[Intel-gfx] [RFC 4/7] drm/i915/dp: Allow big joiner modes in intel_dp_mode_valid()

[Maarten Lankhorst]

Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index d5c56ea079a4..b41ff88d3258 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -506,6 +506,7 @@ intel_dp_mode_valid(struct drm_connector *connector,
 	int max_dotclk;
 	u16 dsc_max_output_bpp = 0;
 	u8 dsc_slice_count = 0;
+	bool dsc;
 
 	if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 		return MODE_NO_DBLESCAN;
@@ -553,8 +554,13 @@ intel_dp_mode_valid(struct drm_connector *connector,
 		}
 	}
 
-	if ((mode_rate > max_rate && !(dsc_max_output_bpp && dsc_slice_count)) ||
-	    target_clock > max_dotclk)
+	dsc = dsc_max_output_bpp && dsc_slice_count;
+
+	/* Gen11 has big joiner for handling this */
+	if (dsc && dsc_slice_count >= 2 && INTEL_GEN(dev_priv) >= 11)
+		max_dotclk *= 2;
+
+	if ((mode_rate > max_rate && !dsc) || target_clock > max_dotclk)
 		return MODE_CLOCK_HIGH;
 
 	if (mode->clock < 10000)
-- 
2.20.1