[PATCH 4/7] drm/i915: PCH_NOP suspend/resume

[ben at bwidawsk.net (Ben Widawsky)]

More registers we can't write.

Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
 drivers/gpu/drm/i915/i915_suspend.c | 58 +++++++++++++++++++++++++++----------
 1 file changed, 42 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_suspend.c b/drivers/gpu/drm/i915/i915_suspend.c
index 41f0fde..7f58c82 100644
--- a/drivers/gpu/drm/i915/i915_suspend.c
+++ b/drivers/gpu/drm/i915/i915_suspend.c
@@ -334,11 +334,19 @@ int i915_save_state(struct drm_device *dev)
 
 	mutex_lock(&dev->struct_mutex);
 
-	i915_save_display(dev);
+	if (!HAS_PCH_NOP(dev))
+		i915_save_display(dev);
 
 	if (!drm_core_check_feature(dev, DRIVER_MODESET)) {
 		/* Interrupt state */
-		if (HAS_PCH_SPLIT(dev)) {
+		if (HAS_PCH_NOP(dev)) {
+			dev_priv->regfile.saveDEIER = I915_READ(DEIER);
+			dev_priv->regfile.saveDEIMR = I915_READ(DEIMR);
+			dev_priv->regfile.saveGTIER = I915_READ(GTIER);
+			dev_priv->regfile.saveGTIMR = I915_READ(GTIMR);
+			dev_priv->regfile.saveMCHBAR_RENDER_STANDBY =
+				I915_READ(RSTDBYCTL);
+		} else if (HAS_PCH_SPLIT(dev)) {
 			dev_priv->regfile.saveDEIER = I915_READ(DEIER);
 			dev_priv->regfile.saveDEIMR = I915_READ(DEIMR);
 			dev_priv->regfile.saveGTIER = I915_READ(GTIER);
@@ -362,13 +370,19 @@ int i915_save_state(struct drm_device *dev)
 	/* Memory Arbitration state */
 	dev_priv->regfile.saveMI_ARB_STATE = I915_READ(MI_ARB_STATE);
 
-	/* Scratch space */
-	for (i = 0; i < 16; i++) {
-		dev_priv->regfile.saveSWF0[i] = I915_READ(SWF00 + (i << 2));
-		dev_priv->regfile.saveSWF1[i] = I915_READ(SWF10 + (i << 2));
+	if (!HAS_PCH_NOP(dev)) {
+		/* Scratch space
+		 * XXX: Do we really need this for kms? */
+		for (i = 0; i < 16; i++) {
+			dev_priv->regfile.saveSWF0[i] =
+				I915_READ(SWF00 + (i << 2));
+			dev_priv->regfile.saveSWF1[i] =
+				I915_READ(SWF10 + (i << 2));
+		}
+		for (i = 0; i < 3; i++)
+			dev_priv->regfile.saveSWF2[i] =
+				I915_READ(SWF30 + (i << 2));
 	}
-	for (i = 0; i < 3; i++)
-		dev_priv->regfile.saveSWF2[i] = I915_READ(SWF30 + (i << 2));
 
 	mutex_unlock(&dev->struct_mutex);
 
@@ -384,11 +398,17 @@ int i915_restore_state(struct drm_device *dev)
 
 	mutex_lock(&dev->struct_mutex);
 
-	i915_restore_display(dev);
+	if (!HAS_PCH_NOP(dev))
+		i915_restore_display(dev);
 
 	if (!drm_core_check_feature(dev, DRIVER_MODESET)) {
 		/* Interrupt state */
-		if (HAS_PCH_SPLIT(dev)) {
+		if (HAS_PCH_NOP(dev)) {
+			I915_WRITE(DEIER, dev_priv->regfile.saveDEIER);
+			I915_WRITE(DEIMR, dev_priv->regfile.saveDEIMR);
+			I915_WRITE(GTIER, dev_priv->regfile.saveGTIER);
+			I915_WRITE(GTIMR, dev_priv->regfile.saveGTIMR);
+		} else if (HAS_PCH_SPLIT(dev)) {
 			I915_WRITE(DEIER, dev_priv->regfile.saveDEIER);
 			I915_WRITE(DEIMR, dev_priv->regfile.saveDEIMR);
 			I915_WRITE(GTIER, dev_priv->regfile.saveGTIER);
@@ -408,16 +428,22 @@ int i915_restore_state(struct drm_device *dev)
 	/* Memory arbitration state */
 	I915_WRITE(MI_ARB_STATE, dev_priv->regfile.saveMI_ARB_STATE | 0xffff0000);
 
-	for (i = 0; i < 16; i++) {
-		I915_WRITE(SWF00 + (i << 2), dev_priv->regfile.saveSWF0[i]);
-		I915_WRITE(SWF10 + (i << 2), dev_priv->regfile.saveSWF1[i]);
+	if (!HAS_PCH_NOP(dev)) {
+		for (i = 0; i < 16; i++) {
+			I915_WRITE(SWF00 + (i << 2),
+				   dev_priv->regfile.saveSWF0[i]);
+			I915_WRITE(SWF10 + (i << 2),
+				   dev_priv->regfile.saveSWF1[i]);
+		}
+		for (i = 0; i < 3; i++)
+			I915_WRITE(SWF30 + (i << 2),
+				   dev_priv->regfile.saveSWF2[i]);
 	}
-	for (i = 0; i < 3; i++)
-		I915_WRITE(SWF30 + (i << 2), dev_priv->regfile.saveSWF2[i]);
 
 	mutex_unlock(&dev->struct_mutex);
 
-	intel_i2c_reset(dev);
+	if (!HAS_PCH_NOP(dev))
+		intel_i2c_reset(dev);
 
 	return 0;
 }
-- 
1.8.2