diff options
Diffstat (limited to 'drivers/mmc/core/sd.c')
| -rw-r--r-- | drivers/mmc/core/sd.c | 49 |
1 files changed, 41 insertions, 8 deletions
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index fb18b301502e..ae54e8eb7fea 100644 --- a/drivers/mmc/core/sd.c +++ b/drivers/mmc/core/sd.c @@ -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) |