Messages in this thread Patch in this message | | | Date | Sat, 18 Jul 2009 20:34:37 -0400 (EDT) | From | Nicolas Pitre <> | Subject | [PATCH] [MMC] mvsdio: fix handling of partial word at the end of PIO transfer |
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Standard data flow for MMC/SD/SDIO cards requires that the mvsdio controller be set for big endian operation. This is causing problems with buffers which length is not a multiple of 4 bytes as the last partial word doesn't get shifted all the way and stored properly in memory. Let's compensate for this.
Signed-off-by: Nicolas Pitre <nico@marvell.com> CC: stable@kernel.org ---
Since Pierre is (quite unfortunately) stepping down from MMC maintenance, I'm resending this to you in the hope this will reach mainline in a timely manner. Some SDIO devices are broken without this.
diff --git a/drivers/mmc/host/mvsdio.c b/drivers/mmc/host/mvsdio.c index b56d72f..34e2348 100644 --- a/drivers/mmc/host/mvsdio.c +++ b/drivers/mmc/host/mvsdio.c @@ -384,7 +384,7 @@ static irqreturn_t mvsd_irq(int irq, void *dev) u16 val[2] = {0, 0}; val[0] = mvsd_read(MVSD_FIFO); val[1] = mvsd_read(MVSD_FIFO); - memcpy(p, &val, s); + memcpy(p, ((void *)&val) + 4 - s, s); s = 0; intr_status = mvsd_read(MVSD_NOR_INTR_STATUS); } @@ -423,7 +423,7 @@ static irqreturn_t mvsd_irq(int irq, void *dev) if (s < 4) { if (s && (intr_status & MVSD_NOR_TX_AVAIL)) { u16 val[2] = {0, 0}; - memcpy(&val, p, s); + memcpy(((void *)&val) + 4 - s, p, s); mvsd_write(MVSD_FIFO, val[0]); mvsd_write(MVSD_FIFO, val[1]); s = 0;
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