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drm/i915: Apply display workaround required according to the B-Spec.

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Not known to fix any current bugs.

Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Eric Anholt 2010-11-06 14:53:33 -07:00 committed by Chris Wilson
parent de6e2eaf2c
commit 67e92af01c
2 changed files with 6 additions and 0 deletions
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2
drivers/gpu/drm/i915/i915_reg.h
View file

@ -2609,6 +2609,8 @@
#define GTIER 0x4401c
#define ILK_DISPLAY_CHICKEN2 0x42004
/* Required on all Ironlake and Sandybridge according to the B-Spec. */
#define ILK_ELPIN_409_SELECT (1 << 25)
#define ILK_DPARB_GATE (1<<22)
#define ILK_VSDPFD_FULL (1<<21)
#define ILK_DSPCLK_GATE 0x42020

4
drivers/gpu/drm/i915/intel_display.c
View file

@ -5819,6 +5819,10 @@ void intel_init_clock_gating(struct drm_device *dev)
ILK_CLK_FBC);
}
I915_WRITE(ILK_DISPLAY_CHICKEN2,
I915_READ(ILK_DISPLAY_CHICKEN2) |
ILK_ELPIN_409_SELECT);
if (IS_GEN5(dev)) {
I915_WRITE(_3D_CHICKEN2,
_3D_CHICKEN2_WM_READ_PIPELINED << 16 |