On 06/28/2017 08:44 AM, Archit Taneja wrote:
>
>
> On 06/19/2017 09:58 PM, Philippe CORNU wrote:
>> Add a Synopsys Designware MIPI DSI host DRM bridge driver, based on the
>> Rockchip version from rockchip/dw-mipi-dsi.c with phy & bridge APIs.
>>
>> Signed-off-by: Philippe CORNU <philippe.cornu@xxxxxx>
>> ---
>> drivers/gpu/drm/bridge/synopsys/Kconfig | 6 +
>> drivers/gpu/drm/bridge/synopsys/Makefile | 2 +
>> drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 976
>> ++++++++++++++++++++++++++
>> include/drm/bridge/dw_mipi_dsi.h | 39 +
>> 4 files changed, 1023 insertions(+)
>> create mode 100644 drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
>> create mode 100644 include/drm/bridge/dw_mipi_dsi.h
>>
>> diff --git a/drivers/gpu/drm/bridge/synopsys/Kconfig
>> b/drivers/gpu/drm/bridge/synopsys/Kconfig
>> index 40d2827..f00ee26 100644
>> --- a/drivers/gpu/drm/bridge/synopsys/Kconfig
>> +++ b/drivers/gpu/drm/bridge/synopsys/Kconfig
>> @@ -21,3 +21,9 @@ config DRM_DW_HDMI_I2S_AUDIO
>> help
>> Support the I2S Audio interface which is part of the Synopsys
>> Designware HDMI block.
>> +
>> +config DRM_DW_MIPI_DSI
>> + tristate
>> + select DRM_KMS_HELPER
>> + select DRM_MIPI_DSI
>> + select DRM_PANEL_BRIDGE
>> diff --git a/drivers/gpu/drm/bridge/synopsys/Makefile
>> b/drivers/gpu/drm/bridge/synopsys/Makefile
>> index 17aa7a6..5f57d36 100644
>> --- a/drivers/gpu/drm/bridge/synopsys/Makefile
>> +++ b/drivers/gpu/drm/bridge/synopsys/Makefile
>> @@ -3,3 +3,5 @@
>> obj-$(CONFIG_DRM_DW_HDMI) += dw-hdmi.o
>> obj-$(CONFIG_DRM_DW_HDMI_AHB_AUDIO) += dw-hdmi-ahb-audio.o
>> obj-$(CONFIG_DRM_DW_HDMI_I2S_AUDIO) += dw-hdmi-i2s-audio.o
>> +
>> +obj-$(CONFIG_DRM_DW_MIPI_DSI) += dw-mipi-dsi.o
>> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
>> b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
>> new file mode 100644
>> index 0000000..416ed7f
>> --- /dev/null
>> +++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
>> @@ -0,0 +1,976 @@
>> +/*
>> + * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd
>> + * Copyright (C) STMicroelectronics SA 2017
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License as published by
>> + * the Free Software Foundation; either version 2 of the License, or
>> + * (at your option) any later version.
>> + *
>> + * Modified by Philippe Cornu <philippe.cornu@xxxxxx>
>> + * This generic Synopsys DesignWare MIPI DSI host driver is based on the
>> + * Rockchip version from rockchip/dw-mipi-dsi.c with phy & bridge APIs.
>> + */
>> +
>> +#include <linux/clk.h>
>> +#include <linux/component.h>
>> +#include <linux/iopoll.h>
>> +#include <linux/module.h>
>> +#include <linux/of_device.h>
>> +#include <linux/pm_runtime.h>
>> +#include <linux/reset.h>
>> +#include <drm/drmP.h>
>> +#include <drm/drm_atomic_helper.h>
>> +#include <drm/drm_bridge.h>
>> +#include <drm/drm_crtc.h>
>> +#include <drm/drm_crtc_helper.h>
>> +#include <drm/drm_mipi_dsi.h>
>> +#include <drm/drm_of.h>
>> +#include <drm/bridge/dw_mipi_dsi.h>
>> +#include <video/mipi_display.h>
>> +
>> +#define DSI_VERSION 0x00
>> +#define DSI_PWR_UP 0x04
>> +#define RESET 0
>> +#define POWERUP BIT(0)
>> +
>> +#define DSI_CLKMGR_CFG 0x08
>> +#define TO_CLK_DIVIDSION(div) (((div) & 0xff) << 8)
>> +#define TX_ESC_CLK_DIVIDSION(div) (((div) & 0xff) << 0)
>> +
>> +#define DSI_DPI_VCID 0x0c
>> +#define DPI_VID(vid) (((vid) & 0x3) << 0)
>> +
>> +#define DSI_DPI_COLOR_CODING 0x10
>> +#define EN18_LOOSELY BIT(8)
>> +#define DPI_COLOR_CODING_16BIT_1 0x0
>> +#define DPI_COLOR_CODING_16BIT_2 0x1
>> +#define DPI_COLOR_CODING_16BIT_3 0x2
>> +#define DPI_COLOR_CODING_18BIT_1 0x3
>> +#define DPI_COLOR_CODING_18BIT_2 0x4
>> +#define DPI_COLOR_CODING_24BIT 0x5
>> +
>> +#define DSI_DPI_CFG_POL 0x14
>> +#define COLORM_ACTIVE_LOW BIT(4)
>> +#define SHUTD_ACTIVE_LOW BIT(3)
>> +#define HSYNC_ACTIVE_LOW BIT(2)
>> +#define VSYNC_ACTIVE_LOW BIT(1)
>> +#define DATAEN_ACTIVE_LOW BIT(0)
>> +
>> +#define DSI_DPI_LP_CMD_TIM 0x18
>> +#define OUTVACT_LPCMD_TIME(p) (((p) & 0xff) << 16)
>> +#define INVACT_LPCMD_TIME(p) ((p) & 0xff)
>> +
>> +#define DSI_DBI_CFG 0x20
>> +#define DSI_DBI_CMDSIZE 0x28
>> +
>> +#define DSI_PCKHDL_CFG 0x2c
>> +#define EN_CRC_RX BIT(4)
>> +#define EN_ECC_RX BIT(3)
>> +#define EN_BTA BIT(2)
>> +#define EN_EOTP_RX BIT(1)
>> +#define EN_EOTP_TX BIT(0)
>> +
>> +#define DSI_MODE_CFG 0x34
>> +#define ENABLE_VIDEO_MODE 0
