Hi Laurent,
Thanks for the feedback.
> Subject: Re: [RFC 22/28] drm: rcar-du: Add RZ/G2L DSI driver
>
> Hi Biju,
>
> Thank you for the patch.
>
> On Wed, Jan 12, 2022 at 05:46:06PM +0000, Biju Das wrote:
> > This driver supports the MIPI DSI encoder found in the RZ/G2L SoC. It
> > currently supports DSI mode only.
> >
> > Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
> > ---
> > drivers/gpu/drm/rcar-du/Kconfig | 7 +
> > drivers/gpu/drm/rcar-du/Makefile | 1 +
> > drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi.c | 676 ++++++++++++++++++
> > drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi_regs.h | 151 ++++
> > 4 files changed, 835 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 f6e6a6d5d987..ca87fb186f02
> > 100644
> > --- a/drivers/gpu/drm/rcar-du/Kconfig
> > +++ b/drivers/gpu/drm/rcar-du/Kconfig
> > @@ -51,6 +51,13 @@ 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 && DRM_BRIDGE && OF
> > + 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 286bc81b3e7c..3b5fd7610282 100644
> > --- a/drivers/gpu/drm/rcar-du/Makefile
> > +++ b/drivers/gpu/drm/rcar-du/Makefile
> > @@ -20,6 +20,7 @@ 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
> >
> > # 'remote-endpoint' is fixed up at run-time
> > DTC_FLAGS_rcar_du_of_lvds_r8a7790 += -Wno-graph_endpoint 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..8a11fedd7cd7
> > --- /dev/null
> > +++ b/drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi.c
> > @@ -0,0 +1,676 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * RZ/G2L MIPI DSI Encoder Driver
> > + *
> > + * Copyright (C) 2021 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 *link_mmio;
> > + void __iomem *phy_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 lanes;
> > + unsigned long mode_flags;
> > +
> > + bool hsclkmode; /* 0 for non-continuous and 1 for continuous clock
> mode */
>
> Booleans should be true or false, not 0 or 1. A bool value named hsclkmode
> isn't very readable, without this comment, it's not easy to tell which
> value corresponds to which mode. I would drop this field, and replace its
> usage with mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS.
Agreed.
>
> > +};
> > +
> > +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_write(void __iomem *mem, u32 reg, u32
> > +data) {
> > + iowrite32(data, mem + reg);
> > +}
> > +
> > +static u32 rzg2l_mipi_dsi_read(void __iomem *mem, u32 reg) {
> > + return ioread32(mem + reg);
> > +}
> > +
> > +static void rzg2l_mipi_dsi_clr(void __iomem *mem, u32 reg, u32 clr) {
> > + rzg2l_mipi_dsi_write(mem, reg, rzg2l_mipi_dsi_read(mem, reg) &
> > +~clr); }
> > +
> > +/*
> > +---------------------------------------------------------------------
> > +--------
> > + * 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;
> > + u8 max_num_lanes;
> > + 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;
> > +
> > + /* 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);
> > +
> > + /* Initializing DPHY before accessing LINK */
> > +
> > + /* 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;
> > + }
> > +
> > + reset_control_deassert(dsi->arstc);
> > + reset_control_deassert(dsi->prstc);
> > +
> > + pm_runtime_get_sync(dsi->dev);
>
> Error check, and use pm_runtime_resume_and_get() instead.
> pm_runtime_get_sync() requires a call to pm_runtime_put_noidle() even on
> failure, which makes error handling more complex.
Agreed.
