drm/i915/vrr: Tell intel_crtc_update_active_timings() about VRR explicitly

In order to move VRR enable/disable to a place where it's also
applicable to fastsets we need to be prepared to configure
the pipe into non-VRR mode initially, and then later switch
to VRR mode. To that end allow the active timings to be configured
in non-VRR mode temporarily even when the crtc_state says we're
going to be using VRR.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230320203352.19515-5-ville.syrjala@linux.intel.comReviewed-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com>

drivers/gpu/drm/i915/display/intel_crtc.c

@@ -692,7 +692,8 @@ void intel_pipe_update_end(struct intel_crtc_state *new_crtc_state)
 	 * FIXME Should be synchronized with the start of vblank somehow...
 	 */
 	if (new_crtc_state->seamless_m_n && intel_crtc_needs_fastset(new_crtc_state))
-		intel_crtc_update_active_timings(new_crtc_state);
+		intel_crtc_update_active_timings(new_crtc_state,
+						 new_crtc_state->vrr.enable);
 
 	local_irq_enable();
 

drivers/gpu/drm/i915/display/intel_display.c

@@ -6910,7 +6910,8 @@ static void intel_enable_crtc(struct intel_atomic_state *state,
 	if (!intel_crtc_needs_modeset(new_crtc_state))
 		return;
 
-	intel_crtc_update_active_timings(new_crtc_state);
+	intel_crtc_update_active_timings(new_crtc_state,
+					 new_crtc_state->vrr.enable);
 
 	dev_priv->display.funcs.display->crtc_enable(state, crtc);
 

drivers/gpu/drm/i915/display/intel_modeset_setup.c

@@ -559,7 +559,8 @@ static void intel_modeset_readout_hw_state(struct drm_i915_private *i915)
 			 */
 			crtc_state->inherited = true;
 
-			intel_crtc_update_active_timings(crtc_state);
+			intel_crtc_update_active_timings(crtc_state,
+							 crtc_state->vrr.enable);
 
 			intel_crtc_copy_hw_to_uapi_state(crtc_state);
 		}

drivers/gpu/drm/i915/display/intel_vblank.c

@@ -488,21 +488,27 @@ static int intel_crtc_scanline_offset(const struct intel_crtc_state *crtc_state)
 	}
 }
 
-void intel_crtc_update_active_timings(const struct intel_crtc_state *crtc_state)
+void intel_crtc_update_active_timings(const struct intel_crtc_state *crtc_state,
+				      bool vrr_enable)
 {
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
 	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
+	u8 mode_flags = crtc_state->mode_flags;
 	struct drm_display_mode adjusted_mode;
 	int vmax_vblank_start = 0;
 	unsigned long irqflags;
 
 	drm_mode_init(&adjusted_mode, &crtc_state->hw.adjusted_mode);
 
-	if (crtc_state->vrr.enable) {
+	if (vrr_enable) {
+		drm_WARN_ON(&i915->drm, (mode_flags & I915_MODE_FLAG_VRR) == 0);
+
 		adjusted_mode.crtc_vtotal = crtc_state->vrr.vmax;
 		adjusted_mode.crtc_vblank_end = crtc_state->vrr.vmax;
 		adjusted_mode.crtc_vblank_start = intel_vrr_vmin_vblank_start(crtc_state);
 		vmax_vblank_start = intel_vrr_vmax_vblank_start(crtc_state);
+	} else {
+		mode_flags &= ~I915_MODE_FLAG_VRR;
 	}
 
 	/*
@@ -524,7 +530,7 @@ void intel_crtc_update_active_timings(const struct intel_crtc_state *crtc_state)
 
 	crtc->vmax_vblank_start = vmax_vblank_start;
 
-	crtc->mode_flags = crtc_state->mode_flags;
+	crtc->mode_flags = mode_flags;
 
 	crtc->scanline_offset = intel_crtc_scanline_offset(crtc_state);
 

drivers/gpu/drm/i915/display/intel_vblank.h

@@ -20,6 +20,7 @@ bool intel_crtc_get_vblank_timestamp(struct drm_crtc *crtc, int *max_error,
 int intel_get_crtc_scanline(struct intel_crtc *crtc);
 void intel_wait_for_pipe_scanline_stopped(struct intel_crtc *crtc);
 void intel_wait_for_pipe_scanline_moving(struct intel_crtc *crtc);
-void intel_crtc_update_active_timings(const struct intel_crtc_state *crtc_state);
+void intel_crtc_update_active_timings(const struct intel_crtc_state *crtc_state,
+				      bool vrr_enable);
 
 #endif /* __INTEL_VBLANK_H__ */