linux-kernel - [PATCH] Fix RC5 decoding with Fintek CIR chipset

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Message-ID: <20160514170126.GU14068@earth.li>
Date:	Sat, 14 May 2016 18:01:26 +0100
From:	Jonathan McDowell <noodles@...th.li>
To:	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	David Härdeman <david@...deman.nu>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>
Subject: [PATCH] Fix RC5 decoding with Fintek CIR chipset

Fix RC5 decoding with Fintek CIR chipset

Commit e87b540be2dd02552fb9244d50ae8b4e4619a34b tightened up the RC5
decoding by adding a check for trailing silence to ensure a valid RC5
command had been received. Unfortunately the trailer length checked was
10 units and the Fintek CIR device does not want to provide details of a
space longer than 6350us. This meant that RC5 remotes working on a
Fintek setup on 3.16 failed on 3.17 and later. Fix this by shortening
the trailer check to 6 units (allowing for a previous space in the
received remote command).

Signed-off-by: Jonathan McDowell <noodles@...th.li>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=117221
Cc: stable@...r.kernel.org

-----
diff --git a/drivers/media/rc/ir-rc5-decoder.c b/drivers/media/rc/ir-rc5-decoder.c
index 6ffe776..a0fd4e6 100644
--- a/drivers/media/rc/ir-rc5-decoder.c
+++ b/drivers/media/rc/ir-rc5-decoder.c
@@ -29,7 +29,7 @@
 #define RC5_BIT_START		(1 * RC5_UNIT)
 #define RC5_BIT_END		(1 * RC5_UNIT)
 #define RC5X_SPACE		(4 * RC5_UNIT)
-#define RC5_TRAILER		(10 * RC5_UNIT) /* In reality, approx 100 */
+#define RC5_TRAILER		(6 * RC5_UNIT) /* In reality, approx 100 */

 enum rc5_state {
 	STATE_INACTIVE,
-----

J.

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