drm/i915: Flush using only the correct base address register
We were writing DSP_ADDR and DSP_SURF unconditionally. This did not
trigger an unclaimed write before HSW as the address of DSP_ADDR has
been repurposed as DSP_LINOFF.
On HSW, though, DSP_LINOFF has been removed and then writting to it
triggers an unclaimed write.
This patch writes to DSP_ADDR or DSP_SURF to flush the display plane
configuration depending on the gen we're running on.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
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 1096066..fe2bb77 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1836,8 +1836,10 @@
void intel_flush_display_plane(struct drm_i915_private *dev_priv,
enum plane plane)
{
- I915_WRITE(DSPADDR(plane), I915_READ(DSPADDR(plane)));
- I915_WRITE(DSPSURF(plane), I915_READ(DSPSURF(plane)));
+ if (dev_priv->info->gen >= 4)
+ I915_WRITE(DSPSURF(plane), I915_READ(DSPSURF(plane)));
+ else
+ I915_WRITE(DSPADDR(plane), I915_READ(DSPADDR(plane)));
}
/**