[Intel-gfx] [PATCH] drm/dp/dsc: Add Support for all BPCs supported by TGL

[Anusha Srivatsa]

DSC engine on ICL supports only 8 and 10 BPC as the input
BPC. But DSC engine in TGL supports 8, 10 and 12 BPC.
Add 12 BPC support for DSC while calculating compression
configuration.

Cc: Manasi Navare <manasi.d.navare at intel.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 0bdb7ecc5a81..cd089643c80d 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -71,6 +71,7 @@
 #define DP_DSC_MAX_SMALL_JOINER_RAM_BUFFER	61440
 #define DP_DSC_MIN_SUPPORTED_BPC		8
 #define DP_DSC_MAX_SUPPORTED_BPC		10
+#define TGL_DP_DSC_MAX_SUPPORTED_BPC		12
 
 /* DP DSC throughput values used for slice count calculations KPixels/s */
 #define DP_DSC_PEAK_PIXEL_RATE			2720000
@@ -1911,8 +1912,12 @@ static int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
 	if (!intel_dp_supports_dsc(intel_dp, pipe_config))
 		return -EINVAL;
 
-	dsc_max_bpc = min_t(u8, DP_DSC_MAX_SUPPORTED_BPC,
-			    conn_state->max_requested_bpc);
+	if (INTEL_GEN(dev_priv) > 11)
+		dsc_max_bpc = min_t(u8, TGL_DP_DSC_MAX_SUPPORTED_BPC,
+				    conn_state->max_requested_bpc);
+	else
+		dsc_max_bpc = min_t(u8, DP_DSC_MAX_SUPPORTED_BPC,
+				    conn_state->max_requested_bpc);
 
 	pipe_bpp = intel_dp_dsc_compute_bpp(intel_dp, dsc_max_bpc);
 	if (pipe_bpp < DP_DSC_MIN_SUPPORTED_BPC * 3) {
-- 
2.21.0