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List:       linux-mmc
Subject:    [PATCH] mmc: core: Fix bug on signal voltage switch failure
From:       Naveen Kumar Parna <naveenkumar.parna () gmail ! com>
Date:       2016-03-31 14:29:11
Message-ID: 1459433831-4162-1-git-send-email-naveenkumar.parna () gmail ! com
[Download RAW message or body]

When switching SD and SDIO cards from 3.3V to 1.8V signal level fails, a bug in \
sdhci_set_power() will trigger. To fix the kernel crash during recovery from signal \
voltage switch failure, OCR should be reset to avail voltage mask before power-cycle \
the card.

Signed-off-by: Naveen Kumar Parna <naveenkumar.parna@gmail.com>
---
 drivers/mmc/core/core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index f26a5f1..e7eb427 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1477,6 +1477,8 @@ power_cycle:
 	if (err) {
 		pr_debug("%s: Signal voltage switch failed, "
 			"power cycling card\n", mmc_hostname(host));
+		/* Reset OCR mask */
+		ocr =  host->ocr_avail;
 		mmc_power_cycle(host, ocr);
 	}
 
-- 
1.9.1

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