[PATCH v18 8/9] drm/i915/display: Compute vrr_vsync params

[Mitul Golani]

Compute vrr_vsync_start/end, which sets the position
for hardware to send the Vsync at a fixed position
relative to the end of the Vblank.

--v2:
- Updated VSYNC_START/END macros to VRR_VSYNC_START/END. (Ankit)
- Updated bit fields of VRR_VSYNC_START/END. (Ankit)

--v3:
- Add PIPE_CONF_CHECK_I(vrr.vsync_start/end).
- Read/write vrr_vsync params only when we intend to send
adaptive_sync sdp.

--v4:
- Use VRR_SYNC_START/END macros correctly.

Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani at intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c  |  2 ++
 .../drm/i915/display/intel_display_types.h    |  1 +
 drivers/gpu/drm/i915/display/intel_vrr.c      | 30 +++++++++++++++++--
 drivers/gpu/drm/i915/i915_reg.h               |  7 +++++
 4 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 8f1d948408d3..fed4ed18d53b 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -5377,6 +5377,8 @@ intel_pipe_config_compare(const struct intel_crtc_state *current_config,
 		PIPE_CONF_CHECK_I(vrr.flipline);
 		PIPE_CONF_CHECK_I(vrr.pipeline_full);
 		PIPE_CONF_CHECK_I(vrr.guardband);
+		PIPE_CONF_CHECK_I(vrr.vsync_start);
+		PIPE_CONF_CHECK_I(vrr.vsync_end);
 	}
 
 #undef PIPE_CONF_CHECK_X
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 8a286751dc39..c2e08f641989 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1430,6 +1430,7 @@ struct intel_crtc_state {
 		bool enable, in_range;
 		u8 pipeline_full;
 		u16 flipline, vmin, vmax, guardband;
+		u32 vsync_end, vsync_start;
 	} vrr;
 
 	/* Stream Splitter for eDP MSO */
diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c
index eb5bd0743902..ed38fee196b8 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -9,6 +9,7 @@
 #include "intel_de.h"
 #include "intel_display_types.h"
 #include "intel_vrr.h"
+#include "intel_dp.h"
 
 bool intel_vrr_is_capable(struct intel_connector *connector)
 {
@@ -113,6 +114,7 @@ intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
 	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
 	struct intel_connector *connector =
 		to_intel_connector(conn_state->connector);
+	struct intel_dp *intel_dp = intel_attached_dp(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;
@@ -165,6 +167,15 @@ intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
 	if (crtc_state->uapi.vrr_enabled) {
 		crtc_state->vrr.enable = true;
 		crtc_state->mode_flags |= I915_MODE_FLAG_VRR;
+
+		if (intel_dp_as_sdp_supported(intel_dp)) {
+			crtc_state->vrr.vsync_start =
+				(crtc_state->hw.adjusted_mode.crtc_vtotal -
+					crtc_state->hw.adjusted_mode.vsync_start);
+			crtc_state->vrr.vsync_end =
+				(crtc_state->hw.adjusted_mode.crtc_vtotal -
+					crtc_state->hw.adjusted_mode.vsync_end);
+		}
 	}
 }
 
@@ -204,6 +215,11 @@ void intel_vrr_set_transcoder_timings(const struct intel_crtc_state *crtc_state)
 	intel_de_write(dev_priv, TRANS_VRR_VMAX(cpu_transcoder), crtc_state->vrr.vmax - 1);
 	intel_de_write(dev_priv, TRANS_VRR_CTL(cpu_transcoder), trans_vrr_ctl(crtc_state));
 	intel_de_write(dev_priv, TRANS_VRR_FLIPLINE(cpu_transcoder), crtc_state->vrr.flipline - 1);
+
+	if (crtc_state->vrr.vsync_end && crtc_state->vrr.vsync_start)
+		intel_de_write(dev_priv, TRANS_VRR_VSYNC(cpu_transcoder),
+			       VRR_VSYNC_END(crtc_state->hw.adjusted_mode.vsync_end) |
+				   VRR_VSYNC_START(crtc_state->hw.adjusted_mode.vsync_start));
 }
 
 void intel_vrr_send_push(const struct intel_crtc_state *crtc_state)
@@ -264,7 +280,7 @@ void intel_vrr_get_config(struct intel_crtc_state *crtc_state)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
 	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
-	u32 trans_vrr_ctl;
+	u32 trans_vrr_ctl, trans_vrr_vsync;
 
 	trans_vrr_ctl = intel_de_read(dev_priv, TRANS_VRR_CTL(cpu_transcoder));
 
@@ -284,6 +300,16 @@ void intel_vrr_get_config(struct intel_crtc_state *crtc_state)
 		crtc_state->vrr.vmin = intel_de_read(dev_priv, TRANS_VRR_VMIN(cpu_transcoder)) + 1;
 	}
 
-	if (crtc_state->vrr.enable)
+	if (crtc_state->vrr.enable) {
 		crtc_state->mode_flags |= I915_MODE_FLAG_VRR;
+
+		if (HAS_AS_SDP(dev_priv)) {
+			trans_vrr_vsync =
+				intel_de_read(dev_priv, TRANS_VRR_VSYNC(cpu_transcoder));
+			crtc_state->vrr.vsync_start =
+				REG_FIELD_GET(VRR_VSYNC_START_MASK, trans_vrr_vsync);
+			crtc_state->vrr.vsync_end =
+				REG_FIELD_GET(VRR_VSYNC_END_MASK, trans_vrr_vsync);
+		}
+	}
 }
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 9bda3a24cd94..9512f4c58094 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2095,6 +2095,13 @@
 #define   TRANS_PUSH_EN			REG_BIT(31)
 #define   TRANS_PUSH_SEND		REG_BIT(30)
 
+#define _TRANS_VRR_VSYNC_A		0x60078
+#define TRANS_VRR_VSYNC(trans)		_MMIO_TRANS2(trans, _TRANS_VRR_VSYNC_A)
+#define VRR_VSYNC_END_MASK		REG_GENMASK(28, 16)
+#define VRR_VSYNC_END(vsync_end)	REG_FIELD_PREP(VRR_VSYNC_END_MASK, (vsync_end))
+#define VRR_VSYNC_START_MASK		REG_GENMASK(12, 0)
+#define VRR_VSYNC_START(vsync_start)	REG_FIELD_PREP(VRR_VSYNC_START_MASK, (vsync_start))
+
 /* VGA port control */
 #define ADPA			_MMIO(0x61100)
 #define PCH_ADPA                _MMIO(0xe1100)
-- 
2.25.1