000000000..a8b7e54f629e2
> > --- /dev/null
> > +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-core.h
> > @@ -0,0 +1,376 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Cadence MHDP 8501 Common head file
> > + *
> > + * Copyright (C) 2019-2024 NXP Semiconductor, Inc.
> > + *
> > + */
> > +
> > +#ifndef _CDNS_MHDP8501_CORE_H_
> > +#define _CDNS_MHDP8501_CORE_H_
> > +
> > +#include <drm/bridge/cdns-mhdp-helper.h>
> > +#include <drm/drm_bridge.h>
> > +#include <drm/drm_connector.h>
> > +#include <drm/display/drm_dp_helper.h>
> > +#include <linux/bitops.h>
> > +#include <linux/i2c.h>
> > +
> > +#define ADDR_IMEM 0x10000
> > +#define ADDR_DMEM 0x20000
> > +
> > +/* APB CFG addr */
> > +#define APB_CTRL 0
> > +#define XT_INT_CTRL 0x04
> > +#define MAILBOX_FULL_ADDR 0x08
> > +#define MAILBOX_EMPTY_ADDR 0x0c
> > +#define MAILBOX0_WR_DATA 0x10
> > +#define MAILBOX0_RD_DATA 0x14
> > +#define KEEP_ALIVE 0x18
> > +#define VER_L 0x1c
> > +#define VER_H 0x20
> > +#define VER_LIB_L_ADDR 0x24
> > +#define VER_LIB_H_ADDR 0x28
> > +#define SW_DEBUG_L 0x2c
> > +#define SW_DEBUG_H 0x30
> > +#define MAILBOX_INT_MASK 0x34
> > +#define MAILBOX_INT_STATUS 0x38
> > +#define SW_CLK_L 0x3c
> > +#define SW_CLK_H 0x40
> > +#define SW_EVENTS0 0x44
> > +#define SW_EVENTS1 0x48
> > +#define SW_EVENTS2 0x4c
> > +#define SW_EVENTS3 0x50
> > +#define XT_OCD_CTRL 0x60
> > +#define APB_INT_MASK 0x6c
> > +#define APB_STATUS_MASK 0x70
> > +
> > +/* Source phy comp */
> > +#define PHY_DATA_SEL 0x0818
> > +#define LANES_CONFIG 0x0814
> > +
> > +/* Source CAR Addr */
> > +#define SOURCE_HDTX_CAR 0x0900
> > +#define SOURCE_DPTX_CAR 0x0904
> > +#define SOURCE_PHY_CAR 0x0908
> > +#define SOURCE_CEC_CAR 0x090c
> > +#define SOURCE_CBUS_CAR 0x0910
> > +#define SOURCE_PKT_CAR 0x0918
> > +#define SOURCE_AIF_CAR 0x091c
> > +#define SOURCE_CIPHER_CAR 0x0920
> > +#define SOURCE_CRYPTO_CAR 0x0924
> > +
> > +/* clock meters addr */
> > +#define CM_CTRL 0x0a00
> > +#define CM_I2S_CTRL 0x0a04
> > +#define CM_SPDIF_CTRL 0x0a08
> > +#define CM_VID_CTRL 0x0a0c
> > +#define CM_LANE_CTRL 0x0a10
> > +#define I2S_NM_STABLE 0x0a14
> > +#define I2S_NCTS_STABLE 0x0a18
> > +#define SPDIF_NM_STABLE 0x0a1c
> > +#define SPDIF_NCTS_STABLE 0x0a20
> > +#define NMVID_MEAS_STABLE 0x0a24
> > +#define I2S_MEAS 0x0a40
> > +#define SPDIF_MEAS 0x0a80
> > +#define NMVID_MEAS 0x0ac0
> > +
> > +/* source vif addr */
> > +#define BND_HSYNC2VSYNC 0x0b00
> > +#define HSYNC2VSYNC_F1_L1 0x0b04
> > +#define HSYNC2VSYNC_STATUS 0x0b0c
> > +#define HSYNC2VSYNC_POL_CTRL 0x0b10
> > +
> > +/* MHDP TX_top_comp */
> > +#define SCHEDULER_H_SIZE 0x1000
> > +#define SCHEDULER_V_SIZE 0x1004
> > +#define HDTX_SIGNAL_FRONT_WIDTH 0x100c
> > +#define HDTX_SIGNAL_SYNC_WIDTH 0x1010
> > +#define HDTX_SIGNAL_BACK_WIDTH 0x1014
> > +#define HDTX_CONTROLLER 0x1018
> > +#define HDTX_HPD 0x1020
> > +#define HDTX_CLOCK_REG_0 0x1024
> > +#define HDTX_CLOCK_REG_1 0x1028
> > +
> > +/* DPTX hpd addr */
> > +#define HPD_IRQ_DET_MIN_TIMER 0x2100
> > +#define HPD_IRQ_DET_MAX_TIMER 0x2104
> > +#define HPD_UNPLGED_DET_MIN_TIMER 0x2108
> > +#define HPD_STABLE_TIMER 0x210c
> > +#define HPD_FILTER_TIMER 0x2110
> > +#define HPD_EVENT_MASK 0x211c
> > +#define HPD_EVENT_DET 0x2120
> > +
> > +/* DPTX framer addr */
> > +#define DP_FRAMER_GLOBAL_CONFIG 0x2200
> > +#define DP_SW_RESET 0x2204
> > +#define DP_FRAMER_TU 0x2208
> > +#define DP_FRAMER_PXL_REPR 0x220c
> > +#define DP_FRAMER_SP 0x2210
> > +#define AUDIO_PACK_CONTROL 0x2214
> > +#define DP_VC_TABLE(x) (0x2218 + ((x) << 2))
> > +#define DP_VB_ID 0x2258
> > +#define DP_MTPH_LVP_CONTROL 0x225c
> > +#define DP_MTPH_SYMBOL_VALUES 0x2260
> > +#define DP_MTPH_ECF_CONTROL 0x2264
> > +#define DP_MTPH_ACT_CONTROL 0x2268
> > +#define DP_MTPH_STATUS 0x226c
> > +#define DP_INTERRUPT_SOURCE 0x2270
> > +#define DP_INTERRUPT_MASK 0x2274
> > +#define DP_FRONT_BACK_PORCH 0x2278
> > +#define DP_BYTE_COUNT 0x227c
> > +
> > +/* DPTX stream addr */
> > +#define MSA_HORIZONTAL_0 0x2280
> > +#define MSA_HORIZONTAL_1 0x2284
> > +#define MSA_VERTICAL_0 0x2288
> > +#define MSA_VERTICAL_1 0x228c
> > +#define MSA_MISC 0x2290
> > +#define STREAM_CONFIG 0x2294
> > +#define AUDIO_PACK_STATUS 0x2298
> > +#define VIF_STATUS 0x229c
> > +#define PCK_STUFF_STATUS_0 0x22a0
> > +#define PCK_STUFF_STATUS_1 0x22a4
> > +#define INFO_PACK_STATUS 0x22a8
> > +#define RATE_GOVERNOR_STATUS 0x22ac
> > +#define DP_HORIZONTAL 0x22b0
> > +#define DP_VERTICAL_0 0x22b4
> > +#define DP_VERTICAL_1 0x22b8
> > +#define DP_BLOCK_SDP 0x22bc
> > +
> > +/* DPTX glbl addr */
> > +#define DPTX_LANE_EN 0x2300
> > +#define DPTX_ENHNCD 0x2304
> > +#define DPTX_INT_MASK 0x2308
> > +#define DPTX_INT_STATUS 0x230c
> > +
> > +/* DP AUX Addr */
> > +#define DP_AUX_HOST_CONTROL 0x2800
> > +#define DP_AUX_INTERRUPT_SOURCE 0x2804
> > +#define DP_AUX_INTERRUPT_MASK 0x2808
> > +#define DP_AUX_SWAP_INVERSION_CONTROL 0x280c
> > +#define DP_AUX_SEND_NACK_TRANSACTION 0x2810
> > +#define DP_AUX_CLEAR_RX 0x2814
> > +#define DP_AUX_CLEAR_TX 0x2818
> > +#define DP_AUX_TIMER_STOP 0x281c
> > +#define DP_AUX_TIMER_CLEAR 0x2820
> > +#define DP_AUX_RESET_SW 0x2824
> > +#define DP_AUX_DIVIDE_2M 0x2828
> > +#define DP_AUX_TX_PREACHARGE_LENGTH 0x282c
> > +#define DP_AUX_FREQUENCY_1M_MAX 0x2830
> > +#define DP_AUX_FREQUENCY_1M_MIN 0x2834
> > +#define DP_AUX_RX_PRE_MIN 0x2838
> > +#define DP_AUX_RX_PRE_MAX 0x283c
> > +#define DP_AUX_TIMER_PRESET 0x2840
> > +#define DP_AUX_NACK_FORMAT 0x2844
> > +#define DP_AUX_TX_DATA 0x2848
> > +#define DP_AUX_RX_DATA 0x284c
> > +#define DP_AUX_TX_STATUS 0x2850
> > +#define DP_AUX_RX_STATUS 0x2854
> > +#define DP_AUX_RX_CYCLE_COUNTER 0x2858
> > +#define DP_AUX_MAIN_STATES 0x285c
> > +#define DP_AUX_MAIN_TIMER 0x2860
> > +#define DP_AUX_AFE_OUT 0x2864
> > +
> > +/* source pif addr */
> > +#define SOURCE_PIF_WR_ADDR 0x30800
> > +#define SOURCE_PIF_WR_REQ 0x30804
> > +#define SOURCE_PIF_RD_ADDR 0x30808
> > +#define SOURCE_PIF_RD_REQ 0x3080c
> > +#define SOURCE_PIF_DATA_WR 0x30810
> > +#define SOURCE_PIF_DATA_RD 0x30814
> > +#define SOURCE_PIF_FIFO1_FLUSH 0x30818
> > +#define SOURCE_PIF_FIFO2_FLUSH 0x3081c
> > +#define SOURCE_PIF_STATUS 0x30820
> > +#define SOURCE_PIF_INTERRUPT_SOURCE 0x30824
> > +#define SOURCE_PIF_INTERRUPT_MASK 0x30828
> > +#define SOURCE_PIF_PKT_ALLOC_REG 0x3082c
> > +#define SOURCE_PIF_PKT_ALLOC_WR_EN 0x30830
> > +#define SOURCE_PIF_SW_RESET 0x30834
> > +
> > +#define LINK_TRAINING_NOT_ACTIV 0
> > +#define LINK_TRAINING_RUN 1
> > +#define LINK_TRAINING_RESTART 2
> > +
> > +#define CONTROL_VIDEO_IDLE 0
> > +#define CONTROL_VIDEO_VALID 1
