linux-kernel - Re: [PATCH v6 1/2] drm/mediatek: ovl: Add blend

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Message-ID: <d3cfc62e-5c79-48ef-b86e-28dc9c17012c@collabora.com>
Date: Thu, 26 Sep 2024 11:50:07 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Jason-JH Lin (林睿祥) <Jason-JH.Lin@...iatek.com>,
 CK Hu (胡俊光) <ck.hu@...iatek.com>,
 "alpernebiyasak@...il.com" <alpernebiyasak@...il.com>,
 "chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
 Singo Chang (張興國) <Singo.Chang@...iatek.com>,
 Shawn Sung (宋孝謙) <Shawn.Sung@...iatek.com>,
 Nancy Lin (林欣螢) <Nancy.Lin@...iatek.com>,
 "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
 Project_Global_Chrome_Upstream_Group
 <Project_Global_Chrome_Upstream_Group@...iatek.com>,
 "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v6 1/2] drm/mediatek: ovl: Add blend_modes to driver data

Il 26/09/24 11:49, Jason-JH Lin (林睿祥) ha scritto:
> On Thu, 2024-09-26 at 09:30 +0000, CK Hu (胡俊光) wrote:
>> Hi, Jason:
>>
>> On Thu, 2024-09-26 at 16:35 +0800, Jason-JH.Lin wrote:
>>> OVL_CON_CLRFMT_MAN is a configuration for extending color format
>>> settings of DISP_REG_OVL_CON(n).
>>> It will change some of the original color format settings.
>>>
>>> Take the settings of (3 << 12) for example.
>>> - If OVL_CON_CLRFMT_MAN = 0 means OVL_CON_CLRFMT_RGBA8888.
>>> - If OVL_CON_CLRFMT_MAN = 1 means OVL_CON_CLRFMT_PARGB8888.
>>>
>>> Since previous SoCs did not support OVL_CON_CLRFMT_MAN, this means
>>> that the SoC does not support the premultiplied color format.
>>> It will break the original color format setting of MT8173.
>>>
>>> Therefore, the blend_modes is added to the driver data and then
>>> mtk_ovl_fmt_convert() will check the blend_modes to see if
>>> premultiplied supported in current platform.
>>> If it is not supported, use coverage mode to set it to the
>>> supported
>>> color formats to solve the degradation problem.
>>>
>>> Fixes: a3f7f7ef4bfe ("drm/mediatek: Support "Pre-multiplied"
>>> blending in OVL")
>>> Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
>>> Tested-by: Alper Nebi Yasak <alpernebiyasak@...il.com>
>>> Reviewed-by: AngeloGioacchino Del Regno <
>>> angelogioacchino.delregno@...labora.com>
>>
>> This version has difference over 50% with previous version.
>> It's better to drop these tested-by and reviewed-by tag.
> 
> OK, I'll drop this.
> 

You can keep my R-b tag on this one, I checked it.

Cheers,
Angelo

>>
>>> ---
>>>   drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 41 ++++++++++++++++++++-
>>> ----
>>>   1 file changed, 34 insertions(+), 7 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
>>> b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
>>> index 89b439dcf3a6..0cf7b80f612e 100644
>>> --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
>>> +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
>>> @@ -146,6 +146,7 @@ struct mtk_disp_ovl_data {
>>>   	bool fmt_rgb565_is_0;
>>>   	bool smi_id_en;
>>>   	bool supports_afbc;
>>> +	const u32 blend_modes;
>>>   	const u32 *formats;
>>>   	size_t num_formats;
>>>   	bool supports_clrfmt_ext;
>>> @@ -386,14 +387,23 @@ void mtk_ovl_layer_off(struct device *dev,
>>> unsigned int idx,
>>>   		      DISP_REG_OVL_RDMA_CTRL(idx));
>>>   }
>>>   
>>> -static unsigned int ovl_fmt_convert(struct mtk_disp_ovl *ovl,
>>> unsigned int fmt,
>>> -				    unsigned int blend_mode)
>>> +static unsigned int mtk_ovl_fmt_convert(struct mtk_disp_ovl *ovl,
>>> +					struct mtk_plane_state *state)
>>>   {
>>> -	/* The return value in switch "MEM_MODE_INPUT_FORMAT_XXX"
>>> -	 * is defined in mediatek HW data sheet.
>>> -	 * The alphabet order in XXX is no relation to data
>>> -	 * arrangement in memory.
>>
>> I don't know why you drop these comment.
>> Without this modification,
> 
> Since we change the MACRO to align this to DRM input format order, this
> comment is no longer needed.
> 
> I'll send another patch for this.
> Thanks for such a quick reply!
> 
> Regards,
> Jason-JH.Lin
> 
>>
>> Reviewed-by: CK Hu <ck.hu@...iatek.com>
>>