drm/msm/sde: Trigger panel reset after first kickoff on non-60 Hz

If we're using a refresh rate different from what the bootloader
initializes the display with, a panel reset is necessary for our custom
refresh rate to take effect.

After the first kickoff, request a panel reset from userspace using the
existing ESD recovery mechanism to update the refresh rate. Note that
this is only done if the target refresh rate is *not* 60 Hz because this
is redundant if we don't need a refresh rate update.

Signed-off-by: Danny Lin <[email protected]>

drivers/gpu/drm/msm/sde/sde_encoder.c

@@ -999,6 +999,7 @@ void sde_encoder_prepare_for_kickoff(struct drm_encoder *drm_enc)
 
 void sde_encoder_kickoff(struct drm_encoder *drm_enc)
 {
+	static bool first_run = true;
 	struct sde_encoder_virt *sde_enc;
 	struct sde_encoder_phys *phys;
 	unsigned int i;
@@ -1027,6 +1028,33 @@ void sde_encoder_kickoff(struct drm_encoder *drm_enc)
 		if (phys && phys->ops.handle_post_kickoff)
 			phys->ops.handle_post_kickoff(phys);
 	}
+
+	if (sde_enc->disp_info.intf_type == DRM_MODE_CONNECTOR_DSI &&
+			!_sde_encoder_wakeup_time(drm_enc, &wakeup_time)) {
+		SDE_EVT32_VERBOSE(ktime_to_ms(wakeup_time));
+		mod_timer(&sde_enc->vsync_event_timer,
+				nsecs_to_jiffies(ktime_to_ns(wakeup_time)));
+	}
+
+	/*
+	 * Trigger a panel reset if this is the first kickoff and the refresh
+	 * rate is not 60 Hz
+	 */
+	if (cmpxchg(&first_run, true, false) &&
+	    sde_enc->crtc->mode.vrefresh != 60) {
+		struct sde_connector *conn = container_of(phys->connector, struct sde_connector, base);
+		struct drm_event event = {
+			.type = DRM_EVENT_PANEL_DEAD,
+			.length = sizeof(bool)
+		};
+
+		conn->panel_dead = true;
+		event.type = DRM_EVENT_PANEL_DEAD;
+		event.length = sizeof(bool);
+		msm_mode_object_event_notify(&conn->base.base,
+			conn->base.dev, &event, (u8 *) &conn->panel_dead);
+	}
+
 	SDE_ATRACE_END("encoder_kickoff");
 }