On Sun, Mar 26, 2017 at 01:14:45PM +0200, Hans de Goede wrote: > SDIO cards may need clock to send the card interrupt to the host. > > On a cherrytrail tablet with a RTL8723BS wifi chip, without this patch > pinging the tablet results in: > > PING 192.168.1.14 (192.168.1.14) 56(84) bytes of data. > 64 bytes from 192.168.1.14: icmp_seq=1 ttl=64 time=78.6 ms > 64 bytes from 192.168.1.14: icmp_seq=2 ttl=64 time=1760 ms > 64 bytes from 192.168.1.14: icmp_seq=3 ttl=64 time=753 ms > 64 bytes from 192.168.1.14: icmp_seq=4 ttl=64 time=3.88 ms > 64 bytes from 192.168.1.14: icmp_seq=5 ttl=64 time=795 ms > 64 bytes from 192.168.1.14: icmp_seq=6 ttl=64 time=1841 ms > 64 bytes from 192.168.1.14: icmp_seq=7 ttl=64 time=810 ms > 64 bytes from 192.168.1.14: icmp_seq=8 ttl=64 time=1860 ms > 64 bytes from 192.168.1.14: icmp_seq=9 ttl=64 time=812 ms > 64 bytes from 192.168.1.14: icmp_seq=10 ttl=64 time=48.6 ms > > Where as with this patch I get: > > PING 192.168.1.14 (192.168.1.14) 56(84) bytes of data. > 64 bytes from 192.168.1.14: icmp_seq=1 ttl=64 time=3.96 ms > 64 bytes from 192.168.1.14: icmp_seq=2 ttl=64 time=1.97 ms > 64 bytes from 192.168.1.14: icmp_seq=3 ttl=64 time=17.2 ms > 64 bytes from 192.168.1.14: icmp_seq=4 ttl=64 time=2.46 ms > 64 bytes from 192.168.1.14: icmp_seq=5 ttl=64 time=2.83 ms > 64 bytes from 192.168.1.14: icmp_seq=6 ttl=64 time=1.40 ms > 64 bytes from 192.168.1.14: icmp_seq=7 ttl=64 time=2.10 ms > 64 bytes from 192.168.1.14: icmp_seq=8 ttl=64 time=1.40 ms > 64 bytes from 192.168.1.14: icmp_seq=9 ttl=64 time=2.04 ms > 64 bytes from 192.168.1.14: icmp_seq=10 ttl=64 time=1.40 ms > > Cc: Dong Aisheng <b29396@xxxxxxxxxxxxx> > Cc: Ian W MORRISON <ianwmorrison@xxxxxxxxx> > Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> I supposed there may be someone wanting to add feature to support SDIO cards with the capability of signal interrupt without clock in the future, the exist logic may still be worth kept. So, Acked-by: Dong Aisheng <aisheng.dong@xxxxxxx> Regards Dong Aisheng > --- > Changes in v2: > -New patch replacing "mmc: sdhci: sdio-intel: Set > SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON quirk" > Changes in v3: > -Always get / put the runtime pm-ref instead of using a quirk, as (almost) > all sdhci controllers need this > -Use pm_runtime_get_noresume / pm_runtime_put_noidle as the caller must > already have claimed the mmc-host so we will already be runtime-resumed > when called > --- > 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 9c1a099..63bc33a 100644 > --- a/drivers/mmc/host/sdhci.c > +++ b/drivers/mmc/host/sdhci.c > @@ -1830,6 +1830,9 @@ static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable) > struct sdhci_host *host = mmc_priv(mmc); > unsigned long flags; > > + if (enable) > + pm_runtime_get_noresume(host->mmc->parent); > + > spin_lock_irqsave(&host->lock, flags); > if (enable) > host->flags |= SDHCI_SDIO_IRQ_ENABLED; > @@ -1838,6 +1841,9 @@ static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable) > > sdhci_enable_sdio_irq_nolock(host, enable); > spin_unlock_irqrestore(&host->lock, flags); > + > + if (!enable) > + pm_runtime_put_noidle(host->mmc->parent); > } > > static int sdhci_start_signal_voltage_switch(struct mmc_host *mmc, > -- > 2.9.3 > > -- > 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 -- 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
