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gma500: Prevent endless loop in panel power up sequence 

Some devices don't have a panel connected to LVDS and thus will never power up.
This patch checks the power sequence progress bits in PP_STATUS to prevent an
endless loop on such devices.

Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Alan Cox 2012-05-21 15:27:10 +01:00 committed by Dave Airlie
parent 3299de9558
commit ac0a5dd6ae
1 changed files with 9 additions and 3 deletions
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12
drivers/gpu/drm/gma500/psb_lid.c
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@ -40,10 +40,16 @@ static void psb_lid_timer_func(unsigned long data)
REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) | POWER_TARGET_ON);
do {
pp_status = REG_READ(PP_STATUS);
} while ((pp_status & PP_ON) == 0);
} while ((pp_status & PP_ON) == 0 &&
(pp_status & PP_SEQUENCE_MASK) != 0);
/*FIXME: should be backlight level before*/
psb_intel_lvds_set_brightness(dev, 100);
if (REG_READ(PP_STATUS) & PP_ON) {
/*FIXME: should be backlight level before*/
psb_intel_lvds_set_brightness(dev, 100);
} else {
DRM_DEBUG("LVDS panel never powered up");
return;
}
} else {
psb_intel_lvds_set_brightness(dev, 0);