Hi Biju,
Thank you for the patch.
On Mon, Aug 29, 2022 at 10:19:01AM +0100, Biju Das wrote:
> This driver supports the MIPI DSI encoder found in the RZ/G2L
> SoC. It currently supports DSI video mode only.
>
> Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
> Acked-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
> ---
> v5->v6:
> * Updated commit description
> * Moved handling of arst and prst from rzg2l_mipi_dsi_startup->runtime
> PM suspend/resume handlers.
> * Max lane capability read at probe(), and enforced in
> rzg2l_mipi_dsi_host_attach()
> * Simplified vich1ppsetr setting.
> * Renamed hsclk_running_mode,hsclk_mode->is_clk_cont.
> * Fixed typo in probe error message(arst->rst).
> * Reordered DRM bridge initaization in probe()
> * Updated typo in e-mail address.
> v4->v5:
> * Added Ack from Sam.
> * Added a trivial change, replaced rzg2l_mipi_dsi_parse_dt()
> with drm_of_get_data_lanes_count_ep() in probe.
> v3->v4:
> * Updated error handling in rzg2l_mipi_dsi_startup() and rzg2l_mipi_dsi_atomic_enable()
> v2->v3:
> * pass rzg2l_mipi_dsi pointer to {Link,Phy} register rd/wr function instead
> of the memory pointer
> * Fixed the comment in rzg2l_mipi_dsi_startup()
> * Removed unnecessary dbg message from rzg2l_mipi_dsi_start_video()
> * DRM bridge parameter initialization moved to probe
> * Replaced dev_dbg->dev_err in rzg2l_mipi_dsi_parse_dt()
> * Inserted the missing blank lane after return in probe()
> * Added missing MODULE_DEVICE_TABLE
> * Added include linux/bits.h in header file
> * Fixed various macros in header file.
> * Reorder the make file for DSI, so that it is no more dependent
> on RZ/G2L DU patch series.
> v1->v2:
> * Rework based on dt-binding change (DSI + D-PHY) as single block
> * Replaced link_mmio and phy_mmio with mmio in struct rzg2l_mipi_dsi
> * Replaced rzg2l_mipi_phy_write with rzg2l_mipi_dsi_phy_write
> and rzg2l_mipi_dsi_link_write
> * Replaced rzg2l_mipi_phy_read->rzg2l_mipi_dsi_link_read
> RFC->v1:
> * Added "depends on ARCH_RENESAS || COMPILE_TEST" on KCONFIG
> and dropped DRM as it is implied by DRM_BRIDGE
> * Used devm_reset_control_get_exclusive() for reset handle
> * Removed bool hsclkmode from struct rzg2l_mipi_dsi
> * Added error check for pm, using pm_runtime_resume_and_get() instead of
> pm_runtime_get_sync()
> * Added check for unsupported formats in rzg2l_mipi_dsi_host_attach()
> * Avoided read-modify-write stopping hsclock
> * Used devm_platform_ioremap_resource for resource allocation
> * Removed unnecessary assert call from probe and remove.
> * wrap the line after the PTR_ERR() in probe()
> * Updated reset failure messages in probe
> * Fixed the typo arstc->prstc
> * Made hex constants to lower case.
> RFC:
> * https://patchwork.kernel.org/project/linux-renesas-soc/patch/20220112174612.10773-23-biju.das.jz@xxxxxxxxxxxxxx/
> ---
> drivers/gpu/drm/rcar-du/Kconfig | 8 +
> drivers/gpu/drm/rcar-du/Makefile | 2 +
> drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi.c | 703 ++++++++++++++++++
> drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi_regs.h | 151 ++++
> 4 files changed, 864 insertions(+)
> create mode 100644 drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi.c
> create mode 100644 drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi_regs.h
>
> diff --git a/drivers/gpu/drm/rcar-du/Kconfig b/drivers/gpu/drm/rcar-du/Kconfig
> index c959e8c6be7d..58ffb8c2443b 100644
> --- a/drivers/gpu/drm/rcar-du/Kconfig
> +++ b/drivers/gpu/drm/rcar-du/Kconfig
> @@ -51,6 +51,14 @@ config DRM_RCAR_MIPI_DSI
> help
> Enable support for the R-Car Display Unit embedded MIPI DSI encoders.
>
> +config DRM_RZG2L_MIPI_DSI
> + tristate "RZ/G2L MIPI DSI Encoder Support"
> + depends on DRM_BRIDGE && OF
> + depends on ARCH_RENESAS || COMPILE_TEST
> + select DRM_MIPI_DSI
> + help
> + Enable support for the RZ/G2L Display Unit embedded MIPI DSI encoders.
