From: Thierry Reding <treding@xxxxxxxxxx>
DMA descriptors used with SDHCI have a 16-bit field that specifies the
number of bytes to transfer per segment. A segment's size may therefore
never exceed 64 KiB.
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
drivers/mmc/host/sdhci.c | 5 +++++
drivers/mmc/host/sdhci.h | 1 +
2 files changed, 6 insertions(+)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index d814dc004bad..b59d063646bf 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -3555,6 +3555,10 @@ struct sdhci_host *sdhci_alloc_host(struct device *dev,
*/
host->adma_table_cnt = SDHCI_MAX_SEGS * 2 + 1;
+ /* ADMA supports a maximum of 64 KiB per descriptor */
+ dev->dma_parms = &host->dma_params;
+ dma_set_max_seg_size(dev, SZ_64K);
+
return host;
}
@@ -4410,6 +4414,7 @@ EXPORT_SYMBOL_GPL(sdhci_remove_host);
void sdhci_free_host(struct sdhci_host *host)
{
+ host->mmc->parent->dma_parms = NULL;
mmc_free_host(host->mmc);
}
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index cf3d1ed91909..b543d31bbcdb 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -494,6 +494,7 @@ struct sdhci_host {
/* Internal data */
struct mmc_host *mmc; /* MMC structure */
struct mmc_host_ops mmc_host_ops; /* MMC host ops */
+ struct device_dma_parameters dma_params; /* DMA parameters */
u64 dma_mask; /* custom DMA mask */
#if IS_ENABLED(CONFIG_LEDS_CLASS)
--
2.23.0
