diff options
| author | Alan Cox <alan@linux.intel.com> | 2012-05-21 15:27:10 +0100 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2012-05-22 10:15:29 +0100 |
| commit | ac0a5dd6ae764ba228ec645920b78c70cee05eb7 (patch) | |
| tree | 38cdd714609bf77435fa5f8ec8cc0433570fb93d /drivers/gpu/drm/gma500 | |
| parent | 3299de9558687ec02b3b9fae1af639844c46ea4b (diff) | |
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>
Diffstat (limited to 'drivers/gpu/drm/gma500')
| -rw-r--r-- | drivers/gpu/drm/gma500/psb_lid.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/gpu/drm/gma500/psb_lid.c b/drivers/gpu/drm/gma500/psb_lid.c index 7ff8bb2bdc2..1d2ebb5e530 100644 --- a/drivers/gpu/drm/gma500/psb_lid.c +++ b/drivers/gpu/drm/gma500/psb_lid.c @@ -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); |