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mmc: sdio: fix setting card data bus width as 4-bit

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SDIO_CCCR_IF[1:0] in SDIO card is used for card data bus width
setting as below:

     00b: 1-bit bus
     01b: Reserved
     10b: 4-bit bus
     11b: 8-bit bus (only for embedded SDIO)

And sdio_enable_wide is for setting data bus width as 4-bit.
But currently, it first reads the register, second OR' 1b with
SDIO_CCCR_IF[1], and then writes it back.

As we can see, this is based on such assumption that the
SDIO_CCCR_IF[0] is always 0. Apparently, this is not right.

Signed-off-by: Yong Ding <[email protected]>
Acked-by: Philip Rakity <[email protected]>
Signed-off-by: Chris Ball <[email protected]>
This commit is contained in:
Yong Ding 2012-05-15 13:09:43 +08:00 • committed by Chris Ball
commit 2a0fe914a3
2 changed files with 8 additions and 0 deletions
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6
drivers/mmc/core/sdio.c
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@ -218,6 +218,12 @@ static int sdio_enable_wide(struct mmc_card *card)
if (ret)
return ret;
if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
pr_warning("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
mmc_hostname(card->host), ctrl);
/* set as 4-bit bus width */
ctrl &= ~SDIO_BUS_WIDTH_MASK;
ctrl |= SDIO_BUS_WIDTH_4BIT;
ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);