[PATCH 15/27] drm/i915/vrr: Avoid sending PUSH when VRR TG is used with Fixed refresh rate

[Ankit Nautiyal]

As per the spec, the PUSH enable must be set if not configuring for a
fixed refresh rate (i.e Vmin == Flipline == Vmax is not true).

v2: Use helper intel_vrr_use_push(). (Ville)
v3: directly use the condition, instead of checking for VRR mode.

Bspec: 68925
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
Reviewed-by: Mitul Golani <mitulkumar.ajitkumar.golani at intel.com> (v1)
---
 drivers/gpu/drm/i915/display/intel_vrr.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c
index 82a872bdb078..576051d0fd36 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -431,13 +431,18 @@ void intel_vrr_set_transcoder_timings(const struct intel_crtc_state *crtc_state)
 		       crtc_state->vrr.flipline - 1);
 }
 
+static bool intel_vrr_use_push(const struct intel_crtc_state *crtc_state)
+{
+	return crtc_state->vrr.flipline != crtc_state->vrr.vmax;
+}
+
 void intel_vrr_send_push(struct intel_dsb *dsb,
 			 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 (!intel_vrrtg_is_enabled(crtc_state))
+	if (!intel_vrr_use_push(crtc_state))
 		return;
 
 	if (dsb)
@@ -456,7 +461,7 @@ bool intel_vrr_is_push_sent(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 (!intel_vrrtg_is_enabled(crtc_state))
+	if (!intel_vrr_use_push(crtc_state))
 		return false;
 
 	return intel_de_read(display, TRANS_PUSH(display, cpu_transcoder)) & TRANS_PUSH_SEND;
@@ -470,8 +475,9 @@ void intel_vrr_enable(const struct intel_crtc_state *crtc_state)
 	if (!intel_vrrtg_is_enabled(crtc_state))
 		return;
 
-	intel_de_write(display, TRANS_PUSH(display, cpu_transcoder),
-		       TRANS_PUSH_EN);
+	if (intel_vrr_use_push(crtc_state))
+		intel_de_write(display, TRANS_PUSH(display, cpu_transcoder),
+			       TRANS_PUSH_EN);
 
 	if (HAS_AS_SDP(display))
 		intel_de_write(display,
-- 
2.45.2