[Intel-gfx] [PATCH 05/20] drm/i915/dp: Update Bigjoiner interface bits for computing compressed bpp

[Ankit Nautiyal]

In Bigjoiner check for DSC, bigjoiner interface bits for DP for
DISPLAY > 13 is 36 (Bspec: 49259).

v2: Corrected Display ver to 13.

v3: Follow convention for conditional statement. (Ville)

v4: Fix check for display ver. (Ville)

v5: Added note for 2 PPC. (Stan)

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 35608b9de573..fc08fc85d665 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -802,8 +802,11 @@ u16 intel_dp_dsc_get_max_compressed_bpp(struct drm_i915_private *i915,
 	bits_per_pixel = min(bits_per_pixel, max_bpp_small_joiner_ram);
 
 	if (bigjoiner) {
+		int bigjoiner_interface_bits = DISPLAY_VER(i915) >= 14 ? 36 : 24;
+		/* With bigjoiner multiple dsc engines are used in parallel so PPC is 2 */
+		int ppc = 2;
 		u32 max_bpp_bigjoiner =
-			i915->display.cdclk.max_cdclk_freq * 48 /
+			i915->display.cdclk.max_cdclk_freq * ppc * bigjoiner_interface_bits /
 			intel_dp_mode_to_fec_clock(mode_clock);
 
 		bits_per_pixel = min(bits_per_pixel, max_bpp_bigjoiner);
-- 
2.40.1