> +
> config DRM_RCAR_VSP
> bool "R-Car DU VSP Compositor Support" if ARM
> default y if ARM64
> diff --git a/drivers/gpu/drm/rcar-du/Makefile b/drivers/gpu/drm/rcar-du/Makefile
> index 6f132325c8b7..b8f2c82651d9 100644
> --- a/drivers/gpu/drm/rcar-du/Makefile
> +++ b/drivers/gpu/drm/rcar-du/Makefile
> @@ -14,3 +14,5 @@ obj-$(CONFIG_DRM_RCAR_DU) += rcar-du-drm.o
> obj-$(CONFIG_DRM_RCAR_DW_HDMI) += rcar_dw_hdmi.o
> obj-$(CONFIG_DRM_RCAR_LVDS) += rcar_lvds.o
> obj-$(CONFIG_DRM_RCAR_MIPI_DSI) += rcar_mipi_dsi.o
> +
> +obj-$(CONFIG_DRM_RZG2L_MIPI_DSI) += rzg2l_mipi_dsi.o
> diff --git a/drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi.c b/drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi.c
> new file mode 100644
> index 000000000000..46a71e39e336
> --- /dev/null
> +++ b/drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi.c
> @@ -0,0 +1,703 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * RZ/G2L MIPI DSI Encoder Driver
> + *
> + * Copyright (C) 2022 Renesas Electronics Corporation
> + */
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/io.h>
> +#include <linux/iopoll.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/of_graph.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/reset.h>
> +#include <linux/slab.h>
> +
> +#include <drm/drm_atomic.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_bridge.h>
> +#include <drm/drm_mipi_dsi.h>
> +#include <drm/drm_of.h>
> +#include <drm/drm_panel.h>
> +#include <drm/drm_probe_helper.h>
> +
> +#include "rzg2l_mipi_dsi_regs.h"
> +
> +struct rzg2l_mipi_dsi {
> + struct device *dev;
> + void __iomem *mmio;
> +
> + struct reset_control *rstc;
> + struct reset_control *arstc;
> + struct reset_control *prstc;
> +
> + struct mipi_dsi_host host;
> + struct drm_bridge bridge;
> + struct drm_bridge *next_bridge;
> +
> + struct clk *vclk;
> +
> + enum mipi_dsi_pixel_format format;
> + unsigned int num_data_lanes;
> + unsigned int max_lanes;
> + unsigned int lanes;
> + unsigned long mode_flags;
> +};
> +
> +static inline struct rzg2l_mipi_dsi *
> +bridge_to_rzg2l_mipi_dsi(struct drm_bridge *bridge)
> +{
> + return container_of(bridge, struct rzg2l_mipi_dsi, bridge);
> +}
> +
> +static inline struct rzg2l_mipi_dsi *
> +host_to_rzg2l_mipi_dsi(struct mipi_dsi_host *host)
> +{
> + return container_of(host, struct rzg2l_mipi_dsi, host);
> +}
> +
> +static void rzg2l_mipi_dsi_phy_write(struct rzg2l_mipi_dsi *dsi, u32 reg, u32 data)
> +{
> + iowrite32(data, dsi->mmio + reg);
> +}
> +
> +static void rzg2l_mipi_dsi_link_write(struct rzg2l_mipi_dsi *dsi, u32 reg, u32 data)
> +{
> + iowrite32(data, dsi->mmio + LINK_REG_OFFSET + reg);
> +}
> +
> +static u32 rzg2l_mipi_dsi_link_read(struct rzg2l_mipi_dsi *dsi, u32 reg)
> +{
> + return ioread32(dsi->mmio + LINK_REG_OFFSET + reg);
> +}
> +
> +/* -----------------------------------------------------------------------------
> + * Hardware Setup
> + */
> +
> +static int rzg2l_mipi_dsi_startup(struct rzg2l_mipi_dsi *dsi,
> + const struct drm_display_mode *mode)
> +{
> + unsigned long hsfreq;
> + u32 txsetr;
> + u32 clstptsetr;
> + u32 lptrnstsetr;
> + u32 clkkpt;
> + u32 clkbfht;
> + u32 clkstpt;
> + u32 golpbkt;
> + unsigned int bpp;
> + struct {
> + u32 tclk_miss;
> + u32 t_init;
> + u32 tclk_prepare;
> + u32 tclk_settle;
> + u32 tclk_trail;
> + u32 tclk_post;
> + u32 tclk_pre;
> + u32 tclk_zero;
> + u32 tlpx;
> + u32 ths_prepare;
> + u32 ths_settle;
> + u32 ths_exit;
> + u32 ths_trail;
> + u32 ths_zero;
> + } timings;
> + u32 dphyctrl0;
> + u32 dphytim0;
> + u32 dphytim1;
> + u32 dphytim2;
> + u32 dphytim3;
> + int ret;
> +
> + /*
> + * Relationship between hsclk and vclk must follow
> + * vclk * bpp = hsclk * 8 * lanes
> + * where vclk: video clock (Hz)
> + * bpp: video pixel bit depth
> + * hsclk: DSI HS Byte clock frequency (Hz)
> + * lanes: number of data lanes
> + *
> + * hsclk(bit) = hsclk(byte) * 8
> + */
> + bpp = mipi_dsi_pixel_format_to_bpp(dsi->format);
> + hsfreq = (mode->clock * bpp * 8) / (8 * dsi->lanes);
> +
> + /* All DSI global operation timings are set with recommended setting */
> + if (hsfreq > 250000) {
> + timings.tclk_miss = 1;
> + timings.t_init = 79801;
> + timings.tclk_prepare = 8;
> + timings.tclk_settle = 9;
> + timings.tclk_trail = 7;
> + timings.tclk_post = 35;
> + timings.tclk_pre = 4;
> + timings.tclk_zero = 33;