>
> > +
> > + clk_set_rate(dsi->vclk, mode->clock * 1000);
> > +
> > + dphyctrl0 = DSIDPHYCTRL0_CAL_EN_HSRX_OFS |
> DSIDPHYCTRL0_CMN_MASTER_EN |
> > + DSIDPHYCTRL0_RE_VDD_DETVCCQLV18 | DSIDPHYCTRL0_EN_BGR;
> > +
> > + rzg2l_mipi_dsi_write(dsi->phy_mmio, DSIDPHYCTRL0, dphyctrl0);
> > + usleep_range(20, 30);
> > +
> > + dphyctrl0 |= DSIDPHYCTRL0_EN_LDO1200;
> > + rzg2l_mipi_dsi_write(dsi->phy_mmio, 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_write(dsi->phy_mmio, DSIDPHYTIM0, dphytim0);
> > + rzg2l_mipi_dsi_write(dsi->phy_mmio, DSIDPHYTIM1, dphytim1);
> > + rzg2l_mipi_dsi_write(dsi->phy_mmio, DSIDPHYTIM2, dphytim2);
> > + rzg2l_mipi_dsi_write(dsi->phy_mmio, DSIDPHYTIM3, dphytim3);
> > +
> > + reset_control_deassert(dsi->rstc);
> > + udelay(1);
> > +
> > + /* Check number of lanes capability */
> > + max_num_lanes = rzg2l_mipi_dsi_read(dsi->link_mmio, TXSETR) >> 16;
> > + max_num_lanes = (max_num_lanes & 0x3) + 1;
> > + if (max_num_lanes < dsi->lanes) {
> > + dev_err(dsi->dev, "DPHY can not support %d lanes", dsi-
> >lanes);
> > + return -EINVAL;
> > + }
> > +
> > + /* Enable Data lanes and Clock lanes */
> > + txsetr = TXSETR_DLEN | TXSETR_NUMLANEUSE(dsi->lanes - 1) |
> TXSETR_CLEN;
> > + rzg2l_mipi_dsi_write(dsi->link_mmio, 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_write(dsi->link_mmio, CLSTPTSETR, clstptsetr);
> > +
> > + lptrnstsetr = LPTRNSTSETR_GOLPBKT(golpbkt);
> > + rzg2l_mipi_dsi_write(dsi->link_mmio, LPTRNSTSETR, lptrnstsetr);
> > +
> > + return 0;
> > +}
> > +
> > +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];
> > +
> > + /* 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;
> > + case 16:
> > + vich1ppsetr = VICH1PPSETR_DT_RGB16;
> > + break;
> > + default:
> > + dev_warn(dsi->dev, "unsupported format");
> > + return;
>
> Could you check for unsupported formats in rzg2l_mipi_dsi_host_attach()
> instead, so that the error can be propagated ?
Agreed.
>
> > + }
> > +
> > + if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
> > + vich1ppsetr |= VICH1PPSETR_TXESYNC_PULSE;
> > +
> > + if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST)
> > + vich1ppsetr &= ~VICH1PPSETR_TXESYNC_PULSE;
> > +
> > + rzg2l_mipi_dsi_write(dsi->link_mmio, 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_write(dsi->link_mmio, VICH1VSSETR, vich1vssetr);
> > + rzg2l_mipi_dsi_write(dsi->link_mmio, VICH1VPSETR, vich1vpsetr);
> > + rzg2l_mipi_dsi_write(dsi->link_mmio, VICH1HSSETR, vich1hssetr);
> > + rzg2l_mipi_dsi_write(dsi->link_mmio, VICH1HPSETR, vich1hpsetr);
> > +
> > + if (dsi->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS)
> > + dsi->hsclkmode = 0;
> > + else
> > + dsi->hsclkmode = 1;
> > +
> > + /*
> > + * 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;
> > + }
> > +
> > + rzg2l_mipi_dsi_write(dsi->link_mmio, VICH1SET1R,
> > + VICH1SET1R_DLY(delay[dsi->hsclkmode]));
> > +}
> > +
> > +static int rzg2l_mipi_dsi_start_hs_clock(struct rzg2l_mipi_dsi *dsi)
> > +{
> > + u32 hsclksetr;
> > + u32 status;
> > + int ret;
> > +
> > + /* Start HS clock */
> > + hsclksetr = HSCLKSETR_HSCLKRUN_HS |
> > + (dsi->hsclkmode ? HSCLKSETR_HSCLKMODE_CONT :
> > + HSCLKSETR_HSCLKMODE_NON_CONT);
> > + rzg2l_mipi_dsi_write(dsi->link_mmio, HSCLKSETR, hsclksetr);
> > +
> > + if (dsi->hsclkmode) {
> > + ret = read_poll_timeout(rzg2l_mipi_dsi_read, status,
> > + status & PLSR_CLLP2HS,
> > + 2000, 20000, false, dsi->link_mmio, 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",
> > + dsi->hsclkmode ? "continuous" : "non-continuous");
> > +
> > + return 0;
> > +}
> > +
> > +static int rzg2l_mipi_dsi_stop_hs_clock(struct rzg2l_mipi_dsi *dsi) {
> > + u32 status;
> > + int ret;
> > +
> > + /* Stop HS clock */
> > + rzg2l_mipi_dsi_clr(dsi->link_mmio, HSCLKSETR,
> > +HSCLKSETR_HSCLKRUN_HS);
>
> As HSCLKSETR has been written in rzg2l_mipi_dsi_start_hs_clock(), I think
> you can write the register directly here too, without a read-modify-write
> sequence:
>
> rzg2l_mipi_dsi_write(dsi->link_mmio, HSCLKSETR,
> dsi->hsclkmode ? HSCLKSETR_HSCLKMODE_CONT :
> HSCLKSETR_HSCLKMODE_NON_CONT);
>
> (you can store the result of dsi->hsclkmode ? HSCLKSETR_HSCLKMODE_CONT in
> a local variable, as it's used on the next line too, or just copy the
> check, up to you).
