On 12 September 2014 03:39, <micky_ch...@realsil.com.cn> wrote: > From: Roger Tseng <rogera...@realtek.com> > > Some platform have both UEFI driver and MFD/mmc driver, if entering > linux while card in the slot, the card power is already on, and rtsx-mmc > driver have no chance to make card power off. This will lead UHSI card > failed to enter UHSI mode. > > It is hard to control the UEFI driver leaving state, so we power off the > card power during probe. > > Signed-off-by: Roger Tseng <rogera...@realtek.com> > Signed-off-by: Micky Ching <micky_ch...@realsil.com.cn> > --- > drivers/mmc/host/rtsx_pci_sdmmc.c | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) > > diff --git a/drivers/mmc/host/rtsx_pci_sdmmc.c > b/drivers/mmc/host/rtsx_pci_sdmmc.c > index dfde4a2..57b0796 100644 > --- a/drivers/mmc/host/rtsx_pci_sdmmc.c > +++ b/drivers/mmc/host/rtsx_pci_sdmmc.c > @@ -1341,8 +1341,13 @@ static int rtsx_pci_sdmmc_drv_probe(struct > platform_device *pdev) > host->pcr = pcr; > host->mmc = mmc; > host->pdev = pdev; > - host->power_state = SDMMC_POWER_OFF; > INIT_WORK(&host->work, sd_request); > + sd_power_off(host); > + /* > + * ref: SD spec 3.01: 6.4.1.2 Power On or Power Cycle > + */ > + usleep_range(1000, 2000); > +
This won't work in cases were you power off eMMC cards, unless you can do a full power cycle - cut both VCC and VCCQ. Can you? There are also another option you might want to use, MMC_CAP2_NO_PRESCAN_POWERUP. But again, it must only be used for those hosts that you are able to do a full power cycle for. Kind regards Uffe > platform_set_drvdata(pdev, host); > pcr->slots[RTSX_SD_CARD].p_dev = pdev; > pcr->slots[RTSX_SD_CARD].card_event = rtsx_pci_sdmmc_card_event; > -- > 1.7.9.5 > -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
