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drm/i915: add Ironlake clock gating workaround for FDI link training 

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Jesse Barnes 2010-10-07 16:01:15 -07:00 committed by Chris Wilson
parent 9f0e7ff4b3
commit 5b2adf8971
2 changed files with 9 additions and 0 deletions
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1
drivers/gpu/drm/i915/i915_reg.h
View File

@ -2782,6 +2782,7 @@
#define FDI_RXA_CHICKEN 0xc200c
#define FDI_RXB_CHICKEN 0xc2010
#define FDI_RX_PHASE_SYNC_POINTER_ENABLE (1)
#define FDI_RX_CHICKEN(pipe) _PIPE(pipe, FDI_RXA_CHICKEN, FDI_RXB_CHICKEN)
/* CPU: FDI_TX */
#define FDI_TXA_CTL 0x60100

8
drivers/gpu/drm/i915/intel_display.c
View File

@ -1714,6 +1714,9 @@ static void ironlake_fdi_link_train(struct drm_crtc *crtc)
POSTING_READ(reg);
udelay(150);
/* Ironlake workaround, enable clock pointer after FDI enable*/
I915_WRITE(FDI_RX_CHICKEN(pipe), FDI_RX_PHASE_SYNC_POINTER_ENABLE);
reg = FDI_RX_IIR(pipe);
for (tries = 0; tries < 5; tries++) {
temp = I915_READ(reg);
@ -2192,6 +2195,11 @@ static void ironlake_crtc_disable(struct drm_crtc *crtc)
POSTING_READ(reg);
udelay(100);
/* Ironlake workaround, disable clock pointer after downing FDI */
I915_WRITE(FDI_RX_CHICKEN(pipe),
I915_READ(FDI_RX_CHICKEN(pipe) &
~FDI_RX_PHASE_SYNC_POINTER_ENABLE));
/* still set train pattern 1 */
reg = FDI_TX_CTL(pipe);
temp = I915_READ(reg);