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Message-ID: <a9e026c2018668057b8482c27eeae991667c46d3.camel@mediatek.com>
Date: Tue, 26 Apr 2022 09:58:24 +0800
From: CK Hu <ck.hu@...iatek.com>
To: Yongqiang Niu <yongqiang.niu@...iatek.com>,
Chun-Kuang Hu <chunkuang.hu@...nel.org>
CC: Yongqiang Niu <yongqiang.niu@...iatek.corp-partner.google.com>,
<devicetree@...r.kernel.org>,
<Project_Global_Chrome_Upstream_Group@...iatek.com>,
David Airlie <airlied@...ux.ie>,
Jassi Brar <jassisinghbrar@...il.com>,
<linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
"Dennis YC Hsieh" <dennis-yc.hsieh@...iatek.com>,
Fabien Parent <fparent@...libre.com>,
Rob Herring <robh+dt@...nel.org>,
<linux-mediatek@...ts.infradead.org>,
Hsin-Yi Wang <hsinyi@...omium.org>,
Matthias Brugger <matthias.bgg@...il.com>,
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v1, 1/1] drm/mediatek: add lut diff flag for new gamma
hardware support
Hi, Yongqiang:
On Wed, 2022-04-20 at 21:06 +0800, Yongqiang Niu wrote:
> From: Yongqiang Niu <yongqiang.niu@...iatek.corp-partner.google.com>
>
> mt8183 gamma module usage is different with before soc,
> gamma odd(index start from 0) lut value set to hardware
> register should be
> the difference of current lut value with last lut value.
>
> gamma function support both increase and decrease lut.
How to set decrease lut?
Original lut:
12 10 8 6 4 2
Does diff lut look like this?
12 [2] 8 [2] 4 [2]
How does hardware know that this is increase lut or decrease lut?
> chrome os app set increase lut normally.
>
> for increase lut example, chrome os user space set lut
> like this(only r chanel for example):
> 2 4 6 8 10 12.
> 1) mt8183 gamma driver should set the gamma lut to hardware
> register like this:
> 2 [2] 6 [8] 10 [2]
2 [2] 6 [2] 10 [2]
> the value with [] is the difference value
> 2) gamma hardware will restore the lut when apply gamma
> function to display
I don't know why do you mention the 'restore', any modification is
related to this?
>
> Signed-off-by: Yongqiang Niu <
> yongqiang.niu@...iatek.corp-partner.google.com>
> ---
> drivers/gpu/drm/mediatek/mtk_disp_aal.c | 4 ++-
> drivers/gpu/drm/mediatek/mtk_disp_drv.h | 2 +-
> drivers/gpu/drm/mediatek/mtk_disp_gamma.c | 34 +++++++++++++++++++
> ----
> 3 files changed, 32 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_aal.c
> b/drivers/gpu/drm/mediatek/mtk_disp_aal.c
> index f46d4ab73d6a..e6378b074a17 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_aal.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_aal.c
> @@ -23,6 +23,7 @@
>
> struct mtk_disp_aal_data {
> bool has_gamma;
> + bool lut_diff;
> };
>
> /**
> @@ -66,7 +67,7 @@ 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);
> + mtk_gamma_set_common(aal->regs, state, aal->data-
> >lut_diff);
gamma in aal does not support diff lut, so this would make things
simple.
mtk_gamma_set_common(aal->regs, state, false);
Regards,
CK
> }
>
> void mtk_aal_start(struct device *dev)
> @@ -148,6 +149,7 @@ static int mtk_disp_aal_remove(struct
> platform_device *pdev)
>
> static const struct mtk_disp_aal_data mt8173_aal_driver_data = {
> .has_gamma = true,
> + .lut_diff = false,
> };
>
> static const struct of_device_id mtk_disp_aal_driver_dt_match[] = {
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> index 86c3068894b1..3380651c6707 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> @@ -51,7 +51,7 @@ void mtk_gamma_config(struct device *dev, unsigned
> int w,
> unsigned int h, unsigned int vrefresh,
> unsigned int bpc, struct cmdq_pkt *cmdq_pkt);
> 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);
> +void mtk_gamma_set_common(void __iomem *regs, struct drm_crtc_state
> *state, bool lut_diff);
> 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 3a5815ab4079..fec2e9a5b60d 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> @@ -27,6 +27,7 @@
>
> struct mtk_disp_gamma_data {
> bool has_dither;
> + bool lut_diff;
> };
>
> /*
> @@ -53,12 +54,13 @@ 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)
> +void mtk_gamma_set_common(void __iomem *regs, struct drm_crtc_state
> *state, bool lut_diff)
> {
> unsigned int i, reg;
> struct drm_color_lut *lut;
> void __iomem *lut_base;
> u32 word;
> + u32 diff[3] = {0};
>
> if (state->gamma_lut) {
> reg = readl(regs + DISP_GAMMA_CFG);
> @@ -67,9 +69,20 @@ void mtk_gamma_set_common(void __iomem *regs,
> struct drm_crtc_state *state)
> lut_base = regs + DISP_GAMMA_LUT;
> lut = (struct drm_color_lut *)state->gamma_lut->data;
> for (i = 0; i < MTK_LUT_SIZE; i++) {
> - word = (((lut[i].red >> 6) & LUT_10BIT_MASK) <<
> 20) +
> - (((lut[i].green >> 6) & LUT_10BIT_MASK)
> << 10) +
> - ((lut[i].blue >> 6) & LUT_10BIT_MASK);
> +
> + 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);
> + } else {
> + diff[0] = abs((lut[i].red >> 6) -
> (lut[i - 1].red >> 6));
> + diff[1] = abs((lut[i].green >> 6) -
> (lut[i - 1].green >> 6));
> + diff[2] = abs((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);
> + }
> writel(word, (lut_base + i * 4));
> }
> }
> @@ -78,8 +91,12 @@ void mtk_gamma_set_common(void __iomem *regs,
> struct drm_crtc_state *state)
> void mtk_gamma_set(struct device *dev, struct drm_crtc_state *state)
> {
> struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
> + bool lut_diff = false;
> +
> + if (gamma->data)
> + lut_diff = gamma->data->lut_diff;
>
> - mtk_gamma_set_common(gamma->regs, state);
> + mtk_gamma_set_common(gamma->regs, state, lut_diff);
> }
>
> void mtk_gamma_config(struct device *dev, unsigned int w,
> @@ -176,10 +193,15 @@ static const struct mtk_disp_gamma_data
> mt8173_gamma_driver_data = {
> .has_dither = true,
> };
>
> +static const struct mtk_disp_gamma_data mt8183_gamma_driver_data = {
> + .lut_diff = true,
> +};
> +
> static const struct of_device_id mtk_disp_gamma_driver_dt_match[] =
> {
> { .compatible = "mediatek,mt8173-disp-gamma",
> .data = &mt8173_gamma_driver_data},
> - { .compatible = "mediatek,mt8183-disp-gamma"},
> + { .compatible = "mediatek,mt8183-disp-gamma",
> + .data = &mt8183_gamma_driver_data},
> {},
> };
> MODULE_DEVICE_TABLE(of, mtk_disp_gamma_driver_dt_match);
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