linux-kernel - eMMC boot problem: switch to bus width 8 ddr failed

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Message-ID: <20170106004114.GA22893@archie.localdomain>
Date:   Fri, 6 Jan 2017 01:41:14 +0100
From:   Clemens Gruber <clemens.gruber@...ruber.com>
To:     linux-mmc@...r.kernel.org
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Dong Aisheng <aisheng.dong@....com>,
        linux-kernel@...r.kernel.org
Subject: eMMC boot problem: switch to bus width 8 ddr failed

Hi,

with the current mainline 4.10-rc2 kernel, I can no longer boot from
the eMMC on my i.MX6Q board.

Details:
The eMMC is a Micron MTFC4GACAJCN-1M WT but as the i.MX6Q only supports
eMMC 4.41 features and we did not implement voltage switching from 3.3V
to 1.8V or lower, I did add no-1-8-v; (but none of the mmc-ddr or mmc-hs
options) to the device tree. The bus-width is 8.

With 4.9 the board booted fine, now with the current mainline 4.10 tree,
I get the following (repeating) errors at boot:

[    4.326834] Waiting for root device /dev/mmcblk0p2...
[   14.563861] mmc0: Timeout waiting for hardware cmd interrupt.
[   14.569619] sdhci: =========== REGISTER DUMP (mmc0)===========
[   14.575461] sdhci: Sys addr: 0x4e726000 | Version:  0x00000002
[   14.581300] sdhci: Blk size: 0x00000200 | Blk cnt:  0x00000001
[   14.587140] sdhci: Argument: 0x00010000 | Trn mode: 0x00000013
[   14.592979] sdhci: Present:  0x01fd8009 | Host ctl: 0x00000031
[   14.598816] sdhci: Power:    0x00000002 | Blk gap:  0x00000080
[   14.604654] sdhci: Wake-up:  0x00000008 | Clock:    0x0000001f
[   14.610493] sdhci: Timeout:  0x0000008f | Int stat: 0x00000000
[   14.616332] sdhci: Int enab: 0x107f100b | Sig enab: 0x107f100b
[   14.622168] sdhci: AC12 err: 0x00000000 | Slot int: 0x00000003
[   14.628007] sdhci: Caps:     0x07eb0000 | Caps_1:   0x0000a007
[   14.633845] sdhci: Cmd:      0x00000d1a | Max curr: 0x00ffffff
[   14.639682] sdhci: Host ctl2: 0x00000000
[   14.643611] sdhci: ADMA Err: 0x00000000 | ADMA Ptr: 0x4e6f7208
[   14.649447] sdhci: ===========================================

This repeats a few times, then more information is shown at the bottom:

[   86.893859] mmc0: Timeout waiting for hardware cmd interrupt.
[   86.899615] sdhci: =========== REGISTER DUMP (mmc0)===========
[   86.905453] sdhci: Sys addr: 0x00000000 | Version:  0x00000002
[   86.911291] sdhci: Blk size: 0x00000200 | Blk cnt:  0x00000001
[   86.917129] sdhci: Argument: 0x00010000 | Trn mode: 0x00000013
[   86.922967] sdhci: Present:  0x01fd8009 | Host ctl: 0x00000031
[   86.928804] sdhci: Power:    0x00000002 | Blk gap:  0x00000080
[   86.934642] sdhci: Wake-up:  0x00000008 | Clock:    0x0000001f
[   86.940479] sdhci: Timeout:  0x0000008f | Int stat: 0x00000000
[   86.946316] sdhci: Int enab: 0x107f100b | Sig enab: 0x107f100b
[   86.952154] sdhci: AC12 err: 0x00000000 | Slot int: 0x00000003
[   86.957992] sdhci: Caps:     0x07eb0000 | Caps_1:   0x0000a007
[   86.963830] sdhci: Cmd:      0x00000d1a | Max curr: 0x00ffffff
[   86.969668] sdhci: Host ctl2: 0x00000000
[   86.973596] sdhci: ADMA Err: 0x00000000 | ADMA Ptr: 0x00000000
[   86.979433] sdhci: ===========================================
[   86.986356] mmc0: switch to bus width 8 ddr failed
[   86.991163] mmc0: error -110 whilst initialising MMC card
[   97.773859] mmc0: Timeout waiting for hardware cmd interrupt.

--

After looking through the latest commits to mmc/core, I found the
culprit:
Commit e173f8911f091fa50ccf8cc1fa316dd5569bc470 ("mmc: core: Update
CMD13 polling policy when switch to HS DDR mode") 

Reverting it fixes the problem. But I am unsure if that's the right
course of action?

Feel free to send me patches for testing!

Regards,
Clemens