This patch fixes the black screen bug on Dell e6510:
https://bugs.freedesktop.org/show_bug.cgi?id=29278
It adds two delays to give the eDP panel time to turn on before we
continue with the next write.
--- drivers/gpu/drm/i915/intel_dp.c.orig 2010-09-23 20:13:36.046856913
+0200
+++ drivers/gpu/drm/i915/intel_dp.c 2010-09-23 19:27:00.682282002 +0200
@@ -27,6 +27,7 @@
#include <linux/i2c.h>
#include <linux/slab.h>
+#include <linux/delay.h>
#include "drmP.h"
#include "drm.h"
#include "drm_crtc.h"
@@ -772,6 +773,7 @@ static void ironlake_edp_panel_on (struc
pp |= PANEL_UNLOCK_REGS | POWER_TARGET_ON;
I915_WRITE(PCH_PP_CONTROL, pp);
+ msleep(300);
if (wait_for(I915_READ(PCH_PP_STATUS) & PP_ON, 5000, 10))
DRM_ERROR("panel on wait timed out: 0x%08x\n",
I915_READ(PCH_PP_STATUS));
@@ -805,6 +807,7 @@ static void ironlake_edp_panel_off (stru
pp |= EDP_FORCE_VDD | PANEL_POWER_RESET; /* restore panel reset bit */
I915_WRITE(PCH_PP_CONTROL, pp);
POSTING_READ(PCH_PP_CONTROL);
+ msleep(300);
}
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