On Wed, 2 Sep 2015 01:02:17 +0530 Vaibhav Hiremath <vaibhav.hiremath@xxxxxxxxxx> wrote: > Currently, the sdhci_do_start_signal_voltage_switch() function invokes > controller specific voltage switch configuration only for 1.8v usecase; > but it is required for others as well. > > For example, in case of PXA1928 SDH controller, we need to set different > configuration for 3.3, 1.8 and 1.2 volt support (I/O domain power > control register). > > Signed-off-by: Vaibhav Hiremath <vaibhav.hiremath@xxxxxxxxxx> > --- > Note: > Currently ->voltage_switch() callback is only supported > in f_sdh30 driver. And I am not sure on the dependency of execution > sequence for that device. I could have moved ->voltage_switch() call > at one common place (above/below), but was not quite sure about it. > So, replicated/duplicated the call for other voltages. > > drivers/mmc/host/sdhci.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c > index 3dd295f..b59b76d 100644 > --- a/drivers/mmc/host/sdhci.c > +++ b/drivers/mmc/host/sdhci.c > @@ -1753,6 +1753,10 @@ static int sdhci_do_start_signal_voltage_switch(struct sdhci_host *host, > /* Wait for 5ms */ > usleep_range(5000, 5500); > > + /* Some controller need to do more when switching */ > + if (host->ops->voltage_switch) > + host->ops->voltage_switch(host, MMC_SIGNAL_VOLTAGE_330); Could this be implemented by regulator API? From patch set 3/3, the pxa1928 voltage_switch hook is to operate the IO pad registers, this seems not belong to the SDHC IP core. Thanks, Jisheng > + > /* 3.3V regulator output should be stable within 5 ms */ > ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2); > if (!(ctrl & SDHCI_CTRL_VDD_180)) > @@ -1803,6 +1807,10 @@ static int sdhci_do_start_signal_voltage_switch(struct sdhci_host *host, > return -EIO; > } > } > + /* Some controller need to do more when switching */ > + if (host->ops->voltage_switch) > + host->ops->voltage_switch(host, MMC_SIGNAL_VOLTAGE_120); > + > return 0; > default: > /* No signal voltage switch required */ -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
