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path: root/drivers/mmc/host/pxamci.c
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Diffstat (limited to 'drivers/mmc/host/pxamci.c')
-rw-r--r--drivers/mmc/host/pxamci.c22
1 files changed, 19 insertions, 3 deletions
diff --git a/drivers/mmc/host/pxamci.c b/drivers/mmc/host/pxamci.c
index 65210fca37e..d39f5973886 100644
--- a/drivers/mmc/host/pxamci.c
+++ b/drivers/mmc/host/pxamci.c
@@ -114,6 +114,7 @@ static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
unsigned int nob = data->blocks;
unsigned long long clks;
unsigned int timeout;
+ bool dalgn = 0;
u32 dcmd;
int i;
@@ -152,6 +153,9 @@ static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
host->sg_cpu[i].dcmd = dcmd | length;
if (length & 31 && !(data->flags & MMC_DATA_READ))
host->sg_cpu[i].dcmd |= DCMD_ENDIRQEN;
+ /* Not aligned to 8-byte boundary? */
+ if (sg_dma_address(&data->sg[i]) & 0x7)
+ dalgn = 1;
if (data->flags & MMC_DATA_READ) {
host->sg_cpu[i].dsadr = host->res->start + MMC_RXFIFO;
host->sg_cpu[i].dtadr = sg_dma_address(&data->sg[i]);
@@ -165,6 +169,15 @@ static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
host->sg_cpu[host->dma_len - 1].ddadr = DDADR_STOP;
wmb();
+ /*
+ * The PXA27x DMA controller encounters overhead when working with
+ * unaligned (to 8-byte boundaries) data, so switch on byte alignment
+ * mode only if we have unaligned data.
+ */
+ if (dalgn)
+ DALGN |= (1 << host->dma);
+ else
+ DALGN &= (1 << host->dma);
DDADR(host->dma) = host->sg_dma;
DCSR(host->dma) = DCSR_RUN;
}
@@ -361,9 +374,12 @@ static int pxamci_get_ro(struct mmc_host *mmc)
struct pxamci_host *host = mmc_priv(mmc);
if (host->pdata && host->pdata->get_ro)
- return host->pdata->get_ro(mmc_dev(mmc));
- /* Host doesn't support read only detection so assume writeable */
- return 0;
+ return !!host->pdata->get_ro(mmc_dev(mmc));
+ /*
+ * Board doesn't support read only detection; let the mmc core
+ * decide what to do.
+ */
+ return -ENOSYS;
}
static void pxamci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)