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mmc: core: Default to generic_cmd6_time as timeout in __mmc_switch()

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All callers of __mmc_switch() should now be specifying a valid timeout for
the CMD6 command. However, just to be sure, let's print a warning and
default to use the generic_cmd6_time in case the provided timeout_ms
argument is zero.

In this context, let's also simplify some of the corresponding code and
clarify some related comments.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://lore.kernel.org/r/20200122142747.5690-4-ulf.hansson@linaro.org
This commit is contained in:
Ulf Hansson 2020-01-22 15:27:47 +01:00
parent ad91619aa9
commit 533a6cfe08
1 changed files with 11 additions and 14 deletions
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25
drivers/mmc/core/mmc_ops.c
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@ -460,10 +460,6 @@ static int mmc_poll_for_busy(struct mmc_card *card, unsigned int timeout_ms,
bool expired = false;
bool busy = false;
/* We have an unspecified cmd timeout, use the fallback value. */
if (!timeout_ms)
timeout_ms = MMC_OPS_TIMEOUT_MS;
/*
* In cases when not allowed to poll by using CMD13 or because we aren't
* capable of polling by using ->card_busy(), then rely on waiting the
@ -536,14 +532,19 @@ int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
mmc_retune_hold(host);
if (!timeout_ms) {
pr_warn("%s: unspecified timeout for CMD6 - use generic\n",
mmc_hostname(host));
timeout_ms = card->ext_csd.generic_cmd6_time;
}
/*
* If the cmd timeout and the max_busy_timeout of the host are both
* specified, let's validate them. A failure means we need to prevent
* the host from doing hw busy detection, which is done by converting
* to a R1 response instead of a R1B.
* If the max_busy_timeout of the host is specified, make sure it's
* enough to fit the used timeout_ms. In case it's not, let's instruct
* the host to avoid HW busy detection, by converting to a R1 response
* instead of a R1B.
*/
if (timeout_ms && host->max_busy_timeout &&
(timeout_ms > host->max_busy_timeout))
if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout))
use_r1b_resp = false;
cmd.opcode = MMC_SWITCH;
@ -554,10 +555,6 @@ int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
cmd.flags = MMC_CMD_AC;
if (use_r1b_resp) {
cmd.flags |= MMC_RSP_SPI_R1B | MMC_RSP_R1B;
/*
* A busy_timeout of zero means the host can decide to use
* whatever value it finds suitable.
*/
cmd.busy_timeout = timeout_ms;
} else {
cmd.flags |= MMC_RSP_SPI_R1 | MMC_RSP_R1;