> + timings.tlpx = 6;
> + timings.ths_prepare = 9;
> + timings.ths_settle = 9;
> + timings.ths_exit = 13;
> + timings.ths_trail = 9;
> + timings.ths_zero = 16;
> + } else {
> + timings.tclk_miss = 1;
> + timings.t_init = 79801;
> + timings.tclk_prepare = 8;
> + timings.tclk_settle = 9;
> + timings.tclk_trail = 10;
> + timings.tclk_post = 94;
> + timings.tclk_pre = 13;
> + timings.tclk_zero = 33;
> + timings.tlpx = 6;
> + timings.ths_prepare = 12;
> + timings.ths_settle = 9;
> + timings.ths_exit = 13;
> + timings.ths_trail = 17;
> + timings.ths_zero = 23;
> + }
> +
> + ret = pm_runtime_resume_and_get(dsi->dev);
> + if (ret < 0)
> + return ret;
> +
> + clk_set_rate(dsi->vclk, mode->clock * 1000);
> +
> + /* Initializing DPHY before accessing LINK */
> + dphyctrl0 = DSIDPHYCTRL0_CAL_EN_HSRX_OFS | DSIDPHYCTRL0_CMN_MASTER_EN |
> + DSIDPHYCTRL0_RE_VDD_DETVCCQLV18 | DSIDPHYCTRL0_EN_BGR;
> +
> + rzg2l_mipi_dsi_phy_write(dsi, DSIDPHYCTRL0, dphyctrl0);
> + usleep_range(20, 30);
> +
> + dphyctrl0 |= DSIDPHYCTRL0_EN_LDO1200;
> + rzg2l_mipi_dsi_phy_write(dsi, DSIDPHYCTRL0, dphyctrl0);
> + usleep_range(10, 20);
> +
> + dphytim0 = DSIDPHYTIM0_TCLK_MISS(timings.tclk_miss) |
> + DSIDPHYTIM0_T_INIT(timings.t_init);
> + dphytim1 = DSIDPHYTIM1_THS_PREPARE(timings.ths_prepare) |
> + DSIDPHYTIM1_TCLK_PREPARE(timings.tclk_prepare) |
> + DSIDPHYTIM1_THS_SETTLE(timings.ths_settle) |
> + DSIDPHYTIM1_TCLK_SETTLE(timings.tclk_settle);
> + dphytim2 = DSIDPHYTIM2_TCLK_TRAIL(timings.tclk_trail) |
> + DSIDPHYTIM2_TCLK_POST(timings.tclk_post) |
> + DSIDPHYTIM2_TCLK_PRE(timings.tclk_pre) |
> + DSIDPHYTIM2_TCLK_ZERO(timings.tclk_zero);
> + dphytim3 = DSIDPHYTIM3_TLPX(timings.tlpx) |
> + DSIDPHYTIM3_THS_EXIT(timings.ths_exit) |
> + DSIDPHYTIM3_THS_TRAIL(timings.ths_trail) |
> + DSIDPHYTIM3_THS_ZERO(timings.ths_zero);
> +
> + rzg2l_mipi_dsi_phy_write(dsi, DSIDPHYTIM0, dphytim0);
> + rzg2l_mipi_dsi_phy_write(dsi, DSIDPHYTIM1, dphytim1);
> + rzg2l_mipi_dsi_phy_write(dsi, DSIDPHYTIM2, dphytim2);
> + rzg2l_mipi_dsi_phy_write(dsi, DSIDPHYTIM3, dphytim3);
> +
> + ret = reset_control_deassert(dsi->rstc);
> + if (ret < 0)
> + goto err_rstc;
> +
> + udelay(1);
> +
> + /* Enable Data lanes and Clock lanes */
> + txsetr = TXSETR_DLEN | TXSETR_NUMLANEUSE(dsi->lanes - 1) | TXSETR_CLEN;
> + rzg2l_mipi_dsi_link_write(dsi, TXSETR, txsetr);
> +
> + /*
> + * Global timings characteristic depends on high speed Clock Frequency
> + * Currently MIPI DSI-IF just supports maximum FHD@60 with:
> + * - videoclock = 148.5 (MHz)
> + * - bpp: maximum 24bpp
> + * - data lanes: maximum 4 lanes
> + * Therefore maximum hsclk will be 891 Mbps.
> + */
> + if (hsfreq > 445500) {
> + clkkpt = 12;
> + clkbfht = 15;
> + clkstpt = 48;
> + golpbkt = 75;
> + } else if (hsfreq > 250000) {
> + clkkpt = 7;
> + clkbfht = 8;
> + clkstpt = 27;
> + golpbkt = 40;
> + } else {
> + clkkpt = 8;
> + clkbfht = 6;
> + clkstpt = 24;
> + golpbkt = 29;
> + }
> +
> + clstptsetr = CLSTPTSETR_CLKKPT(clkkpt) | CLSTPTSETR_CLKBFHT(clkbfht) |
> + CLSTPTSETR_CLKSTPT(clkstpt);
> + rzg2l_mipi_dsi_link_write(dsi, CLSTPTSETR, clstptsetr);
> +
> + lptrnstsetr = LPTRNSTSETR_GOLPBKT(golpbkt);
> + rzg2l_mipi_dsi_link_write(dsi, LPTRNSTSETR, lptrnstsetr);
> +
> + return 0;
> +
> +err_rstc:
> + pm_runtime_put(dsi->dev);
> +
> + return ret;
> +}
> +
> +static void rzg2l_mipi_dsi_set_display_timing(struct rzg2l_mipi_dsi *dsi,
> + const struct drm_display_mode *mode)
> +{
> + u32 vich1ppsetr;
> + u32 vich1vssetr;
> + u32 vich1vpsetr;
> + u32 vich1hssetr;
> + u32 vich1hpsetr;
> + int dsi_format;
> + u32 delay[2];
> + u8 index;
> +
> + /* Configuration for Pixel Packet */
> + dsi_format = mipi_dsi_pixel_format_to_bpp(dsi->format);
> + switch (dsi_format) {
> + case 24:
> + vich1ppsetr = VICH1PPSETR_DT_RGB24;
> + break;
> + case 18:
> + vich1ppsetr = VICH1PPSETR_DT_RGB18;
> + break;
> + }
> +
> + if ((dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) &&
> + !(dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST))
> + vich1ppsetr |= VICH1PPSETR_TXESYNC_PULSE;
> +
> + rzg2l_mipi_dsi_link_write(dsi, VICH1PPSETR, vich1ppsetr);
> +
> + /* Configuration for Video Parameters */
> + vich1vssetr = VICH1VSSETR_VACTIVE(mode->vdisplay) |
> + VICH1VSSETR_VSA(mode->vsync_end - mode->vsync_start);
> + vich1vssetr |= (mode->flags & DRM_MODE_FLAG_PVSYNC) ?
