leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

ARM: 7230/1: mmc: mmci: Fix PIO read for small SDIO packets

Browse Source 
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.nilsson@stericsson.com>
Signed-off-by: Ulf Hansson <ulf.hansson@stericsson.com>
Signed-off-by: Fredrik Soderstedt <fredrik.soderstedt@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Ulf Hansson 2011-12-13 17:08:04 +01:00 committed by Russell King
parent 7258db7efe
commit 393e5e2416
1 changed files with 18 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/mmc/host/mmci.c
View File

@ -794,7 +794,24 @@ 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 always read the last bytes
* while only doing full 32-bit reads towards the FIFO.
*/
if (unlikely(count & 0x3)) {
if (count < 4) {
unsigned char buf[4];
readsl(base + MMCIFIFO, buf, 1);
memcpy(ptr, buf, count);
} else {
readsl(base + MMCIFIFO, ptr, count >> 2);
count &= ~0x3;
}
} else {
readsl(base + MMCIFIFO, ptr, count >> 2);
}
ptr += count;
remain -= count;