OK.
>
> > +
> > + if (dsi->hsclkmode) {
> > + ret = read_poll_timeout(rzg2l_mipi_dsi_read, status,
> > + status & PLSR_CLHS2LP,
> > + 2000, 20000, false, dsi->link_mmio, 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_write(dsi->link_mmio, VICH1SET0R, vich1set0r);
> > +
> > + ret = read_poll_timeout(rzg2l_mipi_dsi_read, status,
> > + status & VICH1SR_VIRDY,
> > + 2000, 20000, false, dsi->link_mmio, VICH1SR);
> > + if (ret < 0) {
> > + dev_err(dsi->dev, "Failed to start video signal input\n");
> > + return ret;
> > + }
> > +
> > + dev_dbg(dsi->dev, "Start video transferring");
> > +
> > + return 0;
> > +}
> > +
> > +static int rzg2l_mipi_dsi_stop_video(struct rzg2l_mipi_dsi *dsi) {
> > + u32 status;
> > + int ret;
> > +
> > + rzg2l_mipi_dsi_write(dsi->link_mmio, VICH1SET0R,
> VICH1SET0R_VSTPAFT);
> > + ret = read_poll_timeout(rzg2l_mipi_dsi_read, status,
> > + (status & VICH1SR_STOP) && (!(status &
> VICH1SR_RUNNING)),
> > + 2000, 20000, false, dsi->link_mmio, VICH1SR);
> > + if (ret < 0)
> > + goto err;
> > +
> > + ret = read_poll_timeout(rzg2l_mipi_dsi_read, status,
> > + !(status & LINKSR_HSBUSY),
> > + 2000, 20000, false, dsi->link_mmio, 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)
> > + return;
> > +
> > + ret = rzg2l_mipi_dsi_start_video(dsi);
> > + if (ret < 0)
> > + return;
> > +}
> > +
> > +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);
> > + pm_runtime_put(dsi->dev);
> > + reset_control_assert(dsi->rstc);
> > + reset_control_assert(dsi->arstc);
> > + reset_control_assert(dsi->prstc);
> > +}
> > +
> > +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 (device->lanes > dsi->num_data_lanes)
> > + 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;
> > + }
> > +
> > + /* Initialize the DRM bridge. */
> > + dsi->bridge.funcs = &rzg2l_mipi_dsi_bridge_ops;
> > + dsi->bridge.of_node = dsi->dev->of_node;
> > + 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, };
> > +
> > +/*
> > +---------------------------------------------------------------------
> > +--------
> > + * Probe & Remove
> > + */
> > +
> > +static int rzg2l_mipi_dsi_parse_dt(struct rzg2l_mipi_dsi *dsi) {
> > + struct device_node *ep;
> > + u32 data_lanes[4];
> > + int ret;
> > +
> > + ep = of_graph_get_endpoint_by_regs(dsi->dev->of_node, 1, 0);
> > + if (!ep) {
> > + dev_dbg(dsi->dev, "unconnected port@1\n");
> > + return -ENODEV;
> > + }
> > +
> > + ret = of_property_read_variable_u32_array(ep, "data-lanes",
> data_lanes,
> > + 1, 4);
> > + of_node_put(ep);
> > +
> > + if (ret < 0) {
> > + dev_err(dsi->dev, "missing or invalid data-lanes property\n");
> > + return -ENODEV;
> > + }
> > +
> > + dsi->num_data_lanes = ret;
> > + return 0;
> > +}
> > +
> > +static int rzg2l_mipi_dsi_probe(struct platform_device *pdev) {
> > + struct rzg2l_mipi_dsi *dsi;
> > + struct resource *mem;
> > + 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 = rzg2l_mipi_dsi_parse_dt(dsi);
> > + if (ret < 0)
> > + return ret;
> > +
> > + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > + dsi->link_mmio = devm_ioremap_resource(dsi->dev, mem);
>
> You can use devm_platform_ioremap_resource(), here and below.
OK.
