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    SubjectRe: [PATCH v2 00/40] Tegra SDHCI add support for HS200 and UHS signaling
    Date
    On Fri, 2018-08-10 at 21:08 +0300, Aapo Vienamo wrote:
    > Hi all,
    >
    > This series implements support for faster signaling modes on Tegra
    > SDHCI controllers. This series consist of several parts: changes
    > requried for 1.8 V signaling and pad control, pad calibration, and
    > tuning. Following earlies patch sets have been merged into this
    > larger set: "Tegra PMC pinctrl pad configuration", "Tegra SDHCI
    > enable
    > 1.8 V signaling on Tegar210 and Tegra186", "Tegra SDHCI update the
    > padautocal procedure". Also the patches for enabling SDHCI tuning
    > are added.

    I tried your tkln/hs200 branch on Colibri T20, Apalis/Colibri T30 and
    Apalis TK1. It at least does not seem to make things any worse but
    HS200 on TK1 still seems to behave strangely. During boot I do get the
    following message (mmc0 being the SDHCI instance of one of them SD card
    slots):

    [ 3.238360] mmc0: Internal clock never stabilised.
    [ 3.243183] mmc0: sdhci: ============ SDHCI REGISTER DUMP
    ===========
    [ 3.249649] mmc0: sdhci: Sys addr: 0x00000000 |
    Version: 0x00000303
    [ 3.256138] mmc0: sdhci: Blk size: 0x00000000 | Blk
    cnt: 0x00000000
    [ 3.262657] mmc0: sdhci: Argument: 0x00000000 | Trn mode:
    0x00000000
    [ 3.269119] mmc0: sdhci: Present: 0x01fb00f0 | Host ctl:
    0x00000000
    [ 3.275580] mmc0: sdhci: Power: 0x0000000f | Blk
    gap: 0x00000000
    [ 3.282041] mmc0: sdhci: Wake-up: 0x00000000 |
    Clock: 0x00000401
    [ 3.288485] mmc0: sdhci: Timeout: 0x00000000 | Int stat:
    0x00000000
    [ 3.295037] mmc0: sdhci: Int enab: 0x00ff0003 | Sig enab:
    0x00fc0003
    [ 3.301559] mmc0: sdhci: AC12 err: 0x00000000 | Slot int:
    0x00000000
    [ 3.308022] mmc0: sdhci: Caps: 0x376fd080 |
    Caps_1: 0x10000f70
    [ 3.314527] mmc0: sdhci: Cmd: 0x00000000 | Max curr:
    0x00000000
    [ 3.321159] mmc0: sdhci: Resp[0]: 0x00000000 |
    Resp[1]: 0x00000000
    [ 3.327642] mmc0: sdhci: Resp[2]: 0x00000000 |
    Resp[3]: 0x00000000
    [ 3.334144] mmc0: sdhci: Host ctl2: 0x00000000
    [ 3.338613] mmc0: sdhci: ADMA Err: 0x00000000 | ADMA Ptr:
    0x00000000
    [ 3.345110] mmc0: sdhci:
    ============================================

    And it subsequently stalls waiting for interrupt for more than 8
    seconds before continuing to mount the rootfs as follows (mmc2 being
    the SDHCI instance of the eMMC):

    [ 4.874017] tegra-hdmi 54280000.hdmi: cannot set audio to 48000 Hz
    at 297000000 Hz pixel clock
    [ 13.930136] mmc2: Timeout waiting for hardware interrupt.
    [ 13.935603] mmc2: sdhci: ============ SDHCI REGISTER DUMP
    ===========
    [ 13.942071] mmc2: sdhci: Sys addr: 0x00000000 |
    Version: 0x00000303
    [ 13.948511] mmc2: sdhci: Blk size: 0x00007080 | Blk
    cnt: 0x00000001
    [ 13.954948] mmc2: sdhci: Argument: 0x00000000 | Trn mode:
    0x00000013
    [ 13.961385] mmc2: sdhci: Present: 0x01fb00f0 | Host ctl:
    0x00000031
    [ 13.967821] mmc2: sdhci: Power: 0x00000001 | Blk
    gap: 0x00000000
    [ 13.974263] mmc2: sdhci: Wake-up: 0x00000000 |
    Clock: 0x00000007
    [ 13.980692] mmc2: sdhci: Timeout: 0x0000000e | Int stat:
    0x00000000
    [ 13.987119] mmc2: sdhci: Int enab: 0x02ff000b | Sig enab:
    0x02fc000b
    [ 13.993546] mmc2: sdhci: AC12 err: 0x00000000 | Slot int:
    0x00000000
    [ 13.999974] mmc2: sdhci: Caps: 0x376fd080 |
    Caps_1: 0x10000f70
    [ 14.006415] mmc2: sdhci: Cmd: 0x0000153a | Max curr:
    0x00000000
    [ 14.012845] mmc2: sdhci: Resp[0]: 0x00000b00 |
    Resp[1]: 0x048062bf
    [ 14.019272] mmc2: sdhci: Resp[2]: 0x314a8000 |
    Resp[3]: 0x00000240
    [ 14.025697] mmc2: sdhci: Host ctl2: 0x0000000b
    [ 14.030132] mmc2: sdhci: ADMA Err: 0x00000000 | ADMA Ptr:
    0xfbc6b208
    [ 14.036561] mmc2: sdhci:
    ============================================
    [ 14.044332] mmc2: new HS200 MMC card at address 0001
    [ 14.050656] mmcblk2: mmc2:0001 016G30 14.7 GiB
    [ 14.056376] mmcblk2boot0: mmc2:0001 016G30 partition 1 4.00 MiB
    [ 14.063563] mmcblk2boot1: mmc2:0001 016G30 partition 2 4.00 MiB
    [ 14.069589] mmcblk2rpmb: mmc2:0001 016G30 partition 3 4.00 MiB,
    chardev (247:0)
    [ 14.078260] mmcblk2: p1 p2

    After that it actually seems to work quite nicely:

    root@apalis-tk1-mainline:~# cat /sys/kernel/debug/mmc2/ios
    clock: 200000000 Hz
    actual clock: 163200000 Hz
    vdd: 21 (3.3 ~ 3.4 V)
    bus mode: 2 (push-pull)
    chip select: 0 (don't care)
    power mode: 2 (on)
    bus width: 3 (8 bits)
    timing spec: 9 (mmc HS200)
    signal voltage: 1 (1.80 V)
    driver type: 0 (driver type B)
    root@apalis-tk1-mainline:~# hdparm -t /dev/mmcblk2

    /dev/mmcblk2:
    Timing buffered disk reads: 408 MB in 3.01 seconds = 135.39 MB/sec

    Have you ever observed similar behaviour? What could cause this?

    Anybody else tried it on TK1?
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