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Bug#912300: marked as done (linux-image-amd64: SD card reader on Dell E7250 doesn't work in Debian Stretch)

Your message dated Fri, 28 May 2021 23:58:58 -0700 (PDT)
with message-id <60b1e632.1c69fb81.54d52.075d@mx.google.com>
and subject line Closing this bug (BTS maintenance for src:linux bugs)
has caused the Debian Bug report #912298,
regarding linux-image-amd64: SD card reader on Dell E7250 doesn't work in Debian Stretch
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
912298: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=912298
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: linux-image-amd64
Version: 4.9+80+deb9u6
Severity: normal

There is a known issue on 4.x kernels for this device:

01:00.0 SD Host controller: O2 Micro, Inc. SD/MMC Card Reader Controller (rev 01)
sdhci-pci 0000:01:00.0: SDHCI controller found [1217:8520] (rev 1)

Whenever we try to use this reader with any kind of SD card, it doesn't work
 and reports the following in dmesg:

[ 4357.435988] sdhci: Timeout waiting for Buffer Read Ready interrupt during tuning procedure, falling back to fixed sampling clock
[ 4357.443304] mmc0: tuning execution failed: -5
[ 4357.443315] mmc0: error -5 whilst initialising SD card

There is a same issue open on Ubuntu bug tracker: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1514821

I have tried the solution from:
https://www.0xf8.org/2016/01/workaround-for-broken-o2-micro-sd-card-reader-support-since-linux-kernel-version-4-1-8/
which proposes loading the `sdhci` module with a debug_quirks2="0x4" flag, but it doesn't work and people report this error comes back after every kernel update.

This bug persisted since Debian Stretch appeared and never been fixed in any of kernel updates.

It seems someone already submitted a patch in linux.kernel.mmc but it was never included in Debian mainline:
http://comments.gmane.org/gmane.linux.kernel.mmc/34979


-- System Information:
Debian Release: 9.5
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-8-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages linux-image-amd64 depends on:
ii  linux-image-4.9.0-8-amd64  4.9.110-3+deb9u6

linux-image-amd64 recommends no packages.

linux-image-amd64 suggests no packages.

-- no debconf information

--- End Message ---
--- Begin Message --- 
Hi

This bug was filed for a very old kernel or the bug is old itself
without resolution.

If you can reproduce it with

- the current version in unstable/testing
- the latest kernel from backports

please reopen the bug, see https://www.debian.org/Bugs/server-control
for details.

Regards,
Salvatore

--- End Message ---
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