> > +
> > +#define INTERLACE_FMT_DET BIT(12)
> > +#define VIF_BYPASS_INTERLACE BIT(13)
> > +#define TU_CNT_RST_EN BIT(15)
> > +#define INTERLACE_DTCT_WIN 0x20
> > +
> > +#define DP_FRAMER_SP_INTERLACE_EN BIT(2)
> > +#define DP_FRAMER_SP_HSP BIT(1)
> > +#define DP_FRAMER_SP_VSP BIT(0)
> > +
> > +/* Capability */
> > +#define AUX_HOST_INVERT 3
> > +#define FAST_LT_SUPPORT 1
> > +#define FAST_LT_NOT_SUPPORT 0
> > +#define LANE_MAPPING_FLIPPED 0xe4
> > +#define ENHANCED 1
> > +#define SCRAMBLER_EN BIT(4)
> > +
> > +#define FULL_LT_STARTED BIT(0)
> > +#define FASE_LT_STARTED BIT(1)
> > +#define CLK_RECOVERY_FINISHED BIT(2)
> > +#define EQ_PHASE_FINISHED BIT(3)
> > +#define FASE_LT_START_FINISHED BIT(4)
> > +#define CLK_RECOVERY_FAILED BIT(5)
> > +#define EQ_PHASE_FAILED BIT(6)
> > +#define FASE_LT_FAILED BIT(7)
> > +
> > +#define TU_SIZE 30
> > +#define CDNS_DP_MAX_LINK_RATE 540000
> > +
> > +#define F_HDMI2_CTRL_IL_MODE(x) (((x) & ((1 << 1) - 1))
> << 19)
> > +#define F_HDMI2_PREAMBLE_EN(x) (((x) & ((1 << 1) - 1))
> << 18)
> > +#define F_HDMI_ENCODING(x) (((x) & ((1 << 2) - 1)) << 16)
> > +#define F_DATA_EN(x) (((x) & ((1 << 1) - 1)) << 15)
> > +#define F_CLEAR_AVMUTE(x) (((x) & ((1 << 1) - 1)) << 14)
> > +#define F_SET_AVMUTE(x) (((x) & ((1 << 1) - 1))
> << 13)
> > +#define F_GCP_EN(x) (((x) & ((1 << 1) - 1)) << 12)
> > +#define F_BCH_EN(x) (((x) & ((1 << 1) - 1)) << 11)
> > +#define F_PIC_3D(x) (((x) & ((1 << 4) - 1)) << 7)
> > +#define F_VIF_DATA_WIDTH(x) (((x) & ((1 << 2) - 1)) << 2)
> > +#define F_HDMI_MODE(x) (((x) & ((1 << 2) - 1))
> << 0)
> > +
> > +#define F_SOURCE_PHY_MHDP_SEL(x) (((x) & ((1 << 2) - 1)) << 3)
> > +
> > +#define F_HPD_GLITCH_WIDTH(x) (((x) & ((1 << 8) - 1))
> << 12)
> > +#define F_PACKET_TYPE(x) (((x) & ((1 << 8) - 1)) << 8)
> > +#define F_HPD_VALID_WIDTH(x) (((x) & ((1 << 12) - 1)) << 0)
> > +
> > +#define F_SOURCE_PHY_LANE3_SWAP(x) (((x) & ((1 << 2) - 1)) << 6)
> > +#define F_SOURCE_PHY_LANE2_SWAP(x) (((x) & ((1 << 2) - 1)) << 4)
> > +#define F_SOURCE_PHY_LANE1_SWAP(x) (((x) & ((1 << 2) - 1)) << 2)
> > +#define F_SOURCE_PHY_LANE0_SWAP(x) (((x) & ((1 << 2) - 1)) << 0)
> > +
> > +#define F_ACTIVE_IDLE_TYPE(x) (((x) & ((1 << 1) - 1)) <<
> 17)
> > +#define F_TYPE_VALID(x) (((x) & ((1 << 1) - 1))
> << 16)
> > +#define F_PKT_ALLOC_ADDRESS(x) (((x) & ((1 << 4) - 1))
> << 0)
> > +
> > +#define F_FIFO1_FLUSH(x) (((x) & ((1 << 1) - 1)) << 0)
> > +#define F_PKT_ALLOC_WR_EN(x) (((x) & ((1 << 1) - 1)) << 0)
> > +#define F_DATA_WR(x) (x)
> > +#define F_WR_ADDR(x) (((x) & ((1 << 4) - 1)) << 0)
> > +#define F_HOST_WR(x) (((x) & ((1 << 1) - 1)) << 0)
> > +
> > +/* Reference cycles when using lane clock as reference */
> > +#define LANE_REF_CYC 0x8000
> > +
> > +/* HPD Debounce */
> > +#define HOTPLUG_DEBOUNCE_MS 200
> > +
> > +/* HPD IRQ Index */
> > +#define IRQ_IN 0
> > +#define IRQ_OUT 1
> > +#define IRQ_NUM 2
> > +
> > +/* FW check alive timeout */
> > +#define CDNS_KEEP_ALIVE_TIMEOUT 2000
> > +#define CDNS_KEEP_ALIVE_MASK GENMASK(7, 0)
> > +
> > +enum voltage_swing_level {
> > + VOLTAGE_LEVEL_0,
> > + VOLTAGE_LEVEL_1,
> > + VOLTAGE_LEVEL_2,
> > + VOLTAGE_LEVEL_3,
> > +};
> > +
> > +enum pre_emphasis_level {
> > + PRE_EMPHASIS_LEVEL_0,
> > + PRE_EMPHASIS_LEVEL_1,
> > + PRE_EMPHASIS_LEVEL_2,
> > + PRE_EMPHASIS_LEVEL_3,
> > +};
> > +
> > +enum pattern_set {
> > + PTS1 = BIT(0),
> > + PTS2 = BIT(1),
> > + PTS3 = BIT(2),
> > + PTS4 = BIT(3),
> > + DP_NONE = BIT(4)
> > +};
> > +
> > +enum vic_color_depth {
> > + BCS_6 = 0x1,
> > + BCS_8 = 0x2,
> > + BCS_10 = 0x4,
> > + BCS_12 = 0x8,
> > + BCS_16 = 0x10,
> > +};
> > +
> > +enum vic_bt_type {
> > + BT_601 = 0x0,
> > + BT_709 = 0x1,
> > +};
> > +
> > +enum {
> > + MODE_DVI,
> > + MODE_HDMI_1_4,
> > + MODE_HDMI_2_0,
> > +};
> > +
> > +struct video_info {
> > + int bpc;
> > + int color_fmt;
> > +};
> > +
> > +struct cdns_hdmi_i2c {
> > + struct i2c_adapter adap;
> > +
> > + struct mutex lock; /* used to serialize data
> transfers */
> > + struct completion cmp;
> > + u8 stat;
> > +
> > + u8 slave_reg;
> > + bool is_regaddr;
> > + bool is_segment;
> > +};
> > +
> > +struct cdns_mhdp8501_device {
> > + struct cdns_mhdp_base base;
> > +
> > + struct device *dev;
> > + void __iomem *regs;
> > + struct drm_connector *curr_conn;
> > + struct drm_bridge bridge;
> > + struct clk *apb_clk;
> > + struct phy *phy;
> > +
> > + struct video_info video_info;
> > +
> > + int irq[IRQ_NUM];
> > + struct delayed_work hotplug_work;
> > + int connector_type;
> > + u32 lane_mapping;
> > +
> > + union {
> > + struct _dp_data {
> > + u32 rate;
> > + u8 num_lanes;
> > + struct drm_dp_aux aux;
> > + u8 dpcd[DP_RECEIVER_CAP_SIZE];
> > + } dp;
> > + struct _hdmi_data {
> > + u32 hdmi_type;
> > + struct cdns_hdmi_i2c *i2c;
> > + } hdmi;
> > + };
> > +};
> > +
> > +extern const struct drm_bridge_funcs cdns_dp_bridge_funcs;
> > +extern const struct drm_bridge_funcs cdns_hdmi_bridge_funcs;
> > +
> > +enum drm_connector_status
> > +cdns_mhdp8501_detect(struct cdns_mhdp8501_device *mhdp);
> > +
> > +ssize_t cdns_dp_aux_transfer(struct drm_dp_aux *aux, struct
> drm_dp_aux_msg *msg);
> > +int cdns_dp_aux_destroy(struct cdns_mhdp8501_device *mhdp);
> > +void cdns_dp_check_link_state(struct cdns_mhdp8501_device *mhdp);
> > +
> > +void cdns_hdmi_reset_link(struct cdns_mhdp8501_device *mhdp);
> > +struct i2c_adapter *cdns_hdmi_i2c_adapter(struct
> cdns_mhdp8501_device *mhdp);
> > +#endif
> > diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-dp.c
> b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-dp.c
> > new file mode 100644
> > index 0000000000000..392bb65f6c9c1
> > --- /dev/null
> > +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-dp.c
> > @@ -0,0 +1,686 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * Cadence MHDP8501 DisplayPort(DP) bridge driver
> > + *
> > + * Copyright (C) 2019-2024 NXP Semiconductor, Inc.
> > + *
> > + */
> > +#include <drm/drm_atomic_helper.h>
> > +#include <drm/drm_edid.h>
> > +#include <drm/drm_print.h>
> > +#include <linux/phy/phy.h>
> > +#include <linux/phy/phy-dp.h>
> > +
> > +#include "cdns-mhdp8501-core.h"
> > +
> > +#define LINK_TRAINING_TIMEOUT_MS 500
> > +#define LINK_TRAINING_RETRY_MS 20
> > +
> > +ssize_t cdns_dp_aux_transfer(struct drm_dp_aux *aux,
> > + struct drm_dp_aux_msg *msg)
> > +{
> > + struct cdns_mhdp8501_device *mhdp =
> dev_get_drvdata(aux->dev);
> > + bool native = msg->request & (DP_AUX_NATIVE_WRITE &
> DP_AUX_NATIVE_READ);
> > + int ret;
> > +
> > + /* Ignore address only message */
> > + if (!msg->size || !msg->buffer) {
> > + msg->reply = native ?
