linux-kernel - Re: [PATCH v3] mmc: sdhci-pci-core: Disable ES for ASUS BIOS on Jasper Lake

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Date:   Fri, 14 Oct 2022 16:07:25 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Patrick Thompson <ptf@...gle.com>
Cc:     Linux MMC Development <linux-mmc@...r.kernel.org>,
        Sangwhan Moon <sxm@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] mmc: sdhci-pci-core: Disable ES for ASUS BIOS on
 Jasper Lake

On Thu, 13 Oct 2022 at 23:00, Patrick Thompson <ptf@...gle.com> wrote:
>
> Enhanced Strobe (ES) does not work correctly on the ASUS 1100 series of
> devices. Jasper Lake eMMCs (pci_id 8086:4dc4) are supposed to support
> ES. There are also two system families under the series, thus this is
> being scoped to the ASUS BIOS.
>
> The failing ES prevents the installer from writing to disk. Falling back
> to HS400 without ES fixes the issue.
>
> Signed-off-by: Patrick Thompson <ptf@...gle.com>
>
> Fixes: 315e3bd7ac19 ("mmc: sdhci-pci: Add support for Intel JSL")

Applied for fixes and by adding a stable tag, thanks!

Kind regards
Uffe


>
> ---
>
> Changes in v3:
> * Remove redundant MMC_CAP2_HS400 selection
>
> Changes in v2:
> * Only disable ES instead of CQE in its entirety.
> * Target Jasper Lake (JSL)
> * Target ASUS BIOS instead of specific system family
>
>  drivers/mmc/host/sdhci-pci-core.c | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
> index 169b84761041..34ea1acbb3cc 100644
> --- a/drivers/mmc/host/sdhci-pci-core.c
> +++ b/drivers/mmc/host/sdhci-pci-core.c
> @@ -914,6 +914,12 @@ static bool glk_broken_cqhci(struct sdhci_pci_slot *slot)
>                 dmi_match(DMI_SYS_VENDOR, "IRBIS"));
>  }
>
> +static bool jsl_broken_hs400es(struct sdhci_pci_slot *slot)
> +{
> +       return slot->chip->pdev->device == PCI_DEVICE_ID_INTEL_JSL_EMMC &&
> +                       dmi_match(DMI_BIOS_VENDOR, "ASUSTeK COMPUTER INC.");
> +}
> +
>  static int glk_emmc_probe_slot(struct sdhci_pci_slot *slot)
>  {
>         int ret = byt_emmc_probe_slot(slot);
> @@ -922,9 +928,11 @@ static int glk_emmc_probe_slot(struct sdhci_pci_slot *slot)
>                 slot->host->mmc->caps2 |= MMC_CAP2_CQE;
>
>         if (slot->chip->pdev->device != PCI_DEVICE_ID_INTEL_GLK_EMMC) {
> -               slot->host->mmc->caps2 |= MMC_CAP2_HS400_ES;
> -               slot->host->mmc_host_ops.hs400_enhanced_strobe =
> -                                               intel_hs400_enhanced_strobe;
> +               if (!jsl_broken_hs400es(slot)) {
> +                       slot->host->mmc->caps2 |= MMC_CAP2_HS400_ES;
> +                       slot->host->mmc_host_ops.hs400_enhanced_strobe =
> +                                                       intel_hs400_enhanced_strobe;
> +               }
>                 slot->host->mmc->caps2 |= MMC_CAP2_CQE_DCMD;
>         }
>
> --
> 2.38.0.413.g74048e4d9e-goog
>