[PATCH 05/19] drm/i915/vrr: Track vrr.enable only for variable timing

[Ankit Nautiyal]

Since CMRR is now disabled, use the flag vrr.enable to tracks if vrr timing
generator is used with variable timings.

Avoid setting vrr.enable for CMRR and adjust readout to not set vrr.enable
when vmax == vmin == flipline (fixed refresh rate timing).

Signed-off-by: Ankit Nautiyal <ankit.k.nauti...@intel.com>
---
 drivers/gpu/drm/i915/display/intel_vrr.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c 
b/drivers/gpu/drm/i915/display/intel_vrr.c
index 0ee7fb0362ce..efa2aa284285 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -226,7 +226,6 @@ cmrr_get_vtotal(struct intel_crtc_state *crtc_state, bool 
video_mode_required)
 static
 void intel_vrr_compute_cmrr_timings(struct intel_crtc_state *crtc_state)
 {
-       crtc_state->vrr.enable = true;
        crtc_state->cmrr.enable = true;
        /*
         * TODO: Compute precise target refresh rate to determine
@@ -528,6 +527,14 @@ void intel_vrr_disable(const struct intel_crtc_state 
*old_crtc_state)
        intel_de_write(display, TRANS_PUSH(display, cpu_transcoder), 0);
 }
 
+static
+bool intel_vrr_is_fixed_rr(const struct intel_crtc_state *crtc_state)
+{
+       return crtc_state->vrr.flipline &&
+              crtc_state->vrr.flipline == crtc_state->vrr.vmax &&
+              crtc_state->vrr.flipline == crtc_state->vrr.vmin;
+}
+
 void intel_vrr_get_config(struct intel_crtc_state *crtc_state)
 {
        struct intel_display *display = to_intel_display(crtc_state);
@@ -537,7 +544,6 @@ void intel_vrr_get_config(struct intel_crtc_state 
*crtc_state)
        trans_vrr_ctl = intel_de_read(display,
                                      TRANS_VRR_CTL(display, cpu_transcoder));
 
-       crtc_state->vrr.enable = trans_vrr_ctl & VRR_CTL_VRR_ENABLE;
        if (HAS_CMRR(display))
                crtc_state->cmrr.enable = (trans_vrr_ctl & VRR_CTL_CMRR_ENABLE);
 
@@ -577,6 +583,9 @@ void intel_vrr_get_config(struct intel_crtc_state 
*crtc_state)
                }
        }
 
+       crtc_state->vrr.enable = trans_vrr_ctl & VRR_CTL_VRR_ENABLE &&
+                                !intel_vrr_is_fixed_rr(crtc_state);
+
        if (crtc_state->vrr.enable)
                crtc_state->mode_flags |= I915_MODE_FLAG_VRR;
 }
-- 
2.45.2