> > + DP_AUX_NATIVE_REPLY_ACK :
> DP_AUX_I2C_REPLY_ACK;
> > + return msg->size;
> > + }
> > +
> > + if (!native) {
> > + dev_err(mhdp->dev, "%s: only native messages
> supported\n", __func__);
> > + return -EINVAL;
> > + }
> > +
> > + /* msg sanity check */
> > + if (msg->size > DP_AUX_MAX_PAYLOAD_BYTES) {
> > + dev_err(mhdp->dev, "%s: invalid msg: size(%zu),
> request(%x)\n",
> > + __func__, msg->size, (unsigned
> int)msg->request);
> > + return -EINVAL;
> > + }
> > +
> > + if (msg->request == DP_AUX_NATIVE_WRITE) {
> > + const u8 *buf = msg->buffer;
> > + int i;
> > +
> > + for (i = 0; i < msg->size; ++i) {
> > + ret = cdns_mhdp_dpcd_write(&mhdp->base,
> > + msg->address
> + i, buf[i]);
> > + if (ret < 0) {
> > + dev_err(mhdp->dev, "Failed to write
> DPCD\n");
> > + return ret;
> > + }
> > + }
> > + msg->reply = DP_AUX_NATIVE_REPLY_ACK;
> > + return msg->size;
> > + }
> > +
> > + if (msg->request == DP_AUX_NATIVE_READ) {
> > + ret = cdns_mhdp_dpcd_read(&mhdp->base,
> msg->address,
> > + msg->buffer, msg->size);
> > + if (ret < 0)
> > + return ret;
> > + msg->reply = DP_AUX_NATIVE_REPLY_ACK;
> > + return msg->size;
> > + }
> > + return 0;
> > +}
> > +
> > +int cdns_dp_aux_destroy(struct cdns_mhdp8501_device *mhdp)
> > +{
> > + drm_dp_aux_unregister(&mhdp->dp.aux);
> > +
> > + return 0;
> > +}
> > +
> > +static int cdns_dp_get_msa_misc(struct video_info *video)
> > +{
> > + u32 msa_misc;
> > + u8 color_space = 0;
> > + u8 bpc = 0;
> > +
> > + switch (video->color_fmt) {
> > + /* set YUV default color space conversion to BT601 */
> > + case DRM_COLOR_FORMAT_YCBCR444:
> > + color_space = 6 + BT_601 * 8;
> > + break;
> > + case DRM_COLOR_FORMAT_YCBCR422:
> > + color_space = 5 + BT_601 * 8;
> > + break;
> > + case DRM_COLOR_FORMAT_YCBCR420:
> > + color_space = 5;
> > + break;
> > + case DRM_COLOR_FORMAT_RGB444:
> > + default:
> > + color_space = 0;
> > + break;
> > + };
> > +
> > + switch (video->bpc) {
> > + case 6:
> > + bpc = 0;
> > + break;
> > + case 10:
> > + bpc = 2;
> > + break;
> > + case 12:
> > + bpc = 3;
> > + break;
> > + case 16:
> > + bpc = 4;
> > + break;
> > + case 8:
> > + default:
> > + bpc = 1;
> > + break;
> > + };
> > +
> > + msa_misc = (bpc << 5) | (color_space << 1);
> > +
> > + return msa_misc;
> > +}
> > +
> > +static int cdns_dp_config_video(struct cdns_mhdp8501_device *mhdp,
> > + const struct drm_display_mode
> *mode)
> > +{
> > + struct video_info *video = &mhdp->video_info;
> > + bool h_sync_polarity, v_sync_polarity;
> > + u64 symbol;
> > + u32 val, link_rate, rem;
> > + u8 bit_per_pix, tu_size_reg = TU_SIZE;
> > + int ret;
> > +
> > + bit_per_pix = (video->color_fmt ==
> DRM_COLOR_FORMAT_YCBCR422) ?
> > + (video->bpc * 2) : (video->bpc * 3);
> > +
> > + link_rate = mhdp->dp.rate / 1000;
> > +
> > + ret = cdns_mhdp_reg_write(&mhdp->base, BND_HSYNC2VSYNC,
> VIF_BYPASS_INTERLACE);
> > + if (ret)
> > + goto err_config_video;
> > +
> > + ret = cdns_mhdp_reg_write(&mhdp->base,
> HSYNC2VSYNC_POL_CTRL, 0);
> > + if (ret)
> > + goto err_config_video;
> > +
> > + /*
> > + * get a best tu_size and valid symbol:
> > + * 1. chose Lclk freq(162Mhz, 270Mhz, 540Mhz), set TU to 32
> > + * 2. calculate VS(valid symbol) = TU * Pclk * Bpp / (Lclk * Lanes)
> > + * 3. if VS > *.85 or VS < *.1 or VS < 2 or TU < VS + 4, then set
> > + * TU += 2 and repeat 2nd step.
> > + */
> > + do {
> > + tu_size_reg += 2;
> > + symbol = tu_size_reg * mode->clock * bit_per_pix;
> > + do_div(symbol, mhdp->dp.num_lanes * link_rate * 8);
> > + rem = do_div(symbol, 1000);
> > + if (tu_size_reg > 64) {
> > + ret = -EINVAL;
> > + dev_err(mhdp->dev, "tu error, clk:%d, lanes:%d,
> rate:%d\n",
> > + mode->clock, mhdp->dp.num_lanes,
> link_rate);
> > + goto err_config_video;
> > + }
> > + } while ((symbol <= 1) || (tu_size_reg - symbol < 4) ||
> > + (rem > 850) || (rem < 100));
> > +
> > + val = symbol + (tu_size_reg << 8);
> > + val |= TU_CNT_RST_EN;
> > + ret = cdns_mhdp_reg_write(&mhdp->base, DP_FRAMER_TU, val);
> > + if (ret)
> > + goto err_config_video;
> > +
> > + /* set the FIFO Buffer size */
> > + val = div_u64(mode->clock * (symbol + 1), 1000) + link_rate;
> > + val /= (mhdp->dp.num_lanes * link_rate);
> > + val = div_u64(8 * (symbol + 1), bit_per_pix) - val;
> > + val += 2;
> > + ret = cdns_mhdp_reg_write(&mhdp->base, DP_VC_TABLE(15), val);
> > +
> > + switch (video->bpc) {
> > + case 6:
> > + val = BCS_6;
> > + break;
> > + case 10:
> > + val = BCS_10;
> > + break;
> > + case 12:
> > + val = BCS_12;
> > + break;
> > + case 16:
> > + val = BCS_16;
> > + break;
> > + case 8:
> > + default:
> > + val = BCS_8;
> > + break;
> > + };
> > +
> > + val += video->color_fmt << 8;
> > + ret = cdns_mhdp_reg_write(&mhdp->base, DP_FRAMER_PXL_REPR,
> val);
> > + if (ret)
> > + goto err_config_video;
> > +
> > + v_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NVSYNC);
> > + h_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NHSYNC);
> > +
> > + val = h_sync_polarity ? DP_FRAMER_SP_HSP : 0;
> > + val |= v_sync_polarity ? DP_FRAMER_SP_VSP : 0;
> > + ret = cdns_mhdp_reg_write(&mhdp->base, DP_FRAMER_SP, val);
> > + if (ret)
> > + goto err_config_video;
> > +
> > + val = (mode->hsync_start - mode->hdisplay) << 16;
> > + val |= mode->htotal - mode->hsync_end;
> > + ret = cdns_mhdp_reg_write(&mhdp->base,
> DP_FRONT_BACK_PORCH, val);
> > + if (ret)
> > + goto err_config_video;
> > +
> > + val = mode->hdisplay * bit_per_pix / 8;
> > + ret = cdns_mhdp_reg_write(&mhdp->base, DP_BYTE_COUNT, val);
> > + if (ret)
> > + goto err_config_video;
> > +
> > + val = mode->htotal | ((mode->htotal - mode->hsync_start) << 16);
> > + ret = cdns_mhdp_reg_write(&mhdp->base, MSA_HORIZONTAL_0,
> val);
> > + if (ret)
> > + goto err_config_video;
> > +
> > + val = mode->hsync_end - mode->hsync_start;
> > + val |= (mode->hdisplay << 16) | (h_sync_polarity << 15);
> > + ret = cdns_mhdp_reg_write(&mhdp->base, MSA_HORIZONTAL_1,
> val);
> > + if (ret)
> > + goto err_config_video;
> > +
> > + val = mode->vtotal;
> > + val |= (mode->vtotal - mode->vsync_start) << 16;
> > + ret = cdns_mhdp_reg_write(&mhdp->base, MSA_VERTICAL_0, val);
> > + if (ret)
> > + goto err_config_video;
> > +
> > + val = mode->vsync_end - mode->vsync_start;
> > + val |= (mode->vdisplay << 16) | (v_sync_polarity << 15);
> > + ret = cdns_mhdp_reg_write(&mhdp->base, MSA_VERTICAL_1, val);
> > + if (ret)
> > + goto err_config_video;
> > +
> > + val = cdns_dp_get_msa_misc(video);
> > + ret = cdns_mhdp_reg_write(&mhdp->base, MSA_MISC, val);
> > + if (ret)
> > + goto err_config_video;
> > +
> > + ret = cdns_mhdp_reg_write(&mhdp->base, STREAM_CONFIG, 1);
> > + if (ret)
> > + goto err_config_video;
> > +
> > + val = mode->hsync_end - mode->hsync_start;
> > + val |= mode->hdisplay << 16;
> > + ret = cdns_mhdp_reg_write(&mhdp->base, DP_HORIZONTAL, val);
> > + if (ret)
> > + goto err_config_video;
> > +
> > + val = mode->vdisplay;
> > + val |= (mode->vtotal - mode->vsync_start) << 16;
> > + ret = cdns_mhdp_reg_write(&mhdp->base, DP_VERTICAL_0, val);
> > + if (ret)
> > + goto err_config_video;
> > +
> > + val = mode->vtotal;
> > + ret = cdns_mhdp_reg_write(&mhdp->base, DP_VERTICAL_1, val);
> > + if (ret)
> > + goto err_config_video;
