>-----Original Message-----
>From: Navare, Manasi D
>Sent: Tuesday, July 31, 2018 2:07 PM
>To: intel-gfx@xxxxxxxxxxxxxxxxxxxxx
>Cc: Navare, Manasi D <manasi.d.navare@xxxxxxxxx>; Singh, Gaurav K
><gaurav.k.singh@xxxxxxxxx>; dri-devel@xxxxxxxxxxxxxxxxxxxxx; Jani Nikula
><jani.nikula@xxxxxxxxxxxxxxx>; Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx>;
>Srivatsa, Anusha <anusha.srivatsa@xxxxxxxxx>
>Subject: [PATCH v2 03/23] drm/dp: DRM DP helper/macros to get DP sink DSC
>parameters
>
>This patch adds inline functions and helpers for obtaining DP sink's supported DSC
>parameters like DSC sink support, eDP compressed BPP supported, maximum slice
>count supported by the sink devices, DSC line buffer bit depth supported on DP
>sink, DSC sink maximum color depth by parsing corresponding DPCD registers.
>
>v4:
>* Add helper to give line buf bit depth (Manasi)
>v3:
>* Use SLICE_CAP_2 for DP (Anusha)
>v2:
>* Add DSC sink support macro (Jani N)
>
>Cc: Gaurav K Singh <gaurav.k.singh@xxxxxxxxx>
>Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
>Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
>Cc: Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx>
>Cc: Anusha Srivatsa <anusha.srivatsa@xxxxxxxxx>
>Signed-off-by: Manasi Navare <manasi.d.navare@xxxxxxxxx>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@xxxxxxxxx>
>---
> drivers/gpu/drm/drm_dp_helper.c | 89
>+++++++++++++++++++++++++++++++++++++++++
> include/drm/drm_dp_helper.h | 30 ++++++++++++++
> 2 files changed, 119 insertions(+)
>
>diff --git a/drivers/gpu/drm/drm_dp_helper.c
>b/drivers/gpu/drm/drm_dp_helper.c index 0cccbcb..7dc61d1 100644
>--- a/drivers/gpu/drm/drm_dp_helper.c
>+++ b/drivers/gpu/drm/drm_dp_helper.c
>@@ -1336,3 +1336,92 @@ int drm_dp_read_desc(struct drm_dp_aux *aux,
>struct drm_dp_desc *desc,
> return 0;
> }
> EXPORT_SYMBOL(drm_dp_read_desc);
>+
>+/**
>+ * DRM DP Helpers for DSC
>+ */
>+u8 drm_dp_dsc_sink_max_slice_count(const u8
>dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE],
>+ bool is_edp)
>+{
>+ u8 slice_cap1 = dsc_dpcd[DP_DSC_SLICE_CAP_1 - DP_DSC_SUPPORT];
>+
>+ if (is_edp) {
>+ /* For eDP, register DSC_SLICE_CAPABILITIES_1
NIT : the actual register is DSC_SLICE_CAP_1
gives slice count
>*/
>+ if (slice_cap1 & DP_DSC_4_PER_DP_DSC_SINK)
>+ return 4;
>+ if (slice_cap1 & DP_DSC_2_PER_DP_DSC_SINK)
>+ return 2;
>+ if (slice_cap1 & DP_DSC_1_PER_DP_DSC_SINK)
>+ return 1;
>+ } else {
>+ /* For DP, use values from DSC_SLICE_CAP_1 and
>DSC_SLICE_CAP2 */
^^^ DSC_SLICE_CAP_2
>+ u8 slice_cap2 = dsc_dpcd[DP_DSC_SLICE_CAP_2 -
>DP_DSC_SUPPORT];
>+
>+ if (slice_cap2 & DP_DSC_24_PER_DP_DSC_SINK)
>+ return 24;
>+ if (slice_cap2 & DP_DSC_20_PER_DP_DSC_SINK)
>+ return 20;
>+ if (slice_cap2 & DP_DSC_16_PER_DP_DSC_SINK)
>+ return 16;
>+ if (slice_cap1 & DP_DSC_12_PER_DP_DSC_SINK)
>+ return 12;
>+ if (slice_cap1 & DP_DSC_10_PER_DP_DSC_SINK)
>+ return 10;
>+ if (slice_cap1 & DP_DSC_8_PER_DP_DSC_SINK)
