5.4-stable review patch. If anyone has any objections, please let me know.
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From: Peng Ma peng.ma@nxp.com
commit 9d739bccf261dd93ec1babf82f5c5d71dd4caa3e upstream.
There is chip (ls1028a) errata:
The SoC may hang on 16 byte unaligned read transactions by QDMA.
Unaligned read transactions initiated by QDMA may stall in the NOC (Network On-Chip), causing a deadlock condition. Stalled transactions will trigger completion timeouts in PCIe controller.
Workaround: Enable prefetch by setting the source descriptor prefetchable bit ( SD[PF] = 1 ).
Implement this workaround.
Cc: stable@vger.kernel.org Fixes: b092529e0aa0 ("dmaengine: fsl-qdma: Add qDMA controller driver for Layerscape SoCs") Signed-off-by: Peng Ma peng.ma@nxp.com Signed-off-by: Frank Li Frank.Li@nxp.com Link: https://lore.kernel.org/r/20240201215007.439503-1-Frank.Li@nxp.com Signed-off-by: Vinod Koul vkoul@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/dma/fsl-qdma.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/dma/fsl-qdma.c +++ b/drivers/dma/fsl-qdma.c @@ -109,6 +109,7 @@ #define FSL_QDMA_CMD_WTHROTL_OFFSET 20 #define FSL_QDMA_CMD_DSEN_OFFSET 19 #define FSL_QDMA_CMD_LWC_OFFSET 16 +#define FSL_QDMA_CMD_PF BIT(17)
/* Field definition for Descriptor offset */ #define QDMA_CCDF_STATUS 20 @@ -372,7 +373,8 @@ static void fsl_qdma_comp_fill_memcpy(st qdma_csgf_set_f(csgf_dest, len); /* Descriptor Buffer */ cmd = cpu_to_le32(FSL_QDMA_CMD_RWTTYPE << - FSL_QDMA_CMD_RWTTYPE_OFFSET); + FSL_QDMA_CMD_RWTTYPE_OFFSET) | + FSL_QDMA_CMD_PF; sdf->data = QDMA_SDDF_CMD(cmd);
cmd = cpu_to_le32(FSL_QDMA_CMD_RWTTYPE <<