>> +#define ENABLE_CMD_MODE BIT(0)
>> +
>> +#define DSI_VID_MODE_CFG 0x38
>> +#define FRAME_BTA_ACK BIT(14)
>> +#define ENABLE_LOW_POWER (0x3f << 8)
>> +#define ENABLE_LOW_POWER_MASK (0x3f << 8)
>> +#define VID_MODE_TYPE_NON_BURST_SYNC_PULSES 0x0
>> +#define VID_MODE_TYPE_NON_BURST_SYNC_EVENTS 0x1
>> +#define VID_MODE_TYPE_BURST 0x2
>> +#define VID_MODE_TYPE_MASK 0x3
>> +
>> +#define DSI_VID_PKT_SIZE 0x3c
>> +#define VID_PKT_SIZE(p) (((p) & 0x3fff) << 0)
>> +#define VID_PKT_MAX_SIZE 0x3fff
>> +
>> +#define DSI_VID_HSA_TIME 0x48
>> +#define DSI_VID_HBP_TIME 0x4c
>> +#define DSI_VID_HLINE_TIME 0x50
>> +#define DSI_VID_VSA_LINES 0x54
>> +#define DSI_VID_VBP_LINES 0x58
>> +#define DSI_VID_VFP_LINES 0x5c
>> +#define DSI_VID_VACTIVE_LINES 0x60
>> +#define DSI_CMD_MODE_CFG 0x68
>> +#define MAX_RD_PKT_SIZE_LP BIT(24)
>> +#define DCS_LW_TX_LP BIT(19)
>> +#define DCS_SR_0P_TX_LP BIT(18)
>> +#define DCS_SW_1P_TX_LP BIT(17)
>> +#define DCS_SW_0P_TX_LP BIT(16)
>> +#define GEN_LW_TX_LP BIT(14)
>> +#define GEN_SR_2P_TX_LP BIT(13)
>> +#define GEN_SR_1P_TX_LP BIT(12)
>> +#define GEN_SR_0P_TX_LP BIT(11)
>> +#define GEN_SW_2P_TX_LP BIT(10)
>> +#define GEN_SW_1P_TX_LP BIT(9)
>> +#define GEN_SW_0P_TX_LP BIT(8)
>> +#define EN_ACK_RQST BIT(1)
>> +#define EN_TEAR_FX BIT(0)
>> +
>> +#define CMD_MODE_ALL_LP (MAX_RD_PKT_SIZE_LP | \
>> + DCS_LW_TX_LP | \
>> + DCS_SR_0P_TX_LP | \
>> + DCS_SW_1P_TX_LP | \
>> + DCS_SW_0P_TX_LP | \
>> + GEN_LW_TX_LP | \
>> + GEN_SR_2P_TX_LP | \
>> + GEN_SR_1P_TX_LP | \
>> + GEN_SR_0P_TX_LP | \
>> + GEN_SW_2P_TX_LP | \
>> + GEN_SW_1P_TX_LP | \
>> + GEN_SW_0P_TX_LP)
>> +
>> +#define DSI_GEN_HDR 0x6c
>> +#define GEN_HDATA(data) (((data) & 0xffff) << 8)
>> +#define GEN_HDATA_MASK (0xffff << 8)
>> +#define GEN_HTYPE(type) (((type) & 0xff) << 0)
>> +#define GEN_HTYPE_MASK 0xff
>> +
>> +#define DSI_GEN_PLD_DATA 0x70
>> +
>> +#define DSI_CMD_PKT_STATUS 0x74
>> +#define GEN_CMD_EMPTY BIT(0)
>> +#define GEN_CMD_FULL BIT(1)
>> +#define GEN_PLD_W_EMPTY BIT(2)
>> +#define GEN_PLD_W_FULL BIT(3)
>> +#define GEN_PLD_R_EMPTY BIT(4)
>> +#define GEN_PLD_R_FULL BIT(5)
>> +#define GEN_RD_CMD_BUSY BIT(6)
>> +
>> +#define DSI_TO_CNT_CFG 0x78
>> +#define HSTX_TO_CNT(p) (((p) & 0xffff) << 16)
>> +#define LPRX_TO_CNT(p) ((p) & 0xffff)
>> +
>> +#define DSI_BTA_TO_CNT 0x8c
>> +#define DSI_LPCLK_CTRL 0x94
>> +#define AUTO_CLKLANE_CTRL BIT(1)
>> +#define PHY_TXREQUESTCLKHS BIT(0)
>> +
>> +#define DSI_PHY_TMR_LPCLK_CFG 0x98
>> +#define PHY_CLKHS2LP_TIME(lbcc) (((lbcc) & 0x3ff) << 16)
>> +#define PHY_CLKLP2HS_TIME(lbcc) ((lbcc) & 0x3ff)
>> +
>> +#define DSI_PHY_TMR_CFG 0x9c
>> +#define PHY_HS2LP_TIME(lbcc) (((lbcc) & 0xff) << 24)
>> +#define PHY_LP2HS_TIME(lbcc) (((lbcc) & 0xff) << 16)
>> +#define MAX_RD_TIME(lbcc) ((lbcc) & 0x7fff)
>> +
>> +#define DSI_PHY_RSTZ 0xa0
>> +#define PHY_DISFORCEPLL 0
>> +#define PHY_ENFORCEPLL BIT(3)
>> +#define PHY_DISABLECLK 0
>> +#define PHY_ENABLECLK BIT(2)
>> +#define PHY_RSTZ 0
>> +#define PHY_UNRSTZ BIT(1)
>> +#define PHY_SHUTDOWNZ 0
>> +#define PHY_UNSHUTDOWNZ BIT(0)
>> +
>> +#define DSI_PHY_IF_CFG 0xa4
>> +#define N_LANES(n) ((((n) - 1) & 0x3) << 0)
>> +#define PHY_STOP_WAIT_TIME(cycle) (((cycle) & 0xff) << 8)
>> +
>> +#define DSI_PHY_STATUS 0xb0
>> +#define LOCK BIT(0)
>> +#define STOP_STATE_CLK_LANE BIT(2)
>> +
>> +#define DSI_PHY_TST_CTRL0 0xb4
>> +#define PHY_TESTCLK BIT(1)
>> +#define PHY_UNTESTCLK 0
>> +#define PHY_TESTCLR BIT(0)
>> +#define PHY_UNTESTCLR 0
>> +
>> +#define DSI_PHY_TST_CTRL1 0xb8
>> +#define PHY_TESTEN BIT(16)
>> +#define PHY_UNTESTEN 0
>> +#define PHY_TESTDOUT(n) (((n) & 0xff) << 8)
>> +#define PHY_TESTDIN(n) (((n) & 0xff) << 0)
>> +
>> +#define DSI_INT_ST0 0xbc
>> +#define DSI_INT_ST1 0xc0
>> +#define DSI_INT_MSK0 0xc4
>> +#define DSI_INT_MSK1 0xc8
>> +
>> +#define PHY_STATUS_TIMEOUT_US 10000
>> +#define CMD_PKT_STATUS_TIMEOUT_US 20000
>> +
>> +struct dw_mipi_dsi {
>> + struct drm_bridge bridge;
>> + struct mipi_dsi_host dsi_host;
>> + struct drm_bridge *panel_bridge;
>> + bool is_panel_bridge;
>> + struct device *dev;
>> + void __iomem *base;
>> +
>> + struct clk *pclk;
>> +
>> + unsigned int lane_mbps; /* per lane */
>> + u32 channel;
>> + u32 lanes;
>> + u32 format;
>> + unsigned long mode_flags;
>> +
>> + const struct dw_mipi_dsi_plat_data *plat_data;
>> +};
>> +
>> +/*
>> + * The controller should generate 2 frames before
>> + * preparing the peripheral.
