[Intel-gfx] [PATCH 2/2] drm/i915: Remove save/restore of physical HWS_PGA register

[Chris Wilson]

Now that we always restore the HWS registers (both physical and GTT
virtual addresses) when re-initialising the rings, we can eliminate the
superfluous save/restore of the register across suspend and resume.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_drv.h     |    1 -
 drivers/gpu/drm/i915/i915_suspend.c |    8 --------
 2 files changed, 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 4a78b66..07be2ab 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -407,7 +407,6 @@ struct i915_suspend_saved_registers {
 	u32 saveDSPACNTR;
 	u32 saveDSPBCNTR;
 	u32 saveDSPARB;
-	u32 saveHWS;
 	u32 savePIPEACONF;
 	u32 savePIPEBCONF;
 	u32 savePIPEASRC;
diff --git a/drivers/gpu/drm/i915/i915_suspend.c b/drivers/gpu/drm/i915/i915_suspend.c
index a818eba..63d4d30 100644
--- a/drivers/gpu/drm/i915/i915_suspend.c
+++ b/drivers/gpu/drm/i915/i915_suspend.c
@@ -811,10 +811,6 @@ int i915_save_state(struct drm_device *dev)
 
 	mutex_lock(&dev->struct_mutex);
 
-	/* Hardware status page */
-	if (!drm_core_check_feature(dev, DRIVER_MODESET))
-		dev_priv->regfile.saveHWS = I915_READ(HWS_PGA);
-
 	i915_save_display(dev);
 
 	if (!drm_core_check_feature(dev, DRIVER_MODESET)) {
@@ -865,10 +861,6 @@ int i915_restore_state(struct drm_device *dev)
 
 	mutex_lock(&dev->struct_mutex);
 
-	/* Hardware status page */
-	if (!drm_core_check_feature(dev, DRIVER_MODESET))
-		I915_WRITE(HWS_PGA, dev_priv->regfile.saveHWS);
-
 	i915_restore_display(dev);
 
 	if (!drm_core_check_feature(dev, DRIVER_MODESET)) {
-- 
1.7.10.4