5 files changed, 95 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 6051a5cabfef..8cee2b1c8d78 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -58,6 +58,7 @@
 #include "display/intel_sdvo.h"
 #include "display/intel_tv.h"
 #include "display/intel_vdsc.h"
+#include "display/intel_vrr.h"
 
 #include "gem/i915_gem_object.h"
 
@@ -11319,6 +11320,12 @@ intel_pipe_config_compare(const struct intel_crtc_state *current_config,
 
 	PIPE_CONF_CHECK_I(mst_master_transcoder);
 
+	PIPE_CONF_CHECK_BOOL(vrr.enable);
+	PIPE_CONF_CHECK_I(vrr.vmin);
+	PIPE_CONF_CHECK_I(vrr.vmax);
+	PIPE_CONF_CHECK_I(vrr.flipline);
+	PIPE_CONF_CHECK_I(vrr.pipeline_full);
+
 #undef PIPE_CONF_CHECK_X
 #undef PIPE_CONF_CHECK_I
 #undef PIPE_CONF_CHECK_BOOL
@@ -12476,6 +12483,8 @@ static int intel_atomic_check(struct drm_device *dev,
 			new_crtc_state->uapi.mode_changed = true;
 	}
 
+	intel_vrr_check_modeset(state);
+
 	ret = drm_atomic_helper_check_modeset(dev, &state->base);
 	if (ret)
 		goto fail;
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 927a8aeae324..b5bac4c81de1 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1151,6 +1151,13 @@ struct intel_crtc_state {
 	struct intel_dsb *dsb;
 
 	u32 psr2_man_track_ctl;
+
+	/* Variable Refresh Rate state */
+	struct {
+		bool enable;
+		u8 pipeline_full;
+		u16 flipline, vmin, vmax;
+	} vrr;
 };
 
 enum intel_pipe_crc_source {
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index e6efa0fc31ea..6c1aaaf587c2 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1827,6 +1827,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
 	if (!HAS_DDI(dev_priv))
 		intel_dp_set_clock(encoder, pipe_config);
 
+	intel_vrr_compute_config(pipe_config, conn_state);
 	intel_psr_compute_config(intel_dp, pipe_config);
 	intel_dp_drrs_compute_config(intel_dp, pipe_config, output_bpp,
 				     constant_n);
diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c
index b0503edbfdfe..346ea3c16cc8 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -29,3 +29,73 @@ bool intel_vrr_is_capable(struct drm_connector *connector)
 		drm_dp_sink_can_do_video_without_timing_msa(intel_dp->dpcd) &&
 		info->monitor_range.max_vfreq - info->monitor_range.min_vfreq > 10;
 }
+
+void
+intel_vrr_check_modeset(struct intel_atomic_state *state)
+{
+	int i;
+	struct intel_crtc_state *old_crtc_state, *new_crtc_state;
+	struct intel_crtc *crtc;
+
+	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
+					    new_crtc_state, i) {
+		if (new_crtc_state->uapi.vrr_enabled !=
+		    old_crtc_state->uapi.vrr_enabled)
+			new_crtc_state->uapi.mode_changed = true;
+	}
+}
+
+void
+intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
+			 struct drm_connector_state *conn_state)
+{
+	struct intel_connector *connector =
+		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;
+
+	if (!intel_vrr_is_capable(&connector->base))
+		return;
+
+	if (adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE)
+		return;
+
+	if (!crtc_state->uapi.vrr_enabled)
+		return;
+
+	vmin = DIV_ROUND_UP(adjusted_mode->crtc_clock * 1000,
+			    adjusted_mode->crtc_htotal * info->monitor_range.max_vfreq);
+	vmax = adjusted_mode->crtc_clock * 1000 /
+		(adjusted_mode->crtc_htotal * info->monitor_range.min_vfreq);
+
+	vmin = max_t(int, vmin, adjusted_mode->crtc_vtotal);
+	vmax = max_t(int, vmax, adjusted_mode->crtc_vtotal);
+
+	if (vmin >= vmax)
+		return;
+
+	/*
+	 * flipline determines the min vblank length the hardware will
+	 * generate, and flipline>=vmin+1, hence we reduce vmin by one
+	 * to make sure we can get the actual min vblank length.
+	 */
+	crtc_state->vrr.vmin = vmin - 1;
+	crtc_state->vrr.vmax = vmax;
+	crtc_state->vrr.enable = true;
+
+	crtc_state->vrr.flipline = crtc_state->vrr.vmin + 1;
+
+	/*
+	 * FIXME: s/4/framestart_delay+1/ to get consistent
+	 * earliest/latest points for register latching regardless
+	 * of the framestart_delay used?
+	 *
+	 * FIXME: this really needs the extra scanline to provide consistent
+	 * behaviour for all framestart_delay values. Otherwise with
+	 * framestart_delay==3 we will end up extending the min vblank by
+	 * one extra line.
+	 */
+	crtc_state->vrr.pipeline_full =
+		min(255, crtc_state->vrr.vmin - adjusted_mode->crtc_vdisplay - 4 - 1);
+}
diff --git a/drivers/gpu/drm/i915/display/intel_vrr.h b/drivers/gpu/drm/i915/display/intel_vrr.h
index 8102de494e2a..992b9c58c0d6 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.h
+++ b/drivers/gpu/drm/i915/display/intel_vrr.h
@@ -9,7 +9,15 @@
 #include <linux/types.h>
 
 struct drm_connector;
+struct drm_connector_state;
+struct intel_atomic_state;
+struct intel_crtc;
+struct intel_crtc_state;
+struct intel_dp;
 
 bool intel_vrr_is_capable(struct drm_connector *connector);
+void intel_vrr_check_modeset(struct intel_atomic_state *state);
+void intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
+			      struct drm_connector_state *conn_state);
 
 #endif /* __INTEL_VRR_H__ */