dmaengine: fsl-edma: Add judgment on enabling round robin arbitration

[ Upstream commit 3448397a47c08c291c3fccb7ac5f0f429fd547e0 ]

Add judgment on enabling round robin arbitration to avoid
exceptions if this function is not supported.

Call trace:
 fsl_edma_resume_early+0x1d4/0x208
 dpm_run_callback+0xd4/0x304
 device_resume_early+0xb0/0x208
 dpm_resume_early+0x224/0x528
 suspend_devices_and_enter+0x3e4/0xd00
 pm_suspend+0x3c4/0x910
 state_store+0x90/0x124
 kobj_attr_store+0x48/0x64
 sysfs_kf_write+0x84/0xb4
 kernfs_fop_write_iter+0x19c/0x264
 vfs_write+0x664/0x858
 ksys_write+0xc8/0x180
 __arm64_sys_write+0x44/0x58
 invoke_syscall+0x5c/0x178
 el0_svc_common.constprop.0+0x11c/0x14c
 do_el0_svc+0x30/0x40
 el0_svc+0x58/0xa8
 el0t_64_sync_handler+0xc0/0xc4
 el0t_64_sync+0x190/0x194

Fixes: 72f5801a4e2b ("dmaengine: fsl-edma: integrate v3 support")
Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20231113225713.1892643-3-xiaolei.wang@windriver.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/dma/fsl-edma-main.c b/drivers/dma/fsl-edma-main.c
index 242a70c..db6cd84 100644 (file)
--- a/drivers/dma/fsl-edma-main.c
+++ b/drivers/dma/fsl-edma-main.c
@@ -674,7 +674,8 @@ static int fsl_edma_resume_early(struct device *dev)
                        fsl_edma_chan_mux(fsl_chan, fsl_chan->slave_id, true);
        }
 
-       edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, regs->cr);
+       if (!(fsl_edma->drvdata->flags & FSL_EDMA_DRV_SPLIT_REG))
+               edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, regs->cr);
 
        return 0;
 }