RE: [PATCH v6 2/2] drm: rcar-du: Add RZ/G2L DSI driver

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Hi Laurent,

Thanks for the feedback.

> Subject: Re: [PATCH v6 2/2] drm: rcar-du: Add RZ/G2L DSI driver
> 
> 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:
> >  *
> > ---
> >  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().

OK, will wrap these calls into a function 
rzg2l_mipi_dsi_assert_rst_and_stop_clocks() and                    
is called from rzg2l_mipi_dsi_atomic_{enable,disable} to                      
assert cmn_rst followed by stopping dsi clocks.

> 
> > +}
> > +
> > +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 ...
OK.
> 
> > +
> > +	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.

Oops. Agreed will fix this in next version.
> 
> > +
> > +	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.

OK, will fix this in next version.

Cheers,
Biju

> 
> 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




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