From: Naveen Kumar Parna <naveenkumar.parna@gmail.com>
To: ulf.hansson@linaro.org, adrian.hunter@intel.com, chris@printf.net
Cc: linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org,
Naveen Kumar Parna <naveenkumar.parna@gmail.com>
Subject: [PATCH] mmc: core: Fix bug on signal voltage switch failure
Date: Thu, 31 Mar 2016 19:47:11 +0530 [thread overview]
Message-ID: <1459433831-4162-1-git-send-email-naveenkumar.parna@gmail.com> (raw)
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
next reply other threads:[~2016-03-31 14:17 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-31 14:17 Naveen Kumar Parna [this message]
2016-04-01 7:29 ` Adrian Hunter
2016-04-01 8:45 ` Naveen Kumar P
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