[SRU] [B/C/D/Unstable] [PATCH 0/2] Enable new Realtek card reader

Kai-Heng Feng kai.heng.feng at canonical.com
Mon Dec 3 06:27:18 UTC 2018

BugLink: https://bugs.launchpad.net/bugs/1806335

USB Storage based Realtek card reader doesn't work, because the
usb-storage module tries to use it in UAS mode instead of using

Add new IDs to ums-realtek driver.
In addition to that, we add a new module knob, "enable_mmc=", to
enable/disable MMC, as vendors may not pay MMC royalties. "enable_mmc"
defaults to 1.

After applying the patch, the card reader works, and verified
"enable_mmc=" can enable/disable MMC support.

[Regression Potential]
Minimal. This SRU enables two specific card readers that don't work as
UAS, the new module knob only introduces new behavior when enable_mmc=0.

Kai-Heng Feng (2):
  USB: usb-storage: Add new IDs to ums-realtek
  UBUNTU: SAUCE: (noup) USB: usb-storage: Make MMC support optional on

 drivers/usb/storage/realtek_cr.c      | 36 +++++++++++++++++++++++++++
 drivers/usb/storage/unusual_realtek.h | 10 ++++++++
 2 files changed, 46 insertions(+)


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