The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x 8ddad558997002ce67980e30c9e8dfaa696e163b # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024072928-engaged-steerable-531f@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..

Possible dependencies:

8ddad5589970 ("dmaengine: fsl-edma: change the memory access from local into remote mode in i.MX 8QM") 77584368a0f3 ("dmaengine: fsl-edma: clean up unused "fsl,imx8qm-adma" compatible string") d8d4355861d8 ("dmaengine: fsl-edma: add i.MX8ULP edma support") 4ee632c82d2d ("dmaengine: fsl-edma: fix DMA channel leak in eDMAv4")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 8ddad558997002ce67980e30c9e8dfaa696e163b Mon Sep 17 00:00:00 2001 From: Joy Zou joy.zou@nxp.com Date: Fri, 10 May 2024 11:09:34 +0800 Subject: [PATCH] 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

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); } diff --git a/drivers/dma/fsl-edma-common.h b/drivers/dma/fsl-edma-common.h index 1c90b95f4ff8..ce37e1ee9c46 100644 --- a/drivers/dma/fsl-edma-common.h +++ b/drivers/dma/fsl-edma-common.h @@ -194,6 +194,7 @@ struct fsl_edma_desc { #define FSL_EDMA_DRV_HAS_PD BIT(5) #define FSL_EDMA_DRV_HAS_CHCLK BIT(6) #define FSL_EDMA_DRV_HAS_CHMUX BIT(7) +#define FSL_EDMA_DRV_MEM_REMOTE BIT(8) /* control and status register is in tcd address space, edma3 reg layout */ #define FSL_EDMA_DRV_SPLIT_REG BIT(9) #define FSL_EDMA_DRV_BUS_8BYTE BIT(10) diff --git a/drivers/dma/fsl-edma-main.c b/drivers/dma/fsl-edma-main.c index ec4f5baafad5..c66185c5a199 100644 --- a/drivers/dma/fsl-edma-main.c +++ b/drivers/dma/fsl-edma-main.c @@ -343,7 +343,7 @@ static struct fsl_edma_drvdata imx7ulp_data = { };

static struct fsl_edma_drvdata imx8qm_data = { - .flags = FSL_EDMA_DRV_HAS_PD | FSL_EDMA_DRV_EDMA3, + .flags = FSL_EDMA_DRV_HAS_PD | FSL_EDMA_DRV_EDMA3 | FSL_EDMA_DRV_MEM_REMOTE, .chreg_space_sz = 0x10000, .chreg_off = 0x10000, .setup_irq = fsl_edma3_irq_init,