> + VICH1VSSETR_VSPOL_HIGH : VICH1VSSETR_VSPOL_LOW;
> +
> + vich1vpsetr = VICH1VPSETR_VFP(mode->vsync_start - mode->vdisplay) |
> + VICH1VPSETR_VBP(mode->vtotal - mode->vsync_end);
> +
> + vich1hssetr = VICH1HSSETR_HACTIVE(mode->hdisplay) |
> + VICH1HSSETR_HSA(mode->hsync_end - mode->hsync_start);
> + vich1hssetr |= (mode->flags & DRM_MODE_FLAG_PHSYNC) ?
> + VICH1HSSETR_HSPOL_HIGH : VICH1HSSETR_HSPOL_LOW;
> +
> + vich1hpsetr = VICH1HPSETR_HFP(mode->hsync_start - mode->hdisplay) |
> + VICH1HPSETR_HBP(mode->htotal - mode->hsync_end);
> +
> + rzg2l_mipi_dsi_link_write(dsi, VICH1VSSETR, vich1vssetr);
> + rzg2l_mipi_dsi_link_write(dsi, VICH1VPSETR, vich1vpsetr);
> + rzg2l_mipi_dsi_link_write(dsi, VICH1HSSETR, vich1hssetr);
> + rzg2l_mipi_dsi_link_write(dsi, VICH1HPSETR, vich1hpsetr);
> +
> + /*
> + * Configuration for Delay Value
> + * Delay value based on 2 ranges of video clock.
> + * 74.25MHz is videoclock of HD@60p or FHD@30p
> + */
> + if (mode->clock > 74250) {
> + delay[0] = 231;
> + delay[1] = 216;
> + } else {
> + delay[0] = 220;
> + delay[1] = 212;
> + }
> +
> + if (dsi->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS)
> + index = 0;
> + else
> + index = 1;
> +
> + rzg2l_mipi_dsi_link_write(dsi, VICH1SET1R,
> + VICH1SET1R_DLY(delay[index]));
> +}
> +
> +static int rzg2l_mipi_dsi_start_hs_clock(struct rzg2l_mipi_dsi *dsi)
> +{
> + bool is_clk_cont;
> + u32 hsclksetr;
> + u32 status;
> + int ret;
> +
> + is_clk_cont = !(dsi->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS);
> +
> + /* Start HS clock */
> + hsclksetr = HSCLKSETR_HSCLKRUN_HS | (is_clk_cont ?
> + HSCLKSETR_HSCLKMODE_CONT :
> + HSCLKSETR_HSCLKMODE_NON_CONT);
> + rzg2l_mipi_dsi_link_write(dsi, HSCLKSETR, hsclksetr);
> +
> + if (is_clk_cont) {
> + ret = read_poll_timeout(rzg2l_mipi_dsi_link_read, status,
> + status & PLSR_CLLP2HS,
> + 2000, 20000, false, dsi, PLSR);
> + if (ret < 0) {
> + dev_err(dsi->dev, "failed to start HS clock\n");
> + return ret;
> + }
> + }
> +
> + dev_dbg(dsi->dev, "Start High Speed Clock with %s clock mode",
> + is_clk_cont ? "continuous" : "non-continuous");
> +
> + return 0;
> +}
> +
> +static int rzg2l_mipi_dsi_stop_hs_clock(struct rzg2l_mipi_dsi *dsi)
> +{
> + bool is_clk_cont;
> + u32 status;
> + int ret;
> +
> + is_clk_cont = !(dsi->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS);
> +
> + /* Stop HS clock */
> + rzg2l_mipi_dsi_link_write(dsi, HSCLKSETR,
> + is_clk_cont ? HSCLKSETR_HSCLKMODE_CONT :
> + HSCLKSETR_HSCLKMODE_NON_CONT);
> +
> + if (is_clk_cont) {
> + ret = read_poll_timeout(rzg2l_mipi_dsi_link_read, status,
> + status & PLSR_CLHS2LP,
> + 2000, 20000, false, dsi, PLSR);
> + if (ret < 0) {
> + dev_err(dsi->dev, "failed to stop HS clock\n");
> + return ret;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static int rzg2l_mipi_dsi_start_video(struct rzg2l_mipi_dsi *dsi)
> +{
> + u32 vich1set0r;
> + u32 status;
> + int ret;
> +
> + /* Configuration for Blanking sequence and start video input*/
> + vich1set0r = VICH1SET0R_HFPNOLP | VICH1SET0R_HBPNOLP |
> + VICH1SET0R_HSANOLP | VICH1SET0R_VSTART;
> + rzg2l_mipi_dsi_link_write(dsi, VICH1SET0R, vich1set0r);
> +
> + ret = read_poll_timeout(rzg2l_mipi_dsi_link_read, status,
> + status & VICH1SR_VIRDY,
> + 2000, 20000, false, dsi, VICH1SR);
> + if (ret < 0)
> + dev_err(dsi->dev, "Failed to start video signal input\n");
> +
> + return ret;
> +}
> +
> +static int rzg2l_mipi_dsi_stop_video(struct rzg2l_mipi_dsi *dsi)
> +{
> + u32 status;
> + int ret;
> +
> + rzg2l_mipi_dsi_link_write(dsi, VICH1SET0R, VICH1SET0R_VSTPAFT);
> + ret = read_poll_timeout(rzg2l_mipi_dsi_link_read, status,
> + (status & VICH1SR_STOP) && (!(status & VICH1SR_RUNNING)),
