[PATCH 4.9 09/25] mmc: core: Default to generic_cmd6_time as timeout in __mmc_switch()

Greg Kroah-Hartman
2022-05-23T17:05:34Z

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: Kamal Dasu <kdasu.kdev@gmail.com>
[kamal: Drop non-existent hunks in 4.9's __mmc_switch]
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/mmc/core/mmc_ops.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)

--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -22,8 +22,6 @@
#include "host.h"
#include "mmc_ops.h"

-#define MMC_OPS_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
-
static const u8 tuning_blk_pattern_4bit[] = {
0xff, 0x0f, 0xff, 0x00, 0xff, 0xcc, 0xc3, 0xcc,
0xc3, 0x3c, 0xcc, 0xff, 0xfe, 0xff, 0xfe, 0xef,
@@ -530,8 +528,11 @@ int __mmc_switch(struct mmc_card *card,
ignore_crc = false;

/* We have an unspecified cmd timeout, use the fallback value. */
- if (!timeout_ms)
- timeout_ms = MMC_OPS_TIMEOUT_MS;
+ if (!timeout_ms) {
+ pr_warn("%s: unspecified timeout for CMD6 - use generic\n",
+ mmc_hostname(host));
+ timeout_ms = card->ext_csd.generic_cmd6_time;
+ }

/* Must check status to be sure of no errors. */
timeout = jiffies + msecs_to_jiffies(timeout_ms) + 1;