> -----Original Message-----
> From: Ville Syrjala <ville.syrj...@linux.intel.com>
> Sent: Tuesday, March 22, 2022 5:30 PM
> To: intel-gfx@lists.freedesktop.org
> Cc: Nautiyal, Ankit K <ankit.k.nauti...@intel.com>; Shankar, Uma
> <uma.shan...@intel.com>
> Subject: [PATCH v2 12/12] drm/i915/dp: Disable DFP RGB->YCbCr conversion for
> now
>
> From: Ville Syrjälä <ville.syrj...@linux.intel.com>
>
> We lack sufficient state tracking to figure out whether we want the DFP to
> perform
> the RGB->YCbCr conversion for us or not. So currently we are blindly just
> enabling
> that all the time when supported by the DFP. That is nonsense. So until we
> imporve
> our state tracking for this just disable the feature.
>
> Cc: Ankit Nautiyal <ankit.k.nauti...@intel.com>
> Cc: Uma Shankar <uma.shan...@intel.com>
> Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_dp.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
> b/drivers/gpu/drm/i915/display/intel_dp.c
> index d3d458b3267d..a57581198a47 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -1180,6 +1180,7 @@ static bool intel_dp_supports_dsc(struct intel_dp
> *intel_dp, static bool intel_dp_is_ycbcr420(struct intel_dp *intel_dp,
> const struct intel_crtc_state *crtc_state) {
> + /* FIXME see intel_dp_update_420() regarding rgb_to_ycbcr */
> return crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420
> ||
> (crtc_state->output_format ==
> INTEL_OUTPUT_FORMAT_YCBCR444 &&
> intel_dp->dfp.ycbcr_444_to_420);
> @@ -2574,6 +2575,7 @@ void intel_dp_configure_protocol_converter(struct
> intel_dp *intel_dp,
> "Failed to %s protocol converter YCbCr 4:2:0
> conversion
> mode\n",
> str_enable_disable(intel_dp->dfp.ycbcr_444_to_420));
>
> + /* FIXME see intel_dp_update_420() regarding rgb_to_ycbcr */
> tmp = intel_dp->dfp.rgb_to_ycbcr ?
> DP_CONVERSION_BT709_RGB_YCBCR_ENABLE : 0;
>
> @@ -4430,6 +4432,14 @@ intel_dp_update_420(struct intel_dp *intel_dp)
> rgb_to_ycbcr = drm_dp_downstream_rgb_to_ycbcr_conversion(intel_dp-
> >dpcd,
> intel_dp-
> >downstream_ports,
>
> DP_DS_HDMI_BT709_RGB_YCBCR_CONV);
> + /*
> + * FIXME need to actually track whether we're really
> + * going to be doing the RGB->YCbCr connversion or not.
> + * We can't tell by simply looking at intel_dp->dfp.rgb_to_ycbcr.
> + * Readout is going to annoying due to having to read that
> + * state from external hardware that may vanish at any time :(
> + */
> + rgb_to_ycbcr = false;
I think this will break 8k yuv pcon case as of now.
@Nautiyal, Ankit K Can we get that fixed. We will need 8k YUV from source due to
bandwidth constraints.
Rest of the series all looks nice and good.
Regards,
Uma Shankar
> if (DISPLAY_VER(i915) >= 11) {
> /* Let PCON convert from RGB->YCbCr if possible */
> --
> 2.34.1