> > +
> > + ret = cdns_mhdp_dp_reg_write_bit(&mhdp->base, DP_VB_ID, 2, 1,
> 0);
> > +
> > +err_config_video:
> > + if (ret)
> > + dev_err(mhdp->dev, "config video failed: %d\n", ret);
> > + return ret;
> > +}
> > +
> > +static void cdns_dp_pixel_clk_reset(struct cdns_mhdp8501_device *mhdp)
> > +{
> > + u32 val;
> > +
> > + /* reset pixel clk */
> > + cdns_mhdp_reg_read(&mhdp->base, SOURCE_HDTX_CAR, &val);
> > + cdns_mhdp_reg_write(&mhdp->base, SOURCE_HDTX_CAR, val &
> 0xFD);
> > + cdns_mhdp_reg_write(&mhdp->base, SOURCE_HDTX_CAR, val);
> > +}
> > +
> > +static int cdns_dp_set_video_status(struct cdns_mhdp8501_device *mhdp,
> int active)
> > +{
> > + u8 msg;
> > + int ret;
> > +
> > + msg = !!active;
> > +
> > + ret = cdns_mhdp_mailbox_send(&mhdp->base,
> MB_MODULE_ID_DP_TX,
> > + DPTX_SET_VIDEO, sizeof(msg),
> &msg);
> > + if (ret)
> > + dev_err(mhdp->dev, "set video status failed: %d\n", ret);
> > +
> > + return ret;
> > +}
> > +
> > +static int cdns_dp_training_start(struct cdns_mhdp8501_device *mhdp)
> > +{
> > + unsigned long timeout;
> > + u8 msg, event[2];
> > + int ret;
> > +
> > + msg = LINK_TRAINING_RUN;
> > +
> > + /* start training */
> > + ret = cdns_mhdp_mailbox_send(&mhdp->base,
> MB_MODULE_ID_DP_TX,
> > + DPTX_TRAINING_CONTROL,
> sizeof(msg), &msg);
> > + if (ret)
> > + return ret;
> > +
> > + timeout = jiffies + msecs_to_jiffies(LINK_TRAINING_TIMEOUT_MS);
> > + while (time_before(jiffies, timeout)) {
> > + msleep(LINK_TRAINING_RETRY_MS);
> > + ret = cdns_mhdp_mailbox_send_recv(&mhdp->base,
> MB_MODULE_ID_DP_TX,
> > +
> DPTX_READ_EVENT,
> > + 0, NULL,
> sizeof(event), event);
> > + if (ret)
> > + return ret;
> > +
> > + if (event[1] & CLK_RECOVERY_FAILED)
> > + dev_err(mhdp->dev, "clock recovery failed\n");
> > + else if (event[1] & EQ_PHASE_FINISHED)
> > + return 0;
> > + }
> > +
> > + return -ETIMEDOUT;
> > +}
> > +
> > +static int cdns_dp_get_training_status(struct cdns_mhdp8501_device
> *mhdp)
> > +{
> > + u8 status[13];
> > + int ret;
> > +
> > + ret = cdns_mhdp_mailbox_send_recv(&mhdp->base,
> MB_MODULE_ID_DP_TX,
> > + DPTX_READ_LINK_STAT,
> > + 0, NULL, sizeof(status),
> status);
> > + if (ret)
> > + return ret;
> > +
> > + mhdp->dp.rate = drm_dp_bw_code_to_link_rate(status[0]);
> > + mhdp->dp.num_lanes = status[1];
> > +
> > + return ret;
> > +}
> > +
> > +static int cdns_dp_train_link(struct cdns_mhdp8501_device *mhdp)
> > +{
> > + int ret;
> > +
> > + ret = cdns_dp_training_start(mhdp);
> > + if (ret) {
> > + dev_err(mhdp->dev, "Failed to start training %d\n", ret);
> > + return ret;
> > + }
> > +
> > + ret = cdns_dp_get_training_status(mhdp);
> > + if (ret) {
> > + dev_err(mhdp->dev, "Failed to get training stat %d\n",
> ret);
> > + return ret;
> > + }
> > +
> > + dev_dbg(mhdp->dev, "rate:0x%x, lanes:%d\n", mhdp->dp.rate,
> > + mhdp->dp.num_lanes);
> > + return ret;
> > +}
> > +
> > +static int cdns_dp_set_host_cap(struct cdns_mhdp8501_device *mhdp)
> > +{
> > + u8 msg[8];
> > + int ret;
> > +
> > + msg[0] = drm_dp_link_rate_to_bw_code(mhdp->dp.rate);
> > + msg[1] = mhdp->dp.num_lanes | SCRAMBLER_EN;
> > + msg[2] = VOLTAGE_LEVEL_2;
> > + msg[3] = PRE_EMPHASIS_LEVEL_3;
> > + msg[4] = PTS1 | PTS2 | PTS3 | PTS4;
> > + msg[5] = FAST_LT_NOT_SUPPORT;
> > + msg[6] = mhdp->lane_mapping;
> > + msg[7] = ENHANCED;
> > +
> > + ret = cdns_mhdp_mailbox_send(&mhdp->base,
> MB_MODULE_ID_DP_TX,
> > + DPTX_SET_HOST_CAPABILITIES,
> > + sizeof(msg), msg);
> > + if (ret)
> > + dev_err(mhdp->dev, "set host cap failed: %d\n", ret);
> > +
> > + return ret;
> > +}
> > +
> > +static int cdns_dp_get_edid_block(void *data, u8 *edid,
> > + unsigned int block, size_t length)
> > +{
> > + struct cdns_mhdp8501_device *mhdp = data;
> > + u8 msg[2], reg[2], i;
> > + int ret;
> > +
> > + for (i = 0; i < 4; i++) {
> > + msg[0] = block / 2;
> > + msg[1] = block % 2;
> > +
> > + ret =
> cdns_mhdp_mailbox_send_recv_multi(&mhdp->base,
> > +
> MB_MODULE_ID_DP_TX,
> > +
> DPTX_GET_EDID,
> > +
> sizeof(msg), msg,
> > +
> DPTX_GET_EDID,
> > +
> sizeof(reg), reg,
> > + length,
> edid);
> > + if (ret)
> > + continue;
> > +
> > + if (reg[0] == length && reg[1] == block / 2)
> > + break;
> > + }
> > +
> > + if (ret)
> > + dev_err(mhdp->dev, "get block[%d] edid failed: %d\n",
> > + block, ret);
> > +
> > + return ret;
> > +}
> > +
> > +static void cdns_dp_mode_set(struct cdns_mhdp8501_device *mhdp,
> > + const struct drm_display_mode *mode)
> > +{
> > + union phy_configure_opts phy_cfg;
> > + int ret;
> > +
> > + cdns_dp_pixel_clk_reset(mhdp);
> > +
> > + /* Get DP Caps */
> > + ret = drm_dp_dpcd_read(&mhdp->dp.aux, DP_DPCD_REV,
> mhdp->dp.dpcd,
> > + DP_RECEIVER_CAP_SIZE);
> > + if (ret < 0) {
> > + dev_err(mhdp->dev, "Failed to get caps %d\n", ret);
> > + return;
> > + }
> > +
> > + mhdp->dp.rate = drm_dp_max_link_rate(mhdp->dp.dpcd);
> > + mhdp->dp.num_lanes = drm_dp_max_lane_count(mhdp->dp.dpcd);
> > +
> > + /* check the max link rate */
> > + if (mhdp->dp.rate > CDNS_DP_MAX_LINK_RATE)
> > + mhdp->dp.rate = CDNS_DP_MAX_LINK_RATE;
> > +
> > + phy_cfg.dp.lanes = mhdp->dp.num_lanes;
> > + phy_cfg.dp.link_rate = mhdp->dp.rate;
> > + phy_cfg.dp.set_lanes = false;
> > + phy_cfg.dp.set_rate = false;
> > + phy_cfg.dp.set_voltages = false;
> > +
> > + ret = phy_configure(mhdp->phy, &phy_cfg);
> > + if (ret) {
> > + dev_err(mhdp->dev, "%s: phy_configure() failed: %d\n",
> > + __func__, ret);
> > + return;
> > + }
> > +
> > + /* Video off */
> > + ret = cdns_dp_set_video_status(mhdp, CONTROL_VIDEO_IDLE);
> > + if (ret) {
> > + dev_err(mhdp->dev, "Failed to valid video %d\n", ret);
> > + return;
> > + }
> > +
> > + /* Line swapping */
> > + cdns_mhdp_reg_write(&mhdp->base, LANES_CONFIG, 0x00400000
> | mhdp->lane_mapping);
> > +
> > + /* Set DP host capability */
> > + ret = cdns_dp_set_host_cap(mhdp);
> > + if (ret) {
> > + dev_err(mhdp->dev, "Failed to set host cap %d\n", ret);
> > + return;
> > + }
> > +
> > + ret = cdns_mhdp_reg_write(&mhdp->base,
> DP_AUX_SWAP_INVERSION_CONTROL,
> > + AUX_HOST_INVERT);
> > + if (ret) {
> > + dev_err(mhdp->dev, "Failed to set host invert %d\n", ret);
> > + return;
> > + }
> > +
> > + ret = cdns_dp_config_video(mhdp, mode);
> > + if (ret)
> > + dev_err(mhdp->dev, "Failed to config video %d\n", ret);
> > +}
> > +
> > +static bool
> > +cdns_dp_needs_link_retrain(struct cdns_mhdp8501_device *mhdp)
> > +{
> > + u8 link_status[DP_LINK_STATUS_SIZE];
> > +
> > + if (drm_dp_dpcd_read_phy_link_status(&mhdp->dp.aux,
> DP_PHY_DPRX,
> > + link_status) < 0)
> > + return false;
> > +
> > + /* Retrain if link not ok */
> > + return !drm_dp_channel_eq_ok(link_status, mhdp->dp.num_lanes);
> > +}
> > +
> > +void cdns_dp_check_link_state(struct cdns_mhdp8501_device *mhdp)
> > +{
> > + struct drm_connector *connector = mhdp->curr_conn;
> > + const struct drm_edid *drm_edid;
> > + struct drm_connector_state *conn_state;
> > + struct drm_crtc_state *crtc_state;
> > + struct drm_crtc *crtc;
> > +
> > + if (!connector)
> > + return;
> > +
> > + drm_edid = drm_edid_read_custom(connector,
> cdns_dp_get_edid_block, mhdp);
> > + drm_edid_connector_update(connector, drm_edid);
>
> It would be nice to have a comment, why do you need to re-read EDID at
> this point.
