media: rc: harmonize infrared durations to microseconds

rc-core kapi uses nanoseconds for infrared durations for receiving, and
microseconds for sending. The uapi already uses microseconds for both,
so this patch does not change the uapi.

Infrared durations do not need nanosecond resolution. IR protocols do not
have durations shorter than about 100 microseconds. Some IR hardware offers
250 microseconds resolution, which is sufficient for most protocols.
Better hardware has 50 microsecond resolution and is enough for every
protocol I am aware off.

Unify on microseconds everywhere. This simplifies the code since less
conversion between microseconds and nanoseconds needs to be done.

This affects:
 - rx_resolution member of struct rc_dev
 - timeout member of struct rc_dev
 - duration member in struct ir_raw_event

Cc: "Bruno Prémont" <bonbons@linux-vserver.org>
Cc: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Cc: Maxim Levitsky <maximlevitsky@gmail.com>
Cc: Patrick Lerda <patrick9876@free.fr>
Cc: Kevin Hilman <khilman@baylibre.com>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Jerome Brunet <jbrunet@baylibre.com>
Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Cc: Sean Wang <sean.wang@mediatek.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Patrice Chotard <patrice.chotard@st.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Chen-Yu Tsai <wens@csie.org>
Cc: "David Härdeman" <david@hardeman.nu>
Cc: Benjamin Valentin <benpicco@googlemail.com>
Cc: Antti Palosaari <crope@iki.fi>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

1 files changed, 3 insertions, 7 deletions

diff --git a/drivers/media/rc/streamzap.c b/drivers/media/rc/streamzap.c
index 79a41fc7161c..9f3cd9fb6b6e 100644
--- a/drivers/media/rc/streamzap.c
+++ b/drivers/media/rc/streamzap.c
@@ -137,7 +137,6 @@ static void sz_push_full_pulse(struct streamzap_ir *sz,
 		} else {
 			rawir.duration = delta;
 			rawir.duration -= sz->sum;
-			rawir.duration = US_TO_NS(rawir.duration);
 			rawir.duration = (rawir.duration > IR_MAX_DURATION) ?
 					 IR_MAX_DURATION : rawir.duration;
 		}
@@ -151,7 +150,6 @@ static void sz_push_full_pulse(struct streamzap_ir *sz,
 	rawir.duration = ((int) value) * SZ_RESOLUTION;
 	rawir.duration += SZ_RESOLUTION / 2;
 	sz->sum += rawir.duration;
-	rawir.duration = US_TO_NS(rawir.duration);
 	rawir.duration = (rawir.duration > IR_MAX_DURATION) ?
 			 IR_MAX_DURATION : rawir.duration;
 	sz_push(sz, rawir);
@@ -172,7 +170,6 @@ static void sz_push_full_space(struct streamzap_ir *sz,
 	rawir.duration = ((int) value) * SZ_RESOLUTION;
 	rawir.duration += SZ_RESOLUTION / 2;
 	sz->sum += rawir.duration;
-	rawir.duration = US_TO_NS(rawir.duration);
 	sz_push(sz, rawir);
 }
 
@@ -403,13 +400,12 @@ static int streamzap_probe(struct usb_interface *intf,
 	sz->decoder_state = PulseSpace;
 	/* FIXME: don't yet have a way to set this */
 	sz->timeout_enabled = true;
-	sz->rdev->timeout = ((US_TO_NS(SZ_TIMEOUT * SZ_RESOLUTION) &
-				IR_MAX_DURATION) | 0x03000000);
+	sz->rdev->timeout = SZ_TIMEOUT * SZ_RESOLUTION;
 	#if 0
 	/* not yet supported, depends on patches from maxim */
 	/* see also: LIRC_GET_REC_RESOLUTION and LIRC_SET_REC_TIMEOUT */
-	sz->min_timeout = US_TO_NS(SZ_TIMEOUT * SZ_RESOLUTION);
-	sz->max_timeout = US_TO_NS(SZ_TIMEOUT * SZ_RESOLUTION);
+	sz->min_timeout = SZ_TIMEOUT * SZ_RESOLUTION;
+	sz->max_timeout = SZ_TIMEOUT * SZ_RESOLUTION;
 	#endif
 
 	sz->signal_start = ktime_get_real();