Re: [PATCH RESEND v3 3/9] drm/mediatek: Adjust mtk_drm_gamma_set_common parameters

Re: [PATCH RESEND v3 3/9] drm/mediatek: Adjust mtk_drm_gamma_set_common parameters

[Jason-JH Lin]

Hi CK, 

Thanks for the reviews.

On Mon, 2022-09-12 at 10:48 +0800, CK Hu wrote:
> Hi, Jason:
> 
> On Mon, 2022-09-12 at 09:30 +0800, Jason-JH.Lin wrote:
> > Adjust the parameters in mtk_drm_gamma_set_common()
> >   - add (struct device *dev) to get lut_diff from gamma's driver
> > data
> >   - remove (bool lut_diff) and use false as default value in the
> > function
> > 
> > Fixes: 051524cbe62d ("FROMGIT: drm/mediatek: Add lut diff flag for
> > new gamma hardware support")
> > Signed-off-by: Jason-JH.Lin <jason-jh.lin@mediatek.com>
> > ---
> >  drivers/gpu/drm/mediatek/mtk_disp_aal.c   |  2 +-
> >  drivers/gpu/drm/mediatek/mtk_disp_drv.h   |  2 +-
> >  drivers/gpu/drm/mediatek/mtk_disp_gamma.c | 13 +++++++------
> >  3 files changed, 9 insertions(+), 8 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/mediatek/mtk_disp_aal.c
> > b/drivers/gpu/drm/mediatek/mtk_disp_aal.c
> > index 0f9d7efb61d7..6517e0a5a7d8 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(NULL, aal->regs, state);
> >  }
> >  
> >  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..a83e5fbc8724 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> > +++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> > @@ -52,7 +52,7 @@ 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, bool lut_diff);
> > +void mtk_gamma_set_common(struct device *dev, void __iomem *regs,
> > struct drm_crtc_state *state);
> 
> This function is called by both aal and gamma driver, so I would like
> to pass struct device dev because priv data of aal and gamma are
> different. Make this function command for both aal and gamma driver.
> 
> Regards,
> CK
> 
I think handle the priv data of AAL in the gamma_set_common function
will make this function coupling with AAL.
So I'll drop this patch and move the gamma priv data to gamma_set and
just pass the necessary parameters for gamma_set_common.


Regards,
Jason-JH.Lin
> >  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..f54a6a618348 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> > @@ -54,14 +54,19 @@ 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(struct device *dev, void __iomem *regs,
> > struct drm_crtc_state *state)
> >  {
> > +	struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
> > +	bool lut_diff = false;
> >  	unsigned int i, reg;
> >  	struct drm_color_lut *lut;
> >  	void __iomem *lut_base;
> >  	u32 word;
> >  	u32 diff[3] = {0};
> >  
> > +	if (gamma && gamma->data)
> > +		lut_diff = gamma->data->lut_diff;
> > +
> >  	if (state->gamma_lut) {
> >  		reg = readl(regs + DISP_GAMMA_CFG);
> >  		reg = reg | GAMMA_LUT_EN;
> > @@ -91,12 +96,8 @@ void mtk_gamma_set_common(void __iomem *regs,
> > struct drm_crtc_state *state, bool
> >  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, lut_diff);
> > +	mtk_gamma_set_common(dev, gamma->regs, state);
> >  }
> >  
> >  void mtk_gamma_config(struct device *dev, unsigned int w,
> 
> 
-- 
Jason-JH Lin <jason-jh.lin@mediatek.com>

Re: [PATCH RESEND v3 4/9] drm/mediatek: Add gamma support different lut_size for other SoC

[Jason-JH Lin]

Hi CK,

Thanks for the reviews.

On Mon, 2022-09-12 at 11:14 +0800, CK Hu wrote:
> Hi, Jason:
> 
> On Mon, 2022-09-12 at 09:30 +0800, Jason-JH.Lin wrote:
> > 1. Add mtk_drm_gamma_get_lut_size() and remove MTK_LUT_SIZE macro.
> > 2. Add lut_size to gamma driver data for different SoC.
> 
> Separate these two modification to two patches. In the patch of
> mtk_drm_gamma_get_lut_size(), consider the aal driver.
> 
> Regards,
> CK

OK, I'll separate them.

