On 19/06/18 09:31, Kurt Kanzenbach wrote:
> Sometimes the eMMC controller doesn't respond anymore on Intel Baytrail
> SoCs. The resulting error looks like:
>
> |mmc1: Reset 0x1 never completed.
> |sdhci: =========== REGISTER DUMP (mmc1)===========
> |sdhci: Sys addr: 0xffffffff | Version: 0x0000ffff
> |sdhci: Blk size: 0x0000ffff | Blk cnt: 0x0000ffff
> |sdhci: Argument: 0xffffffff | Trn mode: 0x0000ffff
> |sdhci: Present: 0xffffffff | Host ctl: 0x000000ff
> |sdhci: Power: 0x000000ff | Blk gap: 0x000000ff
> |sdhci: Wake-up: 0x000000ff | Clock: 0x0000ffff
> |sdhci: Timeout: 0x000000ff | Int stat: 0xffffffff
> |sdhci: Int enab: 0xffffffff | Sig enab: 0xffffffff
> |sdhci: AC12 err: 0x0000ffff | Slot int: 0x0000ffff
> |sdhci: Caps: 0xffffffff | Caps_1: 0xffffffff
> |sdhci: Cmd: 0x0000ffff | Max curr: 0xffffffff
> |sdhci: Host ctl2: 0x0000ffff
> |sdhci: ADMA Err: 0xffffffff | ADMA Ptr: 0xffffffff
>
> The behavior was observed on an Intel Atom E3825 performing lots of reboots. The
So you are saying this only happens at boot time? And only when re-booting?
Can you send all the kernel messages? Can you send an acpidump?
> issue seems to occur if runtime power management is used. Found by utilizing
> ftrace.
>
> The erratum VLI10 for the Intel E3825 states, that the eMMC controller
> incorrectly announces that it supports suspend/resume. However, that shouldn't
> be used, as the controller may incorrectly transfer data between memory and the
> SD device.
That erratum is not related to this problem. The suspend/resume that is
documented is an internal SDHCI feature, not the kernel's suspend/resume.
The SDHCI Suspend/Resume Mechanism is not supported in the driver, so it is
not being used anyway.
>
> Therefore, disallowing runtime pm resolves the issue. Tested on the E3825.
>
> Signed-off-by: Kurt Kanzenbach <kurt@xxxxxxxxxxxxx>
> ---
> drivers/mmc/host/sdhci-pci-core.c | 17 ++++++++++++++++-
> 1 file changed, 16 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
> index 77dd3521daae..df89381944cd 100644
> --- a/drivers/mmc/host/sdhci-pci-core.c
> +++ b/drivers/mmc/host/sdhci-pci-core.c
> @@ -870,6 +870,21 @@ static const struct sdhci_pci_fixes sdhci_intel_byt_emmc = {
> .priv_size = sizeof(struct intel_host),
> };
>
> +/*
> + * See Erratum VLI10 from Errata List for Intel Atom E3825, Link:
> + * https://www.intel.ca/content/dam/www/public/us/en/documents/specification-updates/atom-e3800-family-spec-update.pdf
> + */
> +static const struct sdhci_pci_fixes sdhci_intel_byt_emmc_no_runtime_pm = {
> + .allow_runtime_pm = false,
> + .probe_slot = byt_emmc_probe_slot,
> + .quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
> + .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
> + SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400 |
> + SDHCI_QUIRK2_STOP_WITH_TC,
> + .ops = &sdhci_intel_byt_ops,
> + .priv_size = sizeof(struct intel_host),
> +};
> +
> static const struct sdhci_pci_fixes sdhci_intel_glk_emmc = {
> .allow_runtime_pm = true,
> .probe_slot = glk_emmc_probe_slot,
> @@ -1470,7 +1485,7 @@ static const struct pci_device_id pci_ids[] = {
> SDHCI_PCI_SUBDEVICE(INTEL, BYT_SDIO, NI, 7884, ni_byt_sdio),
> SDHCI_PCI_DEVICE(INTEL, BYT_SDIO, intel_byt_sdio),
> SDHCI_PCI_DEVICE(INTEL, BYT_SD, intel_byt_sd),
> - SDHCI_PCI_DEVICE(INTEL, BYT_EMMC2, intel_byt_emmc),
> + SDHCI_PCI_DEVICE(INTEL, BYT_EMMC2, intel_byt_emmc_no_runtime_pm),
> SDHCI_PCI_DEVICE(INTEL, BSW_EMMC, intel_byt_emmc),
> SDHCI_PCI_DEVICE(INTEL, BSW_SDIO, intel_byt_sdio),
> SDHCI_PCI_DEVICE(INTEL, BSW_SD, intel_byt_sd),
>
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