[PATCH 12/16] drm/i915/dp: Modify compressed bpp limitations for ultrajoiner

[Ankit Nautiyal]

Add compressed bpp limitations for ultrajoiner.

v2: Fix the case for 1 pipe. (Ankit)

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c | 27 +++++++++++++++++++------
 1 file changed, 21 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index e4b6594d870e..b359d2e808aa 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -865,24 +865,39 @@ u32 get_max_compressed_bpp_with_joiner(struct drm_i915_private *i915,
 				       int num_joined_pipes)
 {
 	u32 max_bpp_small_joiner_ram;
+	u32 max_bpp_bigjoiner;
+	u32 max_bpp;
 
 	/* Small Joiner Check: output bpp <= joiner RAM (bits) / Horiz. width */
 	max_bpp_small_joiner_ram = small_joiner_ram_size_bits(i915) / mode_hdisplay;
 
-	if (num_joined_pipes == 2) {
+	if (num_joined_pipes == 1)
+		return max_bpp_small_joiner_ram;
+
+	if (num_joined_pipes > 1) {
 		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 * ppc * bigjoiner_interface_bits /
+		int num_bigjoiners = num_joined_pipes / 2;
+
+		max_bpp_bigjoiner =
+			i915->display.cdclk.max_cdclk_freq * ppc * bigjoiner_interface_bits *
 			intel_dp_mode_to_fec_clock(mode_clock);
 
-		max_bpp_small_joiner_ram *= 2;
+		max_bpp_bigjoiner *= num_bigjoiners;
+
+		max_bpp_small_joiner_ram *= num_joined_pipes;
+	}
+
+	max_bpp = min(max_bpp_small_joiner_ram, max_bpp_bigjoiner);
+
+	if (num_joined_pipes == 4) {
+		u32 max_bpp_ultrajoiner_ram = (4 * 72 * 512) / mode_hdisplay;
 
-		return min(max_bpp_small_joiner_ram, max_bpp_bigjoiner);
+		max_bpp = min(max_bpp, max_bpp_ultrajoiner_ram);
 	}
 
-	return max_bpp_small_joiner_ram;
+	return max_bpp;
 }
 
 u16 intel_dp_dsc_get_max_compressed_bpp(struct drm_i915_private *i915,
-- 
2.45.2