diff options
| -rw-r--r-- | drivers/mmc/core/sd.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index 5afac208118..41bfb5dfe6f 100644 --- a/drivers/mmc/core/sd.c +++ b/drivers/mmc/core/sd.c @@ -15,6 +15,7 @@ #include <linux/mmc/host.h> #include <linux/mmc/card.h> #include <linux/mmc/mmc.h> +#include <linux/mmc/sd.h> #include "core.h" #include "sysfs.h" @@ -192,6 +193,16 @@ static int mmc_read_switch(struct mmc_card *card) int err; u8 *status; + if (card->scr.sda_vsn < SCR_SPEC_VER_1) + return MMC_ERR_NONE; + + if (!(card->csd.cmdclass & CCC_SWITCH)) { + printk(KERN_WARNING "%s: card lacks mandatory switch " + "function, performance might suffer.\n", + mmc_hostname(card->host)); + return MMC_ERR_NONE; + } + err = MMC_ERR_FAILED; status = kmalloc(64, GFP_KERNEL); @@ -204,10 +215,9 @@ static int mmc_read_switch(struct mmc_card *card) err = mmc_sd_switch(card, 0, 0, 1, status); if (err != MMC_ERR_NONE) { - /* - * Card not supporting high-speed will ignore the - * command. - */ + printk(KERN_WARNING "%s: problem reading switch " + "capabilities, performance might suffer.\n", + mmc_hostname(card->host)); err = MMC_ERR_NONE; goto out; } @@ -229,6 +239,12 @@ static int mmc_switch_hs(struct mmc_card *card) int err; u8 *status; + if (card->scr.sda_vsn < SCR_SPEC_VER_1) + return MMC_ERR_NONE; + + if (!(card->csd.cmdclass & CCC_SWITCH)) + return MMC_ERR_NONE; + if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED)) return MMC_ERR_NONE; |