Messages in this thread | | | Date | Wed, 17 Sep 2014 17:11:18 +0800 | From | micky <> | Subject | Re: [PATCH] mmc: rtsx: add card power off during probe |
| |
On 09/17/2014 02:01 AM, Ulf Hansson wrote: > On 12 September 2014 03:39, <micky_ching@realsil.com.cn> wrote: >> From: Roger Tseng <rogerable@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 <rogerable@realtek.com> >> Signed-off-by: Micky Ching <micky_ching@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? Hi Uffe,
VCCQ will poweroff at the same time.
if MMC_CAP2_NO_PRESCAN_POWERUP enable, will call mmc_power_off() at start, then it will check ios.power_mode, but the state is MMC_POWER_OFF and just return.
Best Regards. micky.
> 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 >> > . >
| |