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authorSahitya Tummala <stummala@codeaurora.org>2010-12-08 15:03:06 +0530
committerDavid Brown <davidb@codeaurora.org>2010-12-20 12:28:31 -0800
commit71dd9106af54de0f758875fa4b595af42a327448 (patch)
treec695aa16ad30d59cb04a0f3dd7073a0a196df957 /drivers/mmc
parentb08bb35d1a5ee5426198eb3a2861008c2e9e6fc4 (diff)
mmc: msm_sdcc: Fix bug in PIO mode when data size is not word aligned
The current code for PIO doesn't transfer whole data when data size is not in multiple of 4 bytes. The last few bytes are not written to the card resulting in no DATAEND interrupt from SDCC. This patch allows data transfer for non-aligned data size in PIO mode. Signed-off-by: Sahitya Tummala <stummala@codeaurora.org> Signed-off-by: David Brown <davidb@codeaurora.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/msm_sdcc.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/mmc/host/msm_sdcc.c b/drivers/mmc/host/msm_sdcc.c
index 81ed16fb42b..9badc51bc4d 100644
--- a/drivers/mmc/host/msm_sdcc.c
+++ b/drivers/mmc/host/msm_sdcc.c
@@ -613,6 +613,9 @@ msmsdcc_pio_read(struct msmsdcc_host *host, char *buffer, unsigned int remain)
uint32_t *ptr = (uint32_t *) buffer;
int count = 0;
+ if (remain % 4)
+ remain = ((remain >> 2) + 1) << 2;
+
while (msmsdcc_readl(host, MMCISTATUS) & MCI_RXDATAAVLBL) {
*ptr = msmsdcc_readl(host, MMCIFIFO + (count % MCI_FIFOSIZE));
ptr++;
@@ -633,13 +636,14 @@ msmsdcc_pio_write(struct msmsdcc_host *host, char *buffer,
char *ptr = buffer;
do {
- unsigned int count, maxcnt;
+ unsigned int count, maxcnt, sz;
maxcnt = status & MCI_TXFIFOEMPTY ? MCI_FIFOSIZE :
MCI_FIFOHALFSIZE;
count = min(remain, maxcnt);
- writesl(base + MMCIFIFO, ptr, count >> 2);
+ sz = count % 4 ? (count >> 2) + 1 : (count >> 2);
+ writesl(base + MMCIFIFO, ptr, sz);
ptr += count;
remain -= count;