Fix RX fail issue on Exar USB serial driver after resume from S3/S4

[Shrirang Bagul]

Resolution of LP: #1645591 added support for Exar USB UART devices in Ubuntu Xenial kernel. However, the devices fail to RX data after system resumes from suspend-to-ram(S3) and suspend-to-disk(S4). This bug is to track the integration of the driver released by the vendor to fix this issue.

Changelog:

Version 1B, 11/6/2015
Fixed Bug: The conditional logic to support kernel 3.9 was incorrect(line 396 in xr_usb_serial_common.c).

Version 1A, 1/9/2015
This driver will work with any USB UART function in these Exar devices:
        XR21V1410/1412/1414
        XR21B1411
        XR21B1420/1422/1424
        XR22801/802/804

Exar serial devices are typically enuremated as /dev/ttyXRUSB[0-3]

This bug is used for tracking purposes, please do not triage.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 4.4.0-77.98

---------------
linux (4.4.0-77.98) xenial; urgency=low

  * linux: 4.4.0-77.98 -proposed tracker (LP: #1686040)

  * [Hyper-V][SAUCE] pci-hyperv: Use only 16 bit integer for PCI domain
    (LP: #1684971)
    - SAUCE: pci-hyperv: Use only 16 bit integer for PCI domain

  * Upgrade Redpine WLAN/BT driver to ver. 1.2.RC4 (LP: #1669672)
    - SAUCE: sdhci: use PCI ID to identify Dell IoT gateways
    - SAUCE: Redpine: Upgrade to ver. 1.2.RC4
    - [Config] Update CONFIG_VEN_RSI_* configs
    - SAUCE: Redpine: add copyright to kernel packages

  * Fix RX fail issue on Exar USB serial driver after resume from S3/S4
    (LP: #1685133)
    - SAUCE: xr-usb-serial: Update driver for Exar USB serial ports

  * Miscellaneous Ubuntu changes
    - [Config] updating configs to match redpine driver changes

 -- Kleber Sacilotto de Souza <email address hidden> Tue, 25 Apr 2017 19:32:01 +0200

[Timo Aaltonen (tjaalton)]

still need to send this for bionic kernel