Re: [PATCH 02/11] drm: rcar-du: remove R-Car H3 ES1.* workarounds

From: Kieran Bingham
Date: Wed Mar 08 2023 - 05:12:03 EST

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Hi Wolfram,

Quoting Wolfram Sang (2023-03-07 16:30:30)
> R-Car H3 ES1.* was only available to an internal development group and
> needed a lot of quirks and workarounds. These become a maintenance
> burden now, so our development group decided to remove upstream support
> and disable booting for this SoC. Public users only have ES2 onwards.
>
> Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>

Wow, this lets us get rid of workarounds all throughout.

This looks pretty decisive, and complete to me.

Reviewed-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx>

> ---
> Please apply individually per subsystem. There are no dependencies and the SoC
> doesn't boot anymore since v6.3-rc1.
>
> drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 37 ++------------------
> drivers/gpu/drm/rcar-du/rcar_du_drv.c | 48 --------------------------
> drivers/gpu/drm/rcar-du/rcar_du_drv.h | 2 --
> drivers/gpu/drm/rcar-du/rcar_du_regs.h | 3 +-
> 4 files changed, 4 insertions(+), 86 deletions(-)
>
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> index 008e172ed43b..84411c452e30 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> @@ -223,20 +223,6 @@ static void rcar_du_crtc_set_display_timing(struct rcar_du_crtc *rcrtc)
> * DU channels that have a display PLL can't use the internal
> * system clock, and have no internal clock divider.
> */
> -
> - /*
> - * The H3 ES1.x exhibits dot clock duty cycle stability issues.
> - * We can work around them by configuring the DPLL to twice the
> - * desired frequency, coupled with a /2 post-divider. Restrict
> - * the workaround to H3 ES1.x as ES2.0 and all other SoCs have
> - * no post-divider when a display PLL is present (as shown by
> - * the workaround breaking HDMI output on M3-W during testing).
> - */
> - if (rcdu->info->quirks & RCAR_DU_QUIRK_H3_ES1_PCLK_STABILITY) {
> - target *= 2;
> - div = 1;
> - }
> -
> extclk = clk_get_rate(rcrtc->extclock);
> rcar_du_dpll_divider(rcrtc, &dpll, extclk, target);
>
> @@ -245,30 +231,13 @@ static void rcar_du_crtc_set_display_timing(struct rcar_du_crtc *rcrtc)
> | DPLLCR_N(dpll.n) | DPLLCR_M(dpll.m)
> | DPLLCR_STBY;
>
> - if (rcrtc->index == 1) {
> + if (rcrtc->index == 1)
> dpllcr |= DPLLCR_PLCS1
> | DPLLCR_INCS_DOTCLKIN1;
> - } else {
> - dpllcr |= DPLLCR_PLCS0_PLL
> + else
> + dpllcr |= DPLLCR_PLCS0
> | DPLLCR_INCS_DOTCLKIN0;
>
> - /*
> - * On ES2.x we have a single mux controlled via bit 21,
> - * which selects between DCLKIN source (bit 21 = 0) and
> - * a PLL source (bit 21 = 1), where the PLL is always
> - * PLL1.
> - *
> - * On ES1.x we have an additional mux, controlled
> - * via bit 20, for choosing between PLL0 (bit 20 = 0)
> - * and PLL1 (bit 20 = 1). We always want to use PLL1,
> - * so on ES1.x, in addition to setting bit 21, we need
> - * to set the bit 20.
> - */
> -
> - if (rcdu->info->quirks & RCAR_DU_QUIRK_H3_ES1_PLL)
> - dpllcr |= DPLLCR_PLCS0_H3ES1X_PLL1;
> - }
> -
> rcar_du_group_write(rcrtc->group, DPLLCR, dpllcr);
>
> escr = ESCR_DCLKSEL_DCLKIN | div;
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> index b9a94c5260e9..1ffde19cb87f 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> @@ -16,7 +16,6 @@
> #include <linux/platform_device.h>
> #include <linux/pm.h>
> #include <linux/slab.h>
> -#include <linux/sys_soc.h>
> #include <linux/wait.h>
>
