Hi Laurent,
Thanks for the feedback.
> Subject: Re: [PATCH v5 2/2] drm: rcar-du: Add RZ/G2L DSI driver
>
> Hi Biju,
>
> Thank you for the patch.
>
> On Thu, Aug 25, 2022 at 02:42:29PM +0100, Biju Das wrote:
> > This driver supports the MIPI DSI encoder found in the RZ/G2L SoC. It
> > currently supports DSI mode only.
>
> What other modes than DSI are there ?
Currently it supports video mode only (video-input operation).
This mode is tested with DSI connected to ADV7535 bridge.
But lot of customers are asking for DSI panel support as well.
So going forward this driver needs to support DSI DCS commands
for supporting DSI panels.
>
> > Signed-off-by: Biju Das <biju.das...@bp.renesas.com>
> > Acked-by: Sam Ravnborg <s...@ravnborg.org>
> > ---
> > 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:
> > *
> > ---
> > drivers/gpu/drm/rcar-du/Kconfig | 8 +
> > drivers/gpu/drm/rcar-du/Makefile | 2 +
> > drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi.c | 690
> ++++++++++++++++++
> > drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi_regs.h | 151 ++++
> > 4 files changed, 851 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 e7275b5e7ec8..14a3fa88cc0b 100644
> > --- a/drivers/gpu/drm/rcar-du/Makefile
> > +++ b/drivers/gpu/drm/rcar-du/Makefile
> > @@ -15,6 +15,8 @@ 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
> > DTC_FLAGS_rcar_du_of_lvds_r8a7791 += -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..e0bdb5dc7036
> > --- /dev/null
> > +++ b/drivers/gpu/drm/rcar-du/rzg2l_mipi_dsi.c
> > @@ -0,0 +1,690 @@
> > +// 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 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;
> > + 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;
> > + 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);
> > +
> > + /* 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;
> > + }
> > +
> > + ret = reset_control_deassert(dsi->arstc);
> > + if (ret < 0)
> > + return ret;
> > +
> > + ret = reset_control_deassert(dsi->prstc);
> > + if (ret < 0)
> > + goto err_prstc;
>
> The code could be simplified by moving handling of arst and prst to
> runtime PM suspend/resume handlers. What do you think ?
I agree it simplifies the code. Will add it in next version.
>
> > +
> > + ret = pm_runtime_resume_and_get(dsi->dev);
> > + if (ret < 0)
> > + goto err_pm;
> > +
> > + 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_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);
> > +
> > + /* Check number of lanes capability */
> > + max_num_lanes = rzg2l_mipi_dsi_link_read(dsi, TXSETR) >> 16;
> > + max_num_lanes = (max_num_lanes & 0x3) + 1;
> > + if (max_num_lanes < dsi->lanes) {
>
> Could this be read at probe time, and enforced in
> rzg2l_mipi_dsi_host_attach() ?
Agreed.
>
> > + dev_err(dsi->dev, "DPHY can not support %d lanes", dsi-
> >lanes);
> > + ret = -EINVAL;
> > + goto err_phy;
> > + }
> > +
> > + /* 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_phy:
> > + reset_control_assert(dsi->rstc);
> > +err_rstc:
> > + pm_runtime_put(dsi->dev);
> > +err_pm:
> > + reset_control_assert(dsi->prstc);
> > +err_prstc:
> > + reset_control_assert(dsi->arstc);
> > +
> > + 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)
> > + vich1ppsetr |= VICH1PPSETR_TXESYNC_PULSE;
> > +
> > + if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST)
> > + vich1ppsetr &= ~VICH1PPSETR_TXESYNC_PULSE;
>
> if ((dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) &&
> !(dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST))
> vich1ppsetr |= VICH1PPSETR_TXESYNC_PULSE;
>
> would be easier to understand.
OK, will fix.
>
> > + 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 hsclk_running_mode;
> > + u32 hsclksetr;
> > + u32 status;
> > + int ret;
> > +
> > + hsclk_running_mode = !(dsi->mode_flags &
> > +MIPI_DSI_CLOCK_NON_CONTINUOUS);
>
> Rename hsclk_running_mode to clk_cont or something similar. A bool named
> hsclk_running_mode doesn't clearly tell what true or false mean.
OK, will use is_clk_cont for bool.
>
> > +
> > + /* Start HS clock */
> > + hsclksetr = HSCLKSETR_HSCLKRUN_HS | (hsclk_running_mode ?
> > + HSCLKSETR_HSCLKMODE_CONT :
> > + HSCLKSETR_HSCLKMODE_NON_CONT);
> > + rzg2l_mipi_dsi_link_write(dsi, HSCLKSETR, hsclksetr);
> > +
> > + if (hsclk_running_mode) {
> > + 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",
> > + hsclk_running_mode ? "continuous" : "non-continuous");
> > +
> > + return 0;
> > +}
> > +
> > +static int rzg2l_mipi_dsi_stop_hs_clock(struct rzg2l_mipi_dsi *dsi) {
> > + bool hsclk_mode;
> > + u32 status;
> > + int ret;
> > +
> > + hsclk_mode = !(dsi->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS);
>
> Same here.
OK.
>
> > +
> > + /* Stop HS clock */
> > + rzg2l_mipi_dsi_link_write(dsi, HSCLKSETR,
> > + hsclk_mode ? HSCLKSETR_HSCLKMODE_CONT :
> > + HSCLKSETR_HSCLKMODE_NON_CONT);
> > +
> > + if (hsclk_mode) {
> > + 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:
> > + pm_runtime_put(dsi->dev);
> > + reset_control_assert(dsi->rstc);
> > + reset_control_assert(dsi->arstc);
> > + reset_control_assert(dsi->prstc);
> > +}
> > +
> > +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;
> > +
> > + 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, };
> > +
> > +/*
> > +---------------------------------------------------------------------
> > +--------
> > + * 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;
> > +
> > + 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");
>
> The DT binding lists 6 clocks, what happens to the other ones ?
PM manages all the clocks. Our clk driver supports multiple clock handling
in PM domain[1].
So a single PM resume call will enable all the clocks.
[1]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/clk/renesas?h=v6.0-rc2&id=2fa9fd69b3ee015a873e44f7c645ad7bcb79d290
>
> > + 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 arst\n");
>
> s/arst/rst/
OK.
>
> > +
> > + 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");
> > +
> > + 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;
> > +
> > + /* Initialize the DRM bridge. */
> > + dsi->bridge.funcs = &rzg2l_mipi_dsi_bridge_ops;
> > + dsi->bridge.of_node = dsi->dev->of_node;
>
> This should go before the registration of the DSI host, in case the
> bridge gets used right after the DSI host gets registered.
OK.
>
> > +
> > + 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 = {
> > + .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...@bp.renesas.com");
>
> Missing > after the e-mail address.
OK. Will fix this in next version
Cheers,
Biju
>
> > +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
