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ARM: pxafb: don't disable controller on cpufreq transition if overlay in use 

It's not safe to disable controller if overlay(s) is enabled (results in
system hang). So we avoid to disable controller in this case. Userspace
should choose proper governor to avoid freq changing when overlay is in
use, otherwise LCD may blink.

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
This commit is contained in:
Vasily Khoruzhick 2011-03-11 11:20:50 +02:00 committed by Eric Miao
parent dcf8eee94f
commit 27be9a9e37
1 changed files with 2 additions and 1 deletions
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3
drivers/video/pxafb.c
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@ -1648,7 +1648,8 @@ pxafb_freq_transition(struct notifier_block *nb, unsigned long val, void *data)
switch (val) {
case CPUFREQ_PRECHANGE:
set_ctrlr_state(fbi, C_DISABLE_CLKCHANGE);
if (!fbi->overlay[0].usage && !fbi->overlay[1].usage)
set_ctrlr_state(fbi, C_DISABLE_CLKCHANGE);
break;
case CPUFREQ_POSTCHANGE: