Daniel Drake 012a121184
viafb: don't touch clock state on OLPC XO-1.5 ...
As detailed in the thread titled "viafb PLL/clock tweaking causes XO-1.5
instability," enabling or disabling the IGA1/IGA2 clocks causes occasional
stability problems during suspend/resume cycles on this platform.
This is rather odd, as the documentation suggests that clocks have two
states (on/off) and the default (stable) configuration is configured to
enable the clock only when it is needed. However, explicitly enabling *or*
disabling the clock triggers this system instability, suggesting that there
is a 3rd state at play here.
Leaving the clock enable/disable registers alone solves this problem.
This fixes spurious reboots during suspend/resume behaviour introduced by
commit b692a63adsd@laptop.org >
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de >
Cc: stable@vger.kernel.org
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Daniel Drake
012a121184