Messages in this thread | | | Date | Wed, 14 Jan 2015 09:53:33 +0100 | Subject | Re: [PATCH] mmc: sdhci: Set SDHCI_POWER_ON with external vmmc | From | Ulf Hansson <> |
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+ linux-mmc
On 14 January 2015 at 07:24, Tim Kryger <tim.kryger@gmail.com> wrote: > Host controllers lacking the required internal vmmc regulator may still > follow the spec with regard to the LSB of SDHCI_POWER_CONTROL. Set the > SDHCI_POWER_ON bit when vmmc is enabled to encourage the controller to > to drive CMD, DAT, SDCLK. > > This fixes a regression observed on some Qualcomm and Nvidia boards > caused by 5222161 mmc: sdhci: Improve external VDD regulator support. > > Signed-off-by: Tim Kryger <tim.kryger@gmail.com> > Tested-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Thanks! Applied for fixes.
I noticed this wasn't posted to linux-mmc. I am anyway picking it up as this change has already been discussed and tested, see: https://lkml.org/lkml/2014/11/3/1029
Kind regards Uffe
> --- > drivers/mmc/host/sdhci.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c > index ada1a3e..59a328a 100644 > --- a/drivers/mmc/host/sdhci.c > +++ b/drivers/mmc/host/sdhci.c > @@ -1239,6 +1239,12 @@ static void sdhci_set_power(struct sdhci_host *host, unsigned char mode, > spin_unlock_irq(&host->lock); > mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd); > spin_lock_irq(&host->lock); > + > + if (mode != MMC_POWER_OFF) > + sdhci_writeb(host, SDHCI_POWER_ON, SDHCI_POWER_CONTROL); > + else > + sdhci_writeb(host, 0, SDHCI_POWER_CONTROL); > + > return; > } > > -- > 1.9.1 >
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