[PATCH 13/17] 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)
v3: Refactor existing helper separately and add only ultrajoiner
limitation. (Ville)

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index e7fe100ef8db..3d4d8e58380a 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -896,6 +896,11 @@ static u32 small_joiner_ram_max_bpp(struct intel_display *display, u32 mode_hdis
 	return max_bpp;
 }
 
+static u32 ultrajoiner_ram_max_bpp(struct intel_display *display, u32 mode_hdisplay)
+{
+	return (4 * 72 * 512) / mode_hdisplay;
+}
+
 static
 u32 get_max_compressed_bpp_with_joiner(struct drm_i915_private *i915,
 				       u32 mode_clock, u32 mode_hdisplay,
@@ -907,6 +912,9 @@ u32 get_max_compressed_bpp_with_joiner(struct drm_i915_private *i915,
 	max_bpp = small_joiner_ram_max_bpp(display, mode_hdisplay, num_joined_pipes);
 	max_bpp = min(max_bpp, bigjoiner_bw_max_bpp(display, mode_clock, num_joined_pipes));
 
+	if (num_joined_pipes == 4)
+		max_bpp = min(max_bpp, ultrajoiner_ram_max_bpp(display, mode_hdisplay));
+
 	return max_bpp;
 }
 
-- 
2.45.2