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ANDROID: mmc: sd: Add new CONFIG_MMC_PARANOID_SD_INIT for enabling retries during SD detection

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Change-Id: I4e6b9d9a3600d7efbee1d8379e45db11c57827f2
Signed-off-by: San Mehat <san@google.com>
This commit is contained in:
San Mehat 2008-11-11 09:35:36 -08:00 committed by Amit Pundir
parent 8392add7be
commit ff172d75e3
2 changed files with 29 additions and 0 deletions
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7
drivers/mmc/core/Kconfig
View File

@ -80,3 +80,10 @@ config MMC_TEST
This driver is only of interest to those developing or
testing a host driver. Most people should say N here.
config MMC_PARANOID_SD_INIT
bool "Enable paranoid SD card initialization (EXPERIMENTAL)"
help
If you say Y here, the MMC layer will be extra paranoid
about re-trying SD init requests. This can be a useful
work-around for buggy controllers and hardware. Enable
if you are experiencing issues with SD detection.

22
drivers/mmc/core/sd.c
View File

@ -834,6 +834,9 @@ int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
bool reinit)
{
int err;
#ifdef CONFIG_MMC_PARANOID_SD_INIT
int retries;
#endif
if (!reinit) {
/*
@ -860,7 +863,26 @@ int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
/*
* Fetch switch information from card.
*/
#ifdef CONFIG_MMC_PARANOID_SD_INIT
for (retries = 1; retries <= 3; retries++) {
err = mmc_read_switch(card);
if (!err) {
if (retries > 1) {
printk(KERN_WARNING
"%s: recovered\n",
mmc_hostname(host));
}
break;
} else {
printk(KERN_WARNING
"%s: read switch failed (attempt %d)\n",
mmc_hostname(host), retries);
}
}
#else
err = mmc_read_switch(card);
#endif
if (err)
return err;
}