This is a note to let you know that I've just added the patch titled
Input: elan_i2c - clear INT before resetting controller
to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: input-elan_i2c-clear-int-before-resetting-controller.patch and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Tue Apr 10 10:31:53 CEST 2018
From: KT Liao kt.liao@emc.com.tw Date: Thu, 25 May 2017 10:06:21 -0700 Subject: Input: elan_i2c - clear INT before resetting controller
From: KT Liao kt.liao@emc.com.tw
[ Upstream commit 4b3c7dbbfff0673e8a89575414b864d8b001d3bb ]
Some old touchpad FWs need to have interrupt cleared before issuing reset command after updating firmware. We clear interrupt by attempting to read full report from the controller, and discarding any data read.
Signed-off-by: KT Liao kt.liao@emc.com.tw Signed-off-by: Dmitry Torokhov dmitry.torokhov@gmail.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/input/mouse/elan_i2c_i2c.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
--- a/drivers/input/mouse/elan_i2c_i2c.c +++ b/drivers/input/mouse/elan_i2c_i2c.c @@ -557,7 +557,14 @@ static int elan_i2c_finish_fw_update(str long ret; int error; int len; - u8 buffer[ETP_I2C_INF_LENGTH]; + u8 buffer[ETP_I2C_REPORT_LEN]; + + len = i2c_master_recv(client, buffer, ETP_I2C_REPORT_LEN); + if (len != ETP_I2C_REPORT_LEN) { + error = len < 0 ? len : -EIO; + dev_warn(dev, "failed to read I2C data after FW WDT reset: %d (%d)\n", + error, len); + }
reinit_completion(completion); enable_irq(client->irq);
Patches currently in stable-queue which might be from kt.liao@emc.com.tw are
queue-4.4/input-elantech-force-relative-mode-on-a-certain-module.patch queue-4.4/input-elan_i2c-clear-int-before-resetting-controller.patch