drm/i915: add PANEL_UNLOCK_REGS definition

commit 4a655f043160eeae447efd3be297b6b4c397a640 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 0a86567c88a9567f3aecf92f28e03b94b2989513..eb01ca6132d8ed8eb8cd05630dc53943be7c59ad 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2687,6 +2687,7 @@
 
 #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)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 3ab28a45e865bd00b7e4da405b109d283807c8c4..44c07f87651f4b4eb3a060583a9c7486c70a98fb 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3950,7 +3950,8 @@ 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);
@@ -3993,7 +3994,8 @@ 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);