linux-kernel - Re: [PATCH V7 1/5] mmc: sdhci: Add support for O2 eMMC HS200 mode

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Date:   Mon, 30 Jul 2018 17:05:51 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     "ernest.zhang" <ernest.zhang@...hubtech.com>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        chuanjin.pang@...hubtech.com, mike.li@...hubtech.com,
        chevron.li@...hubtech.com,
        "Shirley Her (SC)" <shirley.her@...hubtech.com>,
        xiaoguang.yu@...hubtech.com, bobby.wu@...hubtech.com
Subject: Re: [PATCH V7 1/5] mmc: sdhci: Add support for O2 eMMC HS200 mode

On 16 July 2018 at 08:26, ernest.zhang <ernest.zhang@...hubtech.com> 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@...hubtech.com>

Thanks, the series applied for next!

Kind regards
Uffe

> ---
> 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@...hubtech.com>
>   *          Adam Lee <adam.lee@...onical.com>
> + *          Ernest Zhang <ernest.zhang@...hubtech.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 */
> --
> 2.17.1
>