Regards,
Jason-JH.Lin

Re: [PATCH RESEND v3 5/9] drm/mediatek: Add gamma support different lut_bits for other SoC

[Jason-JH Lin]

Hi CK,

Thanks for the reviews.

On Mon, 2022-09-12 at 11:40 +0800, CK Hu wrote:
> Hi, Jason:
> 
> On Mon, 2022-09-12 at 09:30 +0800, Jason-JH.Lin wrote:
> > Add lut_bits in gamma driver data for each SoC and adjust the usage
> > of lut_bits in mtk_drm_gamma_set_common().
> > 
> > Signed-off-by: Jason-JH.Lin <jason-jh.lin@mediatek.com>
> > ---
> >  drivers/gpu/drm/mediatek/mtk_disp_gamma.c | 36 ++++++++++++++++---
> > --
> > --
> >  1 file changed, 25 insertions(+), 11 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> > b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> > index 0a1022032b71..be82d15a5204 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> > @@ -25,11 +25,14 @@
> >  
> >  #define LUT_10BIT_MASK				0x03ff
> >  #define LUT_SIZE_DEFAULT			512 /* for setting
> > gamma lut from AAL */
> > +#define LUT_BITS_DEFAULT			10
> > +#define LUT_INPUT_BITS				16 /* input lut
> > bit from application */
> 
> I think we should use drm_color_lut_extract() to let the input bits
> transparent. So add one patch to use drm_color_lut_extract(), and
> then
> apply this patch.
> 
> Regards,
> CK

OK, I'll separate it to 2 patches, 1 is using drm_color_lut_extract()
to handle with input lut data and the other is adding gamma support
lut_bits and shift_bits.

Regards,
Jason-JH.Lin

Re: [PATCH RESEND v3 8/9] drm/mediatek: Add clear RELAY_MODE bit to set gamma

[Jason-JH Lin]

Hi CK,

Thanks for the reviews.

On Mon, 2022-09-12 at 10:26 +0800, CK Hu wrote:
> Hi, Jason:
> 
> On Mon, 2022-09-12 at 09:30 +0800, Jason-JH.Lin wrote:
> > Since the bootlaoder may set the RELAY_MODE to gamma be for the
> > kerenl,
> > we have to clear the RELAY_MODE bit to make sure that the gamma is
> > enabled correctly.
> > 
> > Fixes: b10023b03082 ("FROMGIT: drm/mediatek: Separate gamma
> > module")
> 
> Fixes: 69a4237ab1d1 ("drm/mediatek: Separate gamma module")
> 
> and move this patch to the first patch of this series so this patch
> could be picked to early stable branch.
> 
> Regards,
> CK

Ok, I'll move it to the first patch.
Regards,
Jason-JH.Lin

Re: [PATCH RESEND v3 6/9] drm/mediatek: Add gamma support different bank_size for other SoC

[Jason-JH Lin]

Hi CK,

Thanks for the reviews.

