[PATCH 08/16] drm/i915/display: Use fixed_rr timings in modeset sequence

[Ankit Nautiyal <ankit.k.nautiyal@intel.com>]

During modeset enable sequence, program the fixed timings, and turn on the
VRR Timing Generator (VRR TG) for platforms that always use VRR TG.

For this intel_vrr_set_transcoder now always programs fixed timings.
Later if vrr timings are required, vrr_enable() will switch
to the real VRR timings.

For platforms that will always use VRR TG, the VRR_CTL Enable bit is set
and reset in the transcoder enable/disable path.

v2: Update intel_vrr_set_transcoder_timings for fixed_rr.
v3: Update intel_set_transcoder_timings_lrr for fixed_rr. (Ville)
v4: Have separate functions to enable/disable VRR CTL
v5:
-For platforms that do not always have VRRTG on, do write bits other
than enable bit and also use write the TRANS_VRR_PUSH register. (Ville)
-Avoid writing trans_ctl_vrr if !vrr_possible().
v6:
-Disable VRR just before intel_ddi_disable_transcoder_func(). (Ville)
-Correct the sequence of configuring PUSH and VRR Enable/Disable. (Ville)
v7: Reset trans_vrr_ctl to 0 unconditionally in
intel_vrr_transcoder_disable(). (Ville)
v8: Reset trans_vrr_ctl if flipline is not set. (Ville)

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_ddi.c    |  5 ++
 drivers/gpu/drm/i915/display/intel_dp_mst.c |  4 ++
 drivers/gpu/drm/i915/display/intel_vrr.c    | 51 +++++++++++++++++----
 drivers/gpu/drm/i915/display/intel_vrr.h    |  2 +
 4 files changed, 54 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index f38c998935b9..44f4465c27e2 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -78,6 +78,7 @@
 #include "intel_tc.h"
 #include "intel_vdsc.h"
 #include "intel_vdsc_regs.h"
+#include "intel_vrr.h"
 #include "skl_scaler.h"
 #include "skl_universal_plane.h"
 
@@ -3249,6 +3250,8 @@ static void intel_ddi_post_disable_hdmi_or_sst(struct intel_atomic_state *state,
 		drm_dp_dpcd_poll_act_handled(&intel_dp->aux, 0);
 	}
 
+	intel_vrr_transcoder_disable(old_crtc_state);
+
 	intel_ddi_disable_transcoder_func(old_crtc_state);
 
 	for_each_pipe_crtc_modeset_disable(display, pipe_crtc, old_crtc_state, i) {
@@ -3522,6 +3525,8 @@ static void intel_ddi_enable(struct intel_atomic_state *state,
 
 	intel_ddi_enable_transcoder_func(encoder, crtc_state);
 
+	intel_vrr_transcoder_enable(crtc_state);
+
 	/* Enable/Disable DP2.0 SDP split config before transcoder */
 	intel_audio_sdp_split_update(crtc_state);
 
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index bd47cf127b4c..d2988b9a6e7b 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -1065,6 +1065,8 @@ static void mst_stream_post_disable(struct intel_atomic_state *state,
 	drm_dp_remove_payload_part2(&intel_dp->mst.mgr, new_mst_state,
 				    old_payload, new_payload);
 
+	intel_vrr_transcoder_disable(old_crtc_state);
+
 	intel_ddi_disable_transcoder_func(old_crtc_state);
 
 	for_each_pipe_crtc_modeset_disable(display, pipe_crtc, old_crtc_state, i) {
@@ -1326,6 +1328,8 @@ static void mst_stream_enable(struct intel_atomic_state *state,
 
 	intel_ddi_enable_transcoder_func(encoder, pipe_config);
 
+	intel_vrr_transcoder_enable(pipe_config);
+
 	intel_ddi_clear_act_sent(encoder, pipe_config);
 
 	intel_de_rmw(display, TRANS_DDI_FUNC_CTL(display, trans), 0,
diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c
index 8a0d27666ea7..96b6b730bea4 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -479,14 +479,7 @@ void intel_vrr_set_transcoder_timings(const struct intel_crtc_state *crtc_state)
 			       lower_32_bits(crtc_state->cmrr.cmrr_n));
 	}
 
-	intel_de_write(display, TRANS_VRR_VMIN(display, cpu_transcoder),
-		       crtc_state->vrr.vmin - 1);
-	intel_de_write(display, TRANS_VRR_VMAX(display, cpu_transcoder),
-		       crtc_state->vrr.vmax - 1);
-	intel_de_write(display, TRANS_VRR_CTL(display, cpu_transcoder),
-		       trans_vrr_ctl(crtc_state));
-	intel_de_write(display, TRANS_VRR_FLIPLINE(display, cpu_transcoder),
-		       crtc_state->vrr.flipline - 1);
+	intel_vrr_set_fixed_rr_timings(crtc_state);
 
 	if (HAS_AS_SDP(display))
 		intel_de_write(display,
@@ -620,6 +613,48 @@ void intel_vrr_disable(const struct intel_crtc_state *old_crtc_state)
 	intel_vrr_set_fixed_rr_timings(old_crtc_state);
 }
 
+void intel_vrr_transcoder_enable(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_display *display = to_intel_display(crtc_state);
+	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
+
+	if (!HAS_VRR(display))
+		return;
+
+	if (!intel_vrr_possible(crtc_state))
+		return;
+
+	if (!intel_vrr_always_use_vrr_tg(display)) {
+		intel_de_write(display, TRANS_VRR_CTL(display, cpu_transcoder),
+			       trans_vrr_ctl(crtc_state));
+		return;
+	}
+
+	intel_de_write(display, TRANS_PUSH(display, cpu_transcoder),
+		       TRANS_PUSH_EN);
+
+	intel_de_write(display, TRANS_VRR_CTL(display, cpu_transcoder),
+		       VRR_CTL_VRR_ENABLE | trans_vrr_ctl(crtc_state));
+}
+
+void intel_vrr_transcoder_disable(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_display *display = to_intel_display(crtc_state);
+	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
+
+	if (!HAS_VRR(display))
+		return;
+
+	if (!intel_vrr_possible(crtc_state))
+		return;
+
+	intel_de_write(display, TRANS_VRR_CTL(display, cpu_transcoder), 0);
+
+	intel_de_wait_for_clear(display, TRANS_VRR_STATUS(display, cpu_transcoder),
+				VRR_STATUS_VRR_EN_LIVE, 1000);
+	intel_de_write(display, TRANS_PUSH(display, cpu_transcoder), 0);
+}
+
 bool intel_vrr_is_fixed_rr(const struct intel_crtc_state *crtc_state)
 {
 	return crtc_state->vrr.flipline &&
diff --git a/drivers/gpu/drm/i915/display/intel_vrr.h b/drivers/gpu/drm/i915/display/intel_vrr.h
index 65d2b0eead51..859f1dc8a6d7 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.h
+++ b/drivers/gpu/drm/i915/display/intel_vrr.h
@@ -36,5 +36,7 @@ int intel_vrr_vmax_vblank_start(const struct intel_crtc_state *crtc_state);
 int intel_vrr_vmin_vblank_start(const struct intel_crtc_state *crtc_state);
 int intel_vrr_vblank_delay(const struct intel_crtc_state *crtc_state);
 bool intel_vrr_is_fixed_rr(const struct intel_crtc_state *crtc_state);
+void intel_vrr_transcoder_enable(const struct intel_crtc_state *crtc_state);
+void intel_vrr_transcoder_disable(const struct intel_crtc_state *crtc_state);
 
 #endif /* __INTEL_VRR_H__ */
-- 
2.45.2