> + 2000, 20000, false, dsi, VICH1SR);
> + if (ret < 0)
> + goto err;
> +
> + ret = read_poll_timeout(rzg2l_mipi_dsi_link_read, status,
> + !(status & LINKSR_HSBUSY),
> + 2000, 20000, false, dsi, LINKSR);
> + if (ret < 0)
> + goto err;
> +
> + return 0;
> +
> +err:
> + dev_err(dsi->dev, "Failed to stop video signal input\n");
> + return ret;
> +}
> +
> +/* -----------------------------------------------------------------------------
> + * Bridge
> + */
> +
> +static int rzg2l_mipi_dsi_attach(struct drm_bridge *bridge,
> + enum drm_bridge_attach_flags flags)
> +{
> + struct rzg2l_mipi_dsi *dsi = bridge_to_rzg2l_mipi_dsi(bridge);
> +
> + return drm_bridge_attach(bridge->encoder, dsi->next_bridge, bridge,
> + flags);
> +}
> +
> +static void rzg2l_mipi_dsi_atomic_enable(struct drm_bridge *bridge,
> + struct drm_bridge_state *old_bridge_state)
> +{
> + struct drm_atomic_state *state = old_bridge_state->base.state;
> + struct rzg2l_mipi_dsi *dsi = bridge_to_rzg2l_mipi_dsi(bridge);
> + const struct drm_display_mode *mode;
> + struct drm_connector *connector;
> + struct drm_crtc *crtc;
> + int ret;
> +
> + connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
> + crtc = drm_atomic_get_new_connector_state(state, connector)->crtc;
> + mode = &drm_atomic_get_new_crtc_state(state, crtc)->adjusted_mode;
> +
> + ret = rzg2l_mipi_dsi_startup(dsi, mode);
> + if (ret < 0)
> + return;
> +
> + rzg2l_mipi_dsi_set_display_timing(dsi, mode);
> +
> + ret = rzg2l_mipi_dsi_start_hs_clock(dsi);
> + if (ret < 0)
> + goto err_hs_clock;
> +
> + ret = rzg2l_mipi_dsi_start_video(dsi);
> + if (ret < 0)
> + goto err_video;
> +
> + return;
> +
> +err_video:
> + rzg2l_mipi_dsi_stop_hs_clock(dsi);
> +err_hs_clock:
> + reset_control_assert(dsi->rstc);
> + pm_runtime_put(dsi->dev);
A function that wraps those two calls would be nice, you could call it
here and in rzg2l_mipi_dsi_atomic_disable(). It would be the counterpart
of rzg2l_mipi_dsi_startup(), the same way you have
rzg2l_mipi_dsi_start_hs_clock() vs. rzg2l_mipi_dsi_stop_hs_clock() and
rzg2l_mipi_dsi_stop_video() vs. rzg2l_mipi_dsi_start_video().
> +}
> +
> +static void rzg2l_mipi_dsi_atomic_disable(struct drm_bridge *bridge,
> + struct drm_bridge_state *old_bridge_state)
> +{
> + struct rzg2l_mipi_dsi *dsi = bridge_to_rzg2l_mipi_dsi(bridge);
> +
> + rzg2l_mipi_dsi_stop_video(dsi);
> + rzg2l_mipi_dsi_stop_hs_clock(dsi);
> + reset_control_assert(dsi->rstc);
> + pm_runtime_put(dsi->dev);
> +}
> +
> +static enum drm_mode_status
> +rzg2l_mipi_dsi_bridge_mode_valid(struct drm_bridge *bridge,
> + const struct drm_display_info *info,
> + const struct drm_display_mode *mode)
> +{
> + if (mode->clock > 148500)
> + return MODE_CLOCK_HIGH;
> +
> + return MODE_OK;
> +}
> +
> +static const struct drm_bridge_funcs rzg2l_mipi_dsi_bridge_ops = {
> + .attach = rzg2l_mipi_dsi_attach,
> + .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,
> + .atomic_enable = rzg2l_mipi_dsi_atomic_enable,
> + .atomic_disable = rzg2l_mipi_dsi_atomic_disable,
> + .mode_valid = rzg2l_mipi_dsi_bridge_mode_valid,
> +};
> +
> +/* -----------------------------------------------------------------------------
> + * Host setting
> + */
> +
> +static int rzg2l_mipi_dsi_host_attach(struct mipi_dsi_host *host,
> + struct mipi_dsi_device *device)
> +{
> + struct rzg2l_mipi_dsi *dsi = host_to_rzg2l_mipi_dsi(host);
> + int ret;
> +
> + if (dsi->max_lanes < dsi->lanes || device->lanes > dsi->num_data_lanes) {
> + dev_err(dsi->dev, "Invalid lanes");
> + return -EINVAL;
> + }
> +
> + switch (mipi_dsi_pixel_format_to_bpp(device->format)) {
> + case 24:
> + case 18:
> + break;
> + default:
> + dev_warn(dsi->dev, "unsupported format");
