[PATCH 4.19 20/44] mmc: core: Default to generic_cmd6_time as timeout in __mmc_switch()

Greg Kroah-Hartman
2022-05-23T17:13:10Z

From: Ulf Hansson <ulf.hansson@linaro.org>

commit 533a6cfe08f96a7b5c65e06d20916d552c11b256 upstream

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
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/mmc/core/mmc_ops.c | 16 +++++++---------
1 file changed, 7 insertions(+), 9 deletions(-)

--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -458,10 +458,6 @@ static int mmc_poll_for_busy(struct mmc_
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
@@ -534,6 +530,12 @@ int __mmc_switch(struct mmc_card *card,

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
@@ -542,7 +544,7 @@ int __mmc_switch(struct mmc_card *card,
* which also means they are on their own when it comes to deal with the
* busy timeout.
*/
- if (!(host->caps & MMC_CAP_NEED_RSP_BUSY) && timeout_ms &&
+ if (!(host->caps & MMC_CAP_NEED_RSP_BUSY) &&
host->max_busy_timeout && (timeout_ms > host->max_busy_timeout))
use_r1b_resp = false;

@@ -554,10 +556,6 @@ int __mmc_switch(struct mmc_card *card,
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;