>> + */
>> +static void dw_mipi_dsi_wait_for_two_frames(struct drm_display_mode
>> *mode)
>> +{
>> + int refresh, two_frames;
>> +
>> + refresh = drm_mode_vrefresh(mode);
>> + two_frames = DIV_ROUND_UP(MSEC_PER_SEC, refresh) * 2;
>> + msleep(two_frames);
>> +}
>> +
>> +static inline struct dw_mipi_dsi *host_to_dsi(struct mipi_dsi_host
>> *host)
>> +{
>> + return container_of(host, struct dw_mipi_dsi, dsi_host);
>> +}
>> +
>> +static inline struct dw_mipi_dsi *bridge_to_dsi(struct drm_bridge
>> *bridge)
>> +{
>> + return container_of(bridge, struct dw_mipi_dsi, bridge);
>> +}
>> +
>> +static inline void dsi_write(struct dw_mipi_dsi *dsi, u32 reg, u32 val)
>> +{
>> + writel(val, dsi->base + reg);
>> +}
>> +
>> +static inline u32 dsi_read(struct dw_mipi_dsi *dsi, u32 reg)
>> +{
>> + return readl(dsi->base + reg);
>> +}
>> +
>> +static int dw_mipi_dsi_host_attach(struct mipi_dsi_host *host,
>> + struct mipi_dsi_device *device)
>> +{
>> + struct dw_mipi_dsi *dsi = host_to_dsi(host);
>> + struct drm_bridge *bridge;
>> + struct drm_panel *panel;
>> + int ret;
>> +
>> + if (device->lanes > dsi->plat_data->max_data_lanes) {
>> + dev_err(dsi->dev, "the number of data lanes(%u) is too many\n",
>> + device->lanes);
>> + return -EINVAL;
>> + }
>> +
>> + dsi->lanes = device->lanes;
>> + dsi->channel = device->channel;
>> + dsi->format = device->format;
>> + dsi->mode_flags = device->mode_flags;
>> +
>> + ret = drm_of_find_panel_or_bridge(host->dev->of_node, 1, 0,
>> + &panel, &bridge);
>> + if (ret)
>> + return ret;
>> +
>> + if (panel) {
>> + bridge = drm_panel_bridge_add(panel, DRM_MODE_CONNECTOR_DSI);
>> + if (IS_ERR(bridge))
>> + return PTR_ERR(bridge);
>> + dsi->is_panel_bridge = true;
>> + }
>> +
>> + dsi->panel_bridge = bridge;
>> +
>> + return drm_bridge_add(&dsi->bridge);
>> +}
>> +
>> +static int dw_mipi_dsi_host_detach(struct mipi_dsi_host *host,
>> + struct mipi_dsi_device *device)
>> +{
>> + struct dw_mipi_dsi *dsi = host_to_dsi(host);
>> +
>> + if (dsi->is_panel_bridge)
>> + drm_panel_bridge_remove(dsi->panel_bridge);
>> +
>> + drm_bridge_remove(&dsi->bridge);
>> +
>> + return 0;
>> +}
>> +
>> +static void dw_mipi_message_config(struct dw_mipi_dsi *dsi,
>> + const struct mipi_dsi_msg *msg)
>> +{
>> + bool lpm = msg->flags & MIPI_DSI_MSG_USE_LPM;
>> + u32 val = 0;
>> +
>> + if (msg->flags & MIPI_DSI_MSG_REQ_ACK)
>> + val |= EN_ACK_RQST;
>> + if (lpm)
>> + val |= CMD_MODE_ALL_LP;
>> +
>> + dsi_write(dsi, DSI_LPCLK_CTRL, lpm ? 0 : PHY_TXREQUESTCLKHS);
>> + dsi_write(dsi, DSI_CMD_MODE_CFG, val);
>> +}
>> +
>> +static int dw_mipi_dsi_gen_pkt_hdr_write(struct dw_mipi_dsi *dsi, u32
>> hdr_val)
>> +{
>> + int ret;
>> + u32 val, mask;
>> +
>> + ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS,
>> + val, !(val & GEN_CMD_FULL), 1000,
>> + CMD_PKT_STATUS_TIMEOUT_US);
>> + if (ret < 0) {
>> + dev_err(dsi->dev, "failed to get available command FIFO\n");
>> + return ret;
>> + }
>> +
>> + dsi_write(dsi, DSI_GEN_HDR, hdr_val);
>> +
>> + mask = GEN_CMD_EMPTY | GEN_PLD_W_EMPTY;
>> + ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS,
>> + val, (val & mask) == mask,
>> + 1000, CMD_PKT_STATUS_TIMEOUT_US);
>> + if (ret < 0) {
>> + dev_err(dsi->dev, "failed to write command FIFO\n");
>> + return ret;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int dw_mipi_dsi_dcs_short_write(struct dw_mipi_dsi *dsi,
>> + const struct mipi_dsi_msg *msg)
>> +{
>> + const u8 *tx_buf = msg->tx_buf;
>> + u16 data = 0;
>> + u32 val;
>> +
>> + if (msg->tx_len > 0)
>> + data |= tx_buf[0];
>> + if (msg->tx_len > 1)
>> + data |= tx_buf[1] << 8;
>> +
>> + if (msg->tx_len > 2) {
>> + dev_err(dsi->dev, "too long tx buf length %zu for short
>> write\n",
>> + msg->tx_len);
>> + return -EINVAL;
>> + }
>> +
>> + val = GEN_HDATA(data) | GEN_HTYPE(msg->type);
>> + return dw_mipi_dsi_gen_pkt_hdr_write(dsi, val);
>> +}
>> +
>> +static int dw_mipi_dsi_dcs_long_write(struct dw_mipi_dsi *dsi,
>> + const struct mipi_dsi_msg *msg)
>> +{
>> + const u8 *tx_buf = msg->tx_buf;
>> + int len = msg->tx_len, pld_data_bytes = sizeof(u32), ret;
