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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>
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@ -1648,7 +1648,8 @@ pxafb_freq_transition(struct notifier_block *nb, unsigned long val, void *data)
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switch (val) {
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case CPUFREQ_PRECHANGE:
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set_ctrlr_state(fbi, C_DISABLE_CLKCHANGE);
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if (!fbi->overlay[0].usage && !fbi->overlay[1].usage)
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set_ctrlr_state(fbi, C_DISABLE_CLKCHANGE);
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break;
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case CPUFREQ_POSTCHANGE:
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