Corrects a bug in MMCI host driver which silently causes
small reads (< 4 bytes as only used in SDIO) from PL-18X to fail.
Signed-off-by: Stefan Nilsson XK <stefan.xk.nils...@stericsson.com>
Signed-off-by: Ulf Hansson <ulf.hans...@stericsson.com>
Acked-by: Linus Walleij <linus.wall...@linaro.org>
---
drivers/mmc/host/mmci.c | 13 ++++++++++++-
1 files changed, 12 insertions(+), 1 deletions(-)
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 56e9a41..5c3a517 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -776,7 +776,18 @@ static int mmci_pio_read(struct mmci_host *host, char
*buffer, unsigned int rema
if (count <= 0)
break;
- readsl(base + MMCIFIFO, ptr, count >> 2);
+ /*
+ * SDIO especially may want to send something that is
+ * not divisible by 4 (as opposed to card sectors
+ * etc). Therefore make sure to to always read the last bytes
+ * while only doing full 32-bit reads towards the FIFO.
+ */
+ if (count < 4) {
+ unsigned char buf[4];
+ readsl(base + MMCIFIFO, buf, 1);
+ memcpy(ptr, buf, count);
+ } else
+ readsl(base + MMCIFIFO, ptr, count >> 2);
ptr += count;
remain -= count;
--
1.7.7
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