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drm/i915: Do not clobber the contents of TRANS_DP_CTL when enabling. 

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Chris Wilson 2010-08-04 11:25:21 +01:00 committed by Eric Anholt
parent 3e33d94df7
commit 94113cecae
2 changed files with 5 additions and 3 deletions
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1
drivers/gpu/drm/i915/i915_reg.h
View File

@ -2928,6 +2928,7 @@
#define TRANS_DP_VSYNC_ACTIVE_LOW 0
#define TRANS_DP_HSYNC_ACTIVE_HIGH (1<<3)
#define TRANS_DP_HSYNC_ACTIVE_LOW 0
#define TRANS_DP_SYNC_MASK (3<<3)
/* SNB eDP training params */
/* SNB A-stepping */

7
drivers/gpu/drm/i915/intel_display.c
View File

@ -2097,9 +2097,10 @@ static void ironlake_crtc_dpms(struct drm_crtc *crtc, int mode)
int reg;
reg = I915_READ(trans_dp_ctl);
reg &= ~TRANS_DP_PORT_SEL_MASK;
reg = TRANS_DP_OUTPUT_ENABLE |
TRANS_DP_ENH_FRAMING;
reg &= ~(TRANS_DP_PORT_SEL_MASK |
TRANS_DP_SYNC_MASK);
reg |= (TRANS_DP_OUTPUT_ENABLE |
TRANS_DP_ENH_FRAMING);
if (crtc->mode.flags & DRM_MODE_FLAG_PHSYNC)
reg |= TRANS_DP_HSYNC_ACTIVE_HIGH;