[PATCH v9 01/24] drm/dsc: Modify DRM helper to return complete DSC color depth capabilities

[Manasi Navare <manasi.d.navare@intel.com>]

DSC DPCD color depth register advertises its color depth capabilities
by setting each of the bits that corresponding to a specific color
depth. This patch defines those specific color depths and adds
a helper to return an array of color depth capabilities.

Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/drm_dp_helper.c | 29 +++++++++++++++++++----------
 include/drm/drm_dp_helper.h     |  9 +++++----
 2 files changed, 24 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 6d483487f2b4..286567063960 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -1428,17 +1428,26 @@ u8 drm_dp_dsc_sink_line_buf_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
 }
 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])
+void drm_dp_dsc_sink_color_depth_cap(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE],
+				     u8 *dsc_sink_color_depth_cap)
 {
+	int i, cnt = 0;
 	u8 color_depth = dsc_dpcd[DP_DSC_DEC_COLOR_DEPTH_CAP - DP_DSC_SUPPORT];
 
-	if (color_depth & DP_DSC_12_BPC)
-		return 12;
-	if (color_depth & DP_DSC_10_BPC)
-		return 10;
-	if (color_depth & DP_DSC_8_BPC)
-		return 8;
-
-	return 0;
+	for (i = 1; i <= 3; i++) {
+		if (!(color_depth & BIT(i)))
+			continue;
+		switch (i) {
+		case 1:
+			dsc_sink_color_depth_cap[cnt++] = DP_DSC_8_BPC;
+			break;
+		case 2:
+			dsc_sink_color_depth_cap[cnt++] = DP_DSC_10_BPC;
+			break;
+		case 3:
+			dsc_sink_color_depth_cap[cnt++] = DP_DSC_12_BPC;
+			break;
+		}
+	}
 }
-EXPORT_SYMBOL(drm_dp_dsc_sink_max_color_depth);
+EXPORT_SYMBOL(drm_dp_dsc_sink_color_depth_cap);
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 3314e91f6eb3..ea3233b0a790 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -242,9 +242,9 @@
 # define DP_DSC_YCbCr420_Native             (1 << 4)
 
 #define DP_DSC_DEC_COLOR_DEPTH_CAP          0x06A
-# define DP_DSC_8_BPC                       (1 << 1)
-# define DP_DSC_10_BPC                      (1 << 2)
-# define DP_DSC_12_BPC                      (1 << 3)
+# define DP_DSC_8_BPC                       8
+# define DP_DSC_10_BPC                      10
+# define DP_DSC_12_BPC                      12
 
 #define DP_DSC_PEAK_THROUGHPUT              0x06B
 # define DP_DSC_THROUGHPUT_MODE_0_MASK      (0xf << 0)
@@ -1123,7 +1123,8 @@ drm_dp_is_branch(const u8 dpcd[DP_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]);
-u8 drm_dp_dsc_sink_max_color_depth(const u8 dsc_dpc[DP_DSC_RECEIVER_CAP_SIZE]);
+void drm_dp_dsc_sink_color_depth_cap(const u8 dsc_dpc[DP_DSC_RECEIVER_CAP_SIZE],
+				     u8 *dsc_sink_color_depth_cap);
 
 static inline bool
 drm_dp_sink_supports_dsc(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
-- 
2.19.1

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