OK, I will.
>
> > +
> > + if (!drm_edid)
> > + return;
> > +
> > + drm_edid_free(drm_edid);
> > +
> > + conn_state = connector->state;
> > + crtc = conn_state->crtc;
> > + if (!crtc)
> > + return;
> > +
> > + crtc_state = crtc->state;
> > + if (!crtc_state->active)
> > + return;
> > +
> > + if (!cdns_dp_needs_link_retrain(mhdp))
> > + return;
> > +
> > + /* DP link retrain */
> > + if (cdns_dp_train_link(mhdp))
> > + dev_err(mhdp->dev, "Failed link train\n");
> > +}
> > +
> > +static int cdns_dp_bridge_attach(struct drm_bridge *bridge,
> > + enum drm_bridge_attach_flags flags)
> > +{
> > + struct cdns_mhdp8501_device *mhdp = bridge->driver_private;
> > +
> > + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
> > + dev_err(mhdp->dev, "do not support creating a
> drm_connector\n");
> > + return -EINVAL;
> > + }
> > +
> > + mhdp->dp.aux.drm_dev = bridge->dev;
> > +
> > + return drm_dp_aux_register(&mhdp->dp.aux);
> > +}
> > +
> > +static enum drm_mode_status
> > +cdns_dp_bridge_mode_valid(struct drm_bridge *bridge,
> > + const struct drm_display_info *info,
> > + const struct drm_display_mode *mode)
> > +{
> > + enum drm_mode_status mode_status = MODE_OK;
> > +
> > + /* We don't support double-clocked modes */
> > + if (mode->flags & DRM_MODE_FLAG_DBLCLK ||
> > + mode->flags & DRM_MODE_FLAG_INTERLACE)
>
> This should be handled by a generic code as you don't set interlace_allowed.
OK. DRM_MODE_FLAG_INTERLACE will be removed.
>
> > + return MODE_BAD;
> > +
> > + /* MAX support pixel clock rate 594MHz */
> > + if (mode->clock > 594000)
> > + return MODE_CLOCK_HIGH;
> > +
> > + if (mode->hdisplay > 3840)
> > + return MODE_BAD_HVALUE;
> > +
> > + if (mode->vdisplay > 2160)
> > + return MODE_BAD_VVALUE;
> > +
> > + return mode_status;
> > +}
> > +
> > +static enum drm_connector_status
> > +cdns_dp_bridge_detect(struct drm_bridge *bridge)
> > +{
> > + struct cdns_mhdp8501_device *mhdp = bridge->driver_private;
> > +
> > + return cdns_mhdp8501_detect(mhdp);
>
> Please use the function directly instead of defining single-line
> wrappers.
OK.
>
> > +}
> > +
> > +static const struct drm_edid
> > +*cdns_dp_bridge_edid_read(struct drm_bridge *bridge,
> > + struct drm_connector *connector)
> > +{
> > + struct cdns_mhdp8501_device *mhdp = bridge->driver_private;
> > +
> > + return drm_edid_read_custom(connector, cdns_dp_get_edid_block,
> mhdp);
> > +}
> > +
> > +static void cdns_dp_bridge_atomic_disable(struct drm_bridge *bridge,
> > + struct drm_bridge_state
> *old_state)
> > +{
> > + struct cdns_mhdp8501_device *mhdp = bridge->driver_private;
> > +
> > + cdns_dp_set_video_status(mhdp, CONTROL_VIDEO_IDLE);
> > + mhdp->curr_conn = NULL;
> > +
> > + phy_power_off(mhdp->phy);
> > +}
> > +
> > +static void cdns_dp_bridge_atomic_enable(struct drm_bridge *bridge,
> > + struct drm_bridge_state
> *old_state)
> > +{
> > + struct cdns_mhdp8501_device *mhdp = bridge->driver_private;
> > + struct drm_atomic_state *state = old_state->base.state;
> > + struct drm_connector *connector;
> > + struct video_info *video = &mhdp->video_info;
> > + struct drm_crtc_state *crtc_state;
> > + struct drm_connector_state *conn_state;
> > + int ret;
> > +
> > + connector = drm_atomic_get_new_connector_for_encoder(state,
> > +
> bridge->encoder);
> > + if (WARN_ON(!connector))
> > + return;
> > +
> > + mhdp->curr_conn = connector;
> > +
> > + conn_state = drm_atomic_get_new_connector_state(state,
> connector);
> > + if (WARN_ON(!conn_state))
> > + return;
> > +
> > + crtc_state = drm_atomic_get_new_crtc_state(state,
> conn_state->crtc);
> > + if (WARN_ON(!crtc_state))
> > + return;
> > +
> > + switch (connector->display_info.bpc) {
> > + case 10:
> > + video->bpc = 10;
> > + break;
> > + case 6:
> > + video->bpc = 6;
> > + break;
> > + default:
> > + video->bpc = 8;
> > + break;
> > + }
>
> Please update the state instead during atomic_check() and use the value
> from the atomic_state.
OK.
>
> > +
> > + /* The only currently supported format */
> > + video->color_fmt = DRM_COLOR_FORMAT_RGB444;
>
> If it's the only supported format, then there is no need to store it.
OK. I will check the code to see if there's a more better way to do it.
>
> > +
> > + cdns_dp_mode_set(mhdp, &crtc_state->adjusted_mode);
> > +
> > + /* Power up PHY before link training */
> > + phy_power_on(mhdp->phy);
> > +
> > + /* Link training */
> > + ret = cdns_dp_train_link(mhdp);
> > + if (ret) {
> > + dev_err(mhdp->dev, "Failed link train %d\n", ret);
> > + return;
> > + }
> > +
> > + ret = cdns_dp_set_video_status(mhdp, CONTROL_VIDEO_VALID);
> > + if (ret) {
> > + dev_err(mhdp->dev, "Failed to valid video %d\n", ret);
> > + return;
> > + }
> > +}
> > +
> > +const struct drm_bridge_funcs cdns_dp_bridge_funcs = {
> > + .attach = cdns_dp_bridge_attach,
> > + .detect = cdns_dp_bridge_detect,
> > + .edid_read = cdns_dp_bridge_edid_read,
> > + .mode_valid = cdns_dp_bridge_mode_valid,
> > + .atomic_enable = cdns_dp_bridge_atomic_enable,
> > + .atomic_disable = cdns_dp_bridge_atomic_disable,
> > + .atomic_duplicate_state =
> drm_atomic_helper_bridge_duplicate_state,
> > + .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
> > + .atomic_reset = drm_atomic_helper_bridge_reset,
> > +};
> > diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-hdmi.c
> b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-hdmi.c
> > new file mode 100644
> > index 0000000000000..f7cafc153a58e
> > --- /dev/null
> > +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-hdmi.c
> > @@ -0,0 +1,764 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * Cadence MHDP8501 HDMI bridge driver
> > + *
> > + * Copyright (C) 2019-2024 NXP Semiconductor, Inc.
> > + *
> > + */
> > +#include <drm/display/drm_hdmi_helper.h>
> > +#include <drm/display/drm_hdmi_state_helper.h>
> > +#include <drm/display/drm_scdc_helper.h>
> > +#include <drm/drm_atomic_helper.h>
> > +#include <drm/drm_edid.h>
> > +#include <drm/drm_print.h>
> > +#include <linux/phy/phy.h>
> > +#include <linux/phy/phy-hdmi.h>
> > +
> > +#include "cdns-mhdp8501-core.h"
> > +
> > +/**
> > + * cdns_hdmi_config_infoframe() - fill the HDMI infoframe
> > + * @mhdp: phandle to mhdp device.
> > + * @entry_id: The packet memory address in which the data is written.
> > + * @len: length of infoframe.
> > + * @buf: point to InfoFrame Packet.
> > + * @type: Packet Type of InfoFrame in HDMI Specification.
