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drm/i915: Ignore GTFIFODBG FIFO free entry fields on CHV

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On CHV GTFIFODBG has some read-only bits to indicate the number
of free FIFO entries. Ignore these when checking to see if any
of the sticky error bits are set.

This gets rid of these during device resume:
[drm:cherryview_enable_rps] GT fifo had a previous error 1080000

While at it, move the assignments out of the if().

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1460570970-14073-1-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä
2016-04-13 21:09:30 +03:00
parent 0ccdacf694
commit 297b32ec7e
2 changed files with 8 additions and 3 deletions
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9
drivers/gpu/drm/i915/intel_pm.c
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@@ -4997,7 +4997,8 @@ static void gen6_enable_rps(struct drm_device *dev)
I915_WRITE(GEN6_RC_STATE, 0);
/* Clear the DBG now so we don't confuse earlier errors */
if ((gtfifodbg = I915_READ(GTFIFODBG))) {
gtfifodbg = I915_READ(GTFIFODBG);
if (gtfifodbg) {
DRM_ERROR("GT fifo had a previous error %x\n", gtfifodbg);
I915_WRITE(GTFIFODBG, gtfifodbg);
}
@@ -5528,7 +5529,8 @@ static void cherryview_enable_rps(struct drm_device *dev)
WARN_ON(!mutex_is_locked(&dev_priv->rps.hw_lock));
gtfifodbg = I915_READ(GTFIFODBG);
gtfifodbg = I915_READ(GTFIFODBG) & ~(GT_FIFO_SBDEDICATE_FREE_ENTRY_CHV |
GT_FIFO_FREE_ENTRIES_CHV);
if (gtfifodbg) {
DRM_DEBUG_DRIVER("GT fifo had a previous error %x\n",
gtfifodbg);
@@ -5627,7 +5629,8 @@ static void valleyview_enable_rps(struct drm_device *dev)
valleyview_check_pctx(dev_priv);
if ((gtfifodbg = I915_READ(GTFIFODBG))) {
gtfifodbg = I915_READ(GTFIFODBG);
if (gtfifodbg) {
DRM_DEBUG_DRIVER("GT fifo had a previous error %x\n",
gtfifodbg);
I915_WRITE(GTFIFODBG, gtfifodbg);