>> + u32 hdr_val = GEN_HDATA(msg->tx_len) | GEN_HTYPE(msg->type);
>> + u32 remainder;
>> + u32 val;
>> +
>> + if (msg->tx_len < 3) {
>> + dev_err(dsi->dev, "wrong tx buf length %zu for long write\n",
>> + msg->tx_len);
>> + return -EINVAL;
>> + }
>> +
>> + while (DIV_ROUND_UP(len, pld_data_bytes)) {
>> + if (len < pld_data_bytes) {
>> + remainder = 0;
>> + memcpy(&remainder, tx_buf, len);
>> + dsi_write(dsi, DSI_GEN_PLD_DATA, remainder);
>> + len = 0;
>> + } else {
>> + memcpy(&remainder, tx_buf, pld_data_bytes);
>> + dsi_write(dsi, DSI_GEN_PLD_DATA, remainder);
>> + tx_buf += pld_data_bytes;
>> + len -= pld_data_bytes;
>> + }
>> +
>> + ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS,
>> + val, !(val & GEN_PLD_W_FULL), 1000,
>> + CMD_PKT_STATUS_TIMEOUT_US);
>> + if (ret < 0) {
>> + dev_err(dsi->dev,
>> + "failed to get available write payload FIFO\n");
>> + return ret;
>> + }
>> + }
>> +
>> + return dw_mipi_dsi_gen_pkt_hdr_write(dsi, hdr_val);
>> +}
>> +
>> +static ssize_t dw_mipi_dsi_host_transfer(struct mipi_dsi_host *host,
>> + const struct mipi_dsi_msg *msg)
>> +{
>> + struct dw_mipi_dsi *dsi = host_to_dsi(host);
>> + int ret;
>> +
>> + /*
>> + * TODO dw drv improvements
>> + * use mipi_dsi_create_packet() instead of all following
>> + * functions and code (no switch cases, no
>> + * dw_mipi_dsi_dcs_short_write(), only the loop in long_write...)
>> + * and use packet.header...
>> + */
>> + dw_mipi_message_config(dsi, msg);
>> +
>> + switch (msg->type) {
>> + case MIPI_DSI_DCS_SHORT_WRITE:
>> + case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
>> + case MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE:
>> + ret = dw_mipi_dsi_dcs_short_write(dsi, msg);
>> + break;
>> + case MIPI_DSI_DCS_LONG_WRITE:
>> + ret = dw_mipi_dsi_dcs_long_write(dsi, msg);
>> + break;
>> + default:
>> + dev_err(dsi->dev, "unsupported message type 0x%02x\n",
>> + msg->type);
>> + ret = -EINVAL;
>> + }
>> +
>> + return ret;
>> +}
>> +
>> +static const struct mipi_dsi_host_ops dw_mipi_dsi_host_ops = {
>> + .attach = dw_mipi_dsi_host_attach,
>> + .detach = dw_mipi_dsi_host_detach,
>> + .transfer = dw_mipi_dsi_host_transfer,
>> +};
>> +
>> +static void dw_mipi_dsi_video_mode_config(struct dw_mipi_dsi *dsi)
>> +{
>> + u32 val;
>> +
>> + /*
>> + * TODO dw drv improvements
>> + * enabling low power is panel-dependent, we should use the
>> + * panel configuration here...
>> + */
>> + val = ENABLE_LOW_POWER;
>> +
>> + if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST)
>> + val |= VID_MODE_TYPE_BURST;
>> + else if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
>> + val |= VID_MODE_TYPE_NON_BURST_SYNC_PULSES;
>> + else
>> + val |= VID_MODE_TYPE_NON_BURST_SYNC_EVENTS;
>> +
>> + dsi_write(dsi, DSI_VID_MODE_CFG, val);
>> +}
>> +
>> +static void dw_mipi_dsi_set_mode(struct dw_mipi_dsi *dsi,
>> + unsigned long mode_flags)
>> +{
>> + dsi_write(dsi, DSI_PWR_UP, RESET);
>> +
>> + if (mode_flags & MIPI_DSI_MODE_VIDEO) {
>> + dsi_write(dsi, DSI_MODE_CFG, ENABLE_VIDEO_MODE);
>> + dw_mipi_dsi_video_mode_config(dsi);
>> + dsi_write(dsi, DSI_LPCLK_CTRL, PHY_TXREQUESTCLKHS);
>> + } else {
>> + dsi_write(dsi, DSI_MODE_CFG, ENABLE_CMD_MODE);
>> + }
>> +
>> + dsi_write(dsi, DSI_PWR_UP, POWERUP);
>> +}
>> +
>> +static void dw_mipi_dsi_disable(struct dw_mipi_dsi *dsi)
>> +{
>> + dsi_write(dsi, DSI_PWR_UP, RESET);
>> + dsi_write(dsi, DSI_PHY_RSTZ, PHY_RSTZ);
>> +}
>> +
>> +static void dw_mipi_dsi_init(struct dw_mipi_dsi *dsi)
>> +{
>> + /*
>> + * The maximum permitted escape clock is 20MHz and it is derived
>> from
>> + * lanebyteclk, which is running at "lane_mbps / 8". Thus we want:
>> + *
>> + * (lane_mbps >> 3) / esc_clk_division < 20
>> + * which is:
>> + * (lane_mbps >> 3) / 20 > esc_clk_division
>> + */
>> + u32 esc_clk_division = (dsi->lane_mbps >> 3) / 20 + 1;
>> +
>> + dsi_write(dsi, DSI_PWR_UP, RESET);
>> +
>> + /*
>> + * TODO dw drv improvements
>> + * timeout clock division should be computed with the
>> + * high speed transmission counter timeout and byte lane...
