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mmc: msm_sdcc: Fix bug in PIO mode when data size is not word aligned

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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>
This commit is contained in:
Sahitya Tummala 2010-12-08 15:03:06 +05:30 committed by David Brown
parent b08bb35d1a
commit 71dd9106af
1 changed files with 6 additions and 2 deletions
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8
drivers/mmc/host/msm_sdcc.c
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@ -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;