[PATCH v4 07/30] drm/dp: Add DP_HBLANK_EXPANSION_CAPABLE and DSC_PASSTHROUGH_EN DPCD flags

[Lyude Paul]

Reviewed-by: Lyude Paul <lyude at redhat.com>

On Mon, 2023-10-30 at 17:58 +0200, Imre Deak wrote:
> Add the DPCD flag to enable DSC passthrough in a last branch device,
> used in a follow-up i915 patch.
> 
> Also add a flag to detect HBLANK expansion support in a branch device,
> used by a workaround in a follow-up i915 patch.
> 
> Cc: Lyude Paul <lyude at redhat.com>
> Cc: dri-devel at lists.freedesktop.org
> Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
> Signed-off-by: Imre Deak <imre.deak at intel.com>
> ---
>  include/drm/display/drm_dp.h | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/include/drm/display/drm_dp.h b/include/drm/display/drm_dp.h
> index e69cece404b3c..763d45a612f35 100644
> --- a/include/drm/display/drm_dp.h
> +++ b/include/drm/display/drm_dp.h
> @@ -148,6 +148,7 @@
>  #define DP_RECEIVE_PORT_0_CAP_0		    0x008
>  # define DP_LOCAL_EDID_PRESENT		    (1 << 1)
>  # define DP_ASSOCIATED_TO_PRECEDING_PORT    (1 << 2)
> +# define DP_HBLANK_EXPANSION_CAPABLE        (1 << 3)
>  
>  #define DP_RECEIVE_PORT_0_BUFFER_SIZE	    0x009
>  
> @@ -699,6 +700,7 @@
>  
>  #define DP_DSC_ENABLE                       0x160   /* DP 1.4 */
>  # define DP_DECOMPRESSION_EN                (1 << 0)
> +# define DP_DSC_PASSTHROUGH_EN		    (1 << 1)
>  #define DP_DSC_CONFIGURATION				0x161	/* DP 2.0 */
>  
>  #define DP_PSR_EN_CFG				0x170   /* XXX 1.2? */

-- 
Cheers,
 Lyude Paul (she/her)
 Software Engineer at Red Hat