linux-kernel - [PATCH stable 4.14 3/3] mmc: core: Default to generic_cmd6_time as timeout in __mmc

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Message-Id: <20220517182746.252893-4-f.fainelli@gmail.com>
Date:   Tue, 17 May 2022 11:27:46 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     stable@...r.kernel.org
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Avri Altman <avri.altman@....com>,
        Bean Huo <beanhuo@...ron.com>,
        Nishad Kamdar <nishadkamdar@...il.com>,
        Christian Löhle <CLoehle@...erstone.com>,
        linux-mmc@...r.kernel.org (open list:MULTIMEDIA CARD (MMC), SECURE
        DIGITAL (SD) AND...), linux-kernel@...r.kernel.org (open list),
        alcooperx@...il.com, kdasu.kdev@...il.com
Subject: [PATCH stable 4.14 3/3] mmc: core: Default to generic_cmd6_time as timeout in __mmc_switch()

From: Ulf Hansson <ulf.hansson@...aro.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@...aro.org>
Link: https://lore.kernel.org/r/20200122142747.5690-4-ulf.hansson@linaro.org
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 drivers/mmc/core/mmc_ops.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index 44e90062c95a..0767ed1b820f 100644
--- 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_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
@@ -534,14 +530,20 @@ 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 (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;
@@ -552,10 +554,6 @@ 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;
-- 
2.25.1