| Message ID | 20200831130720.4524-1-vigneshr@ti.com (mailing list archive) |
|---|---|
| State | Accepted |
| Commit | 83048015ff7710b46e7c489458a93c6fe348229d |
| Headers | show |
| Series | [v2] spi: spi-cadence-quadspi: Fix mapping of buffers for DMA reads | expand |
On Mon, 31 Aug 2020 18:37:20 +0530, Vignesh Raghavendra wrote: > Buffers need to mapped to DMA channel's device pointer instead of SPI > controller's device pointer as its system DMA that actually does data > transfer. > Data inconsistencies have been reported when reading from flash > without this fix. Applied to https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next Thanks! [1/1] spi: spi-cadence-quadspi: Fix mapping of buffers for DMA reads commit: 83048015ff7710b46e7c489458a93c6fe348229d All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted. You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed. If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced. Please add any relevant lists and maintainers to the CCs when replying to this mail. Thanks, Mark
diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c index 508b219eabf8..c6795c684b16 100644 --- a/drivers/spi/spi-cadence-quadspi.c +++ b/drivers/spi/spi-cadence-quadspi.c @@ -907,14 +907,16 @@ static int cqspi_direct_read_execute(struct cqspi_flash_pdata *f_pdata, struct dma_async_tx_descriptor *tx; dma_cookie_t cookie; dma_addr_t dma_dst; + struct device *ddev; if (!cqspi->rx_chan || !virt_addr_valid(buf)) { memcpy_fromio(buf, cqspi->ahb_base + from, len); return 0; } - dma_dst = dma_map_single(dev, buf, len, DMA_FROM_DEVICE); - if (dma_mapping_error(dev, dma_dst)) { + ddev = cqspi->rx_chan->device->dev; + dma_dst = dma_map_single(ddev, buf, len, DMA_FROM_DEVICE); + if (dma_mapping_error(ddev, dma_dst)) { dev_err(dev, "dma mapping failed\n"); return -ENOMEM; } @@ -948,7 +950,7 @@ static int cqspi_direct_read_execute(struct cqspi_flash_pdata *f_pdata, } err_unmap: - dma_unmap_single(dev, dma_dst, len, DMA_FROM_DEVICE); + dma_unmap_single(ddev, dma_dst, len, DMA_FROM_DEVICE); return ret; }
Buffers need to mapped to DMA channel's device pointer instead of SPI controller's device pointer as its system DMA that actually does data transfer. Data inconsistencies have been reported when reading from flash without this fix. Fixes: ffa639e069fb ("mtd: spi-nor: cadence-quadspi: Add DMA support for direct mode reads") Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com> Tested-by: Jan Kiszka <jan.kiszka@siemens.com> --- v2: Update the Fixes tag and add collect tested-by drivers/spi/spi-cadence-quadspi.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)