linux-kernel - [PATCH 3.16 064/294] media: lirc: LIRC_GET_REC

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Message-ID: <lsq.1510009382.610701494@decadent.org.uk>
Date:   Mon, 06 Nov 2017 23:03:02 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Derek" <user.vdr@...il.com>,
        "Mauro Carvalho Chehab" <mchehab@...pensource.com>,
        "Sean Young" <sean@...s.org>
Subject: [PATCH 3.16 064/294] media: lirc: LIRC_GET_REC_RESOLUTION should
 return microseconds

3.16.50-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Sean Young <sean@...s.org>

commit 9f5039ba440e499d85c29b1ddbc3cbc9dc90e44b upstream.

Since commit e8f4818895b3 ("[media] lirc: advertise
LIRC_CAN_GET_REC_RESOLUTION and improve") lircd uses the ioctl
LIRC_GET_REC_RESOLUTION to determine the shortest pulse or space that
the hardware can detect. This breaks decoding in lirc because lircd
expects the answer in microseconds, but nanoseconds is returned.

Reported-by: Derek <user.vdr@...il.com>
Tested-by: Derek <user.vdr@...il.com>
Signed-off-by: Sean Young <sean@...s.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...pensource.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/media/rc/ir-lirc-codec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/media/rc/ir-lirc-codec.c
+++ b/drivers/media/rc/ir-lirc-codec.c
@@ -257,7 +257,7 @@ static long ir_lirc_ioctl(struct file *f
 		return 0;
 
 	case LIRC_GET_REC_RESOLUTION:
-		val = dev->rx_resolution;
+		val = dev->rx_resolution / 1000;
 		break;
 
 	case LIRC_SET_WIDEBAND_RECEIVER: