FAILED: patch "[PATCH] drm/i915/psr: Chase psr.enabled only under the psr.lock" failed to apply to 4.17-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 4.17-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

>From daeb725e919c0d2d4b628aeaa1fa053125f888b2 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Thu, 5 Apr 2018 12:49:15 +0100
Subject: [PATCH] drm/i915/psr: Chase psr.enabled only under the psr.lock

Inside the psr work function, we want to wait for PSR to idle first and
wish to do so without blocking the normal modeset path, so we do so
without holding the PSR lock. However, we first have to find which pipe
PSR was enabled on, which requires chasing into the PSR struct and
requires locking to prevent intel_psr_disable() from concurrently
setting our pointer to NULL.

Fixes: 995d30477496 ("drm/i915: VLV/CHV PSR Software timer mode")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Durgadoss R <durgadoss.r@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: <stable@vger.kernel.org> # v4.0+
Reviewed-by: Jose Roberto de Souza <jose.souza@intel.com>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180405114915.29609-1-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
index 2d53f7398a6d..69a5b276f4d8 100644
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -775,53 +775,59 @@ void intel_psr_disable(struct intel_dp *intel_dp,
 	cancel_delayed_work_sync(&dev_priv->psr.work);
 }
 
-static void intel_psr_work(struct work_struct *work)
+static bool psr_wait_for_idle(struct drm_i915_private *dev_priv)
 {
-	struct drm_i915_private *dev_priv =
-		container_of(work, typeof(*dev_priv), psr.work.work);
-	struct intel_dp *intel_dp = dev_priv->psr.enabled;
-	struct drm_crtc *crtc = dp_to_dig_port(intel_dp)->base.base.crtc;
-	enum pipe pipe = to_intel_crtc(crtc)->pipe;
+	struct intel_dp *intel_dp;
+	i915_reg_t reg;
+	u32 mask;
+	int err;
+
+	intel_dp = dev_priv->psr.enabled;
+	if (!intel_dp)
+		return false;
 
-	/* We have to make sure PSR is ready for re-enable
-	 * otherwise it keeps disabled until next full enable/disable cycle.
-	 * PSR might take some time to get fully disabled
-	 * and be ready for re-enable.
-	 */
 	if (HAS_DDI(dev_priv)) {
 		if (dev_priv->psr.psr2_enabled) {
-			if (intel_wait_for_register(dev_priv,
-						    EDP_PSR2_STATUS,
-						    EDP_PSR2_STATUS_STATE_MASK,
-						    0,
-						    50)) {
-				DRM_ERROR("Timed out waiting for PSR2 Idle for re-enable\n");
-				return;
-			}
+			reg = EDP_PSR2_STATUS;
+			mask = EDP_PSR2_STATUS_STATE_MASK;
 		} else {
-			if (intel_wait_for_register(dev_priv,
-						    EDP_PSR_STATUS,
-						    EDP_PSR_STATUS_STATE_MASK,
-						    0,
-						    50)) {
-				DRM_ERROR("Timed out waiting for PSR Idle for re-enable\n");
-				return;
-			}
+			reg = EDP_PSR_STATUS;
+			mask = EDP_PSR_STATUS_STATE_MASK;
 		}
 	} else {
-		if (intel_wait_for_register(dev_priv,
-					    VLV_PSRSTAT(pipe),
-					    VLV_EDP_PSR_IN_TRANS,
-					    0,
-					    1)) {
-			DRM_ERROR("Timed out waiting for PSR Idle for re-enable\n");
-			return;
-		}
+		struct drm_crtc *crtc =
+			dp_to_dig_port(intel_dp)->base.base.crtc;
+		enum pipe pipe = to_intel_crtc(crtc)->pipe;
+
+		reg = VLV_PSRSTAT(pipe);
+		mask = VLV_EDP_PSR_IN_TRANS;
 	}
+
+	mutex_unlock(&dev_priv->psr.lock);
+
+	err = intel_wait_for_register(dev_priv, reg, mask, 0, 50);
+	if (err)
+		DRM_ERROR("Timed out waiting for PSR Idle for re-enable\n");
+
+	/* After the unlocked wait, verify that PSR is still wanted! */
 	mutex_lock(&dev_priv->psr.lock);
-	intel_dp = dev_priv->psr.enabled;
+	return err == 0 && dev_priv->psr.enabled;
+}
 
-	if (!intel_dp)
+static void intel_psr_work(struct work_struct *work)
+{
+	struct drm_i915_private *dev_priv =
+		container_of(work, typeof(*dev_priv), psr.work.work);
+
+	mutex_lock(&dev_priv->psr.lock);
+
+	/*
+	 * We have to make sure PSR is ready for re-enable
+	 * otherwise it keeps disabled until next full enable/disable cycle.
+	 * PSR might take some time to get fully disabled
+	 * and be ready for re-enable.
+	 */
+	if (!psr_wait_for_idle(dev_priv))
 		goto unlock;
 
 	/*
@@ -832,7 +838,7 @@ static void intel_psr_work(struct work_struct *work)
 	if (dev_priv->psr.busy_frontbuffer_bits)
 		goto unlock;
 
-	intel_psr_activate(intel_dp);
+	intel_psr_activate(dev_priv->psr.enabled);
 unlock:
 	mutex_unlock(&dev_priv->psr.lock);
 }