On Mon, 2022-09-12 at 13:12 +0800, CK Hu wrote:
> Hi, Jason:
> 
> On Mon, 2022-09-12 at 09:30 +0800, Jason-JH.Lin wrote:
> > Add multiple bank support for mt8195.
> > If bank size is 0 which means no bank support.
> > 
> > Signed-off-by: Jason-JH.Lin <jason-jh.lin@mediatek.com>
> > ---
> >  drivers/gpu/drm/mediatek/mtk_disp_gamma.c | 45 +++++++++++++------
> > ----
> >  1 file changed, 26 insertions(+), 19 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> > b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> > index be82d15a5204..45da2b6206c8 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> > @@ -21,6 +21,7 @@
> >  #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
> > @@ -33,6 +34,7 @@ struct mtk_disp_gamma_data {
> >  	bool lut_diff;
> >  	u16 lut_size;
> >  	u8 lut_bits;
> > +	u16 bank_size;
> >  };
> >  
> >  /*
> > @@ -75,9 +77,10 @@ void mtk_gamma_set_common(struct device *dev,
> > void
> > __iomem *regs, struct drm_crt
> >  	struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
> >  	bool lut_diff = false;
> >  	u16 lut_size = LUT_SIZE_DEFAULT;
> > +	u16 bank_size = lut_size;
> >  	u8 lut_bits = LUT_BITS_DEFAULT;
> >  	u8 shift_bits;
> > -	unsigned int i, reg;
> > +	unsigned int i, j, reg, bank_num;
> >  	struct drm_color_lut *lut;
> >  	void __iomem *lut_base;
> >  	u32 word, mask;
> > @@ -87,8 +90,10 @@ void mtk_gamma_set_common(struct device *dev,
> > void
> > __iomem *regs, struct drm_crt
> >  		lut_diff = gamma->data->lut_diff;
> >  		lut_size = gamma->data->lut_size;
> >  		lut_bits = gamma->data->lut_bits;
> > +		bank_size = gamma->data->bank_size;
> >  	}
> >  
> > +	bank_num = lut_size / bank_size;
> >  	shift_bits = LUT_INPUT_BITS - lut_bits;
> >  	mask = GENMASK(lut_bits - 1, 0);
> >  
> > @@ -98,25 +103,27 @@ void mtk_gamma_set_common(struct device *dev,
> > void __iomem *regs, struct drm_crt
> >  		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 < lut_size; i++) {
> > -
> > -			if (!lut_diff || (i % 2 == 0)) {
> > -				word = (((lut[i].red >> shift_bits) &
> > mask) << 20) +
> > -					(((lut[i].green >> shift_bits)
> > & mask) << 10) +
> > -					((lut[i].blue >> shift_bits) &
> > mask);
> > -			} else {
> > -				diff[0] = (lut[i].red >> shift_bits) -
> > -					  (lut[i - 1].red >>
> > shift_bits);
> > -				diff[1] = (lut[i].green >> shift_bits)
> > -
> > -					  (lut[i - 1].green >>
> > shift_bits);
> > -				diff[2] = (lut[i].blue >> shift_bits) -
> > -					  (lut[i - 1].blue >>
> > shift_bits);
> > -
> > -				word = ((diff[0] & mask) << 20) +
> > -					((diff[1] & mask) << 10) +
> > -					(diff[2] & mask);
> > +		for (j = 0; j < bank_num; j++) {
> > +			writel(j, regs + DISP_GAMMA_BANK);
> 
> Does mt8173 and mt8183 has this register? If not, do not set this
> register in mt8173 and mt8183.
> 
> Regards,
> CK

mt8173 and mt8183 don't have this register, so I'll fix it.

Regards,
Jason-JH.Lin

Re: [PATCH RESEND v3 1/9] dt-bindings: mediatek: modify item formatting for gamma

[Krzysztof Kozlowski]

On 12/09/2022 02:29, Jason-JH.Lin wrote:
> From: "zheng-yan.chen" <zheng-yan.chen@mediatek.com>
> 
> Since the items with only one const should be dedicated as enum,
> merge all such items into one enum item.
> 
> Fixes: 4ed545e7d100 ("dt-bindings: display: mediatek: disp: split each block to individual yaml")
> Signed-off-by: zheng-yan.chen <zheng-yan.chen@mediatek.com>
> Signed-off-by: Jason-JH.Lin <jason-jh.lin@mediatek.com>


Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>


Best regards,
Krzysztof

Re: [PATCH RESEND v3 2/9] dt-bindings: mediatek: Add gamma compatible for mt8195

[Krzysztof Kozlowski]

On 12/09/2022 02:29, Jason-JH.Lin wrote:
> From: "zheng-yan.chen" <zheng-yan.chen@mediatek.com>
> 
> mt8195 uses 10bit-to-12bit gamma-LUT, which is not compatible with
> current 9bit-to-10bit gamma-LUT.
> 
> This patch thus add constant compatible for mt8195, which means that
> mt8195 should only use specified mt8195 gamma driver data.
> 
> Also, delete related compatible from enum, to ensure that
> mt8195 will not accidentally get others' gamma driver data and thus
> cause fatal error.
> 
> Signed-off-by: zheng-yan.chen <zheng-yan.chen@mediatek.com>
> Signed-off-by: Jason-JH.Lin <jason-jh.lin@mediatek.com>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>


Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>


Best regards,
Krzysztof

Re: [PATCH RESEND v3 0/9] Add gamma lut support for mt8195

[AngeloGioacchino Del Regno]

Il 12/09/22 03:29, Jason-JH.Lin ha scritto:
> Since the gamma_set_common() function for previous SoC,
> such as  mt8173 and mt8183, is designed for 9bit-to-10bit
> conversion.
> mt8195 is using 10bit-to-12bit conversion, which is
> not compatible with the previous function.
> 
> Thus, need to update the function to fit the need of mt8195.