> > + *
> > + */
> > +
> > +static void cdns_hdmi_clear_infoframe(struct cdns_mhdp8501_device
> *mhdp,
> > + u8 entry_id, u8 type)
> > +{
> > + u32 val;
> > +
> > + /* invalidate entry */
> > + val = F_ACTIVE_IDLE_TYPE(1) | F_PKT_ALLOC_ADDRESS(entry_id) |
> > + F_PACKET_TYPE(type);
> > + writel(val, mhdp->regs + SOURCE_PIF_PKT_ALLOC_REG);
> > + writel(F_PKT_ALLOC_WR_EN(1), mhdp->regs +
> SOURCE_PIF_PKT_ALLOC_WR_EN);
> > +}
> > +
> > +static void cdns_hdmi_config_infoframe(struct cdns_mhdp8501_device
> *mhdp,
> > + u8 entry_id, u8 len,
> > + const u8 *buf, u8 type)
> > +{
> > + u8 packet[32], packet_len = 32;
> > + u32 packet32, len32;
> > + u32 val, i;
> > +
> > + /*
> > + * only support 32 bytes now
> > + * packet[0] = 0
> > + * packet[1-3] = HB[0-2] InfoFrame Packet Header
> > + * packet[4-31 = PB[0-27] InfoFrame Packet Contents
> > + */
> > + if (len >= (packet_len - 1))
> > + return;
> > + packet[0] = 0;
> > + memcpy(packet + 1, buf, len);
> > +
> > + cdns_hdmi_clear_infoframe(mhdp, entry_id, type);
> > +
> > + /* flush fifo 1 */
> > + writel(F_FIFO1_FLUSH(1), mhdp->regs +
> SOURCE_PIF_FIFO1_FLUSH);
> > +
> > + /* write packet into memory */
> > + len32 = packet_len / 4;
> > + for (i = 0; i < len32; i++) {
> > + packet32 = get_unaligned_le32(packet + 4 * i);
> > + writel(F_DATA_WR(packet32), mhdp->regs +
> SOURCE_PIF_DATA_WR);
> > + }
> > +
> > + /* write entry id */
> > + writel(F_WR_ADDR(entry_id), mhdp->regs +
> SOURCE_PIF_WR_ADDR);
> > +
> > + /* write request */
> > + writel(F_HOST_WR(1), mhdp->regs + SOURCE_PIF_WR_REQ);
> > +
> > + /* update entry */
> > + val = F_ACTIVE_IDLE_TYPE(1) | F_TYPE_VALID(1) |
> > + F_PACKET_TYPE(type) | F_PKT_ALLOC_ADDRESS(entry_id);
> > + writel(val, mhdp->regs + SOURCE_PIF_PKT_ALLOC_REG);
> > +
> > + writel(F_PKT_ALLOC_WR_EN(1), mhdp->regs +
> SOURCE_PIF_PKT_ALLOC_WR_EN);
> > +}
> > +
> > +static int cdns_hdmi_get_edid_block(void *data, u8 *edid,
> > + u32 block, size_t length)
> > +{
> > + struct cdns_mhdp8501_device *mhdp = data;
> > + u8 msg[2], reg[5], i;
> > + int ret;
> > +
> > + for (i = 0; i < 4; i++) {
> > + msg[0] = block / 2;
> > + msg[1] = block % 2;
> > +
> > + ret =
> cdns_mhdp_mailbox_send_recv_multi(&mhdp->base,
> > +
> MB_MODULE_ID_HDMI_TX,
> > +
> HDMI_TX_EDID,
> > +
> sizeof(msg), msg,
> > +
> HDMI_TX_EDID,
> > +
> sizeof(reg), reg,
> > + length,
> edid);
> > +
> > + if (ret)
> > + continue;
> > +
> > + if ((reg[3] << 8 | reg[4]) == length)
> > + break;
> > + }
> > +
> > + if (ret)
> > + dev_err(mhdp->dev, "get block[%d] edid failed: %d\n",
> block, ret);
> > + return ret;
> > +}
> > +
> > +static int cdns_hdmi_set_hdmi_mode_type(struct cdns_mhdp8501_device
> *mhdp)
> > +{
> > + struct drm_connector_state *conn_state = mhdp->curr_conn->state;
> > + u32 protocol = mhdp->hdmi.hdmi_type;
> > + u32 val;
> > +
> > + if (protocol == MODE_HDMI_2_0 &&
> > + conn_state->hdmi.tmds_char_rate >= 340000000) {
> > + cdns_mhdp_reg_write(&mhdp->base,
> HDTX_CLOCK_REG_0, 0);
> > + cdns_mhdp_reg_write(&mhdp->base,
> HDTX_CLOCK_REG_1, 0xFFFFF);
> > + }
> > +
> > + cdns_mhdp_reg_read(&mhdp->base, HDTX_CONTROLLER, &val);
> > +
> > + /* set HDMI mode and preemble mode data enable */
> > + val |= F_HDMI_MODE(protocol) | F_HDMI2_PREAMBLE_EN(1) |
> > + F_HDMI2_CTRL_IL_MODE(1);
> > + return cdns_mhdp_reg_write(&mhdp->base, HDTX_CONTROLLER,
> val);
> > +}
> > +
> > +static int cdns_hdmi_ctrl_init(struct cdns_mhdp8501_device *mhdp)
> > +{
> > + u32 val;
> > + int ret;
> > +
> > + /* Set PHY to HDMI data */
> > + ret = cdns_mhdp_reg_write(&mhdp->base, PHY_DATA_SEL,
> F_SOURCE_PHY_MHDP_SEL(1));
> > + if (ret < 0)
> > + return ret;
> > +
> > + ret = cdns_mhdp_reg_write(&mhdp->base, HDTX_HPD,
> > + F_HPD_VALID_WIDTH(4) |
> F_HPD_GLITCH_WIDTH(0));
> > + if (ret < 0)
> > + return ret;
> > +
> > + /* open CARS */
> > + ret = cdns_mhdp_reg_write(&mhdp->base, SOURCE_PHY_CAR,
> 0xF);
> > + if (ret < 0)
> > + return ret;
> > + ret = cdns_mhdp_reg_write(&mhdp->base, SOURCE_HDTX_CAR,
> 0xFF);
> > + if (ret < 0)
> > + return ret;
> > + ret = cdns_mhdp_reg_write(&mhdp->base, SOURCE_PKT_CAR, 0xF);
> > + if (ret < 0)
> > + return ret;
> > + ret = cdns_mhdp_reg_write(&mhdp->base, SOURCE_AIF_CAR, 0xF);
> > + if (ret < 0)
> > + return ret;
> > + ret = cdns_mhdp_reg_write(&mhdp->base, SOURCE_CIPHER_CAR,
> 0xF);
> > + if (ret < 0)
> > + return ret;
> > + ret = cdns_mhdp_reg_write(&mhdp->base, SOURCE_CRYPTO_CAR,
> 0xF);
> > + if (ret < 0)
> > + return ret;
> > + ret = cdns_mhdp_reg_write(&mhdp->base, SOURCE_CEC_CAR, 3);
> > + if (ret < 0)
> > + return ret;
> > +
> > + ret = cdns_mhdp_reg_write(&mhdp->base, HDTX_CLOCK_REG_0,
> 0x7c1f);
> > + if (ret < 0)
> > + return ret;
> > + ret = cdns_mhdp_reg_write(&mhdp->base, HDTX_CLOCK_REG_1,
> 0x7c1f);
> > + if (ret < 0)
> > + return ret;
> > +
> > + /* init HDMI Controller */
> > + val = F_BCH_EN(1) | F_PIC_3D(0xF) | F_CLEAR_AVMUTE(1);
> > + ret = cdns_mhdp_reg_write(&mhdp->base, HDTX_CONTROLLER,
> val);
> > + if (ret < 0)
> > + return ret;
> > +
> > + return cdns_hdmi_set_hdmi_mode_type(mhdp);
> > +}
> > +
> > +static int cdns_hdmi_mode_config(struct cdns_mhdp8501_device *mhdp,
> > + struct drm_display_mode *mode,
> > + struct drm_connector_hdmi_state
> *hdmi)
> > +{
> > + u32 vsync_lines = mode->vsync_end - mode->vsync_start;
> > + u32 eof_lines = mode->vsync_start - mode->vdisplay;
> > + u32 sof_lines = mode->vtotal - mode->vsync_end;
> > + u32 hblank = mode->htotal - mode->hdisplay;
> > + u32 hactive = mode->hdisplay;
> > + u32 vblank = mode->vtotal - mode->vdisplay;
> > + u32 vactive = mode->vdisplay;
> > + u32 hfront = mode->hsync_start - mode->hdisplay;
> > + u32 hback = mode->htotal - mode->hsync_end;
> > + u32 vfront = eof_lines;
> > + u32 hsync = hblank - hfront - hback;
> > + u32 vsync = vsync_lines;
> > + u32 vback = sof_lines;
> > + u32 v_h_polarity = ((mode->flags & DRM_MODE_FLAG_NHSYNC) ?
> 0 : 1) +
> > + ((mode->flags &
> DRM_MODE_FLAG_NVSYNC) ? 0 : 2);
> > + int ret;
> > + u32 val;
> > +
> > + ret = cdns_mhdp_reg_write(&mhdp->base, SCHEDULER_H_SIZE,
> (hactive << 16) + hblank);
> > + if (ret < 0)
> > + return ret;
> > +
> > + ret = cdns_mhdp_reg_write(&mhdp->base, SCHEDULER_V_SIZE,
> (vactive << 16) + vblank);
> > + if (ret < 0)
> > + return ret;
> > +
> > + ret = cdns_mhdp_reg_write(&mhdp->base,
> HDTX_SIGNAL_FRONT_WIDTH, (vfront << 16) + hfront);
> > + if (ret < 0)
> > + return ret;
> > +
> > + ret = cdns_mhdp_reg_write(&mhdp->base,
> HDTX_SIGNAL_SYNC_WIDTH, (vsync << 16) + hsync);
> > + if (ret < 0)
> > + return ret;
> > +
> > + ret = cdns_mhdp_reg_write(&mhdp->base,
> HDTX_SIGNAL_BACK_WIDTH, (vback << 16) + hback);
> > + if (ret < 0)
> > + return ret;
> > +
> > + ret = cdns_mhdp_reg_write(&mhdp->base,
> HSYNC2VSYNC_POL_CTRL, v_h_polarity);
> > + if (ret < 0)
> > + return ret;
> > +
> > + /* Reset Data Enable */
> > + cdns_mhdp_reg_read(&mhdp->base, HDTX_CONTROLLER, &val);
> > + val &= ~F_DATA_EN(1);
> > + ret = cdns_mhdp_reg_write(&mhdp->base, HDTX_CONTROLLER,
> val);
> > + if (ret < 0)
> > + return ret;
> > +
> > + /* Set bpc */
> > + val &= ~F_VIF_DATA_WIDTH(3);
> > + switch (hdmi->output_bpc) {
> > + case 10:
> > + val |= F_VIF_DATA_WIDTH(1);
> > + break;
> > + case 12:
> > + val |= F_VIF_DATA_WIDTH(2);
> > + break;
> > + case 16:
> > + val |= F_VIF_DATA_WIDTH(3);
> > + break;
> > + case 8:
> > + default:
> > + val |= F_VIF_DATA_WIDTH(0);
> > + break;
> > + }
> > +
> > + /* select color encoding */
> > + val &= ~F_HDMI_ENCODING(3);
> > + switch (hdmi->output_format) {
> > + case HDMI_COLORSPACE_YUV444:
> > + val |= F_HDMI_ENCODING(2);
> > + break;
> > + case HDMI_COLORSPACE_YUV422:
> > + val |= F_HDMI_ENCODING(1);
> > + break;
> > + case HDMI_COLORSPACE_YUV420:
> > + val |= F_HDMI_ENCODING(3);
> > + break;
> > + case HDMI_COLORSPACE_RGB:
> > + default:
> > + val |= F_HDMI_ENCODING(0);
> > + break;
> > + }
> > +
> > + ret = cdns_mhdp_reg_write(&mhdp->base, HDTX_CONTROLLER,
> val);
> > + if (ret < 0)
> > + return ret;
> > +
> > + /* set data enable */
> > + val |= F_DATA_EN(1);
