[PATCH v1 3/5] drm: bridge: dw_hdmi: Enable GCP only for Deep Color
Neil Armstrong
narmstrong at baylibre.com
Wed Apr 6 09:20:16 UTC 2022
On 06/04/2022 10:48, Sandor.yu at nxp.com wrote:
> From: Sandor Yu <Sandor.yu at nxp.com>
>
> HDMI1.4b specification section 6.5.3:
> Source shall only send GCPs with non-zero CD to sinks
> that indicate support for Deep Color.
>
> DW HDMI GPC default enabled, clear gpc_auto bit for bpp 24.
>
> Signed-off-by: Sandor Yu <Sandor.yu at nxp.com>
> ---
> drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index b11577de4836..c7b11582529e 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -1160,6 +1160,14 @@ static void hdmi_video_packetize(struct dw_hdmi *hdmi)
> HDMI_VP_PR_CD_DESIRED_PR_FACTOR_MASK);
> hdmi_writeb(hdmi, val, HDMI_VP_PR_CD);
>
> + val = hdmi_readb(hdmi, HDMI_FC_DATAUTO3);
> + if (color_depth == 4)
> + /* disable Auto GCP when bpp 24 */
> + val &= ~0x4;
> + else
> + val |= 0x4;
> + hdmi_writeb(hdmi, val, HDMI_FC_DATAUTO3);
> +
> hdmi_modb(hdmi, HDMI_VP_STUFF_PR_STUFFING_STUFFING_MODE,
> HDMI_VP_STUFF_PR_STUFFING_MASK, HDMI_VP_STUFF);
>
Do you handle the case when color_depth == 0 when output is YUV422 ?
Neil
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