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Message-ID: <eecb803b-ee4a-231d-f638-f2548df47008@collabora.com>
Date: Tue, 30 Aug 2022 09:47:27 +0200
From: AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>
To: "zheng-yan.chen" <zheng-yan.chen@...iatek.com>,
Chun-Kuang Hu <chunkuang.hu@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Matthias Brugger <matthias.bgg@...il.com>
Cc: dri-devel@...ts.freedesktop.org,
linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
"Jason-JH . Lin" <jason-jh.lin@...iatek.com>,
Singo Chang <singo.chang@...iatek.com>,
Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v2 2/3] drm/mediatek: Add gamma lut support for mt8195
Il 30/08/22 08:39, zheng-yan.chen ha scritto:
> Since the previous gamma_set_common() function is designed for
> 9bit-to-10bit conversion, which is not feasible for the
> 10bit-to-12bit conversion in mt8195.
>
> Update the function to fit the need of mt8195.
>
> Fixes: 7266e90a51a3 ("drm/mediatek: Add mediatek-drm of vdosys0 support for mt8195")
> Signed-off-by: zheng-yan.chen <zheng-yan.chen@...iatek.com>
> ---
> drivers/gpu/drm/mediatek/mtk_disp_aal.c | 2 +-
> drivers/gpu/drm/mediatek/mtk_disp_drv.h | 3 +-
> drivers/gpu/drm/mediatek/mtk_disp_gamma.c | 102 +++++++++++++++-----
> drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 5 +-
> drivers/gpu/drm/mediatek/mtk_drm_crtc.h | 1 -
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 1 +
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 1 +
> drivers/gpu/drm/mediatek/mtk_drm_drv.c | 2 +
> 8 files changed, 85 insertions(+), 32 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_aal.c b/drivers/gpu/drm/mediatek/mtk_disp_aal.c
> index 0f9d7efb61d7..f563eee3c330 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_aal.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_aal.c
> @@ -66,7 +66,7 @@ void mtk_aal_gamma_set(struct device *dev, struct drm_crtc_state *state)
> struct mtk_disp_aal *aal = dev_get_drvdata(dev);
>
> if (aal->data && aal->data->has_gamma)
> - mtk_gamma_set_common(aal->regs, state, false);
> + mtk_gamma_set_common(aal->regs, state, dev);
> }
>
> void mtk_aal_start(struct device *dev)
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> index 33e61a136bbc..c1269fce9a66 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> @@ -51,8 +51,9 @@ void mtk_gamma_clk_disable(struct device *dev);
> void mtk_gamma_config(struct device *dev, unsigned int w,
> unsigned int h, unsigned int vrefresh,
> unsigned int bpc, struct cmdq_pkt *cmdq_pkt);
> +unsigned int mtk_gamma_size(struct device *dev);
> void mtk_gamma_set(struct device *dev, struct drm_crtc_state *state);
> -void mtk_gamma_set_common(void __iomem *regs, struct drm_crtc_state *state, bool lut_diff);
> +void mtk_gamma_set_common(void __iomem *regs, struct drm_crtc_state *state, struct device *dev);
> void mtk_gamma_start(struct device *dev);
> void mtk_gamma_stop(struct device *dev);
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> index bbd558a036ec..0409e15fceb3 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> @@ -18,18 +18,22 @@
> #define DISP_GAMMA_EN 0x0000
> #define GAMMA_EN BIT(0)
> #define DISP_GAMMA_CFG 0x0020
> +#define RELAY_MODE BIT(0)
> #define GAMMA_LUT_EN BIT(1)
> #define GAMMA_DITHERING BIT(2)
> #define DISP_GAMMA_SIZE 0x0030
> +#define DISP_GAMMA_BANK 0x0100
> #define DISP_GAMMA_LUT 0x0700
> -
> -#define LUT_10BIT_MASK 0x03ff
> -
> +#define DISP_GAMMA_LUT1 0x0b00
> +#define TABLE_9BIT_SIZE 512
> +#define TABLE_10BIT_SIZE 1024
Please remove these two unused definitions.
