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| author | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-08-17 13:31:43 -0700 |
|---|---|---|
| committer | Eric Anholt <eric@anholt.net> | 2009-09-04 13:05:38 -0700 |
| commit | 652c393a3368af84359da37c45afc35a91144960 (patch) | |
| tree | 35f76866301f0ee61819d6265068ca548d119c0e /drivers/gpu/drm/i915/intel_i2c.c | |
| parent | 043029655816ed4cfc2ed247020ef97e5d637392 (diff) | |
| download | kernel_samsung_smdk4412-652c393a3368af84359da37c45afc35a91144960.zip kernel_samsung_smdk4412-652c393a3368af84359da37c45afc35a91144960.tar.gz kernel_samsung_smdk4412-652c393a3368af84359da37c45afc35a91144960.tar.bz2 | |
drm/i915: add dynamic clock frequency control
There are several sources of unnecessary power consumption on Intel
graphics systems. The first is the LVDS clock. TFTs don't suffer from
persistence issues like CRTs, and so we can reduce the LVDS refresh rate
when the screen is idle. It will be automatically upclocked when
userspace triggers graphical activity. Beyond that, we can enable memory
self refresh. This allows the memory to go into a lower power state when
the graphics are idle. Finally, we can drop some clocks on the gpu
itself. All of these things can be reenabled between frames when GPU
activity is triggered, and so there should be no user visible graphical
changes.
Signed-off-by: Jesse Barnes <jesse.barnes@intel.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_i2c.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_i2c.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c index 62b8bea..c7eab72 100644 --- a/drivers/gpu/drm/i915/intel_i2c.c +++ b/drivers/gpu/drm/i915/intel_i2c.c @@ -42,11 +42,11 @@ void intel_i2c_quirk_set(struct drm_device *dev, bool enable) if (!IS_IGD(dev)) return; if (enable) - I915_WRITE(CG_2D_DIS, - I915_READ(CG_2D_DIS) | DPCUNIT_CLOCK_GATE_DISABLE); + I915_WRITE(DSPCLK_GATE_D, + I915_READ(DSPCLK_GATE_D) | DPCUNIT_CLOCK_GATE_DISABLE); else - I915_WRITE(CG_2D_DIS, - I915_READ(CG_2D_DIS) & (~DPCUNIT_CLOCK_GATE_DISABLE)); + I915_WRITE(DSPCLK_GATE_D, + I915_READ(DSPCLK_GATE_D) & (~DPCUNIT_CLOCK_GATE_DISABLE)); } /* |