> + return -EINVAL;
> + }
> +
> + dsi->lanes = device->lanes;
> + dsi->format = device->format;
> + dsi->mode_flags = device->mode_flags;
> +
> + dsi->next_bridge = devm_drm_of_get_bridge(dsi->dev, dsi->dev->of_node,
> + 1, 0);
> + if (IS_ERR(dsi->next_bridge)) {
> + ret = PTR_ERR(dsi->next_bridge);
> + dev_err(dsi->dev, "failed to get next bridge: %d\n", ret);
> + return ret;
> + }
> +
> + drm_bridge_add(&dsi->bridge);
> +
> + return 0;
> +}
> +
> +static int rzg2l_mipi_dsi_host_detach(struct mipi_dsi_host *host,
> + struct mipi_dsi_device *device)
> +{
> + struct rzg2l_mipi_dsi *dsi = host_to_rzg2l_mipi_dsi(host);
> +
> + drm_bridge_remove(&dsi->bridge);
> +
> + return 0;
> +}
> +
> +static const struct mipi_dsi_host_ops rzg2l_mipi_dsi_host_ops = {
> + .attach = rzg2l_mipi_dsi_host_attach,
> + .detach = rzg2l_mipi_dsi_host_detach,
> +};
> +
> +/* -----------------------------------------------------------------------------
> + * Power Management
> + */
> +
> +static int __maybe_unused rzg2l_mipi_pm_runtime_suspend(struct device *dev)
> +{
> + struct rzg2l_mipi_dsi *dsi = dev_get_drvdata(dev);
> +
> + reset_control_assert(dsi->prstc);
> + reset_control_assert(dsi->arstc);
> +
> + return 0;
> +}
> +
> +static int __maybe_unused rzg2l_mipi_pm_runtime_resume(struct device *dev)
> +{
> + struct rzg2l_mipi_dsi *dsi = dev_get_drvdata(dev);
> + int ret;
> +
> + ret = reset_control_deassert(dsi->arstc);
> + if (ret < 0)
> + return ret;
> +
> + ret = reset_control_deassert(dsi->prstc);
> + if (ret < 0)
> + reset_control_assert(dsi->arstc);
> +
> + return ret;
> +}
> +
> +static const struct dev_pm_ops rzg2l_mipi_pm_ops = {
> + SET_RUNTIME_PM_OPS(rzg2l_mipi_pm_runtime_suspend, rzg2l_mipi_pm_runtime_resume, NULL)
> +};
> +
> +/* -----------------------------------------------------------------------------
> + * Probe & Remove
> + */
> +
> +static int rzg2l_mipi_dsi_probe(struct platform_device *pdev)
> +{
> + struct rzg2l_mipi_dsi *dsi;
> + int ret;
> +
> + dsi = devm_kzalloc(&pdev->dev, sizeof(*dsi), GFP_KERNEL);
> + if (!dsi)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, dsi);
> + dsi->dev = &pdev->dev;
> +
> + ret = drm_of_get_data_lanes_count_ep(dsi->dev->of_node, 1, 0, 1, 4);
> + if (ret < 0)
> + return dev_err_probe(dsi->dev, ret,
> + "missing or invalid data-lanes property\n");
> +
> + dsi->num_data_lanes = ret;
I would store this in a local num_data_lanes variable, and ...
> +
> + dsi->mmio = devm_platform_ioremap_resource(pdev, 0);
> + if (IS_ERR(dsi->mmio))
> + return PTR_ERR(dsi->mmio);
> +
> + dsi->vclk = devm_clk_get(dsi->dev, "vclk");
> + if (IS_ERR(dsi->vclk))
> + return PTR_ERR(dsi->vclk);
> +
> + dsi->rstc = devm_reset_control_get_exclusive(dsi->dev, "rst");
> + if (IS_ERR(dsi->rstc))
> + return dev_err_probe(dsi->dev, PTR_ERR(dsi->rstc),
> + "failed to get rst\n");
> +
> + dsi->arstc = devm_reset_control_get_exclusive(dsi->dev, "arst");
> + if (IS_ERR(dsi->arstc))
> + return dev_err_probe(&pdev->dev, PTR_ERR(dsi->arstc),
> + "failed to get arst\n");
> +
> + dsi->prstc = devm_reset_control_get_exclusive(dsi->dev, "prst");
> + if (IS_ERR(dsi->prstc))
> + return dev_err_probe(dsi->dev, PTR_ERR(dsi->prstc),
> + "failed to get prst\n");
> +
> + platform_set_drvdata(pdev, dsi);
> +
> + pm_runtime_enable(dsi->dev);
> +
> + ret = pm_runtime_resume_and_get(dsi->dev);
> + if (ret < 0)
> + return ret;
This should be goto out_pm_get, and the label should be renamed to
out_pm_disable (or just out_pm). Error labels should be named according
to what cleanup operation they perform, not the error that they handle.
There are a few error labels above that should also be renamed
accordingly.
