[PATCH v7 03/13] drm/i915/display_wa: Add support for Wa_14014191401

[Suraj Kandpal <suraj.kandpal@intel.com>]

The DG2 transcoder timing generator DDA only supports a Link M/N ratio
of up to 4. The Link M/N ratio limit uses a bare platform check for it.

Add Wa_14014191401 for DG2 and use it for the limit instead.

Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>
---
 drivers/gpu/drm/i915/display/intel_display_wa.c | 2 ++
 drivers/gpu/drm/i915/display/intel_display_wa.h | 1 +
 drivers/gpu/drm/i915/display/intel_dp.c         | 3 ++-
 3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_wa.c b/drivers/gpu/drm/i915/display/intel_display_wa.c
index 2e3ff4861ef4..91395076e903 100644
--- a/drivers/gpu/drm/i915/display/intel_display_wa.c
+++ b/drivers/gpu/drm/i915/display/intel_display_wa.c
@@ -94,6 +94,8 @@ bool __intel_display_wa(struct intel_display *display, enum intel_display_wa wa,
 			IS_DISPLAY_STEP(display, STEP_A0, STEP_A2);
 	case INTEL_DISPLAY_WA_14014143976:
 		return IS_DISPLAY_STEP(display, STEP_E0, STEP_FOREVER);
+	case INTEL_DISPLAY_WA_14014191401:
+		return display->platform.dg2;
 	case INTEL_DISPLAY_WA_14016740474:
 		return IS_DISPLAY_VERx100_STEP(display, 1400, STEP_A0, STEP_C0);
 	case INTEL_DISPLAY_WA_14020863754:
diff --git a/drivers/gpu/drm/i915/display/intel_display_wa.h b/drivers/gpu/drm/i915/display/intel_display_wa.h
index b707147a7587..f41e58d1d6e7 100644
--- a/drivers/gpu/drm/i915/display/intel_display_wa.h
+++ b/drivers/gpu/drm/i915/display/intel_display_wa.h
@@ -31,6 +31,7 @@ enum intel_display_wa {
 	INTEL_DISPLAY_WA_14011508470,
 	INTEL_DISPLAY_WA_14011765242,
 	INTEL_DISPLAY_WA_14014143976,
+	INTEL_DISPLAY_WA_14014191401,
 	INTEL_DISPLAY_WA_14016740474,
 	INTEL_DISPLAY_WA_14020863754,
 	INTEL_DISPLAY_WA_14025769978,
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 7ceb7c02b597..f3a79ae49b18 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -70,6 +70,7 @@
 #include "intel_display_regs.h"
 #include "intel_display_rpm.h"
 #include "intel_display_types.h"
+#include "intel_display_wa.h"
 #include "intel_dp.h"
 #include "intel_dp_aux.h"
 #include "intel_dp_hdcp.h"
@@ -1271,7 +1272,7 @@ bool intel_dp_has_dsc(const struct intel_connector *connector)
 static int
 intel_dp_get_max_m_n_ratio(struct intel_display *display)
 {
-	if (display->platform.dg2)
+	if (intel_display_wa(display, INTEL_DISPLAY_WA_14014191401))
 		return 4;
 
 	return 10;
-- 
2.34.1