Hello,
can you please respin and fix this series on the latest linux-next?

Besides, please test it carefully: as far as I can see, GNOME Night Light
(or others) are not working on MT8195 (color temperature/ccorr).
As for gamma itself, that's not working either; you can test it with a tool
that will create a color profile by applying a new VCGT table, please look
at [1] if you need tools.

We can confirm that color correction works on at least MT8192 (colord), so
it's MT8195 at fault.

[1]: https://github.com/zb3/gnome-gamma-tool

Regards,
Angelo

> ---
> Change in RESEND v3:
> Fix build warning
>>> drivers/gpu/drm/mediatek/mtk_disp_gamma.c:59:14: warning: no previous prototype for 'mtk_gamma_get_size' [-Wmissing-prototypes]
> 
> Change in v3:
> 1. separate 1 dt-binding patch to 2 patches, 1 is for modifying
>     multiple items list to one and 1 is for moving mt8195 compatible.
> 2. redefine variables to reduce memory usage.
> 3. delete unused symbols.
> 4. separate 1 drm/mediatek patch to 6 patches.
> 5. rebase on tag 'next-20220909'
> 
> Jason-JH.Lin (5):
>    drm/mediatek: Adjust mtk_drm_gamma_set_common parameters
>    drm/mediatek: Add gamma support different lut_size for other SoC
>    drm/mediatek: Add gamma support different lut_bits for other SoC
>    drm/mediatek: Add gamma support different bank_size for other SoC
>    drm/mediatek: Add clear RELAY_MODE bit to set gamma
> 
> zheng-yan.chen (4):
>    dt-bindings: mediatek: modify item formatting for gamma
>    dt-bindings: mediatek: Add gamma compatible for mt8195
>    drm/mediatek: Add gamma lut support for mt8195
>    arm64: dts: Modify gamma compatible for mt8195
> 
>   .../display/mediatek/mediatek,gamma.yaml      |   8 +-
>   arch/arm64/boot/dts/mediatek/mt8195.dtsi      |   2 +-
>   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     | 115 ++++++++++++++----
>   drivers/gpu/drm/mediatek/mtk_drm_crtc.c       |   4 +-
>   drivers/gpu/drm/mediatek/mtk_drm_crtc.h       |   1 -
>   drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h   |   9 ++
>   8 files changed, 109 insertions(+), 35 deletions(-)
> 

Re: [PATCH RESEND v3 6/9] drm/mediatek: Add gamma support different bank_size for other SoC

[AngeloGioacchino Del Regno]

Il 12/09/22 03:30, Jason-JH.Lin ha scritto:
> Add multiple bank support for mt8195.
> If bank size is 0 which means no bank support.
> 
> Signed-off-by: Jason-JH.Lin <jason-jh.lin@mediatek.com>
> ---
>   drivers/gpu/drm/mediatek/mtk_disp_gamma.c | 45 +++++++++++++----------
>   1 file changed, 26 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> index be82d15a5204..45da2b6206c8 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c
> @@ -21,6 +21,7 @@
>   #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
> @@ -33,6 +34,7 @@ struct mtk_disp_gamma_data {
>   	bool lut_diff;
>   	u16 lut_size;
>   	u8 lut_bits;
> +	u16 bank_size;
>   };
>   
>   /*
> @@ -75,9 +77,10 @@ void mtk_gamma_set_common(struct device *dev, void __iomem *regs, struct drm_crt
>   	struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
>   	bool lut_diff = false;
>   	u16 lut_size = LUT_SIZE_DEFAULT;
> +	u16 bank_size = lut_size;

Just use gamma->data->bank_size directly, as platform data is always present.

