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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2016-06-30 17:33:45 +0300 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2016-06-30 17:42:34 +0300 |
| commit | 76f8421f2a67cdecd616705b7a0c3750d6d42c05 (patch) | |
| tree | ef1c0b47412308e20c7e839ffef4e199b95b965a /drivers/gpu/drm/i915/intel_ringbuffer.c | |
| parent | 87273b7110a031c7b258f8c05efcd88194f79fe8 (diff) | |
| download | linux-76f8421f2a67cdecd616705b7a0c3750d6d42c05.tar.xz | |
drm/i915: Perform Sandybridge BSD tail write under the forcewake
Since we have a sequence of register reads and writes, we can reduce the
latency of starting the BSD ring by performing all the mmio operations
under the same forcewake wakeref.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1467297225-21379-62-git-send-email-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/intel_ringbuffer.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_ringbuffer.c | 28 |
1 files changed, 16 insertions, 12 deletions
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index c4365cc1f133..7c93d4c210e5 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -2684,34 +2684,38 @@ static void gen6_bsd_ring_write_tail(struct intel_engine_cs *engine, { struct drm_i915_private *dev_priv = engine->i915; + intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL); + /* Every tail move must follow the sequence below */ /* Disable notification that the ring is IDLE. The GT * will then assume that it is busy and bring it out of rc6. */ - I915_WRITE(GEN6_BSD_SLEEP_PSMI_CONTROL, - _MASKED_BIT_ENABLE(GEN6_BSD_SLEEP_MSG_DISABLE)); + I915_WRITE_FW(GEN6_BSD_SLEEP_PSMI_CONTROL, + _MASKED_BIT_ENABLE(GEN6_BSD_SLEEP_MSG_DISABLE)); /* Clear the context id. Here be magic! */ - I915_WRITE64(GEN6_BSD_RNCID, 0x0); + I915_WRITE64_FW(GEN6_BSD_RNCID, 0x0); /* Wait for the ring not to be idle, i.e. for it to wake up. */ - if (intel_wait_for_register(dev_priv, - GEN6_BSD_SLEEP_PSMI_CONTROL, - GEN6_BSD_SLEEP_INDICATOR, - 0, - 50)) + if (intel_wait_for_register_fw(dev_priv, + GEN6_BSD_SLEEP_PSMI_CONTROL, + GEN6_BSD_SLEEP_INDICATOR, + 0, + 50)) DRM_ERROR("timed out waiting for the BSD ring to wake up\n"); /* Now that the ring is fully powered up, update the tail */ - I915_WRITE_TAIL(engine, value); - POSTING_READ(RING_TAIL(engine->mmio_base)); + I915_WRITE_FW(RING_TAIL(engine->mmio_base), value); + POSTING_READ_FW(RING_TAIL(engine->mmio_base)); /* Let the ring send IDLE messages to the GT again, * and so let it sleep to conserve power when idle. */ - I915_WRITE(GEN6_BSD_SLEEP_PSMI_CONTROL, - _MASKED_BIT_DISABLE(GEN6_BSD_SLEEP_MSG_DISABLE)); + I915_WRITE_FW(GEN6_BSD_SLEEP_PSMI_CONTROL, + _MASKED_BIT_DISABLE(GEN6_BSD_SLEEP_MSG_DISABLE)); + + intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL); } static int gen6_bsd_ring_flush(struct drm_i915_gem_request *req, |