On Wed, Feb 26, 2020 at 11:37:17AM +0100, gregkh@xxxxxxxxxxxxxxxxxxx wrote:
The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 679aac5ead2f18d223554a52b543e1195e181811 Mon Sep 17 00:00:00 2001
From: satya priya <skakit@xxxxxxxxxxxxxx>
Date: Tue, 11 Feb 2020 15:43:02 +0530
Subject: [PATCH] tty: serial: qcom_geni_serial: Fix RX cancel command failure
RX cancel command fails when BT is switched on and off multiple times.
To handle this, poll for the cancel bit in SE_GENI_S_IRQ_STATUS register
instead of SE_GENI_S_CMD_CTRL_REG.
As per the HPG update, handle the RX last bit after cancel command
and flush out the RX FIFO buffer.
Signed-off-by: satya priya <skakit@xxxxxxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/1581415982-8793-1-git-send-email-skakit@xxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
For 4.19, I took this mix of cleanups and fixes:
bdc05a8a3f82 ("tty: serial: qcom_geni_serial: Remove xfer_mode variable")
9e06d55f7b85 ("tty: serial: qcom_geni_serial: Remove use of *_relaxed() and mb()")
64a428077758 ("tty: serial: qcom_geni_serial: Remove interrupt storm")
a85fb9ce1fab ("tty: serial: qcom_geni_serial: Remove set_rfr_wm() and related variables")
663abb1a7a7f ("tty: serial: qcom_geni_serial: Fix UART hang")
This patch isn't needed on older kernels.
--
Thanks,
Sasha
