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drm/i915/sprite: Avoid incurring extra vblank stall when updating plane on IVB 

IvyBridge requires an extra frame between disabling the low power
watermarks and enabling scaling on the sprite plane. If the scaling
is already enabled, then we have already disabled the low power
watermarks and need not incur an extra wait.

Similarly, as we disable the scaling when turning off the sprite plane,
we can update the scaling enabled flag and restore the low power
watermarks.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2012-04-18 17:12:26 +01:00 committed by Daniel Vetter
parent 083f9560cd
commit 828ed3e170
1 changed files with 13 additions and 6 deletions
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19
drivers/gpu/drm/i915/intel_sprite.c
View File

@ -110,14 +110,18 @@ ivb_update_plane(struct drm_plane *plane, struct drm_framebuffer *fb,
* when scaling is disabled.
*/
if (crtc_w != src_w || crtc_h != src_h) {
dev_priv->sprite_scaling_enabled = true;
intel_update_watermarks(dev);
intel_wait_for_vblank(dev, pipe);
if (!dev_priv->sprite_scaling_enabled) {
dev_priv->sprite_scaling_enabled = true;
intel_update_watermarks(dev);
intel_wait_for_vblank(dev, pipe);
}
sprscale = SPRITE_SCALE_ENABLE | (src_w << 16) | src_h;
} else {
dev_priv->sprite_scaling_enabled = false;
/* potentially re-enable LP watermarks */
intel_update_watermarks(dev);
if (dev_priv->sprite_scaling_enabled) {
dev_priv->sprite_scaling_enabled = false;
/* potentially re-enable LP watermarks */
intel_update_watermarks(dev);
}
}
I915_WRITE(SPRSTRIDE(pipe), fb->pitches[0]);
@ -151,6 +155,9 @@ ivb_disable_plane(struct drm_plane *plane)
/* Activate double buffered register update */
I915_MODIFY_DISPBASE(SPRSURF(pipe), 0);
POSTING_READ(SPRSURF(pipe));
dev_priv->sprite_scaling_enabled = false;
intel_update_watermarks(dev);
}
static int