>> + */
>> + dsi_write(dsi, DSI_CLKMGR_CFG, TO_CLK_DIVIDSION(10) |
>> + TX_ESC_CLK_DIVIDSION(esc_clk_division));
>> +}
>> +
>> +static void dw_mipi_dsi_dpi_config(struct dw_mipi_dsi *dsi,
>> + struct drm_display_mode *mode)
>> +{
>> + u32 val = 0, color = 0;
>> +
>> + switch (dsi->format) {
>> + case MIPI_DSI_FMT_RGB888:
>> + color = DPI_COLOR_CODING_24BIT;
>> + break;
>> + case MIPI_DSI_FMT_RGB666:
>> + color = DPI_COLOR_CODING_18BIT_2 | EN18_LOOSELY;
>> + break;
>> + case MIPI_DSI_FMT_RGB666_PACKED:
>> + color = DPI_COLOR_CODING_18BIT_1;
>> + break;
>> + case MIPI_DSI_FMT_RGB565:
>> + color = DPI_COLOR_CODING_16BIT_1;
>> + break;
>> + }
>> +
>> + if (mode->flags & DRM_MODE_FLAG_NVSYNC)
>> + val |= VSYNC_ACTIVE_LOW;
>> + if (mode->flags & DRM_MODE_FLAG_NHSYNC)
>> + val |= HSYNC_ACTIVE_LOW;
>> +
>> + dsi_write(dsi, DSI_DPI_VCID, DPI_VID(dsi->channel));
>> + dsi_write(dsi, DSI_DPI_COLOR_CODING, color);
>> + dsi_write(dsi, DSI_DPI_CFG_POL, val);
>> + /*
>> + * TODO dw drv improvements
>> + * largest packet sizes during hfp or during vsa/vpb/vfp
>> + * should be computed according to byte lane, lane number and only
>> + * if sending lp cmds in high speed is enable (PHY_TXREQUESTCLKHS)
>> + */
>> + dsi_write(dsi, DSI_DPI_LP_CMD_TIM, OUTVACT_LPCMD_TIME(4)
>> + | INVACT_LPCMD_TIME(4));
>> +}
>> +
>> +static void dw_mipi_dsi_packet_handler_config(struct dw_mipi_dsi *dsi)
>> +{
>> + dsi_write(dsi, DSI_PCKHDL_CFG, EN_CRC_RX | EN_ECC_RX | EN_BTA);
>> +}
>> +
>> +static void dw_mipi_dsi_video_packet_config(struct dw_mipi_dsi *dsi,
>> + struct drm_display_mode *mode)
>> +{
>> + /*
>> + * TODO dw drv improvements
>> + * only burst mode is supported here. For non-burst video modes,
>> + * we should compute DSI_VID_PKT_SIZE, DSI_VCCR.NUMC &
>> + * DSI_VNPCR.NPSIZE... especially because this driver supports
>> + * non-burst video modes, see dw_mipi_dsi_video_mode_config()...
>> + */
>> + dsi_write(dsi, DSI_VID_PKT_SIZE, VID_PKT_SIZE(mode->hdisplay));
>> +}
>> +
>> +static void dw_mipi_dsi_command_mode_config(struct dw_mipi_dsi *dsi)
>> +{
>> + /*
>> + * TODO dw drv improvements
>> + * compute high speed transmission counter timeout according
>> + * to the timeout clock division (TO_CLK_DIVIDSION) and byte lane...
>> + */
>> + dsi_write(dsi, DSI_TO_CNT_CFG, HSTX_TO_CNT(1000) |
>> LPRX_TO_CNT(1000));
>> + /*
>> + * TODO dw drv improvements
>> + * the Bus-Turn-Around Timeout Counter should be computed
>> + * according to byte lane...
>> + */
>> + dsi_write(dsi, DSI_BTA_TO_CNT, 0xd00);
>> + dsi_write(dsi, DSI_MODE_CFG, ENABLE_CMD_MODE);
>> +}
>> +
>> +/* Get lane byte clock cycles. */
>> +static u32 dw_mipi_dsi_get_hcomponent_lbcc(struct dw_mipi_dsi *dsi,
>> + struct drm_display_mode *mode,
>> + u32 hcomponent)
>> +{
>> + u32 frac, lbcc;
>> +
>> + lbcc = hcomponent * dsi->lane_mbps * MSEC_PER_SEC / 8;
>> +
>> + frac = lbcc % mode->clock;
>> + lbcc = lbcc / mode->clock;
>> + if (frac)
>> + lbcc++;
>> +
>> + return lbcc;
>> +}
>> +
>> +static void dw_mipi_dsi_line_timer_config(struct dw_mipi_dsi *dsi,
>> + struct drm_display_mode *mode)
>> +{
>> + u32 htotal, hsa, hbp, lbcc;
>> +
>> + htotal = mode->htotal;
>> + hsa = mode->hsync_end - mode->hsync_start;
>> + hbp = mode->htotal - mode->hsync_end;
>> +
>> + /*
>> + * TODO dw drv improvements
>> + * computations below may be improved...
>> + */
>> + lbcc = dw_mipi_dsi_get_hcomponent_lbcc(dsi, mode, htotal);
>> + dsi_write(dsi, DSI_VID_HLINE_TIME, lbcc);
>> +
>> + lbcc = dw_mipi_dsi_get_hcomponent_lbcc(dsi, mode, hsa);
>> + dsi_write(dsi, DSI_VID_HSA_TIME, lbcc);
>> +
>> + lbcc = dw_mipi_dsi_get_hcomponent_lbcc(dsi, mode, hbp);
>> + dsi_write(dsi, DSI_VID_HBP_TIME, lbcc);
>> +}
>> +
>> +static void dw_mipi_dsi_vertical_timing_config(struct dw_mipi_dsi *dsi,
>> + struct drm_display_mode *mode)
>> +{
>> + u32 vactive, vsa, vfp, vbp;
>> +
>> + vactive = mode->vdisplay;
>> + vsa = mode->vsync_end - mode->vsync_start;
>> + vfp = mode->vsync_start - mode->vdisplay;
>> + vbp = mode->vtotal - mode->vsync_end;
>> +
>> + dsi_write(dsi, DSI_VID_VACTIVE_LINES, vactive);
>> + dsi_write(dsi, DSI_VID_VSA_LINES, vsa);
>> + dsi_write(dsi, DSI_VID_VFP_LINES, vfp);
>> + dsi_write(dsi, DSI_VID_VBP_LINES, vbp);
>> +}
>> +
>> +static void dw_mipi_dsi_dphy_timing_config(struct dw_mipi_dsi *dsi)
>> +{
>> + /*
>> + * TODO dw drv improvements
>> + * data & clock lane timers should be computed according to panel
>> + * blankings and to the automatic clock lane control mode...
