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After a timeout, reset the controller using SDHCI_RESET_CMD|SDHCI_RESET_DATA

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rather than SDHCI_RESET_ALL; the latter turns off clocks and power, removing
any possibility of recovering from the error.

Also, double the timeout to 2 seconds.  Despite what the SD spec says about
all transactions completing in 250ms or less, I have a card which sometimes
takes more than a second to complete a write.
This commit is contained in:
Ian Lepore 2014-02-16 17:22:49 +00:00
parent 586a16c431
commit a6873fd141
1 changed files with 3 additions and 3 deletions
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6
sys/dev/sdhci/sdhci.c
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@ -725,7 +725,7 @@ sdhci_timeout(void *arg)
struct sdhci_slot *slot = arg;
if (slot->curcmd != NULL) {
sdhci_reset(slot, SDHCI_RESET_ALL);
sdhci_reset(slot, SDHCI_RESET_CMD|SDHCI_RESET_DATA);
slot->curcmd->error = MMC_ERR_TIMEOUT;
sdhci_req_done(slot);
}
@ -850,8 +850,8 @@ sdhci_start_command(struct sdhci_slot *slot, struct mmc_command *cmd)
sdhci_set_transfer_mode(slot, cmd->data);
/* Start command. */
WR2(slot, SDHCI_COMMAND_FLAGS, (cmd->opcode << 8) | (flags & 0xff));
/* Start timeout callout; no command should take more than a second. */
callout_reset(&slot->timeout_callout, hz, sdhci_timeout, slot);
/* Start timeout callout. */
callout_reset(&slot->timeout_callout, 2*hz, sdhci_timeout, slot);
}
static void