On Wed, 13 Sep 2023, Mitul Golani <mitulkumar.ajitkumar.golani@xxxxxxxxx> wrote:
> From: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
>
> Add helper to get the DSC bits_per_pixel precision for the DP sink.
>
> Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
Maarten, Maxime, Thomas, ack for merging this via drm-intel please?
BR,
Jani.
> ---
> drivers/gpu/drm/display/drm_dp_helper.c | 27 +++++++++++++++++++++++++
> include/drm/display/drm_dp_helper.h | 1 +
> 2 files changed, 28 insertions(+)
>
> diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c
> index 8a1b64c57dfd..5c23d5b8fc50 100644
> --- a/drivers/gpu/drm/display/drm_dp_helper.c
> +++ b/drivers/gpu/drm/display/drm_dp_helper.c
> @@ -2323,6 +2323,33 @@ int drm_dp_read_desc(struct drm_dp_aux *aux, struct drm_dp_desc *desc,
> }
> EXPORT_SYMBOL(drm_dp_read_desc);
>
> +/**
> + * drm_dp_dsc_sink_bpp_incr() - Get bits per pixel increment
> + * @dsc_dpcd: DSC capabilities from DPCD
> + *
> + * Returns the bpp precision supported by the DP sink.
> + */
> +u8 drm_dp_dsc_sink_bpp_incr(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> +{
> + u8 bpp_increment_dpcd = dsc_dpcd[DP_DSC_BITS_PER_PIXEL_INC - DP_DSC_SUPPORT];
> +
> + switch (bpp_increment_dpcd) {
> + case DP_DSC_BITS_PER_PIXEL_1_16:
> + return 16;
> + case DP_DSC_BITS_PER_PIXEL_1_8:
> + return 8;
> + case DP_DSC_BITS_PER_PIXEL_1_4:
> + return 4;
> + case DP_DSC_BITS_PER_PIXEL_1_2:
> + return 2;
> + case DP_DSC_BITS_PER_PIXEL_1_1:
> + return 1;
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(drm_dp_dsc_sink_bpp_incr);
> +
> /**
> * drm_dp_dsc_sink_max_slice_count() - Get the max slice count
> * supported by the DSC sink.
> diff --git a/include/drm/display/drm_dp_helper.h b/include/drm/display/drm_dp_helper.h
> index 3369104e2d25..6968d4d87931 100644
> --- a/include/drm/display/drm_dp_helper.h
> +++ b/include/drm/display/drm_dp_helper.h
> @@ -164,6 +164,7 @@ drm_dp_is_branch(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
> }
>
> /* DP/eDP DSC support */
> +u8 drm_dp_dsc_sink_bpp_incr(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]);
> u8 drm_dp_dsc_sink_max_slice_count(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE],
> bool is_edp);
> u8 drm_dp_dsc_sink_line_buf_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]);
--
Jani Nikula, Intel
