linux-kernel - [PATCH] mmc: core: Fix busy polling for MMC_SEND_OP

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Date:   Tue, 17 May 2022 12:10:46 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     linux-mmc@...r.kernel.org,
        Jean Rene Dawin <jdawin@...h.uni-bielefeld.de>,
        "H . Nikolaus Schaller" <hns@...delico.com>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Huijin Park <huijin.park@...sung.com>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.com
Subject: [PATCH] mmc: core: Fix busy polling for MMC_SEND_OP_COND again

It turned out that polling period for MMC_SEND_OP_COND, that currently is
set to 1ms, still isn't sufficient. In particular a Micron eMMC on a
Beaglebone platform, is reported to sometimes fail to initialize.

Additional test, shows that extending the period to 4ms is working fine, so
let's make that change.

Reported-by: Jean Rene Dawin <jdawin@...h.uni-bielefeld.de>
Tested-by: Jean Rene Dawin <jdawin@...h.uni-bielefeld.de>
Fixes: 1760fdb6fe9f (mmc: core: Restore (almost) the busy polling for MMC_SEND_OP_COND")
Fixes: 76bfc7ccc2fa ("mmc: core: adjust polling interval for CMD1")
Cc: stable@...r.kernel.com
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
---
 drivers/mmc/core/mmc_ops.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index 180d7e9d3400..81c55bfd6e0c 100644
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -21,7 +21,7 @@
 
 #define MMC_BKOPS_TIMEOUT_MS		(120 * 1000) /* 120s */
 #define MMC_SANITIZE_TIMEOUT_MS		(240 * 1000) /* 240s */
-#define MMC_OP_COND_PERIOD_US		(1 * 1000) /* 1ms */
+#define MMC_OP_COND_PERIOD_US		(4 * 1000) /* 4ms */
 #define MMC_OP_COND_TIMEOUT_MS		1000 /* 1s */
 
 static const u8 tuning_blk_pattern_4bit[] = {
-- 
2.25.1