> +#define BANK_SIZE 256
> struct mtk_disp_gamma_data {
> bool has_dither;
> bool lut_diff;
> + unsigned int lut_size;
> + unsigned int lut_bits;
We can reduce the size of this structure by using
u16 lut_size;
u8 lut_bits;
> };
> -
> /*
> * struct mtk_disp_gamma - DISP_GAMMA driver structure
> */
> @@ -54,40 +58,75 @@ void mtk_gamma_clk_disable(struct device *dev)
> clk_disable_unprepare(gamma->clk);
> }
>
> -void mtk_gamma_set_common(void __iomem *regs, struct drm_crtc_state *state, bool lut_diff)
> +void mtk_gamma_set_common(void __iomem *regs, struct drm_crtc_state *state, struct device *dev)
> {
> - unsigned int i, reg;
> - struct drm_color_lut *lut;
> + unsigned int i, reg, idx;
> void __iomem *lut_base;
> - u32 word;
> - u32 diff[3] = {0};
> + void __iomem *lut1_base;
> + u32 word, word1;
> + struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
Please reorder these definitions, (columns) longest first, shortest last
>
> if (state->gamma_lut) {
> + u32 table_size;
> + u32 mask;
> + u32 lut_bits;
> + u32 shift_bits;
> + bool lut_diff;
> + struct drm_color_lut color, color_rec;
> + struct drm_color_lut *lut = (struct drm_color_lut *)state->gamma_lut;
struct drm_color_lut *lut = (struct drm_color_lut *)state->gamma_lut;
struct drm_color_lut color, color_rec;
u32 lut_bits, shift_bits;
u32 mask, table_size;
bool lut_diff;
> +
> + table_size = gamma->data->lut_size;
> + lut_bits = gamma->data->lut_bits;
> + lut_diff = gamma->data->lut_diff;
> + shift_bits = (lut_bits == 12) ? 4 : 6;
> + mask = GENMASK(lut_bits - 1, 0);
> reg = readl(regs + DISP_GAMMA_CFG);
> + reg = reg & ~RELAY_MODE;
> reg = reg | GAMMA_LUT_EN;
> writel(reg, regs + DISP_GAMMA_CFG);
> lut_base = regs + DISP_GAMMA_LUT;
> - lut = (struct drm_color_lut *)state->gamma_lut->data;
> - for (i = 0; i < MTK_LUT_SIZE; i++) {
> -
> - if (!lut_diff || (i % 2 == 0)) {
> - word = (((lut[i].red >> 6) & LUT_10BIT_MASK) << 20) +
> - (((lut[i].green >> 6) & LUT_10BIT_MASK) << 10) +
> - ((lut[i].blue >> 6) & LUT_10BIT_MASK);
> + lut1_base = regs + DISP_GAMMA_LUT1;
> + for (i = 0; i < table_size; i++) {
> + color.red = (lut[i].red >> shift_bits) & mask;
> + color.green = (lut[i].green >> shift_bits) & mask;
> + color.blue = (lut[i].blue >> shift_bits) & mask;
> + if (lut_diff && (i % 2)) {
> + word = (lut_bits == 12) ?
> + (((color.green - color_rec.green) << 12) +
> + (color.red - color_rec.red))
> + :
> + (((color.red - color_rec.red) << 20) +
> + ((color.green - color_rec.green) << 10) +
> + (color.blue - color_rec.blue));
> + word1 = (color.blue - color_rec.blue);
> } else {
> - diff[0] = (lut[i].red >> 6) - (lut[i - 1].red >> 6);
> - diff[1] = (lut[i].green >> 6) - (lut[i - 1].green >> 6);
> - diff[2] = (lut[i].blue >> 6) - (lut[i - 1].blue >> 6);
> -
> - word = ((diff[0] & LUT_10BIT_MASK) << 20) +
> - ((diff[1] & LUT_10BIT_MASK) << 10) +
> - (diff[2] & LUT_10BIT_MASK);
> + word = (lut_bits == 12) ?
> + ((color.green << 12) + color.red)
> + :
> + ((color.red << 20) +
> + (color.green << 10) + color.blue);
> + word1 = color.blue;
> + color_rec = color;
> }
> - writel(word, (lut_base + i * 4));
> + idx = (lut_bits == 12) ? (i % BANK_SIZE) : i;
> + writel(word, (lut_base + idx * 4));
> + if (!(i % BANK_SIZE) && lut_bits == 12)
> + writel((i / BANK_SIZE), regs + DISP_GAMMA_BANK);
> + if (lut_bits == 12)
> + writel(word1, (lut1_base + idx * 4));
> }
> }
> }
>
> +unsigned int mtk_gamma_size(struct device *dev)
unsigned int mtk_gamma_get_lut_size(struct device *dev)
that looks a bit more readable and perfectly explains this function :-)
> +{
> + struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
> +
> + if (gamma->data)
> + return gamma->data->lut_size;
> + else
> + return 0;
> +}
> void mtk_gamma_set(struct device *dev, struct drm_crtc_state *state)
> {
> struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
..snip..
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> index 2d72cc5ddaba..4c6538a17b88 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> @@ -323,6 +323,7 @@ static const struct mtk_ddp_comp_funcs ddp_gamma = {
> .clk_enable = mtk_gamma_clk_enable,
> .clk_disable = mtk_gamma_clk_disable,
> .gamma_set = mtk_gamma_set,
> + .gamma_size = mtk_gamma_size,
> .config = mtk_gamma_config,
> .start = mtk_gamma_start,
> .stop = mtk_gamma_stop,
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> index 2d0052c23dcb..bf0cf7f86010 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> @@ -59,6 +59,7 @@ struct mtk_ddp_comp_funcs {
> void (*disable_vblank)(struct device *dev);
> unsigned int (*supported_rotations)(struct device *dev);
> unsigned int (*layer_nr)(struct device *dev);
> + unsigned int (*gamma_size)(struct device *dev);
unsigned int (*gamma_get_lut_size)(struct device *dev);
> int (*layer_check)(struct device *dev,
> unsigned int idx,
> struct mtk_plane_state *state);
Regards,
Angelo
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