Re: [PATCH v6 13/15] drm/rockchip: dw_hdmi_qp: Support 10-bit YUV422 output format

[Daniel Stone]

On Thu, 5 Nov 2026 at 01:01, Cristian Ciocaltea
<cristian.ciocaltea@xxxxxxxxxxxxx> wrote:
> Rockchip DW HDMI QP encoder supports YUV 4:2:2 output through
> ROCKCHIP_OUT_MODE_YUV422, but was limited to 8-bit depth via
> MEDIA_BUS_FMT_UYVY8_1X16.  Add support for its 10-bit counterpart
> MEDIA_BUS_FMT_UYVY10_1X20, which carries two 10-bit components per clock
> cycle on a 20-bit wide bus.
>
> The HDMI PHY scales its PLL output by 8/bpc to undo the deep color
> packing, such that it matches the DCLK rate expected by VOP2.  However,
> YUV 4:2:2 is never deep color packed, as it always transmits two 12-bit
> components per pixel, regardless of the color depth.  From a clock-rate
> perspective this is equivalent to three 8-bit RGB components, so
> configure the HDMI PHY with 8 bpc when YUV 4:2:2 is in use to keep its
> output clock aligned with the TMDS character rate.

Reviewed-by: Daniel Stone <daniels@xxxxxxxxxxxxx>