drm/i915/vrr: drop window2_delay member from i915

The window2_delay member has been functionally unused (always set to 0)
since it was added in commit bb265dbdf38d ("drm/i915/xelpd: Add VRR
guardband for VRR CTL"). Replace it with a FIXME comment.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/036955dc2c4c2d2b2d89555e473d91ce1be10395.1661346845.git.jani.nikula@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 9dee856..651b230 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -8686,8 +8686,6 @@ int intel_modeset_init_noirq(struct drm_i915_private *i915)
        i915->flip_wq = alloc_workqueue("i915_flip", WQ_HIGHPRI |
                                        WQ_UNBOUND, WQ_UNBOUND_MAX_ACTIVE);
 
-       i915->window2_delay = 0; /* No DSB so no window2 delay */
-
        intel_mode_config_init(i915);
 
        ret = intel_cdclk_init(i915);

diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c
index 04250a0..5eac990 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -142,11 +142,16 @@ intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
         * For XE_LPD+, we use guardband and pipeline override
         * is deprecated.
         */
-       if (DISPLAY_VER(i915) >= 13)
+       if (DISPLAY_VER(i915) >= 13) {
+               /*
+                * FIXME: Subtract Window2 delay from below value.
+                *
+                * Window2 specifies time required to program DSB (Window2) in
+                * number of scan lines. Assuming 0 for no DSB.
+                */
                crtc_state->vrr.guardband =
-                       crtc_state->vrr.vmin - adjusted_mode->crtc_vdisplay -
-                       i915->window2_delay;
-       else
+                       crtc_state->vrr.vmin - adjusted_mode->crtc_vdisplay;
+       } else {
                /*
                 * FIXME: s/4/framestart_delay/ to get consistent
                 * earliest/latest points for register latching regardless
@@ -159,6 +164,7 @@ intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
                 */
                crtc_state->vrr.pipeline_full =
                        min(255, crtc_state->vrr.vmin - adjusted_mode->crtc_vdisplay - 4 - 1);
+       }
 
        crtc_state->mode_flags |= I915_MODE_FLAG_VRR;
 }

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 78ade0c..e3d7ffa 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -512,9 +512,6 @@ struct drm_i915_private {
                struct file *mmap_singleton;
        } gem;
 
-       /* Window2 specifies time required to program DSB (Window2) in number of scan lines */
-       u8 window2_delay;
-
        u8 pch_ssc_use;
 
        /* For i915gm/i945gm vblank irq workaround */