> +
> + dsi->max_lanes = ((rzg2l_mipi_dsi_link_read(dsi, TXSETR) >> 16) & 0x3) + 1;
... here write
dsi->max_lanes = min(((rzg2l_mipi_dsi_link_read(dsi, TXSETR) >> 16) & 3) + 1,
num_data_lanes);
to drop the num_data_lanes field from the rzg2l_mipi_dsi structure. You
could also use a local variable to store the register value in order to
shorten lines:
txsetr = rzg2l_mipi_dsi_link_read(dsi, TXSETR);
dsi->max_lanes = min(((txsetr >> 16) & 3) + 1, num_data_lanes);
Up to you.
All those changes are fairly small, once addressed,
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
> + pm_runtime_put(dsi->dev);
> +
> + /* Initialize the DRM bridge. */
> + dsi->bridge.funcs = &rzg2l_mipi_dsi_bridge_ops;
> + dsi->bridge.of_node = dsi->dev->of_node;
> +
> + /* Init host device */
> + dsi->host.dev = dsi->dev;
> + dsi->host.ops = &rzg2l_mipi_dsi_host_ops;
> + ret = mipi_dsi_host_register(&dsi->host);
> + if (ret < 0)
> + goto out_pm_get;
> +
> + return 0;
> +
> +out_pm_get:
> + pm_runtime_disable(dsi->dev);
> + return ret;
> +}
> +
> +static int rzg2l_mipi_dsi_remove(struct platform_device *pdev)
> +{
> + struct rzg2l_mipi_dsi *dsi = platform_get_drvdata(pdev);
> +
> + mipi_dsi_host_unregister(&dsi->host);
> + pm_runtime_disable(&pdev->dev);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id rzg2l_mipi_dsi_of_table[] = {
> + { .compatible = "renesas,rzg2l-mipi-dsi" },
> + { /* sentinel */ }
> +};
> +
> +MODULE_DEVICE_TABLE(of, rzg2l_mipi_dsi_of_table);
> +
> +static struct platform_driver rzg2l_mipi_dsi_platform_driver = {
> + .probe = rzg2l_mipi_dsi_probe,
> + .remove = rzg2l_mipi_dsi_remove,
> + .driver = {
> + .name = "rzg2l-mipi-dsi",
> + .pm = &rzg2l_mipi_pm_ops,
> + .of_match_table = rzg2l_mipi_dsi_of_table,
> + },
> +};
> +
> +module_platform_driver(rzg2l_mipi_dsi_platform_driver);
> +
> +MODULE_AUTHOR("Biju Das <biju.das.jz@xxxxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("Renesas RZ/G2L MIPI DSI Encoder Driver");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi_regs.h b/drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi_regs.h
> new file mode 100644
> index 000000000000..1dbc16ec64a4
> --- /dev/null
> +++ b/drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi_regs.h
> @@ -0,0 +1,151 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * RZ/G2L MIPI DSI Interface Registers Definitions
> + *
> + * Copyright (C) 2022 Renesas Electronics Corporation
> + */
> +
> +#ifndef __RZG2L_MIPI_DSI_REGS_H__
> +#define __RZG2L_MIPI_DSI_REGS_H__
> +
> +#include <linux/bits.h>
> +
> +/* DPHY Registers */
> +#define DSIDPHYCTRL0 0x00
> +#define DSIDPHYCTRL0_CAL_EN_HSRX_OFS BIT(16)
> +#define DSIDPHYCTRL0_CMN_MASTER_EN BIT(8)
> +#define DSIDPHYCTRL0_RE_VDD_DETVCCQLV18 BIT(2)
> +#define DSIDPHYCTRL0_EN_LDO1200 BIT(1)
> +#define DSIDPHYCTRL0_EN_BGR BIT(0)
> +
> +#define DSIDPHYTIM0 0x04
> +#define DSIDPHYTIM0_TCLK_MISS(x) ((x) << 24)
> +#define DSIDPHYTIM0_T_INIT(x) ((x) << 0)
> +
> +#define DSIDPHYTIM1 0x08
> +#define DSIDPHYTIM1_THS_PREPARE(x) ((x) << 24)
> +#define DSIDPHYTIM1_TCLK_PREPARE(x) ((x) << 16)
> +#define DSIDPHYTIM1_THS_SETTLE(x) ((x) << 8)
> +#define DSIDPHYTIM1_TCLK_SETTLE(x) ((x) << 0)
> +
> +#define DSIDPHYTIM2 0x0c
> +#define DSIDPHYTIM2_TCLK_TRAIL(x) ((x) << 24)
> +#define DSIDPHYTIM2_TCLK_POST(x) ((x) << 16)
> +#define DSIDPHYTIM2_TCLK_PRE(x) ((x) << 8)
> +#define DSIDPHYTIM2_TCLK_ZERO(x) ((x) << 0)
> +
> +#define DSIDPHYTIM3 0x10
> +#define DSIDPHYTIM3_TLPX(x) ((x) << 24)
> +#define DSIDPHYTIM3_THS_EXIT(x) ((x) << 16)
> +#define DSIDPHYTIM3_THS_TRAIL(x) ((x) << 8)
> +#define DSIDPHYTIM3_THS_ZERO(x) ((x) << 0)
> +
