This is a note to let you know that I've just added the patch titled
[media] img-ir/hw: Always read data to clear buffer
to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
img-ir-hw-always-read-data-to-clear-buffer.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ea0de4ec5489da0fe738b274effac4f950e93d76 Mon Sep 17 00:00:00 2001
From: Dylan Rajaratnam <dylan.rajaratnam@xxxxxxxxxx>
Date: Mon, 17 Nov 2014 09:17:45 -0300
Subject: [media] img-ir/hw: Always read data to clear buffer
From: Dylan Rajaratnam <dylan.rajaratnam@xxxxxxxxxx>
commit ea0de4ec5489da0fe738b274effac4f950e93d76 upstream.
A problem was found on Polaris where if the unit it booted via the power
button on the infrared remote then the next button press on the remote
would return the key code used to power on the unit.
The sequence is:
- The polaris powered off but with the powerdown controller (PDC) block
still powered.
- Press power key on remote, IR block receives the key.
- Kernel starts, IR code is in IMG_IR_DATA_x but neither IMG_IR_RXDVAL
or IMG_IR_RXDVALD2 are set.
- Wait any amount of time.
- Press any key.
- IMG_IR_RXDVAL or IMG_IR_RXDVALD2 is set but IMG_IR_DATA_x is
unchanged since the powerup key data was never read.
This is worked around by always reading the IMG_IR_DATA_x in
img_ir_set_decoder(), rather than only when the IMG_IR_RXDVAL or
IMG_IR_RXDVALD2 bit is set.
Signed-off-by: Dylan Rajaratnam <dylan.rajaratnam@xxxxxxxxxx>
Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/media/rc/img-ir/img-ir-hw.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/media/rc/img-ir/img-ir-hw.c
+++ b/drivers/media/rc/img-ir/img-ir-hw.c
@@ -541,10 +541,12 @@ static void img_ir_set_decoder(struct im
if (ir_status & (IMG_IR_RXDVAL | IMG_IR_RXDVALD2)) {
ir_status &= ~(IMG_IR_RXDVAL | IMG_IR_RXDVALD2);
img_ir_write(priv, IMG_IR_STATUS, ir_status);
- img_ir_read(priv, IMG_IR_DATA_LW);
- img_ir_read(priv, IMG_IR_DATA_UP);
}
+ /* always read data to clear buffer if IR wakes the device */
+ img_ir_read(priv, IMG_IR_DATA_LW);
+ img_ir_read(priv, IMG_IR_DATA_UP);
+
/* stop the end timer and switch back to normal mode */
del_timer_sync(&hw->end_timer);
hw->mode = IMG_IR_M_NORMAL;
Patches currently in stable-queue which might be from dylan.rajaratnam@xxxxxxxxxx are
queue-3.18/img-ir-hw-always-read-data-to-clear-buffer.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html