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mmc: make mmc_send_status() more reliable 

Align the card status polling with the Linux kernel and retry the
command at least five times. Also some cards apparently mishandle the
status bits, so make sure to check the card state too.

Signed-off-by: Jan Kloetzke <jan.kloetzke@dspg.com>
Cc: Andy Fleming <afleming@gmail.com>
This commit is contained in:
Jan Kloetzke 2012-02-05 22:29:12 +00:00 committed by Andy Fleming
parent 93ad0d18c0
commit d617c426a6
2 changed files with 14 additions and 8 deletions
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20
drivers/mmc/mmc.c
View File

@ -108,7 +108,7 @@ int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
int mmc_send_status(struct mmc *mmc, int timeout)
{
struct mmc_cmd cmd;
int err;
int err, retries = 5;
#ifdef CONFIG_MMC_TRACE
int status;
#endif
@ -121,17 +121,21 @@ int mmc_send_status(struct mmc *mmc, int timeout)
do {
err = mmc_send_cmd(mmc, &cmd, NULL);
if (err)
if (!err) {
if ((cmd.response[0] & MMC_STATUS_RDY_FOR_DATA) &&
(cmd.response[0] & MMC_STATUS_CURR_STATE) !=
MMC_STATE_PRG)
break;
else if (cmd.response[0] & MMC_STATUS_MASK) {
printf("Status Error: 0x%08X\n",
cmd.response[0]);
return COMM_ERR;
}
} else if (--retries < 0)
return err;
else if (cmd.response[0] & MMC_STATUS_RDY_FOR_DATA)
break;
udelay(1000);
if (cmd.response[0] & MMC_STATUS_MASK) {
printf("Status Error: 0x%08X\n", cmd.response[0]);
return COMM_ERR;
}
} while (timeout--);
#ifdef CONFIG_MMC_TRACE

2
include/mmc.h
View File

@ -112,6 +112,8 @@
#define MMC_STATUS_CURR_STATE (0xf << 9)
#define MMC_STATUS_ERROR (1 << 19)
#define MMC_STATE_PRG (7 << 9)
#define MMC_VDD_165_195 0x00000080 /* VDD voltage 1.65 - 1.95 */
#define MMC_VDD_20_21 0x00000100 /* VDD voltage 2.0 ~ 2.1 */
#define MMC_VDD_21_22 0x00000200 /* VDD voltage 2.1 ~ 2.2 */