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| author | Ben Widawsky <ben@bwidawsk.net> | 2012-04-14 18:41:32 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-06-01 15:12:59 +0800 |
| commit | aa8878bc13c76b9d8b52e55210e2c940987a5fb8 (patch) | |
| tree | d2f239f6f637c5665a4b9244328160948fb9acdf /drivers/gpu | |
| parent | 98cfca8e0d48cd792d830198a34617668b10ed2c (diff) | |
| download | lwn-aa8878bc13c76b9d8b52e55210e2c940987a5fb8.tar.gz lwn-aa8878bc13c76b9d8b52e55210e2c940987a5fb8.zip | |
drm/i915: [GEN7] Use HW scheduler for fixed function shaders
commit a1e969e0332de7a430e62822cee8f2ec8d83cd7c upstream.
This originally started as a patch from Bernard as a way of simply
setting the VS scheduler. After submitting the RFC patch, we decided to
also modify the DS scheduler. To be most explicit, I've made the patch
explicitly set all scheduler modes, and included the defines for other
modes (in case someone feels frisky later).
The rest of the story gets a bit weird. The first version of the patch
showed an almost unbelievable performance improvement. Since rebasing my
branch it appears the performance improvement has gone, unfortunately.
But setting these bits seem to be the right thing to do given that the
docs describe corruption that can occur with the default settings.
In summary, I am seeing no more perf improvements (or regressions) in my
limited testing, but we believe this should be set to prevent rendering
corruption, therefore cc stable.
v1: Clear bit 4 also (Ken + Eugeni)
Do a full clear + set of the bits we want (Me).
Cc: Bernard Kilarski <bernard.r.kilarski@intel.com>
Reviewed-by (RFC): Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Ben Widawsky <benjamin.widawsky@intel.com>
Reviewed-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_reg.h | 15 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_display.c | 14 |
2 files changed, 29 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index b05c256d496b..387b2b34e93f 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -537,6 +537,21 @@ #define GEN6_BSD_RNCID 0x12198 +#define GEN7_FF_THREAD_MODE 0x20a0 +#define GEN7_FF_SCHED_MASK 0x0077070 +#define GEN7_FF_TS_SCHED_HS1 (0x5<<16) +#define GEN7_FF_TS_SCHED_HS0 (0x3<<16) +#define GEN7_FF_TS_SCHED_LOAD_BALANCE (0x1<<16) +#define GEN7_FF_TS_SCHED_HW (0x0<<16) /* Default */ +#define GEN7_FF_VS_SCHED_HS1 (0x5<<12) +#define GEN7_FF_VS_SCHED_HS0 (0x3<<12) +#define GEN7_FF_VS_SCHED_LOAD_BALANCE (0x1<<12) /* Default */ +#define GEN7_FF_VS_SCHED_HW (0x0<<12) +#define GEN7_FF_DS_SCHED_HS1 (0x5<<4) +#define GEN7_FF_DS_SCHED_HS0 (0x3<<4) +#define GEN7_FF_DS_SCHED_LOAD_BALANCE (0x1<<4) /* Default */ +#define GEN7_FF_DS_SCHED_HW (0x0<<4) + /* * Framebuffer compression (915+ only) */ diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index f150a15279ea..a040ca0ae20c 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -7451,6 +7451,18 @@ static void gen6_init_clock_gating(struct drm_device *dev) DISPPLANE_TRICKLE_FEED_DISABLE); } +static void gen7_setup_fixed_func_scheduler(struct drm_i915_private *dev_priv) +{ + uint32_t reg = I915_READ(GEN7_FF_THREAD_MODE); + + reg &= ~GEN7_FF_SCHED_MASK; + reg |= GEN7_FF_TS_SCHED_HW; + reg |= GEN7_FF_VS_SCHED_HW; + reg |= GEN7_FF_DS_SCHED_HW; + + I915_WRITE(GEN7_FF_THREAD_MODE, reg); +} + static void ivybridge_init_clock_gating(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; @@ -7597,6 +7609,8 @@ static void ironlake_teardown_rc6(struct drm_device *dev) drm_gem_object_unreference(&dev_priv->pwrctx->base); dev_priv->pwrctx = NULL; } + + gen7_setup_fixed_func_scheduler(dev_priv); } static void ironlake_disable_rc6(struct drm_device *dev) |