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drm/i915: try not to lose backlight CBLV precision
[pandora-kernel.git]
/
drivers
/
gpu
/
drm
/
i915
/
intel_opregion.c
diff --git
a/drivers/gpu/drm/i915/intel_opregion.c
b/drivers/gpu/drm/i915/intel_opregion.c
index
cfb8fb6
..
119771f
100644
(file)
--- a/
drivers/gpu/drm/i915/intel_opregion.c
+++ b/
drivers/gpu/drm/i915/intel_opregion.c
@@
-173,7
+173,7
@@
static u32 asle_set_backlight(struct drm_device *dev, u32 bclp)
return ASLE_BACKLIGHT_FAILED;
intel_panel_set_backlight(dev, bclp, 255);
- iowrite32(
(bclp*0x64)/0xff
| ASLE_CBLV_VALID, &asle->cblv);
+ iowrite32(
DIV_ROUND_UP(bclp * 100, 255)
| ASLE_CBLV_VALID, &asle->cblv);
return 0;
}