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    SubjectRe: [PATCH V7 1/5] mmc: sdhci: Add support for O2 eMMC HS200 mode
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    On 16/07/18 09:26, ernest.zhang wrote:
    > When use eMMC as boot device, the eMMC signaling voltage is tied to 1.8v
    > fixed output voltage, bios can set o2 sd host controller PCI configuration
    > register 0x308 bit4 to 1 to let driver skip 3.3v signaling voltage and
    > direct use 1.8v singling voltage in eMMC initialize process.
    >
    > Signed-off-by: ernest.zhang <ernest.zhang@bayhubtech.com>

    Acked-by: Adrian Hunter <adrian.hunter@intel.com>

    > ---
    > Changes in V7:
    > Move V6 change item 2 to a seperate patch file
    >
    > Changes in V6:
    > 1.Move change log to correct place.
    > 2.Change HS200 mode clock frequency from 208MHz to 200MHz to meet
    > Specification.
    >
    > Changes in V5:
    > Modify code format to pass checkpatch.pl check and add a summary
    > of what has changed in each version.
    >
    > Changes in V4:
    > Skip SDIO and SD initalization when register 0x308 bit 4 is set,
    > and modify some typo.
    >
    > Changes in V3:
    > Rebase the patch on the mmc tree 'next' branch.
    >
    > Changes in V2:
    > Modify code format, and delete unused code path.
    >
    > Changes in V1:
    > Check PCIe register 0x308 bit 4 and skip eMMC 3.3v initialization
    > process if it is set to 1.
    > ---
    > drivers/mmc/host/sdhci-pci-o2micro.c | 18 ++++++++++++++++++
    > 1 file changed, 18 insertions(+)
    >
    > diff --git a/drivers/mmc/host/sdhci-pci-o2micro.c b/drivers/mmc/host/sdhci-pci-o2micro.c
    > index 555970a29c94..ba59db6a126c 100644
    > --- a/drivers/mmc/host/sdhci-pci-o2micro.c
    > +++ b/drivers/mmc/host/sdhci-pci-o2micro.c
    > @@ -3,6 +3,7 @@
    > *
    > * Authors: Peter Guo <peter.guo@bayhubtech.com>
    > * Adam Lee <adam.lee@canonical.com>
    > + * Ernest Zhang <ernest.zhang@bayhubtech.com>
    > *
    > * This software is licensed under the terms of the GNU General Public
    > * License version 2, as published by the Free Software Foundation, and
    > @@ -39,6 +40,7 @@
    > #define O2_SD_MISC_CTRL4 0xFC
    > #define O2_SD_TUNING_CTRL 0x300
    > #define O2_SD_PLL_SETTING 0x304
    > +#define O2_SD_MISC_SETTING 0x308
    > #define O2_SD_CLK_SETTING 0x328
    > #define O2_SD_CAP_REG2 0x330
    > #define O2_SD_CAP_REG0 0x334
    > @@ -184,6 +186,7 @@ int sdhci_pci_o2_probe_slot(struct sdhci_pci_slot *slot)
    > struct sdhci_pci_chip *chip;
    > struct sdhci_host *host;
    > u32 reg;
    > + int ret;
    >
    > chip = slot->chip;
    > host = slot->host;
    > @@ -197,6 +200,21 @@ int sdhci_pci_o2_probe_slot(struct sdhci_pci_slot *slot)
    > if (reg & 0x1)
    > host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
    >
    > + if (chip->pdev->device == PCI_DEVICE_ID_O2_SEABIRD0) {
    > + ret = pci_read_config_dword(chip->pdev,
    > + O2_SD_MISC_SETTING, &reg);
    > + if (ret)
    > + return -EIO;
    > + if (reg & (1 << 4)) {
    > + pr_info("%s: emmc 1.8v flag is set, force 1.8v signaling voltage\n",
    > + mmc_hostname(host->mmc));
    > + host->flags &= ~SDHCI_SIGNALING_330;
    > + host->flags |= SDHCI_SIGNALING_180;
    > + host->mmc->caps2 |= MMC_CAP2_NO_SD;
    > + host->mmc->caps2 |= MMC_CAP2_NO_SDIO;
    > + }
    > + }
    > +
    > if (chip->pdev->device != PCI_DEVICE_ID_O2_FUJIN2)
    > break;
    > /* set dll watch dog timer */
    >

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