diff options
| author | Kenneth Graunke <kenneth@whitecape.org> | 2014-02-26 23:59:31 -0800 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2014-03-05 21:30:29 +0100 |
| commit | 1411e6a57a1836ba8a3d4f17c8733b2fbaf0f005 (patch) | |
| tree | 6aaf52e8bdfe82e992859a3d5250464fb422c4d6 /drivers/gpu | |
| parent | c8966e1058e1e8ae2eec4211157847032829697a (diff) | |
drm/i915: Add thread stall DOP clock gating workaround on Broadwell.
Ben and I believe this will be necessary on production hardware.
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
[danvet: Shuffle lines to group all ROW_CHICKEN writes and add a
cautious comment that this might not be needed on production hw.]
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_reg.h | 1 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_pm.c | 5 |
2 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index d575baf52d5..aa8390978e6 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -5050,6 +5050,7 @@ #define GEN8_ROW_CHICKEN 0xe4f0 #define PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE (1<<8) +#define STALL_DOP_GATING_DISABLE (1<<5) #define GEN7_ROW_CHICKEN2 0xe4f4 #define GEN7_ROW_CHICKEN2_GT2 0xf4f4 diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index f21c9f3ee64..bb2ca355c1b 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -4805,6 +4805,11 @@ static void gen8_init_clock_gating(struct drm_device *dev) I915_WRITE(GEN8_ROW_CHICKEN, _MASKED_BIT_ENABLE(PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE)); + /* WaDisableThreadStallDopClockGating:bdw */ + /* FIXME: Unclear whether we really need this on production bdw. */ + I915_WRITE(GEN8_ROW_CHICKEN, + _MASKED_BIT_ENABLE(STALL_DOP_GATING_DISABLE)); + /* * This GEN8_CENTROID_PIXEL_OPT_DIS W/A is only needed for * pre-production hardware |