From: Sahitya Tummala Date: Wed, 8 Dec 2010 09:33:06 +0000 (+0530) Subject: mmc: msm_sdcc: Fix bug in PIO mode when data size is not word aligned X-Git-Tag: v2.6.38-rc1~473^2~1^2~1 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=71dd9106af54de0f758875fa4b595af42a327448;p=linux.git 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 Signed-off-by: David Brown --- diff --git a/drivers/mmc/host/msm_sdcc.c b/drivers/mmc/host/msm_sdcc.c index 81ed16fb42b5..9badc51bc4db 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;