diff options
| author | Joy Zou <joy.zou@nxp.com> | 2024-05-10 06:09:34 +0300 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2024-06-11 21:25:34 +0300 |
| commit | 8ddad558997002ce67980e30c9e8dfaa696e163b (patch) | |
| tree | 648ec6ec5e082d8faaee40e94cbdc1a4cc1eabb1 /drivers/dma/fsl-edma-common.c | |
| parent | 7dcf9e82e0a05cf7b7abccd0ce1b4ca598d70f08 (diff) | |
| download | linux-8ddad558997002ce67980e30c9e8dfaa696e163b.tar.xz | |
dmaengine: fsl-edma: change the memory access from local into remote mode in i.MX 8QM
Fix the issue where MEM_TO_MEM fail on i.MX8QM due to the requirement
that both source and destination addresses need pass through the IOMMU.
Typically, peripheral FIFO addresses bypass the IOMMU, necessitating
only one of the source or destination to go through it.
Set "is_remote" to true to ensure both source and destination
addresses pass through the IOMMU.
iMX8 Spec define "Local" and "Remote" bus as below.
Local bus: bypass IOMMU to directly access other peripheral register,
such as FIFO.
Remote bus: go through IOMMU to access system memory.
The test fail log as follow:
[ 66.268506] dmatest: dma0chan0-copy0: result #1: 'test timed out' with src_off=0x100 dst_off=0x80 len=0x3ec0 (0)
[ 66.278785] dmatest: dma0chan0-copy0: summary 1 tests, 1 failures 0.32 iops 4 KB/s (0)
Fixes: 72f5801a4e2b ("dmaengine: fsl-edma: integrate v3 support")
Signed-off-by: Joy Zou <joy.zou@nxp.com>
Cc: stable@vger.kernel.org
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20240510030959.703663-1-joy.zou@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/fsl-edma-common.c')
| -rw-r--r-- | drivers/dma/fsl-edma-common.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/dma/fsl-edma-common.c b/drivers/dma/fsl-edma-common.c index 9d565ab85502..b7f15ab96855 100644 --- a/drivers/dma/fsl-edma-common.c +++ b/drivers/dma/fsl-edma-common.c @@ -755,6 +755,8 @@ struct dma_async_tx_descriptor *fsl_edma_prep_memcpy(struct dma_chan *chan, fsl_desc->iscyclic = false; fsl_chan->is_sw = true; + if (fsl_edma_drvflags(fsl_chan) & FSL_EDMA_DRV_MEM_REMOTE) + fsl_chan->is_remote = true; /* To match with copy_align and max_seg_size so 1 tcd is enough */ fsl_edma_fill_tcd(fsl_chan, fsl_desc->tcd[0].vtcd, dma_src, dma_dst, @@ -848,6 +850,7 @@ void fsl_edma_free_chan_resources(struct dma_chan *chan) fsl_chan->tcd_pool = NULL; fsl_chan->is_sw = false; fsl_chan->srcid = 0; + fsl_chan->is_remote = false; if (fsl_edma_drvflags(fsl_chan) & FSL_EDMA_DRV_HAS_CHCLK) clk_disable_unprepare(fsl_chan->clk); } |