Commits
Liu Ying committed b0b1cfbdee2
ENGR00227681 IPUv3:Use spinlock to protect buf ready reg There are several channels' buffer ready bits controlled by a single 32bit register-IPU_CHA_BUFx_RDY. These buffer ready can be write-one-to-set or write-one-to-clear, which is controlled by IPU_GPR register. v4l2 capture driver will touch the buffer ready registers in interrupt context, so, currently, ipu->mutex_lock is bypassed with the context. Then, a race condition is that v4l2 capture driver interrupt context tries to set a channel buffer ready, while, another context tries to disable another channel(clear buffer ready bit), which may cause v4l2 capture driver fails to set buffer ready(SMFC0_FRM_LOST error may happen). This patch uses ipu-> rdy_reg_spin_lock to protect buffer ready registers to fix the race condition issue and rename ipu->spin_lock to ipu-> int_reg_spin_lock. Signed-off-by: Liu Ying <Ying.Liu@freescale.com> (cherry picked from commit d3515529a4be205809356961e58afa660781547b)