From: Alan Cox <alan@xxxxxxxxxxxxxxx>
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@xxxxxxxxx>
Signed-off-by: Alan Cox <alan@xxxxxxxxxxxxxxx>
---
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 7ff8bb2b..1d2ebb5 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);
--
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
