drm/i915: Mask reserved bits in display/sprite address registers
The purpose of this patch is to avoid zeroing the lower 12 reserved bits
of surface base address registers (framebuffer & sprite). There are bits
in that range that may occasionally be set by BIOS or by other components.
Signed-off-by: Armin Reese <armin.c.reese@intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 02e9932..eb7ebf4 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2236,7 +2236,7 @@
Start, Offset, x, y, fb->pitches[0]);
I915_WRITE(DSPSTRIDE(plane), fb->pitches[0]);
if (INTEL_INFO(dev)->gen >= 4) {
- I915_WRITE(DSPSURF(plane), Start);
+ I915_MODIFY_DISPBASE(DSPSURF(plane), Start);
I915_WRITE(DSPTILEOFF(plane), (y << 16) | x);
I915_WRITE(DSPADDR(plane), Offset);
} else
@@ -2316,7 +2316,7 @@
DRM_DEBUG_KMS("Writing base %08lX %08lX %d %d %d\n",
Start, Offset, x, y, fb->pitches[0]);
I915_WRITE(DSPSTRIDE(plane), fb->pitches[0]);
- I915_WRITE(DSPSURF(plane), Start);
+ I915_MODIFY_DISPBASE(DSPSURF(plane), Start);
I915_WRITE(DSPTILEOFF(plane), (y << 16) | x);
I915_WRITE(DSPADDR(plane), Offset);
POSTING_READ(reg);