> > + return cdns_mhdp_reg_write(&mhdp->base, HDTX_CONTROLLER,
> val);
> > +}
> > +
> > +static int cdns_hdmi_disable_gcp(struct cdns_mhdp8501_device *mhdp)
> > +{
> > + u32 val;
> > +
> > + cdns_mhdp_reg_read(&mhdp->base, HDTX_CONTROLLER, &val);
> > + val &= ~F_GCP_EN(1);
> > +
> > + return cdns_mhdp_reg_write(&mhdp->base, HDTX_CONTROLLER,
> val);
> > +}
> > +
> > +static int cdns_hdmi_enable_gcp(struct cdns_mhdp8501_device *mhdp)
> > +{
> > + u32 val;
> > +
> > + cdns_mhdp_reg_read(&mhdp->base, HDTX_CONTROLLER, &val);
> > + val |= F_GCP_EN(1);
> > +
> > + return cdns_mhdp_reg_write(&mhdp->base, HDTX_CONTROLLER,
> val);
> > +}
> > +
> > +#define HDMI_14_MAX_TMDS_CLK (340 * 1000 * 1000)
> > +static void cdns_hdmi_sink_config(struct cdns_mhdp8501_device *mhdp,
> > + unsigned long long tmds_char_rate)
> > +{
> > + struct drm_connector *connector = mhdp->curr_conn;
> > + struct drm_display_info *display = &connector->display_info;
> > + struct drm_scdc *scdc = &display->hdmi.scdc;
> > + bool hdmi_scrambling = false;
> > + bool hdmi_high_tmds_clock_ratio = false;
> > +
> > + /* check sink type (HDMI or DVI) */
> > + if (!display->is_hdmi) {
> > + mhdp->hdmi.hdmi_type = MODE_DVI;
> > + return;
> > + }
> > +
> > + /* Default work in HDMI1.4 */
> > + mhdp->hdmi.hdmi_type = MODE_HDMI_1_4;
> > +
> > + /* check sink support SCDC or not */
> > + if (!scdc->supported) {
> > + dev_dbg(mhdp->dev, "Sink Not Support SCDC\n");
> > + return;
> > + }
> > +
> > + if (tmds_char_rate > HDMI_14_MAX_TMDS_CLK) {
> > + hdmi_scrambling = true;
> > + hdmi_high_tmds_clock_ratio = true;
> > + mhdp->hdmi.hdmi_type = MODE_HDMI_2_0;
> > + } else if (scdc->scrambling.low_rates) {
> > + hdmi_scrambling = true;
> > + mhdp->hdmi.hdmi_type = MODE_HDMI_2_0;
> > + }
> > +
> > + /* Set TMDS bit clock ratio to 1/40 or 1/10, and enable/disable
> scrambling */
> > + drm_scdc_set_high_tmds_clock_ratio(connector,
> hdmi_high_tmds_clock_ratio);
> > + drm_scdc_set_scrambling(connector, hdmi_scrambling);
> > +}
> > +
> > +static int cdns_hdmi_bridge_attach(struct drm_bridge *bridge,
> > + enum drm_bridge_attach_flags
> flags)
> > +{
> > + struct cdns_mhdp8501_device *mhdp = bridge->driver_private;
> > +
> > + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
> > + dev_err(mhdp->dev, "do not support creating a
> drm_connector\n");
> > + return -EINVAL;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int reset_pipe(struct drm_crtc *crtc)
> > +{
> > + struct drm_atomic_state *state;
> > + struct drm_crtc_state *crtc_state;
> > + struct drm_modeset_acquire_ctx ctx;
> > + int ret;
> > +
> > + state = drm_atomic_state_alloc(crtc->dev);
> > + if (!state)
> > + return -ENOMEM;
> > +
> > + drm_modeset_acquire_init(&ctx, 0);
> > +
> > + state->acquire_ctx = &ctx;
> > +
> > + crtc_state = drm_atomic_get_crtc_state(state, crtc);
> > + if (IS_ERR(crtc_state)) {
> > + ret = PTR_ERR(crtc_state);
> > + goto out;
> > + }
> > +
> > + crtc_state->connectors_changed = true;
> > +
> > + ret = drm_atomic_commit(state);
>
> I'd say, this looks like a hack to me.
Basically, those code followed the sequence as vc4 HDMI and i915 according review comments in v15.
HDMI driver should " Reenabling the scrambler when a display is disconnected and reconnected".
To be honest, I'm not 100% convinced by this implementation,
as the code doesn't seem to align perfectly with the current DRM framework.
However, adding this feature would indeed address the issue of applications (like modetest) that don't handle HPD events
but still require cable plug/unplug support when operating in scrambler-enabled video modes.
>
> > +out:
> > + drm_atomic_state_put(state);
> > + drm_modeset_drop_locks(&ctx);
> > + drm_modeset_acquire_fini(&ctx);
> > +
> > + return ret;
> > +}
> > +
> > +void cdns_hdmi_reset_link(struct cdns_mhdp8501_device *mhdp)
> > +{
> > + struct drm_connector *connector = mhdp->curr_conn;
> > + const struct drm_edid *drm_edid;
> > + struct drm_connector_state *conn_state;
> > + struct drm_crtc_state *crtc_state;
> > + struct drm_crtc *crtc;
> > +
> > + if (!connector)
> > + return;
> > +
> > + drm_edid = drm_edid_read_custom(connector,
> cdns_hdmi_get_edid_block, mhdp);
> > + drm_edid_connector_update(connector, drm_edid);
>
> Why?
MHDP8501 HDMI support scrambling.low_rates.
The scrambler status can change when switching HDMI display monitors, even if the video mode stays the same.
The MHDP8501's HDMI code updates the EDID data to accommodate displays with different scrambler capabilities.
>
> > +
> > + if (!drm_edid)
> > + return;
> > +
> > + drm_edid_free(drm_edid);
> > +
> > + conn_state = connector->state;
> > + crtc = conn_state->crtc;
> > + if (!crtc)
> > + return;
> > +
> > + crtc_state = crtc->state;
> > + if (!crtc_state->active)
> > + return;
> > +
> > + /*
> > + * HDMI 2.0 says that one should not send scrambled data
> > + * prior to configuring the sink scrambling, and that
> > + * TMDS clock/data transmission should be suspended when
> > + * changing the TMDS clock rate in the sink. So let's
> > + * just do a full modeset here, even though some sinks
> > + * would be perfectly happy if were to just reconfigure
> > + * the SCDC settings on the fly.
> > + */
> > + reset_pipe(crtc);
>
> We are not supposed to cause full-modeset flicker if we can avoid it. Is
> it the case here?
My implementation differs slightly from the VC4 HDMI in that it doesn't check if the current video mode requires enabling the scrambler.
This is because we considered a scenario where the previous display was operating at 1080p60 with scrambling enabled,
and then the cable was plugged into a display that doesn't support scrambling at low rates.
This case also necessitates a full modeset.
I haven't found any video flickering issues in my actual tests.
>
> > +}
> > +
> > +static int cdns_hdmi_i2c_write(struct cdns_mhdp8501_device *mhdp,
> > + struct i2c_msg *msgs)
> > +{
> > + u8 msg[5], reg[5];
> > + int ret;
> > +
> > + msg[0] = msgs->addr;
> > + msg[1] = msgs->buf[0];
> > + msg[2] = 0;
> > + msg[3] = 1;
> > + msg[4] = msgs->buf[1];
> > +
> > + ret = cdns_mhdp_mailbox_send_recv(&mhdp->base,
> > +
> MB_MODULE_ID_HDMI_TX, HDMI_TX_WRITE,
> > + sizeof(msg), msg,
> sizeof(reg), reg);
> > + if (ret) {
> > + dev_err(mhdp->dev, "I2C write failed: %d\n", ret);
> > + return ret;
> > + }
> > +
> > + if (reg[0] != 0)
> > + return -EINVAL;
> > +
> > + return 0;
> > +}
> > +
> > +static int cdns_hdmi_i2c_read(struct cdns_mhdp8501_device *mhdp,
> > + struct i2c_msg *msgs, int num)
> > +{
> > + u8 msg[4], reg[5];
> > + u8 addr, offset, *buf, len;
> > + int ret, i;
> > +
> > + for (i = 0; i < num; i++) {
> > + if (msgs[i].flags & I2C_M_RD) {
> > + addr = msgs[i].addr;
> > + buf = msgs[i].buf;
> > + len = msgs[i].len;
> > + } else {
> > + offset = msgs[i].buf[0];
> > + }
> > + }
> > +
> > + msg[0] = addr;
> > + msg[1] = offset;
> > + put_unaligned_be16(len, msg + 2);
> > +
> > + ret = cdns_mhdp_mailbox_send_recv_multi(&mhdp->base,
> > +
> MB_MODULE_ID_HDMI_TX, HDMI_TX_READ,
> > + sizeof(msg), msg,
> > + HDMI_TX_READ,
> > + sizeof(reg), reg,
> > + len, buf);
> > + if (ret) {
> > + dev_err(mhdp->dev, "I2c Read failed: %d\n", ret);
> > + return ret;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +#define SCDC_I2C_SLAVE_ADDRESS 0x54
> > +static int cdns_hdmi_i2c_xfer(struct i2c_adapter *adap,
> > + struct i2c_msg *msgs, int num)
> > +{
> > + struct cdns_mhdp8501_device *mhdp = i2c_get_adapdata(adap);
> > + struct cdns_hdmi_i2c *i2c = mhdp->hdmi.i2c;
> > + int i, ret = 0;
> > +
> > + /* Only support SCDC I2C Read/Write */
> > + for (i = 0; i < num; i++) {
> > + if (msgs[i].addr != SCDC_I2C_SLAVE_ADDRESS) {
> > + dev_err(mhdp->dev, "ADDR=%0x is not
> supported\n", msgs[i].addr);
> > + return -EINVAL;
>
> Why?
MHDP FW offers mailbox APIs for SCDC register access but no direct I2C APIs.
Individual I2C registers can be read/written using HDMI general register APIs,
but block reads (e.g., EDID) are not supported, so it is not a full function I2C.
i2c_adapter was implemented only for reuse drm_scdc_XXX functions.
