From: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
To: linuxtv-commits@linuxtv.org
Cc: stable@vger.kernel.org, Sean Young <sean@mess.org>
Subject: [git:media_stage/master] media: ir_toy: prevent device from hanging during transmit
Date: Sun, 19 Sep 2021 09:19:37 +0000 [thread overview]
Message-ID: <E1mXGvT-004Ah2-N9@www.linuxtv.org> (raw)
This is an automatic generated email to let you know that the following patch were queued:
Subject: media: ir_toy: prevent device from hanging during transmit
Author: Sean Young <sean@mess.org>
Date: Tue Sep 14 16:57:46 2021 +0200
If the IR Toy is receiving IR while a transmit is done, it may end up
hanging. We can prevent this from happening by re-entering sample mode
just before issuing the transmit command.
Link: https://github.com/bengtmartensson/HarcHardware/discussions/25
Cc: stable@vger.kernel.org
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
drivers/media/rc/ir_toy.c | 21 ++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)
---
diff --git a/drivers/media/rc/ir_toy.c b/drivers/media/rc/ir_toy.c
index 3e729a17b35f..48d52baec1a1 100644
--- a/drivers/media/rc/ir_toy.c
+++ b/drivers/media/rc/ir_toy.c
@@ -24,6 +24,7 @@ static const u8 COMMAND_VERSION[] = { 'v' };
// End transmit and repeat reset command so we exit sump mode
static const u8 COMMAND_RESET[] = { 0xff, 0xff, 0, 0, 0, 0, 0 };
static const u8 COMMAND_SMODE_ENTER[] = { 's' };
+static const u8 COMMAND_SMODE_EXIT[] = { 0 };
static const u8 COMMAND_TXSTART[] = { 0x26, 0x24, 0x25, 0x03 };
#define REPLY_XMITCOUNT 't'
@@ -309,12 +310,30 @@ static int irtoy_tx(struct rc_dev *rc, uint *txbuf, uint count)
buf[i] = cpu_to_be16(v);
}
- buf[count] = cpu_to_be16(0xffff);
+ buf[count] = 0xffff;
irtoy->tx_buf = buf;
irtoy->tx_len = size;
irtoy->emitted = 0;
+ // There is an issue where if the unit is receiving IR while the
+ // first TXSTART command is sent, the device might end up hanging
+ // with its led on. It does not respond to any command when this
+ // happens. To work around this, re-enter sample mode.
+ err = irtoy_command(irtoy, COMMAND_SMODE_EXIT,
+ sizeof(COMMAND_SMODE_EXIT), STATE_RESET);
+ if (err) {
+ dev_err(irtoy->dev, "exit sample mode: %d\n", err);
+ return err;
+ }
+
+ err = irtoy_command(irtoy, COMMAND_SMODE_ENTER,
+ sizeof(COMMAND_SMODE_ENTER), STATE_COMMAND);
+ if (err) {
+ dev_err(irtoy->dev, "enter sample mode: %d\n", err);
+ return err;
+ }
+
err = irtoy_command(irtoy, COMMAND_TXSTART, sizeof(COMMAND_TXSTART),
STATE_TX);
kfree(buf);
next reply other threads:[~2021-10-04 5:54 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-19 9:19 Mauro Carvalho Chehab [this message]
2021-09-19 9:19 [git:media_stage/master] media: ir_toy: prevent device from hanging during transmit Mauro Carvalho Chehab
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