From: Angelo Dureghello angelo.dureghello@timesys.com
[ Upstream commit e93577ecde8f3cbd12a2eaa0522d5c85e0dbdd53 ]
Some controller as the ColdFire eshdc may require an endianness byte swap, because DMA read endianness is not configurable.
Facilitate using the bounce buffer for this by adding ->copy_to_bounce_buffer().
Signed-off-by: Angelo Dureghello angelo.dureghello@timesys.com Acked-by: Adrian Hunter adrian.hunter@intel.com Link: https://lore.kernel.org/r/20200518191742.1251440-2-angelo.dureghello@timesys... Signed-off-by: Ulf Hansson ulf.hansson@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/mmc/host/sdhci.c | 10 +++++++--- drivers/mmc/host/sdhci.h | 3 +++ 2 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index e368f2dabf20..5dcdda5918cb 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -634,9 +634,13 @@ static int sdhci_pre_dma_transfer(struct sdhci_host *host, } if (mmc_get_dma_dir(data) == DMA_TO_DEVICE) { /* Copy the data to the bounce buffer */ - sg_copy_to_buffer(data->sg, data->sg_len, - host->bounce_buffer, - length); + if (host->ops->copy_to_bounce_buffer) { + host->ops->copy_to_bounce_buffer(host, + data, length); + } else { + sg_copy_to_buffer(data->sg, data->sg_len, + host->bounce_buffer, length); + } } /* Switch ownership to the DMA */ dma_sync_single_for_device(host->mmc->parent, diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index 79dffbb731d3..1bf4f1d91951 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -653,6 +653,9 @@ struct sdhci_ops { void (*voltage_switch)(struct sdhci_host *host); void (*adma_write_desc)(struct sdhci_host *host, void **desc, dma_addr_t addr, int len, unsigned int cmd); + void (*copy_to_bounce_buffer)(struct sdhci_host *host, + struct mmc_data *data, + unsigned int length); void (*request_done)(struct sdhci_host *host, struct mmc_request *mrq); };