>
> > + }
> > + }
> > +
> > + mutex_lock(&i2c->lock);
> > +
> > + if (num == 1)
> > + ret = cdns_hdmi_i2c_write(mhdp, msgs);
> > + else
> > + ret = cdns_hdmi_i2c_read(mhdp, msgs, num);
> > +
> > + if (!ret)
> > + ret = num;
> > +
> > + mutex_unlock(&i2c->lock);
> > +
> > + return ret;
> > +}
> > +
> > +static u32 cdns_hdmi_i2c_func(struct i2c_adapter *adapter)
> > +{
> > + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
> > +}
> > +
> > +static const struct i2c_algorithm cdns_hdmi_algorithm = {
> > + .master_xfer = cdns_hdmi_i2c_xfer,
> > + .functionality = cdns_hdmi_i2c_func,
> > +};
> > +
> > +struct i2c_adapter *cdns_hdmi_i2c_adapter(struct
> cdns_mhdp8501_device *mhdp)
> > +{
> > + struct i2c_adapter *adap;
> > + struct cdns_hdmi_i2c *i2c;
> > + int ret;
> > +
> > + i2c = devm_kzalloc(mhdp->dev, sizeof(*i2c), GFP_KERNEL);
> > + if (!i2c)
> > + return ERR_PTR(-ENOMEM);
> > +
> > + mutex_init(&i2c->lock);
> > +
> > + adap = &i2c->adap;
> > + adap->owner = THIS_MODULE;
> > + adap->dev.parent = mhdp->dev;
> > + adap->algo = &cdns_hdmi_algorithm;
> > + strscpy(adap->name, "MHDP HDMI", sizeof(adap->name));
> > + i2c_set_adapdata(adap, mhdp);
> > +
> > + ret = i2c_add_adapter(adap);
> > + if (ret) {
> > + dev_warn(mhdp->dev, "cannot add %s I2C adapter\n",
> adap->name);
> > + devm_kfree(mhdp->dev, i2c);
> > + return ERR_PTR(ret);
> > + }
> > +
> > + mhdp->hdmi.i2c = i2c;
> > +
> > + return adap;
> > +}
> > +
> > +static enum drm_mode_status
> > +cdns_hdmi_tmds_char_rate_valid(const struct drm_bridge *bridge,
> > + const struct drm_display_mode *mode,
> > + unsigned long long tmds_rate)
> > +{
> > + struct cdns_mhdp8501_device *mhdp = bridge->driver_private;
> > + union phy_configure_opts phy_cfg;
> > + int ret;
> > +
> > + phy_cfg.hdmi.tmds_char_rate = tmds_rate;
> > +
> > + ret = phy_validate(mhdp->phy, PHY_MODE_HDMI, 0, &phy_cfg);
> > + if (ret < 0)
> > + return MODE_CLOCK_RANGE;
> > +
> > + return MODE_OK;
> > +}
> > +
> > +static enum drm_mode_status
> > +cdns_hdmi_bridge_mode_valid(struct drm_bridge *bridge,
> > + const struct drm_display_info *info,
> > + const struct drm_display_mode *mode)
> > +{
> > + /* We don't support double-clocked and Interlaced modes */
> > + if (mode->flags & DRM_MODE_FLAG_DBLCLK ||
> > + mode->flags & DRM_MODE_FLAG_INTERLACE)
> > + return MODE_BAD;
>
>
> Should be handled by the generic code.
OK.
Best regards，
Sandor
>
> > +
> > + if (mode->hdisplay > 3840)
> > + return MODE_BAD_HVALUE;
> > +
> > + if (mode->vdisplay > 2160)
> > + return MODE_BAD_VVALUE;
> > +
> > + return MODE_OK;
> > +}
> > +
> > +static enum drm_connector_status
> > +cdns_hdmi_bridge_detect(struct drm_bridge *bridge)
> > +{
> > + struct cdns_mhdp8501_device *mhdp = bridge->driver_private;
> > +
> > + return cdns_mhdp8501_detect(mhdp);
> > +}
> > +
> > +static const struct drm_edid
> > +*cdns_hdmi_bridge_edid_read(struct drm_bridge *bridge,
> > + struct drm_connector *connector)
> > +{
> > + struct cdns_mhdp8501_device *mhdp = bridge->driver_private;
> > +
> > + return drm_edid_read_custom(connector,
> cdns_hdmi_get_edid_block, mhdp);
> > +}
> > +
> > +static void cdns_hdmi_bridge_atomic_disable(struct drm_bridge *bridge,
> > + struct
> drm_bridge_state *old_state)
> > +{
> > + struct cdns_mhdp8501_device *mhdp = bridge->driver_private;
> > +
> > + mhdp->curr_conn = NULL;
> > +
> > + phy_power_off(mhdp->phy);
> > +}
> > +
> > +static void cdns_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
> > + struct drm_bridge_state
> *old_state)
> > +{
> > + struct cdns_mhdp8501_device *mhdp = bridge->driver_private;
> > + struct drm_atomic_state *state = old_state->base.state;
> > + struct drm_connector *connector;
> > + struct drm_crtc_state *crtc_state;
> > + struct drm_connector_state *conn_state;
> > + struct drm_connector_hdmi_state *hdmi;
> > + union phy_configure_opts phy_cfg;
> > + int ret;
> > +
> > + connector = drm_atomic_get_new_connector_for_encoder(state,
> > +
> bridge->encoder);
> > + if (WARN_ON(!connector))
> > + return;
> > +
> > + mhdp->curr_conn = connector;
> > +
> > + conn_state = drm_atomic_get_new_connector_state(state,
> connector);
> > + if (WARN_ON(!conn_state))
> > + return;
> > +
> > + crtc_state = drm_atomic_get_new_crtc_state(state,
> conn_state->crtc);
> > + if (WARN_ON(!crtc_state))
> > + return;
> > +
> > + drm_atomic_helper_connector_hdmi_update_infoframes(connector,
> state);
> > +
> > + /* Line swapping */
> > + cdns_mhdp_reg_write(&mhdp->base, LANES_CONFIG, 0x00400000
> | mhdp->lane_mapping);
> > +
> > + hdmi = &conn_state->hdmi;
> > + if (WARN_ON(!hdmi))
> > + return;
> > +
> > + phy_cfg.hdmi.tmds_char_rate = hdmi->tmds_char_rate;
> > + ret = phy_configure(mhdp->phy, &phy_cfg);
> > + if (ret) {
> > + dev_err(mhdp->dev, "%s: phy_configure() failed: %d\n",
> > + __func__, ret);
> > + return;
> > + }
> > +
> > + phy_power_on(mhdp->phy);
> > +
> > + cdns_hdmi_sink_config(mhdp, hdmi->tmds_char_rate);
> > +
> > + ret = cdns_hdmi_ctrl_init(mhdp);
> > + if (ret < 0) {
> > + dev_err(mhdp->dev, "hdmi ctrl init failed = %d\n", ret);
> > + return;
> > + }
> > +
> > + /* Config GCP */
> > + if (hdmi->output_bpc == 8)
> > + cdns_hdmi_disable_gcp(mhdp);
> > + else
> > + cdns_hdmi_enable_gcp(mhdp);
> > +
> > + ret = cdns_hdmi_mode_config(mhdp, &crtc_state->adjusted_mode,
> hdmi);
> > + if (ret < 0) {
> > + dev_err(mhdp->dev, "CDN_API_HDMITX_SetVic_blocking
> ret = %d\n", ret);
> > + return;
> > + }
> > +}
> > +
> > +static int cdns_hdmi_bridge_clear_infoframe(struct drm_bridge *bridge,
> > + enum
> hdmi_infoframe_type type)
> > +{
> > + struct cdns_mhdp8501_device *mhdp = bridge->driver_private;
> > +
> > + switch (type) {
> > + case HDMI_INFOFRAME_TYPE_AVI:
> > + cdns_hdmi_clear_infoframe(mhdp, 0,
> HDMI_INFOFRAME_TYPE_AVI);
> > + break;
> > + case HDMI_INFOFRAME_TYPE_SPD:
> > + cdns_hdmi_clear_infoframe(mhdp, 1,
> HDMI_INFOFRAME_TYPE_SPD);
> > + break;
> > + case HDMI_INFOFRAME_TYPE_VENDOR:
> > + cdns_hdmi_clear_infoframe(mhdp, 2,
> HDMI_INFOFRAME_TYPE_VENDOR);
> > + break;
> > + default:
> > + dev_dbg(mhdp->dev, "Unsupported infoframe type %x\n",
> type);
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int cdns_hdmi_bridge_write_infoframe(struct drm_bridge *bridge,
> > + enum
> hdmi_infoframe_type type,
> > + const u8 *buffer, size_t
> len)
> > +{
> > + struct cdns_mhdp8501_device *mhdp = bridge->driver_private;
> > +
> > + switch (type) {
> > + case HDMI_INFOFRAME_TYPE_AVI:
> > + cdns_hdmi_config_infoframe(mhdp, 0, len, buffer,
> HDMI_INFOFRAME_TYPE_AVI);
> > + break;
> > + case HDMI_INFOFRAME_TYPE_SPD:
> > + cdns_hdmi_config_infoframe(mhdp, 1, len, buffer,
> HDMI_INFOFRAME_TYPE_SPD);
> > + break;
> > + case HDMI_INFOFRAME_TYPE_VENDOR:
> > + cdns_hdmi_config_infoframe(mhdp, 2, len, buffer,
> HDMI_INFOFRAME_TYPE_VENDOR);
> > + break;
> > + default:
> > + dev_dbg(mhdp->dev, "Unsupported infoframe type %x\n",
> type);
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int cdns_hdmi_bridge_atomic_check(struct drm_bridge *bridge,
> > + struct drm_bridge_state
> *bridge_state,
> > + struct drm_crtc_state
> *crtc_state,
> > + struct
> drm_connector_state *conn_state)
> > +{
> > + return
> drm_atomic_helper_connector_hdmi_check(conn_state->connector,
> conn_state->state);
> > +}
> > +
> > +const struct drm_bridge_funcs cdns_hdmi_bridge_funcs = {
> > + .attach = cdns_hdmi_bridge_attach,
> > + .detect = cdns_hdmi_bridge_detect,
> > + .edid_read = cdns_hdmi_bridge_edid_read,
> > + .mode_valid = cdns_hdmi_bridge_mode_valid,
> > + .atomic_enable = cdns_hdmi_bridge_atomic_enable,
> > + .atomic_disable = cdns_hdmi_bridge_atomic_disable,
> > + .atomic_check = cdns_hdmi_bridge_atomic_check,
> > + .atomic_duplicate_state =
> drm_atomic_helper_bridge_duplicate_state,
> > + .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
> > + .atomic_reset = drm_atomic_helper_bridge_reset,
> > + .hdmi_clear_infoframe = cdns_hdmi_bridge_clear_infoframe,
> > + .hdmi_write_infoframe = cdns_hdmi_bridge_write_infoframe,
> > + .hdmi_tmds_char_rate_valid = cdns_hdmi_tmds_char_rate_valid,
> > +};
> > --
> > 2.34.1
> >
>
> --
> With best wishes
> Dmitry
