linux-wandboard

MGS-2970-2 [#imx-603] fix dual gpu hang with power management

gpu1 hang is reproducible when run es32 cts with power mangement.

there is the gpu1 power-off/up when commit gpu0 and gpu1 early or late,
then gpu0 will break the inter-semaphore & stall from gpu1, and end up,
when gpu1 execute its command, will stuck to wait for gpu0 infinitely.

prevent the unexpected power-off bofore command commit on dual cores.

Date: Jun 18, 2017
Signed-off-by: Xianzhong <xianzhong.li@nxp.com>