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Commit 71dd9106 authored by Sahitya Tummala's avatar Sahitya Tummala Committed by David Brown
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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: default avatarSahitya Tummala <stummala@codeaurora.org>
Signed-off-by: default avatarDavid Brown <davidb@codeaurora.org>
parent b08bb35d

drivers/mmc/host/msm_sdcc.c

+6 −2
Original line number Diff line number Diff line
@@ -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;