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mmc: don't call switch on old cards

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Make sure we don't call the switch function on cards too old to
support it. They should just ignore it, but some have been reported
to lock up instead.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
This commit is contained in:
Pierre Ossman 2007-05-31 22:25:11 +02:00
parent 71651297a4
commit 3373c0ae6a
1 changed files with 20 additions and 4 deletions
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24
drivers/mmc/core/sd.c
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@ -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;