> +/* --------------------------------------------------------*/
> +/* Link Registers */
> +#define LINK_REG_OFFSET 0x10000
> +
> +/* Link Status Register */
> +#define LINKSR 0x10
> +#define LINKSR_LPBUSY BIT(13)
> +#define LINKSR_HSBUSY BIT(12)
> +#define LINKSR_VICHRUN1 BIT(8)
> +#define LINKSR_SQCHRUN1 BIT(4)
> +#define LINKSR_SQCHRUN0 BIT(0)
> +
> +/* Tx Set Register */
> +#define TXSETR 0x100
> +#define TXSETR_NUMLANECAP (0x3 << 16)
> +#define TXSETR_DLEN (1 << 9)
> +#define TXSETR_CLEN (1 << 8)
> +#define TXSETR_NUMLANEUSE(x) (((x) & 0x3) << 0)
> +
> +/* HS Clock Set Register */
> +#define HSCLKSETR 0x104
> +#define HSCLKSETR_HSCLKMODE_CONT (1 << 1)
> +#define HSCLKSETR_HSCLKMODE_NON_CONT (0 << 1)
> +#define HSCLKSETR_HSCLKRUN_HS (1 << 0)
> +#define HSCLKSETR_HSCLKRUN_LP (0 << 0)
> +
> +/* Reset Control Register */
> +#define RSTCR 0x110
> +#define RSTCR_SWRST BIT(0)
> +#define RSTCR_FCETXSTP BIT(16)
> +
> +/* Reset Status Register */
> +#define RSTSR 0x114
> +#define RSTSR_DL0DIR (1 << 15)
> +#define RSTSR_DLSTPST (0xf << 8)
> +#define RSTSR_SWRSTV1 (1 << 4)
> +#define RSTSR_SWRSTIB (1 << 3)
> +#define RSTSR_SWRSTAPB (1 << 2)
> +#define RSTSR_SWRSTLP (1 << 1)
> +#define RSTSR_SWRSTHS (1 << 0)
> +
> +/* Clock Lane Stop Time Set Register */
> +#define CLSTPTSETR 0x314
> +#define CLSTPTSETR_CLKKPT(x) ((x) << 24)
> +#define CLSTPTSETR_CLKBFHT(x) ((x) << 16)
> +#define CLSTPTSETR_CLKSTPT(x) ((x) << 2)
> +
> +/* LP Transition Time Set Register */
> +#define LPTRNSTSETR 0x318
> +#define LPTRNSTSETR_GOLPBKT(x) ((x) << 0)
> +
> +/* Physical Lane Status Register */
> +#define PLSR 0x320
> +#define PLSR_CLHS2LP BIT(27)
> +#define PLSR_CLLP2HS BIT(26)
> +
> +/* Video-Input Channel 1 Set 0 Register */
> +#define VICH1SET0R 0x400
> +#define VICH1SET0R_VSEN BIT(12)
> +#define VICH1SET0R_HFPNOLP BIT(10)
> +#define VICH1SET0R_HBPNOLP BIT(9)
> +#define VICH1SET0R_HSANOLP BIT(8)
> +#define VICH1SET0R_VSTPAFT BIT(1)
> +#define VICH1SET0R_VSTART BIT(0)
> +
> +/* Video-Input Channel 1 Set 1 Register */
> +#define VICH1SET1R 0x404
> +#define VICH1SET1R_DLY(x) (((x) & 0xfff) << 2)
> +
> +/* Video-Input Channel 1 Status Register */
> +#define VICH1SR 0x410
> +#define VICH1SR_VIRDY BIT(3)
> +#define VICH1SR_RUNNING BIT(2)
> +#define VICH1SR_STOP BIT(1)
> +#define VICH1SR_START BIT(0)
> +
> +/* Video-Input Channel 1 Pixel Packet Set Register */
> +#define VICH1PPSETR 0x420
> +#define VICH1PPSETR_DT_RGB18 (0x1e << 16)
> +#define VICH1PPSETR_DT_RGB18_LS (0x2e << 16)
> +#define VICH1PPSETR_DT_RGB24 (0x3e << 16)
> +#define VICH1PPSETR_TXESYNC_PULSE (1 << 15)
> +#define VICH1PPSETR_VC(x) ((x) << 22)
> +
> +/* Video-Input Channel 1 Vertical Size Set Register */
> +#define VICH1VSSETR 0x428
> +#define VICH1VSSETR_VACTIVE(x) (((x) & 0x7fff) << 16)
> +#define VICH1VSSETR_VSPOL_LOW (1 << 15)
> +#define VICH1VSSETR_VSPOL_HIGH (0 << 15)
> +#define VICH1VSSETR_VSA(x) (((x) & 0xfff) << 0)
> +
> +/* Video-Input Channel 1 Vertical Porch Set Register */
> +#define VICH1VPSETR 0x42c
> +#define VICH1VPSETR_VFP(x) (((x) & 0x1fff) << 16)
> +#define VICH1VPSETR_VBP(x) (((x) & 0x1fff) << 0)
> +
> +/* Video-Input Channel 1 Horizontal Size Set Register */
> +#define VICH1HSSETR 0x430
> +#define VICH1HSSETR_HACTIVE(x) (((x) & 0x7fff) << 16)
> +#define VICH1HSSETR_HSPOL_LOW (1 << 15)
> +#define VICH1HSSETR_HSPOL_HIGH (0 << 15)
> +#define VICH1HSSETR_HSA(x) (((x) & 0xfff) << 0)
> +
> +/* Video-Input Channel 1 Horizontal Porch Set Register */
> +#define VICH1HPSETR 0x434
> +#define VICH1HPSETR_HFP(x) (((x) & 0x1fff) << 16)
> +#define VICH1HPSETR_HBP(x) (((x) & 0x1fff) << 0)
> +
> +#endif /* __RZG2L_MIPI_DSI_REGS_H__ */
--
Regards,
Laurent Pinchart
