diff options
| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2019-10-03 17:02:31 +0300 |
|---|---|---|
| committer | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2019-10-04 18:43:49 +0300 |
| commit | 7d423af9bfb172c3802cc1ca6591ac608c26a311 (patch) | |
| tree | a033751e6a98098bd8e6236fc150e2e0a3a2371a /drivers/gpu/drm/i915/i915_irq.h | |
| parent | 7842793330ce96ac1d20d22901fb4009c21676f2 (diff) | |
| download | linux-7d423af9bfb172c3802cc1ca6591ac608c26a311.tar.xz | |
drm/i915: Implement a better i945gm vblank irq vs. C-states workaround
The current "disable C3+" workaround for the delayed vblank
irqs on i945gm no longer works. I'm not sure what changed, but
now I need to also disable C2. I also got my hands on a i915gm
machine that suffers from the same issue.
After some furious poking of registers I managed to find a
better workaround: The "Do not Turn off Core Render Clock in C
states" bit. With that I no longer have to disable any C-states,
and as a nice bonus the power cost is only ~1/4 of the
"disable C3+" method (which mind you doesn't even work anymore,
and so would have an even higher power cost if we made it work
by also disabling C2).
So let's throw out all the cpuidle/qos crap and just toggle
the magic bit as needed. And we extend the workaround to cover
i915gm as well.
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191003140231.24408-1-ville.syrjala@linux.intel.com
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_irq.h')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_irq.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/i915_irq.h b/drivers/gpu/drm/i915/i915_irq.h index 8e7e6071777e..19a3bc019535 100644 --- a/drivers/gpu/drm/i915/i915_irq.h +++ b/drivers/gpu/drm/i915/i915_irq.h @@ -122,12 +122,12 @@ u32 i915_get_vblank_counter(struct drm_crtc *crtc); u32 g4x_get_vblank_counter(struct drm_crtc *crtc); int i8xx_enable_vblank(struct drm_crtc *crtc); -int i945gm_enable_vblank(struct drm_crtc *crtc); +int i915gm_enable_vblank(struct drm_crtc *crtc); int i965_enable_vblank(struct drm_crtc *crtc); int ilk_enable_vblank(struct drm_crtc *crtc); int bdw_enable_vblank(struct drm_crtc *crtc); void i8xx_disable_vblank(struct drm_crtc *crtc); -void i945gm_disable_vblank(struct drm_crtc *crtc); +void i915gm_disable_vblank(struct drm_crtc *crtc); void i965_disable_vblank(struct drm_crtc *crtc); void ilk_disable_vblank(struct drm_crtc *crtc); void bdw_disable_vblank(struct drm_crtc *crtc); |