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[Blackgr <blackfate86@xxxxxxxxx>]

Can verify that after removing the following bit and recompiled the
kernel, the SD card reader played fine.

diff --git a/drivers/mmc/host/sdhci-pci.c b/drivers/mmc/host/sdhci-pci.c
index b3b0a3e..27b0e11 100644
--- a/drivers/mmc/host/sdhci-pci.c
+++ b/drivers/mmc/host/sdhci-pci.c
@@ -618,7 +618,7 @@ static int jmicron_resume(struct sdhci_pci_chip *chip)
 static const struct sdhci_pci_fixes sdhci_o2 = {
        .probe = sdhci_pci_o2_probe,
        .quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
-       .quirks2 = SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD,
+       /* .quirks2 = SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD, */
        .probe_slot = sdhci_pci_o2_probe_slot,
        .resume = sdhci_pci_o2_resume,
 };

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https://bugs.launchpad.net/bugs/1523178

Title:
  SD card reader on Dell E7450 doesn't work in Ubuntu 15.10 - O2 Micro,
  Inc. SD/MMC Card Reader Controller [1217:8520]

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Under ubuntu 15.10 I can't use my Sandisk ultra 64GB microSD (with a
  SD card adapter) with the built in SD card reader. I seem to be
  getting the following errors.

  [ 1268.126602] sdhci: Timeout waiting for Buffer Read Ready interrupt during tuning procedure, falling back to fixed sampling clock
  [ 1268.128381] mmc0: tuning execution failed
  [ 1268.128386] mmc0: error -5 whilst initialising SD card
  [ 1268.554319] sdhci: Timeout waiting for Buffer Read Ready interrupt during tuning procedure, falling back to fixed sampling clock
  [ 1268.556098] mmc0: tuning execution failed
  [ 1268.556103] mmc0: error -5 whilst initialising SD card
  [ 1268.993995] sdhci: Timeout waiting for Buffer Read Ready interrupt during tuning procedure, falling back to fixed sampling clock
  [ 1268.995778] mmc0: tuning execution failed
  [ 1268.995786] mmc0: error -5 whilst initialising SD card
  [ 1269.453666] sdhci: Timeout waiting for Buffer Read Ready interrupt during tuning procedure, falling back to fixed sampling clock
  [ 1269.455449] mmc0: tuning execution failed
  [ 1269.455458] mmc0: error -5 whilst initialising SD card

  It was working fine under vivid with kernel 3.19.

  Went through all the kernels from 3.19 to 4.2
  (http://kernel.ubuntu.com/~kernel-ppa/) and found out that until
  4.1.8-040108-generic the SD card reader would play fine and only after
  I put 4.1.9 and on I started getting the errors.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-19-generic 4.2.0-19.23
  ProcVersionSignature: Ubuntu 4.2.0-19.23-generic 4.2.6
  Uname: Linux 4.2.0-19-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  alex       1606 F.... pulseaudio
   /dev/snd/controlC0:  alex       1606 F.... pulseaudio
   /dev/snd/controlC1:  alex       1606 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun Dec  6 01:40:18 2015
  HibernationDevice: RESUME=UUID=acf75838-59f9-4461-9fe4-e9bdf33b28be
  InstallationDate: Installed on 2015-10-27 (38 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  MachineType: Dell Inc. Latitude E7450
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-19-generic root=UUID=c654e4bc-b0e1-4a85-844f-99f068b2efff ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-19-generic N/A
   linux-backports-modules-4.2.0-19-generic  N/A
   linux-firmware                            1.149.3
  SourcePackage: linux
  UpgradeStatus: Upgraded to wily on 2015-11-04 (31 days ago)
  dmi.bios.date: 10/28/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A08
  dmi.board.name: 0R1VJD
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA08:bd10/28/2015:svnDellInc.:pnLatitudeE7450:pvr:rvnDellInc.:rn0R1VJD:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E7450
  dmi.sys.vendor: Dell Inc.

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