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FAILED: patch "[PATCH] media: ir_toy: prevent device from hanging during transmit" failed to apply to 5.15-stable tree

PATCH [email protected] 1 participant 1 message Nov 13, 2021

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Stable branch Media (V4L/DVB) RC-core / lirc framework
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The patch below does not apply to the 5.15-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 <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 4114978dcd24e72415276bba60ff4ff355970bbc Mon Sep 17 00:00:00 2001
From: Sean Young <[email protected]>
Date: Tue, 14 Sep 2021 16:57:46 +0200
Subject: [PATCH] media: ir_toy: prevent device from hanging during transmit

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 [email protected]
[mchehab: renamed: s/STATE_RESET/STATE_COMMAND_NO_RESP/ ]
Signed-off-by Sean Young <[email protected]>
Signed-off-by Mauro Carvalho Chehab <[email protected]>
drivers/media/rc/ir_toy.c +20 -1
index d2d9346eb8f5..71aced52248f 100644
@@ -26,6 +26,7 @@ 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'

@@ -317,12 +318,30 @@ 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_COMMAND_NO_RESP);
+	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);