>
> > + if (IS_ERR(dsi->link_mmio))
> > + return PTR_ERR(dsi->link_mmio);
> > +
> > + mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> > + dsi->phy_mmio = devm_ioremap_resource(dsi->dev, mem);
> > + if (IS_ERR(dsi->phy_mmio))
> > + return PTR_ERR(dsi->phy_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(dsi->dev, "rst");
> > + if (IS_ERR(dsi->rstc))
> > + return dev_err_probe(dsi->dev, PTR_ERR(dsi->rstc), "failed to
> get
> > +cpg reset\n");
>
> I'd wrap the line after the PTR_ERR().
OK.
>
> > +
> > + dsi->arstc = devm_reset_control_get(dsi->dev, "arst");
> > + if (IS_ERR(dsi->arstc))
> > + return dev_err_probe(&pdev->dev, PTR_ERR(dsi->arstc), "failed
> to
> > +get cpg reset\n");
>
> Should the error message be different than the previous one ? Otherwise
> it's hard to tell which reset can't be acquired.
OK will fix it.
>
> > +
> > + dsi->prstc = devm_reset_control_get(dsi->dev, "prst");
> > + if (IS_ERR(dsi->arstc))
>
> s/arstc/prstc/
Oops. Will fix it.
>
> > + return dev_err_probe(dsi->dev, PTR_ERR(dsi->prstc), "failed to
> get
> > +cpg reset\n");
> > +
> > + pm_runtime_enable(dsi->dev);
> > +
> > + /* 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);
> > + reset_control_assert(dsi->rstc);
> > + reset_control_assert(dsi->arstc);
> > + reset_control_assert(dsi->prstc);
>
> The reset line hasn't been deasserted in probe(), does it need to be
> asserted in the error path here ?
Agreed, No need to assert.
>
> > + 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);
> > + reset_control_assert(dsi->rstc);
> > + reset_control_assert(dsi->arstc);
> > + reset_control_assert(dsi->prstc);
>
> Same here, I don't think this is needed.
Agreed.
>
> > + return 0;
> > +}
> > +
> > +static const struct of_device_id rzg2l_mipi_dsi_of_table[] = {
> > + { .compatible = "renesas,r9a07g044-mipi-dsi" },
> > + { /* sentinel */ }
> > +};
> > +
> > +static struct platform_driver rzg2l_mipi_dsi_platform_driver = {
> > + .driver = {
> > + .name = "rzg2l-mipi-dsi",
> > + .of_match_table = rzg2l_mipi_dsi_of_table,
> > + },
> > + .probe = rzg2l_mipi_dsi_probe,
> > + .remove = rzg2l_mipi_dsi_remove,
> > +};
> > +
> > +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..bf81187388bd
> > --- /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) 2021 Renesas Electronics Corporation */
> > +
> > +#ifndef __RZG2L_MIPI_DSI_REGS_H__
> > +#define __RZG2L_MIPI_DSI_REGS_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
>
> Some hex constants are upper case, some are lower case. Could you make
> that consistent ? I personally prefer lower case, and that matches the
> style of drivers in this directory.
OK, will fix this.
Cheers,
Biju
>
> > +#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 */
> > +/* 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 BIT(9)
> > +#define TXSETR_CLEN BIT(8)
> > +#define TXSETR_NUMLANEUSE(x) (((x) & 0x3) << 0)
> > +
> > +/* HS Clock Set Register */
> > +#define HSCLKSETR 0x104
> > +#define HSCLKSETR_HSCLKMODE_CONT BIT(1)
> > +#define HSCLKSETR_HSCLKMODE_NON_CONT (0 << 1)
> > +#define HSCLKSETR_HSCLKRUN_HS BIT(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 BIT(15)
> > +#define RSTSR_DLSTPST (0xf << 8)
> > +#define RSTSR_SWRSTV1 BIT(4)
> > +#define RSTSR_SWRSTIB BIT(3)
> > +#define RSTSR_SWRSTAPB BIT(2)
> > +#define RSTSR_SWRSTLP BIT(1)
> > +#define RSTSR_SWRSTHS BIT(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_RGB16 (0x0E << 16)
> > +#define VICH1PPSETR_DT_RGB18 (0x1E << 16)
> > +#define VICH1PPSETR_DT_RGB18_LS (0x2E << 16)
> > +#define VICH1PPSETR_DT_RGB24 (0x3E << 16)
> > +#define VICH1PPSETR_DT_YCbCr16 (0x2C << 16)
> > +#define VICH1PPSETR_DT_YCbCr20_LS (0x0C << 16)
> > +#define VICH1PPSETR_DT_YCbCr24 (0x1C << 16)
> > +#define VICH1PPSETR_TXESYNC_PULSE BIT(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 BIT(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 BIT(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
