On 31/03/16 17:17, Naveen Kumar Parna wrote:
> 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.pa...@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);
> }
>
>
Is this the same as the following?
commit d9bfbb95ed598a09cf336adb0f190ee0ff802f0d
Author: Adrian Hunter <adrian.hun...@intel.com>
Date: Thu Nov 26 14:00:47 2015 +0200
mmc: sdio: Fix invalid vdd in voltage switch power cycle
The 'ocr' parameter passed to mmc_set_signal_voltage()
defines the power-on voltage used when power cycling
after a failure to set the voltage. However, in the
case of mmc_sdio_init_card(), the value passed has the
R4_18V_PRESENT flag set which is not valid for power-on
and results in an invalid vdd. Fix by passing the card's
ocr value which does not have the flag.
Signed-off-by: Adrian Hunter <adrian.hun...@intel.com>
Cc: sta...@vger.kernel.org # v3.13+
Signed-off-by: Ulf Hansson <ulf.hans...@linaro.org>