>> + * note: DSI_PHY_TMR_CFG.MAX_RD_TIME should be in line with
>> + * DSI_CMD_MODE_CFG.MAX_RD_PKT_SIZE_LP (see CMD_MODE_ALL_LP)
>> + */
>> + dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME(0x40)
>> + | PHY_LP2HS_TIME(0x40) | MAX_RD_TIME(10000));
>> +
>> + dsi_write(dsi, DSI_PHY_TMR_LPCLK_CFG, PHY_CLKHS2LP_TIME(0x40)
>> + | PHY_CLKLP2HS_TIME(0x40));
>> +}
>> +
>> +static void dw_mipi_dsi_dphy_interface_config(struct dw_mipi_dsi *dsi)
>> +{
>> + /*
>> + * TODO dw drv improvements
>> + * stop wait time should be the maximum between host dsi
>> + * and panel stop wait times
>> + */
>> + dsi_write(dsi, DSI_PHY_IF_CFG, PHY_STOP_WAIT_TIME(0x20) |
>> + N_LANES(dsi->lanes));
>> +}
>> +
>> +static void dw_mipi_dsi_dphy_init(struct dw_mipi_dsi *dsi)
>> +{
>> + /* Clear PHY state */
>> + dsi_write(dsi, DSI_PHY_RSTZ, PHY_DISFORCEPLL | PHY_DISABLECLK
>> + | PHY_RSTZ | PHY_SHUTDOWNZ);
>> + dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLR);
>> + dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_TESTCLR);
>> + dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLR);
>> +}
>> +
>> +static void dw_mipi_dsi_dphy_enable(struct dw_mipi_dsi *dsi)
>> +{
>> + u32 val;
>> + int ret;
>> +
>> + dsi_write(dsi, DSI_PHY_RSTZ, PHY_ENFORCEPLL | PHY_ENABLECLK |
>> + PHY_UNRSTZ | PHY_UNSHUTDOWNZ);
>> +
>> + ret = readl_poll_timeout(dsi->base + DSI_PHY_STATUS,
>> + val, val & LOCK, 1000, PHY_STATUS_TIMEOUT_US);
>> + if (ret < 0)
>> + DRM_DEBUG_DRIVER("failed to wait phy lock state\n");
>> +
>> + ret = readl_poll_timeout(dsi->base + DSI_PHY_STATUS,
>> + val, val & STOP_STATE_CLK_LANE, 1000,
>> + PHY_STATUS_TIMEOUT_US);
>> + if (ret < 0)
>> + DRM_DEBUG_DRIVER("failed to wait phy clk lane stop state\n");
>> +}
>> +
>> +static void dw_mipi_dsi_clear_err(struct dw_mipi_dsi *dsi)
>> +{
>> + dsi_read(dsi, DSI_INT_ST0);
>> + dsi_read(dsi, DSI_INT_ST1);
>> + dsi_write(dsi, DSI_INT_MSK0, 0);
>> + dsi_write(dsi, DSI_INT_MSK1, 0);
>> +}
>> +
>> +static void dw_mipi_dsi_bridge_post_disable(struct drm_bridge *bridge)
>> +{
>> + struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
>> +
>> + /*
>> + * Switch to cmd mode before panel-bridge disable & panel unprepare.
>> + * Note: panel-bridge disable & panel disable has been called
>> + * before by the drm framework.
>
> I don't think that's exactly the case. I think the sequence should be as
> in the
> call chain below.
>
Hi Archit,
And many thanks for your comments :-)
the word "post_" is missing in the above comment, sorry for that. I
should have written "Switch to cmd mode before panel-bridge post_disable
& ..." that is much more correct I think, I will update this comment for
v5 : )
>> + */
>> + dw_mipi_dsi_set_mode(dsi, 0);
>> +
>> + /*
>> + * TODO Only way found to call panel-bridge disable & panel
>> unprepare
>> + * before the dsi "final" disable... can we do better?
>
> I agree, this is a problem. More below.
Same remark here, I forgot "post_" in the above comment.
>
>> + */
>> + drm_bridge_post_disable(dsi->panel_bridge);
>> +
>
> I'm guessing our display chain is something like:
>
> KMS_encoder -> DW_DSI_bridge -> Panel_bridge -> Panel
>
> The order in which the disable ops are called:
>
> drm_bridge_disable(Panel_bridge)
> - drm_panel_disable(Panel)
> drm_bridge_disable(DW_DSI_bridge)
> encoder_funcs->prepare(KMS_encoder)
> drm_bridge_post_disable(DW_DSI_bridge)
> drm_bridge_post_disable(Panel_bridge)
> - drm_panel_unprepare(Panel)
>
100%-perfect sequence, I do agree with you : )
> Assuming that only drm_panel_unprepare() requires sending DSI commands,
Well, it really depends on DSI panels. For instance, panel drivers can
send DCS/Generic DSI commands:
* in drm_panel_disable(): then these commands are sent during blankings,
many lcds allow that. This is the proper place for backlight through DSI
(dimming or off), for sleep mode DCS commands...
or/and
* in drm_panel_unprepare(): then these commands are sent during a
"command mode" phase. This is the proper place for many things, from
backlight off through DSI, sleep mode DCS commands... to a full power
off (voltage regulators are switched off).
From my pov, both drm_panel_disable() & drm_panel_unprepare() may send
DSI commands... but it is not a real problem in fact as DSI commands can
be sent through blankings in video mode or can be sent in "command mode"...
> you could have
> switched to command mode in DW_DSI_bridge's disable() op, and do the
> "final" DSI disable
> in DW_DSI_bridge's post_disable(), but that would still result in
> drm_panel_unprepare()
> being called with the DSI host dead.
>
> The existing call chain of consecutive bridges is the most symmetric
> one, and the one
> expected to work in most cases, but it clearly doesn't work in your use
> case.
>
> We have a few options:
>
> - Undo the drm-panel-bridge stuff, and have the freedom of calling
> drm_panel ops in
> whatever order we want.
>
> - Put a big TODO/HACK comment here, saying that this needs to be fixed
> in the drm_bridge
> framework and the API needs to be updated to manage our own call chains.
> Also,
> instead of calling "drm_bridge_post_disable(dsi->panel_bridge);"
> explicitly, we
> can manually call panel_bridge->post_disable() op directly. This avoids
> us doing
> things recursively.
>
> We would implement the TODO task in drm_bridges only when there are more
> people
> desperately in the need to have customizable call chains of bridge ops
> for long
> display chains, so I don't see it being implemented in the near future,
> but I don't
> think there should be any problem keeping this hack in the dw dsi driver
> for now.
>
> What choice do you prefer?
Well, not so easy to decide what could be the best solution...
For the time being, I think I prefer keeping the panel bridge proposal
(the v4 one), for several reasons in fact:
* It saves "many" lines of code, and supporting *both* panels & bridges
(homogeneous approach).
* It helps reducing explicit calls like drm_panel_() or drm_bridge_()
letting the drm framework doing its job :-)
* It is not an issue to have a TODO/HACK for the only remaining function
call (drm_bridge_post_disable() here). I mean many others drivers calls
directly these panel & bridge functions and this forces panel drivers to
have in many places in their code "if (enabled) return;" or "if
(prepared) return;" and we should work in the future to improve that
(ie. Let's drm framework doing its job).
