On 16/05/20 1:27 am, Angelo Dureghello wrote:
Some controller as the ColdFire eshdc may require an endianness
byte swap, becouse DMA read endianness is not configurable.
becouse -> because
Needs a bit more explanation i.e.
Facilitate using the bounce buffer for this by adding ->copy_to_bounce_buffer().
Nevertheless:
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Signed-off-by: Angelo Dureghello <angelo.dureghello@xxxxxxxxxxx>
---
Changes for v3:
- add post request callback
Changes for v4:
none
Changes for v5:
- remove useless comment before swapping bounce buffer
- rename pre_dma_transfer to copy_to_bounce_buffer
---
drivers/mmc/host/sdhci.c | 9 ++++++---
drivers/mmc/host/sdhci.h | 2 ++
2 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 3f716466fcfd..b7ba43e3b7c5 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -634,9 +634,12 @@ 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);
+ } 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..632ea297bb60 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -653,6 +653,8 @@ 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);
void (*request_done)(struct sdhci_host *host,
struct mmc_request *mrq);
};