>+ return 8;
>+ if (slice_cap1 & DP_DSC_6_PER_DP_DSC_SINK)
>+ return 6;
>+ if (slice_cap1 & DP_DSC_4_PER_DP_DSC_SINK)
>+ return 4;
>+ if (slice_cap1 & DP_DSC_2_PER_DP_DSC_SINK)
>+ return 2;
>+ if (slice_cap1 & DP_DSC_1_PER_DP_DSC_SINK)
>+ return 1;
>+ }
>+
>+ return 0;
>+}
>+EXPORT_SYMBOL(drm_dp_dsc_sink_max_slice_count);
>+
>+u8 drm_dp_dsc_sink_line_buf_depth(const u8
>+dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
>+{
>+ u8 line_buf_depth = dsc_dpcd[DP_DSC_LINE_BUF_BIT_DEPTH -
>+DP_DSC_SUPPORT];
>+
>+ switch (line_buf_depth & DP_DSC_LINE_BUF_BIT_DEPTH_MASK) {
>+ case DP_DSC_LINE_BUF_BIT_DEPTH_9:
>+ return 9;
>+ case DP_DSC_LINE_BUF_BIT_DEPTH_10:
>+ return 10;
>+ case DP_DSC_LINE_BUF_BIT_DEPTH_11:
>+ return 11;
>+ case DP_DSC_LINE_BUF_BIT_DEPTH_12:
>+ return 12;
>+ case DP_DSC_LINE_BUF_BIT_DEPTH_13:
>+ return 13;
>+ case DP_DSC_LINE_BUF_BIT_DEPTH_14:
>+ return 14;
>+ case DP_DSC_LINE_BUF_BIT_DEPTH_15:
>+ return 15;
>+ case DP_DSC_LINE_BUF_BIT_DEPTH_16:
>+ return 16;
>+ case DP_DSC_LINE_BUF_BIT_DEPTH_8:
>+ return 8;
>+ }
>+
>+ return 0;
>+}
>+EXPORT_SYMBOL(drm_dp_dsc_sink_line_buf_depth);
>+
>+u8 drm_dp_dsc_sink_max_color_depth(const u8
>+dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
>+{
>+ switch (dsc_dpcd[DP_DSC_DEC_COLOR_DEPTH_CAP -
>DP_DSC_SUPPORT]) {
>+ case DP_DSC_12_BPC:
>+ return 12;
>+ case DP_DSC_10_BPC:
>+ return 10;
>+ case DP_DSC_8_BPC:
>+ return 8;
>+ }
>+ return 0;
>+}
>+EXPORT_SYMBOL(drm_dp_dsc_sink_max_color_depth);
>diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index
>eb0d86c..8c1dbca 100644
>--- a/include/drm/drm_dp_helper.h
>+++ b/include/drm/drm_dp_helper.h
>@@ -1064,6 +1064,36 @@ drm_dp_is_branch(const u8
>dpcd[DP_RECEIVER_CAP_SIZE])
> return dpcd[DP_DOWNSTREAMPORT_PRESENT] &
>DP_DWN_STRM_PORT_PRESENT; }
>
>+/* DP/eDP DSC support */
>+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]);
>+u8 drm_dp_dsc_sink_max_color_depth(const u8
>+dsc_dpc[DP_DSC_RECEIVER_CAP_SIZE]);
>+
>+static inline bool
>+drm_dp_sink_supports_dsc(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
>+{
>+ return dsc_dpcd[DP_DSC_SUPPORT - DP_DSC_SUPPORT] &
>+ DP_DSC_DECOMPRESSION_IS_SUPPORTED;
>+}
>+
>+static inline u16
>+drm_edp_dsc_sink_output_bpp(const u8
>+dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
>+{
>+ return dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_LOW -
>DP_DSC_SUPPORT] |
>+ (dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_HI -
>DP_DSC_SUPPORT] &
>+ DP_DSC_MAX_BITS_PER_PIXEL_HI_MASK <<
>+ DP_DSC_MAX_BITS_PER_PIXEL_HI_SHIFT);
>+}
>+
>+static inline u32
>+drm_dp_dsc_sink_max_slice_width(const u8
>+dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
>+{
>+ /* Max Slicewidth = Number of Pixels * 320 */
>+ return dsc_dpcd[DP_DSC_MAX_SLICE_WIDTH - DP_DSC_SUPPORT] *
>+ DP_DSC_SLICE_WIDTH_MULTIPLIER;
>+}
>+
> /*
> * DisplayPort AUX channel
> */
>--
>2.7.4
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