* It covers/offers the 3 important "hw disable" phases:
- panel sends DCS/Generic DSI commands during its blankings in a video
mode phase (most of the times, these commands are short, for backlight
updates or sleep for instance...), it's correspond to panel_disable().
- panel sends DCS/Generic DSI commands in a command mode phase (sleep,
power off...), it's correspond to panel_unprepare().
- the dsi IP is stopped after the 2 previous phases.
So, for all these reasons, I prefer the "Put a big TODO/HACK" option :)
Thank you,
Philippe
>
> Eric, Daniel,
>
> Fyi, this is another case where the panel-bridge stuff doesn't work so
> well. Not
> criticizing or anything, just pointing out :)
>
> Archit
>
>
>> + dw_mipi_dsi_disable(dsi);
>> + clk_disable_unprepare(dsi->pclk);
>> + pm_runtime_put(dsi->dev);
>> +}
>> +
>> +void dw_mipi_dsi_bridge_mode_set(struct drm_bridge *bridge,
>> + struct drm_display_mode *mode,
>> + struct drm_display_mode *adjusted_mode)
>> +{
>> + struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
>> + const struct dw_mipi_dsi_phy_ops *phy_ops = dsi->plat_data->phy_ops;
>> + void *priv_data = dsi->plat_data->priv_data;
>> + int ret;
>> +
>> + clk_prepare_enable(dsi->pclk);
>> +
>> + ret = phy_ops->get_lane_mbps(priv_data, mode, dsi->mode_flags,
>> + dsi->lanes, dsi->format, &dsi->lane_mbps);
>> + if (ret)
>> + DRM_DEBUG_DRIVER("Phy get_lane_mbps() failed\n");
>> +
>> + pm_runtime_get_sync(dsi->dev);
>> + dw_mipi_dsi_init(dsi);
>> + dw_mipi_dsi_dpi_config(dsi, mode);
>> + dw_mipi_dsi_packet_handler_config(dsi);
>> + dw_mipi_dsi_video_mode_config(dsi);
>> + dw_mipi_dsi_video_packet_config(dsi, mode);
>> + dw_mipi_dsi_command_mode_config(dsi);
>> + dw_mipi_dsi_line_timer_config(dsi, mode);
>> + dw_mipi_dsi_vertical_timing_config(dsi, mode);
>> +
>> + dw_mipi_dsi_dphy_init(dsi);
>> + dw_mipi_dsi_dphy_timing_config(dsi);
>> + dw_mipi_dsi_dphy_interface_config(dsi);
>> +
>> + dw_mipi_dsi_clear_err(dsi);
>> +
>> + ret = phy_ops->init(priv_data);
>> + if (ret)
>> + DRM_DEBUG_DRIVER("Phy init() failed\n");
>> +
>> + dw_mipi_dsi_dphy_enable(dsi);
>> +
>> + dw_mipi_dsi_wait_for_two_frames(mode);
>> +
>> + /* Switch to cmd mode for panel-bridge pre_enable & panel prepare */
>> + dw_mipi_dsi_set_mode(dsi, 0);
>> +}
>> +
>> +static void dw_mipi_dsi_bridge_enable(struct drm_bridge *bridge)
>> +{
>> + struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
>> +
>> + /* Switch to video mode for panel-bridge enable & panel enable */
>> + dw_mipi_dsi_set_mode(dsi, MIPI_DSI_MODE_VIDEO);
>> +}
>> +
>> +static enum drm_mode_status
>> +dw_mipi_dsi_bridge_mode_valid(struct drm_bridge *bridge,
>> + const struct drm_display_mode *mode)
>> +{
>> + struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
>> + const struct dw_mipi_dsi_plat_data *pdata = dsi->plat_data;
>> + enum drm_mode_status mode_status = MODE_OK;
>> +
>> + if (pdata->mode_valid)
>> + mode_status = pdata->mode_valid(pdata->priv_data, mode);
>> +
>> + return mode_status;
>> +}
>> +
>> +static int dw_mipi_dsi_bridge_attach(struct drm_bridge *bridge)
>> +{
>> + struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
>> +
>> + if (!bridge->encoder) {
>> + DRM_ERROR("Parent encoder object not found\n");
>> + return -ENODEV;
>> + }
>> +
>> + /* Set the encoder type as caller does not know it */
>> + bridge->encoder->encoder_type = DRM_MODE_ENCODER_DSI;
>> +
>> + /* Attach the panel-bridge to the dsi bridge */
>> + return drm_bridge_attach(bridge->encoder, dsi->panel_bridge,
>> bridge);
>> +}
>> +
>> +static struct drm_bridge_funcs dw_mipi_dsi_bridge_funcs = {
>> + .mode_set = dw_mipi_dsi_bridge_mode_set,
>> + .enable = dw_mipi_dsi_bridge_enable,
>> + .post_disable = dw_mipi_dsi_bridge_post_disable,
>> + .mode_valid = dw_mipi_dsi_bridge_mode_valid,
>> + .attach = dw_mipi_dsi_bridge_attach,
>> +};
>> +
>> +static struct dw_mipi_dsi *
>> +__dw_mipi_dsi_probe(struct platform_device *pdev,
>> + const struct dw_mipi_dsi_plat_data *plat_data)
>> +{
>> + struct device *dev = &pdev->dev;
>> + struct reset_control *apb_rst;
>> + struct dw_mipi_dsi *dsi;
>> + struct resource *res;
>> + int ret;
>> +
>> + dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
>> + if (!dsi)
>> + return ERR_PTR(-ENOMEM);
>> +
>> + dsi->dev = dev;
>> + dsi->plat_data = plat_data;
>> +
>> + if (!plat_data->phy_ops->init ||
>> !plat_data->phy_ops->get_lane_mbps) {
>> + DRM_ERROR("Phy not properly configured\n");
>> + return ERR_PTR(-ENODEV);
>> + }
>> +
>> + if (!plat_data->base) {
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> + if (!res)
>> + return ERR_PTR(-ENODEV);
>> +
>> + dsi->base = devm_ioremap_resource(dev, res);
>> + if (IS_ERR(dsi->base))
>> + return ERR_PTR(-ENODEV);
>> +
>> + } else {
>> + dsi->base = plat_data->base;
>> + }
>> +
>> + dsi->pclk = devm_clk_get(dev, "pclk");
>> + if (IS_ERR(dsi->pclk)) {
>> + ret = PTR_ERR(dsi->pclk);
>> + dev_err(dev, "Unable to get pclk: %d\n", ret);
>> + return ERR_PTR(ret);
>> + }
>> +
>> + /*
>> + * Note that the reset was not defined in the initial device
>> tree, so
>> + * we have to be prepared for it not being found.
