[Intel-gfx] [PATCH] drm/i915/display/vrr: Compute VRR min/max based on highest clock mode for DRRS panel

[Manasi Navare]

In case of a DRRS panel, there is a preferred panel mode and there is
a downclock mode with lower pixel clock. But the Vtotal for both remains
the same. This means even in downclocking mode the VRR Vtotal min/max
should remain the same.
So in this case always use the highest clock mode to compute VRR
parameters.

Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Jani Nikula <jani.nikula at intel.com>
Signed-off-by: Manasi Navare <navaremanasi at chromium.org>
---
 drivers/gpu/drm/i915/display/intel_dp.c  | 4 ++--
 drivers/gpu/drm/i915/display/intel_dp.h  | 2 ++
 drivers/gpu/drm/i915/display/intel_vrr.c | 7 ++++---
 3 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 7067ee3a4bd3..c572a018ce57 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1509,8 +1509,8 @@ static bool has_seamless_m_n(struct intel_connector *connector)
 		intel_panel_drrs_type(connector) == DRRS_TYPE_SEAMLESS;
 }
 
-static int intel_dp_mode_clock(const struct intel_crtc_state *crtc_state,
-			       const struct drm_connector_state *conn_state)
+int intel_dp_mode_clock(const struct intel_crtc_state *crtc_state,
+			const struct drm_connector_state *conn_state)
 {
 	struct intel_connector *connector = to_intel_connector(conn_state->connector);
 	const struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h
index 788a577ebe16..3c9866356359 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.h
+++ b/drivers/gpu/drm/i915/display/intel_dp.h
@@ -119,6 +119,8 @@ u8 intel_dp_dsc_get_slice_count(struct intel_dp *intel_dp,
 				bool bigjoiner);
 bool intel_dp_need_bigjoiner(struct intel_dp *intel_dp,
 			     int hdisplay, int clock);
+int intel_dp_mode_clock(const struct intel_crtc_state *crtc_state,
+			const struct drm_connector_state *conn_state);
 
 static inline unsigned int intel_dp_unused_lane_mask(int lane_count)
 {
diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c
index 88e4759b538b..18a4e0e4e696 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -8,6 +8,7 @@
 #include "i915_reg.h"
 #include "intel_de.h"
 #include "intel_display_types.h"
+#include "intel_dp.h"
 #include "intel_vrr.h"
 
 bool intel_vrr_is_capable(struct intel_connector *connector)
@@ -106,7 +107,7 @@ intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
 		to_intel_connector(conn_state->connector);
 	struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
 	const struct drm_display_info *info = &connector->base.display_info;
-	int vmin, vmax;
+	int vmin, vmax, clock = intel_dp_mode_clock(crtc_state, conn_state);
 
 	if (!intel_vrr_is_capable(connector))
 		return;
@@ -114,9 +115,9 @@ intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
 	if (adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE)
 		return;
 
-	vmin = DIV_ROUND_UP(adjusted_mode->crtc_clock * 1000,
+	vmin = DIV_ROUND_UP(clock * 1000,
 			    adjusted_mode->crtc_htotal * info->monitor_range.max_vfreq);
-	vmax = adjusted_mode->crtc_clock * 1000 /
+	vmax = clock * 1000 /
 		(adjusted_mode->crtc_htotal * info->monitor_range.min_vfreq);
 
 	vmin = max_t(int, vmin, adjusted_mode->crtc_vtotal);
-- 
2.42.0.rc1.204.g551eb34607-goog