linux-kernel - Re: [PATCH v2] drm/vkms: Add YUV410, YUV411, YVU410, and YVU411 support

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Message-ID: <4e8f0724-d747-4712-854c-c231a31e9e2c@bootlin.com>
Date: Fri, 6 Feb 2026 14:53:34 +0100
From: Louis Chauvet <louis.chauvet@...tlin.com>
To: Renjun Wang <renjunw0@...mail.com>, hamohammed.sa@...il.com,
 simona@...ll.ch, melissa.srw@...il.com, maarten.lankhorst@...ux.intel.com,
 mripard@...nel.org, tzimmermann@...e.de, airlied@...il.com,
 dri-devel@...ts.freedesktop.org
Cc: linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drm/vkms: Add YUV410, YUV411, YVU410, and YVU411
 support



On 2/2/26 16:11, Renjun Wang wrote:
> Add support for the following planar YUV formats:
> - DRM_FORMAT_YUV410
> - DRM_FORMAT_YUV411
> - DRM_FORMAT_YVU410
> - DRM_FORMAT_YVU411
> 
> These formats are handled by the existing planar_yuv_read_line()
> function, which correctly handles the subsampling defined in each
> format's drm_format_info.
> 
> The YVU variants (YVU410, YVU411) are also added to
> get_conversion_matrix_to_argb_u16() to ensure the U and V columns
> are swapped correctly in the conversion matrix.

Reviewed-by: Louis Chauvet <louis.chauvet@...tlin.com>

> v2:
>   - update vkms_formats[] to add new formats.
> 
> Signed-off-by: Renjun Wang <renjunw0@...mail.com>
> ---
>   drivers/gpu/drm/vkms/vkms_formats.c | 6 ++++++
>   drivers/gpu/drm/vkms/vkms_plane.c   | 4 ++++
>   2 files changed, 10 insertions(+)
> 
> diff --git a/drivers/gpu/drm/vkms/vkms_formats.c b/drivers/gpu/drm/vkms/vkms_formats.c
> index dfb8e13cba87..5ef5d49a44ef 100644
> --- a/drivers/gpu/drm/vkms/vkms_formats.c
> +++ b/drivers/gpu/drm/vkms/vkms_formats.c
> @@ -730,9 +730,13 @@ pixel_read_line_t get_pixel_read_line_function(u32 format)
>   	case DRM_FORMAT_P012:
>   	case DRM_FORMAT_P016:
>   		return &YUV161616_semiplanar_read_line;
> +	case DRM_FORMAT_YUV410:
> +	case DRM_FORMAT_YUV411:
>   	case DRM_FORMAT_YUV420:
>   	case DRM_FORMAT_YUV422:
>   	case DRM_FORMAT_YUV444:
> +	case DRM_FORMAT_YVU410:
> +	case DRM_FORMAT_YVU411:
>   	case DRM_FORMAT_YVU420:
>   	case DRM_FORMAT_YVU422:
>   	case DRM_FORMAT_YVU444:
> @@ -921,6 +925,8 @@ void get_conversion_matrix_to_argb_u16(u32 format,
>   	memcpy(matrix, matrix_to_copy, sizeof(*matrix_to_copy));
>   
>   	switch (format) {
> +	case DRM_FORMAT_YVU410:
> +	case DRM_FORMAT_YVU411:
>   	case DRM_FORMAT_YVU420:
>   	case DRM_FORMAT_YVU422:
>   	case DRM_FORMAT_YVU444:
> diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
> index 19fe6acad306..44773a82fbfd 100644
> --- a/drivers/gpu/drm/vkms/vkms_plane.c
> +++ b/drivers/gpu/drm/vkms/vkms_plane.c
> @@ -35,9 +35,13 @@ static const u32 vkms_formats[] = {
>   	DRM_FORMAT_NV21,
>   	DRM_FORMAT_NV61,
>   	DRM_FORMAT_NV42,
> +	DRM_FORMAT_YUV410,
> +	DRM_FORMAT_YUV411,
>   	DRM_FORMAT_YUV420,
>   	DRM_FORMAT_YUV422,
>   	DRM_FORMAT_YUV444,
> +	DRM_FORMAT_YVU410,
> +	DRM_FORMAT_YVU411,
>   	DRM_FORMAT_YVU420,
>   	DRM_FORMAT_YVU422,
>   	DRM_FORMAT_YVU444,