>> + */
>> + apb_rst = devm_reset_control_get(dev, "apb");
>> + if (IS_ERR(apb_rst)) {
>> + ret = PTR_ERR(apb_rst);
>> + if (ret == -ENOENT) {
>> + apb_rst = NULL;
>> + } else {
>> + dev_err(dev, "Unable to get reset control: %d\n", ret);
>> + return ERR_PTR(ret);
>> + }
>> + }
>> +
>> + if (apb_rst) {
>> + ret = clk_prepare_enable(dsi->pclk);
>> + if (ret) {
>> + dev_err(dev, "%s: Failed to enable pclk\n", __func__);
>> + return ERR_PTR(ret);
>> + }
>> +
>> + reset_control_assert(apb_rst);
>> + usleep_range(10, 20);
>> + reset_control_deassert(apb_rst);
>> +
>> + clk_disable_unprepare(dsi->pclk);
>> + }
>> +
>> + pm_runtime_enable(dev);
>> +
>> + dsi->dsi_host.ops = &dw_mipi_dsi_host_ops;
>> + dsi->dsi_host.dev = dev;
>> + ret = mipi_dsi_host_register(&dsi->dsi_host);
>> + if (ret) {
>> + dev_err(dev, "Failed to register MIPI host: %d\n", ret);
>> + return ERR_PTR(ret);
>> + }
>> +
>> + dsi->bridge.driver_private = dsi;
>> + dsi->bridge.funcs = &dw_mipi_dsi_bridge_funcs;
>> +#ifdef CONFIG_OF
>> + dsi->bridge.of_node = pdev->dev.of_node;
>> +#endif
>> +
>> + dev_set_drvdata(dev, dsi);
>> +
>> + return dsi;
>> +}
>> +
>> +static void __dw_mipi_dsi_remove(struct dw_mipi_dsi *dsi)
>> +{
>> + pm_runtime_disable(dsi->dev);
>> +}
>> +
>> +/*
>> + * Probe/remove API, used from platforms based on the DRM bridge API.
>> + */
>> +int dw_mipi_dsi_probe(struct platform_device *pdev,
>> + const struct dw_mipi_dsi_plat_data *plat_data)
>> +{
>> + struct dw_mipi_dsi *dsi;
>> +
>> + dsi = __dw_mipi_dsi_probe(pdev, plat_data);
>> + if (IS_ERR(dsi))
>> + return PTR_ERR(dsi);
>> +
>> + return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(dw_mipi_dsi_probe);
>> +
>> +void dw_mipi_dsi_remove(struct platform_device *pdev)
>> +{
>> + struct dw_mipi_dsi *dsi = platform_get_drvdata(pdev);
>> +
>> + mipi_dsi_host_unregister(&dsi->dsi_host);
>> +
>> + __dw_mipi_dsi_remove(dsi);
>> +}
>> +EXPORT_SYMBOL_GPL(dw_mipi_dsi_remove);
>> +
>> +/*
>> + * Bind/unbind API, used from platforms based on the component
>> framework.
>> + */
>> +int dw_mipi_dsi_bind(struct platform_device *pdev, struct drm_encoder
>> *encoder,
>> + const struct dw_mipi_dsi_plat_data *plat_data)
>> +{
>> + struct dw_mipi_dsi *dsi;
>> + int ret;
>> +
>> + dsi = __dw_mipi_dsi_probe(pdev, plat_data);
>> + if (IS_ERR(dsi))
>> + return PTR_ERR(dsi);
>> +
>> + ret = drm_bridge_attach(encoder, &dsi->bridge, NULL);
>> + if (ret) {
>> + dw_mipi_dsi_remove(pdev);
>> + DRM_ERROR("Failed to initialize bridge with drm\n");
>> + return ret;
>> + }
>> +
>> + return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(dw_mipi_dsi_bind);
>> +
>> +void dw_mipi_dsi_unbind(struct device *dev)
>> +{
>> + struct dw_mipi_dsi *dsi = dev_get_drvdata(dev);
>> +
>> + __dw_mipi_dsi_remove(dsi);
>> +}
>> +EXPORT_SYMBOL_GPL(dw_mipi_dsi_unbind);
>> +
>> +MODULE_AUTHOR("Chris Zhong <zyw@xxxxxxxxxxxxxx>");
>> +MODULE_AUTHOR("Philippe Cornu <philippe.cornu@xxxxxx>");
>> +MODULE_DESCRIPTION("DW MIPI DSI host controller driver");
>> +MODULE_LICENSE("GPL");
>> +MODULE_ALIAS("platform:dw-mipi-dsi");
>> diff --git a/include/drm/bridge/dw_mipi_dsi.h
>> b/include/drm/bridge/dw_mipi_dsi.h
>> new file mode 100644
>> index 0000000..9b30fec
>> --- /dev/null
>> +++ b/include/drm/bridge/dw_mipi_dsi.h
>> @@ -0,0 +1,39 @@
>> +/*
>> + * Copyright (C) STMicroelectronics SA 2017
>> + *
>> + * Authors: Philippe Cornu <philippe.cornu@xxxxxx>
>> + * Yannick Fertre <yannick.fertre@xxxxxx>
>> + *
>> + * License terms: GNU General Public License (GPL), version 2
>> + */
>> +
>> +#ifndef __DW_MIPI_DSI__
>> +#define __DW_MIPI_DSI__
>> +
>> +struct dw_mipi_dsi_phy_ops {
>> + int (*init)(void *priv_data);
>> + int (*get_lane_mbps)(void *priv_data, struct drm_display_mode *mode,
>> + unsigned long mode_flags, u32 lanes, u32 format,
>> + unsigned int *lane_mbps);
>> +};
>> +
>> +struct dw_mipi_dsi_plat_data {
>> + void __iomem *base;
>> + unsigned int max_data_lanes;
>> +
>> + enum drm_mode_status (*mode_valid)(void *priv_data,
>> + const struct drm_display_mode *mode);
>> +
>> + const struct dw_mipi_dsi_phy_ops *phy_ops;
>> +
>> + void *priv_data;
>> +};
>> +
>> +int dw_mipi_dsi_probe(struct platform_device *pdev,
>> + const struct dw_mipi_dsi_plat_data *plat_data);
>> +void dw_mipi_dsi_remove(struct platform_device *pdev);
>> +int dw_mipi_dsi_bind(struct platform_device *pdev, struct drm_encoder
>> *encoder,
>> + const struct dw_mipi_dsi_plat_data *plat_data);
>> +void dw_mipi_dsi_unbind(struct device *dev);
>> +
>> +#endif /* __DW_MIPI_DSI__ */
>>
>
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