> #include <drm/drm_atomic_helper.h>
> @@ -387,43 +386,6 @@ static const struct rcar_du_device_info rcar_du_r8a7795_info = {
> .dpll_mask = BIT(2) | BIT(1),
> };
>
> -static const struct rcar_du_device_info rcar_du_r8a7795_es1_info = {
> - .gen = 3,
> - .features = RCAR_DU_FEATURE_CRTC_IRQ
> - | RCAR_DU_FEATURE_CRTC_CLOCK
> - | RCAR_DU_FEATURE_VSP1_SOURCE
> - | RCAR_DU_FEATURE_INTERLACED
> - | RCAR_DU_FEATURE_TVM_SYNC,
> - .quirks = RCAR_DU_QUIRK_H3_ES1_PCLK_STABILITY
> - | RCAR_DU_QUIRK_H3_ES1_PLL,
> - .channels_mask = BIT(3) | BIT(2) | BIT(1) | BIT(0),
> - .routes = {
> - /*
> - * R8A7795 has one RGB output, two HDMI outputs and one
> - * LVDS output.
> - */
> - [RCAR_DU_OUTPUT_DPAD0] = {
> - .possible_crtcs = BIT(3),
> - .port = 0,
> - },
> - [RCAR_DU_OUTPUT_HDMI0] = {
> - .possible_crtcs = BIT(1),
> - .port = 1,
> - },
> - [RCAR_DU_OUTPUT_HDMI1] = {
> - .possible_crtcs = BIT(2),
> - .port = 2,
> - },
> - [RCAR_DU_OUTPUT_LVDS0] = {
> - .possible_crtcs = BIT(0),
> - .port = 3,
> - },
> - },
> - .num_lvds = 1,
> - .num_rpf = 5,
> - .dpll_mask = BIT(2) | BIT(1),
> -};
> -
> static const struct rcar_du_device_info rcar_du_r8a7796_info = {
> .gen = 3,
> .features = RCAR_DU_FEATURE_CRTC_IRQ
> @@ -614,11 +576,6 @@ static const struct of_device_id rcar_du_of_table[] = {
>
> MODULE_DEVICE_TABLE(of, rcar_du_of_table);
>
> -static const struct soc_device_attribute rcar_du_soc_table[] = {
> - { .soc_id = "r8a7795", .revision = "ES1.*", .data = &rcar_du_r8a7795_es1_info },
> - { /* sentinel */ }
> -};
> -
> const char *rcar_du_output_name(enum rcar_du_output output)
> {
> static const char * const names[] = {
> @@ -707,7 +664,6 @@ static void rcar_du_shutdown(struct platform_device *pdev)
>
> static int rcar_du_probe(struct platform_device *pdev)
> {
> - const struct soc_device_attribute *soc_attr;
> struct rcar_du_device *rcdu;
> unsigned int mask;
> int ret;
> @@ -725,10 +681,6 @@ static int rcar_du_probe(struct platform_device *pdev)
>
> rcdu->info = of_device_get_match_data(rcdu->dev);
>
> - soc_attr = soc_device_match(rcar_du_soc_table);
> - if (soc_attr)
> - rcdu->info = soc_attr->data;
> -
> platform_set_drvdata(pdev, rcdu);
>
> /* I/O resources */
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.h b/drivers/gpu/drm/rcar-du/rcar_du_drv.h
> index acc3673fefe1..5cfa2bb7ad93 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_drv.h
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.h
> @@ -34,8 +34,6 @@ struct rcar_du_device;
> #define RCAR_DU_FEATURE_NO_BLENDING BIT(5) /* PnMR.SPIM does not have ALP nor EOR bits */
>
> #define RCAR_DU_QUIRK_ALIGN_128B BIT(0) /* Align pitches to 128 bytes */
> -#define RCAR_DU_QUIRK_H3_ES1_PCLK_STABILITY BIT(1) /* H3 ES1 has pclk stability issue */
> -#define RCAR_DU_QUIRK_H3_ES1_PLL BIT(2) /* H3 ES1 PLL setup differs from non-ES1 */
>
> enum rcar_du_output {
> RCAR_DU_OUTPUT_DPAD0,
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_regs.h b/drivers/gpu/drm/rcar-du/rcar_du_regs.h
> index 789ae9285108..288eff12b2b1 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_regs.h
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_regs.h
> @@ -283,8 +283,7 @@
> #define DPLLCR 0x20044
> #define DPLLCR_CODE (0x95 << 24)
> #define DPLLCR_PLCS1 (1 << 23)
> -#define DPLLCR_PLCS0_PLL (1 << 21)
> -#define DPLLCR_PLCS0_H3ES1X_PLL1 (1 << 20)
> +#define DPLLCR_PLCS0 (1 << 21)
> #define DPLLCR_CLKE (1 << 18)
> #define DPLLCR_FDPLL(n) ((n) << 12)
> #define DPLLCR_N(n) ((n) << 5)
> --
> 2.35.1
>

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