Hi, I've encountered a problem on an Intel Atom E3825. When performing lots of reboots (10, 50, 100, ...) the eMMC controller stops working. The reset commands won't work anymore and you get error messages such as: |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 After using ftrace, I've discovered that this issue happens when runtime power management is utilized. So after searching a bit, I've found the errata list for the E3825: https://www.intel.ca/content/dam/www/public/us/en/documents/specification-updates/atom-e3800-family-spec-update.pdf Erratum VLI10 basically states, that suspend/resume shouldn't be used. Otherwise wrong data between memory the device may be transferred. Therefore, I've disabled runtime power management and the issue disappeared. That's what the following patch does. This patch is tested against v4.17 and v4.9. Any suggestions? Kurt Kanzenbach (1): mmc: sdhci-pci: fix eMMC controller issue on Intel Baytrail SoCs drivers/mmc/host/sdhci-pci-core.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) -- 2.11.0 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