>   	u8 lut_bits = LUT_BITS_DEFAULT;
>   	u8 shift_bits;
> -	unsigned int i, reg;
> +	unsigned int i, j, reg, bank_num;
>   	struct drm_color_lut *lut;
>   	void __iomem *lut_base;
>   	u32 word, mask;
> @@ -87,8 +90,10 @@ void mtk_gamma_set_common(struct device *dev, void __iomem *regs, struct drm_crt
>   		lut_diff = gamma->data->lut_diff;
>   		lut_size = gamma->data->lut_size;
>   		lut_bits = gamma->data->lut_bits;
> +		bank_size = gamma->data->bank_size;

You shall set bank_size = 512 to MT8173 and MT8183, otherwise they break, as this
will set bank_size to 0.

>   	}
>   
> +	bank_num = lut_size / bank_size;
>   	shift_bits = LUT_INPUT_BITS - lut_bits;
>   	mask = GENMASK(lut_bits - 1, 0);
>   

Regards,
Angelo

Re: [PATCH RESEND v3 0/9] Add gamma lut support for mt8195

[AngeloGioacchino Del Regno]

Il 26/04/23 13:43, AngeloGioacchino Del Regno ha scritto:
> Il 12/09/22 03:29, Jason-JH.Lin ha scritto:
>> Since the gamma_set_common() function for previous SoC,
>> such as  mt8173 and mt8183, is designed for 9bit-to-10bit
>> conversion.
>> mt8195 is using 10bit-to-12bit conversion, which is
>> not compatible with the previous function.
>>
>> Thus, need to update the function to fit the need of mt8195.
> 
> Hello,
> can you please respin and fix this series on the latest linux-next?
> 
> Besides, please test it carefully: as far as I can see, GNOME Night Light
> (or others) are not working on MT8195 (color temperature/ccorr).
> As for gamma itself, that's not working either; you can test it with a tool
> that will create a color profile by applying a new VCGT table, please look
> at [1] if you need tools.
> 
> We can confirm that color correction works on at least MT8192 (colord), so
> it's MT8195 at fault.
> 
> [1]: https://github.com/zb3/gnome-gamma-tool
> 

Nevermind. I've actually fixed this code and refactored it a bit as well.

I'll push my own version soon. No action required.

Regards,
Angelo

Re: [PATCH RESEND v3 0/9] Add gamma lut support for mt8195

[Jason-JH Lin (林睿祥)]

Hi Angelo,


On Thu, 2023-04-27 at 17:15 +0200, AngeloGioacchino Del Regno wrote:
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
> 
> 
> Il 26/04/23 13:43, AngeloGioacchino Del Regno ha scritto:
> > Il 12/09/22 03:29, Jason-JH.Lin ha scritto:
> > > Since the gamma_set_common() function for previous SoC,
> > > such as  mt8173 and mt8183, is designed for 9bit-to-10bit
> > > conversion.
> > > mt8195 is using 10bit-to-12bit conversion, which is
> > > not compatible with the previous function.
> > > 
> > > Thus, need to update the function to fit the need of mt8195.
> > 
> > Hello,
> > can you please respin and fix this series on the latest linux-next?
> > 
> > Besides, please test it carefully: as far as I can see, GNOME Night
> > Light
> > (or others) are not working on MT8195 (color temperature/ccorr).
> > As for gamma itself, that's not working either; you can test it
> > with a tool
> > that will create a color profile by applying a new VCGT table,
> > please look
> > at [1] if you need tools.
> > 
> > We can confirm that color correction works on at least MT8192
> > (colord), so
> > it's MT8195 at fault.
> > 
> > [1]: 
> > https://urldefense.com/v3/__https://github.com/zb3/gnome-gamma-tool__;!!CTRNKA9wMg0ARbw!ib5vs_mqKWlyC8VbLNZbc4Fc0-e6dL5Z-OM5pLsVRnQOWAckR6ETV1mRYRkz-5rKB7fdYvY4LrYoHKDlv6jPSKzoC-245JTYaQ$
> > 
> 
> Nevermind. I've actually fixed this code and refactored it a bit as
> well.
> 
> I'll push my own version soon. No action required.
> 
> Regards,
> Angelo
> 

OK~
Thanks for your great help! :)

Regards,
Jason-JH.Lin