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mmc: break apart switch function

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Break apart the SD switch function into one that reads the capabilities
and one that acts on them.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
This commit is contained in:
Pierre Ossman 2007-05-01 14:46:08 +02:00
parent 55556da012
commit 1addfcdbe4
1 changed files with 41 additions and 8 deletions
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49
drivers/mmc/core/sd.c
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@ -183,16 +183,13 @@ static void mmc_decode_scr(struct mmc_card *card)
}
/*
* Test if the card supports high-speed mode and, if so, switch to it.
* Fetches and decodes switch information
*/
static int mmc_switch_hs(struct mmc_card *card)
static int mmc_read_switch(struct mmc_card *card)
{
int err;
u8 *status;
if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
return MMC_ERR_NONE;
err = MMC_ERR_FAILED;
status = kmalloc(64, GFP_KERNEL);
@ -209,14 +206,43 @@ static int mmc_switch_hs(struct mmc_card *card)
* Card not supporting high-speed will ignore the
* command.
*/
if (err == MMC_ERR_TIMEOUT)
err = MMC_ERR_NONE;
err = MMC_ERR_NONE;
goto out;
}
if (status[13] & 0x02)
card->sw_caps.hs_max_dtr = 50000000;
out:
kfree(status);
return err;
}
/*
* Test if the card supports high-speed mode and, if so, switch to it.
*/
static int mmc_switch_hs(struct mmc_card *card)
{
int err;
u8 *status;
if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
return MMC_ERR_NONE;
if (card->sw_caps.hs_max_dtr == 0)
return MMC_ERR_NONE;
err = MMC_ERR_FAILED;
status = kmalloc(64, GFP_KERNEL);
if (!status) {
printk("%s: could not allocate a buffer for switch "
"capabilities.\n",
mmc_hostname(card->host));
return err;
}
err = mmc_sd_switch(card, 1, 0, 1, status);
if (err != MMC_ERR_NONE)
goto out;
@ -393,7 +419,14 @@ int mmc_attach_sd(struct mmc_host *host, u32 ocr)
mmc_decode_scr(card);
/*
* Check if card can be switched into high-speed mode.
* Fetch switch information from card.
*/
err = mmc_read_switch(card);
if (err != MMC_ERR_NONE)
goto free_card;
/*
* Attempt to change to high-speed (if supported)
*/
err = mmc_switch_hs(card);
if (err != MMC_ERR_NONE)