Re: [PATCH 0/2] YUV support for VOP2 background color

[Cristian Ciocaltea <cristian.ciocaltea@collabora.com>]

Hi Andy,

On 6/1/26 4:44 PM, Andy Yan wrote:
> 
> Hello Cristian,
> 
> At 2026-05-25 00:27:27, "Cristian Ciocaltea" <cristian.ciocaltea@collabora.com> wrote:
>> Since commit bec7cbfa7d4f ("drm/rockchip: vop2: Support setting custom
>> background color") the VOP2 display controller allows configuring the
>> background color of each video output port.
>>
>> However, this is currently limited to RGB formats.  When operating in
>> YUV overlay mode, the color must be programmed using YUV format.
>>
>> Add the necessary RGB-to-YCbCr conversion logic, covering all color
>> spaces supported by the display controller: BT601L, BT601F, BT709L and
>> BT2020L.
>>
> 
> 
> Do you currently have a branch that makes dw-hdmi-qp output in YUV mode ?

Yes, please check [1] which is based on a subset of Nicolas' color format
series. 

Note I've also submitted a new revision [2] to handle the conversion from V4L2
colorspace to vop_csc_format (already included in [1]).

Quick test:

# Switch to YUV444
$ modetest -M rockchip -P 34@82:1920x1080+960+540 -w 82:BACKGROUND_COLOR:18446462598732840960 -w 85:'color format':2

# Switch to RGB
$ modetest -M rockchip -P 34@82:1920x1080+960+540 -w 82:BACKGROUND_COLOR:18446462598732840960 -w 85:'color format':1

Regards,
Cristian

[1] https://gitlab.collabora.com/cristicc/linux-next/-/commits/rk3588-yuv420
[2] https://lore.kernel.org/all/20260601-vop2-bg-yuv-v2-0-e5aef1d16fec@collabora.com/