linux-kernel - Re: [PATCH v2 00/40] Tegra SDHCI add support for HS200 and UHS signaling

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Date:   Mon, 27 Aug 2018 17:50:53 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Aapo Vienamo <avienamo@...dia.com>
Cc:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "jonathanh@...dia.com" <jonathanh@...dia.com>,
        "mperttunen@...dia.com" <mperttunen@...dia.com>,
        "stefan@...er.ch" <stefan@...er.ch>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        "adrian.hunter@...el.com" <adrian.hunter@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 00/40] Tegra SDHCI add support for HS200 and UHS
 signaling

On Mon, Aug 27, 2018 at 02:10:58PM +0000, Marcel Ziswiler wrote:
> 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@...lis-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@...lis-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?

I can't reproduce this on Jetson TK1. Things boot normally and I don't
see the controllers switch into HS200 for either eMMC or SD card.

Did you update the device tree to enable HS200 on Apalis?

Aapo, isn't there a mechanism to prevent HS200 on devices where it
hasn't explicitly been tested (and enabled)? I thought we had discussed
that this was going to depend on pinmux DTS entries, but I can't find
the actual code where any of that would be checked. I only see checking
NVQUIRK_NEEDS_PAD_CONTROL in tegra_sdhci_is_pad_and_regulator_valid(),
but since we don't enable that quirk on Tegra124, it would seem to me
that we always enable fast modes on boards that don't need pad control.
Is that really what we want?

Also, if the above is correct, then why am I not seeing faster modes
getting enabled on Jetson TK1?

Thierry

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