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drm/i915: add PANEL_UNLOCK_REGS definition 

In some cases, unlocking the panel regs is safe and can help us avoid a
flickery, full mode set sequence.  So define the unlock key and use it.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Jesse Barnes 2010-07-22 13:18:18 -07:00 committed by Eric Anholt
parent 6ba770dc5c
commit 4a655f0431
2 changed files with 5 additions and 2 deletions
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1
drivers/gpu/drm/i915/i915_reg.h
View File

@ -2805,6 +2805,7 @@
#define PCH_PP_STATUS 0xc7200
#define PCH_PP_CONTROL 0xc7204
#define PANEL_UNLOCK_REGS (0xabcd << 16)
#define EDP_FORCE_VDD (1 << 3)
#define EDP_BLC_ENABLE (1 << 2)
#define PANEL_POWER_RESET (1 << 1)

6
drivers/gpu/drm/i915/intel_display.c
View File

@ -4413,7 +4413,8 @@ static void intel_increase_pllclock(struct drm_crtc *crtc, bool schedule)
DRM_DEBUG_DRIVER("upclocking LVDS\n");
/* Unlock panel regs */
I915_WRITE(PP_CONTROL, I915_READ(PP_CONTROL) | (0xabcd << 16));
I915_WRITE(PP_CONTROL, I915_READ(PP_CONTROL) |
PANEL_UNLOCK_REGS);
dpll &= ~DISPLAY_RATE_SELECT_FPA1;
I915_WRITE(dpll_reg, dpll);
@ -4456,7 +4457,8 @@ static void intel_decrease_pllclock(struct drm_crtc *crtc)
DRM_DEBUG_DRIVER("downclocking LVDS\n");
/* Unlock panel regs */
I915_WRITE(PP_CONTROL, I915_READ(PP_CONTROL) | (0xabcd << 16));
I915_WRITE(PP_CONTROL, I915_READ(PP_CONTROL) |
PANEL_UNLOCK_REGS);
dpll |= DISPLAY_RATE_SELECT_FPA1;
I915_WRITE(dpll_reg, dpll);