DISP_REG_MUTEX_EN
writel(0, mtx->regs + DISP_REG_MUTEX_EN(mutex->id));
writel(1, mtx->regs + DISP_REG_MUTEX_EN(mutex->id));
writel(1, mtx->regs + DISP_REG_MUTEX_EN(mutex->id));
dma_addr_t en_addr = mtx->addr + DISP_REG_MUTEX_EN(mutex->id);