diff options
| author | Ben Widawsky <ben@bwidawsk.net> | 2012-02-09 10:15:18 +0100 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2012-02-12 00:21:16 +0100 |
| commit | dd202c6dd612beecf87b8b85c2f09b23f77364a2 (patch) | |
| tree | 2b4a3b103f81b5da0514b34224efd2055fc65797 /drivers/gpu/drm/i915/intel_display.c | |
| parent | 5f7f726d2caf1e51a39872e5a30b6984235d388e (diff) | |
drm/i915: use gtfifodbg
Add register definitions for GTFIFODBG, and clear it during init time to
make sure state is correct.
This register tells us if either a read, or a write occurred while the
fifo was full. It seems like bit 2 is an OR of bit 0 and bit 1, so we
check that as well, but the documents are not quite clear.
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by (v1): Eugeni Dodonov <eugeni.dodonov@intel.com>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_display.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_display.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 7fae6917beab..db7ccbbb97c5 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -8241,6 +8241,7 @@ void gen6_enable_rps(struct drm_i915_private *dev_priv) u32 rp_state_cap = I915_READ(GEN6_RP_STATE_CAP); u32 gt_perf_status = I915_READ(GEN6_GT_PERF_STATUS); u32 pcu_mbox, rc6_mask = 0; + u32 gtfifodbg; int cur_freq, min_freq, max_freq; int i; @@ -8252,6 +8253,13 @@ void gen6_enable_rps(struct drm_i915_private *dev_priv) */ I915_WRITE(GEN6_RC_STATE, 0); mutex_lock(&dev_priv->dev->struct_mutex); + + /* Clear the DBG now so we don't confuse earlier errors */ + if ((gtfifodbg = I915_READ(GTFIFODBG))) { + DRM_ERROR("GT fifo had a previous error %x\n", gtfifodbg); + I915_WRITE(GTFIFODBG, gtfifodbg); + } + gen6_gt_force_wake_get(dev_priv); /* disable the counters and set deterministic thresholds */ |