linux-kernel - Re: [PATCH v4 2/8] drm/vkms: Add support for ARGB8888 formats

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Message-ID: <115564ae-4b61-47be-9a9d-9c27acd4192c@bootlin.com>
Date: Fri, 13 Jun 2025 19:28:49 +0200
From: Louis Chauvet <louis.chauvet@...tlin.com>
To: Maíra Canal <mcanal@...lia.com>,
 Melissa Wen <melissa.srw@...il.com>, Maíra Canal
 <mairacanal@...eup.net>, Haneen Mohammed <hamohammed.sa@...il.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Rodrigo Siqueira <siqueira@...lia.com>,
 Simona Vetter <simona.vetter@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org, arthurgrillo@...eup.net,
 linux-kernel@...r.kernel.org, jeremie.dautheribes@...tlin.com,
 miquel.raynal@...tlin.com, thomas.petazzoni@...tlin.com,
 seanpaul@...gle.com, nicolejadeyee@...gle.com
Subject: Re: [PATCH v4 2/8] drm/vkms: Add support for ARGB8888 formats



Le 11/06/2025 à 21:55, Maíra Canal a écrit :
> Hi Louis,
> 
> On 5/30/25 11:05, Louis Chauvet wrote:
>> The formats XRGB8888 and ARGB8888 were already supported.
>> Add the support for:
>> - XBGR8888
>> - RGBX8888
>> - BGRX8888
>> - ABGR8888
>> - RGBA8888
>> - BGRA8888
>>
>> Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
>> ---
> 
> [...]
> 
>> +READ_LINE_ARGB8888(RGBX8888_read_line, px, 0xFF, px[3], px[2], px[1])
>> +READ_LINE_ARGB8888(BGRX8888_read_line, px, 0xFF, px[1], px[2], px[3])
> 
> How did you test those two formats? I noticed that IGT (kms_plane tests)
> doesn't test them.

Hi Maíra,

Thanks for your review!

I wrote this a long time ago, so I don't remember. I was probably greedy 
and added all the "trivial" formats I was able to do and missed that 
this format was not tested.

For this revision, I just started kms_plane to check if it was happy 
after the rebase, I did not check the formats one by one.

Do you want me to remove those formats? I think it costs nothing to keep 
them, especially with the new READ_LINE_ARGB8888 macro, but I will 
comply if you think we should only merge tested formats.

Thanks,
Louis Chauvet

> Best Regards,
> - Maíra
> 
>>    
>>    READ_LINE_ARGB8888(ARGB8888_read_line, px, px[3], px[2], px[1], px[0])
>>    READ_LINE_ARGB8888(ABGR8888_read_line, px, px[3], px[0], px[1], px[2])
>> +READ_LINE_ARGB8888(RGBA8888_read_line, px, px[0], px[3], px[2], px[1])
>> +READ_LINE_ARGB8888(BGRA8888_read_line, px, px[0], px[1], px[2], px[3])
>>    
>>    READ_LINE_le16161616(ARGB16161616_read_line, px, px[3], px[2], px[1], px[0])
>>    READ_LINE_le16161616(XRGB16161616_read_line, px, cpu_to_le16(0xFFFF), px[2], px[1], px[0])
>> @@ -644,10 +649,20 @@ pixel_read_line_t get_pixel_read_line_function(u32 format)
>>    	switch (format) {
>>    	case DRM_FORMAT_ARGB8888:
>>    		return &ARGB8888_read_line;
>> -	case DRM_FORMAT_XRGB8888:
>> -		return &XRGB8888_read_line;
>>    	case DRM_FORMAT_ABGR8888:
>>    		return &ABGR8888_read_line;
>> +	case DRM_FORMAT_BGRA8888:
>> +		return &BGRA8888_read_line;
>> +	case DRM_FORMAT_RGBA8888:
>> +		return &RGBA8888_read_line;
>> +	case DRM_FORMAT_XRGB8888:
>> +		return &XRGB8888_read_line;
>> +	case DRM_FORMAT_XBGR8888:
>> +		return &XBGR8888_read_line;
>> +	case DRM_FORMAT_RGBX8888:
>> +		return &RGBX8888_read_line;
>> +	case DRM_FORMAT_BGRX8888:
>> +		return &BGRX8888_read_line;
>>    	case DRM_FORMAT_ARGB16161616:
>>    		return &ARGB16161616_read_line;
>>    	case DRM_FORMAT_XRGB16161616:
>> diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
>> index e3fdd161d0f0..b7f498944c50 100644
>> --- a/drivers/gpu/drm/vkms/vkms_plane.c
>> +++ b/drivers/gpu/drm/vkms/vkms_plane.c
>> @@ -14,8 +14,13 @@
>>    
>>    static const u32 vkms_formats[] = {
>>    	DRM_FORMAT_ARGB8888,
>> -	DRM_FORMAT_XRGB8888,
>>    	DRM_FORMAT_ABGR8888,
>> +	DRM_FORMAT_BGRA8888,
>> +	DRM_FORMAT_RGBA8888,
>> +	DRM_FORMAT_XRGB8888,
>> +	DRM_FORMAT_XBGR8888,
>> +	DRM_FORMAT_RGBX8888,
>> +	DRM_FORMAT_BGRX8888,
>>    	DRM_FORMAT_XRGB16161616,
>>    	DRM_FORMAT_ARGB16161616,
>>    	DRM_FORMAT_RGB565,
>>
> 

-- 
Louis Chauvet, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com