Re: SD slot errors

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On Fri, Apr 13, 2018 at 11:45 PM, D. Hugh Redelmeier <hugh@xxxxxxxxxx> wrote:
> I've just installed F28 beta on my Cube Mix Plus tablet.  It seems to
> work but a sequence of messages keep showing up in the dmesg
> output every 10 seconds.
>
> Note: this is the first time I've used Linux with this machine so I don't
> know if the problem would show up with F27.
>
> [  537.896013] mmc1: Timeout waiting for hardware cmd interrupt.
> [  537.896023] mmc1: sdhci: ============ SDHCI REGISTER DUMP ===========
> [  537.896037] mmc1: sdhci: Sys addr:  0x00000000 | Version:  0x00001002
> [  537.896048] mmc1: sdhci: Blk size:  0x00000000 | Blk cnt:  0x00000000
> [  537.896053] mmc1: sdhci: Argument:  0x00000000 | Trn mode: 0x00000000
> [  537.896059] mmc1: sdhci: Present:   0x000a0001 | Host ctl: 0x00000001
> [  537.896065] mmc1: sdhci: Power:     0x0000000e | Blk gap:  0x00000080
> [  537.896070] mmc1: sdhci: Wake-up:   0x00000000 | Clock:    0x0000e8c7
> [  537.896075] mmc1: sdhci: Timeout:   0x00000000 | Int stat: 0x00000000
> [  537.896081] mmc1: sdhci: Int enab:  0x00ff0043 | Sig enab: 0x00ff0043
> [  537.896086] mmc1: sdhci: AC12 err:  0x00000000 | Slot int: 0x00000000
> [  537.896092] mmc1: sdhci: Caps:      0x7568c881 | Caps_1:   0x00000807
> [  537.896097] mmc1: sdhci: Cmd:       0x00000102 | Max curr: 0x00000000
> [  537.896103] mmc1: sdhci: Resp[0]:   0x00000000 | Resp[1]:  0x00000000
> [  537.896108] mmc1: sdhci: Resp[2]:   0x00000000 | Resp[3]:  0x00000000
> [  537.896112] mmc1: sdhci: Host ctl2: 0x00000000
> [  537.896118] mmc1: sdhci: ADMA Err:  0x00000000 | ADMA Ptr: 0x0000000000000000
> [  537.896121] mmc1: sdhci: ============================================
>
> This looks to me as if it is trying to open the SD card (but there
> is no SD card in the slot).  Why would it do this?

If the card detect pin isn't properly wired up or isn't properly
exported by the firmware or something similar it might have to poll it
to notice if a card has been inserted/removed.

> Here's the part of dmesg output where the slot is recognized:

The details you have below is for two SD controllers and the errors
above are for mmc1 so my bet is actually that the WiFi is hooked up to
SDIO via mmc1.

> [    2.093265] sdhci: Secure Digital Host Controller Interface driver
> [    2.093267] sdhci: Copyright(c) Pierre Ossman
> [    2.111345] sdhci-pci 0000:00:1e.4: SDHCI controller found [8086:9d2b] (rev 21)
> [    2.111363] sdhci-pci 0000:00:1e.4: enabling device (0000 -> 0002)
> [    2.112328] mmc0: SDHCI controller on PCI [0000:00:1e.4] using ADMA 64-bit
> [    2.112348] sdhci-pci 0000:00:1e.6: SDHCI controller found [8086:9d2d] (rev 21)
> [    2.112364] sdhci-pci 0000:00:1e.6: enabling device (0000 -> 0002)
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