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, 4 insertions, 6 deletions

diff --git a/drivers/media/rc/winbond-cir.c b/drivers/media/rc/winbond-cir.c
index 630e376d3688..aed23ca0fa6c 100644
--- a/drivers/media/rc/winbond-cir.c
+++ b/drivers/media/rc/winbond-cir.c
@@ -354,7 +354,6 @@ wbcir_irq_rx(struct wbcir_data *data, struct pnp_dev *device)
 {
 	u8 irdata;
 	struct ir_raw_event rawir = {};
-	unsigned duration;
 
 	/* Since RXHDLEV is set, at least 8 bytes are in the FIFO */
 	while (inb(data->sbase + WBCIR_REG_SP3_LSR) & WBCIR_RX_AVAIL) {
@@ -362,13 +361,12 @@ wbcir_irq_rx(struct wbcir_data *data, struct pnp_dev *device)
 		if (data->rxstate == WBCIR_RXSTATE_ERROR)
 			continue;
 
-		duration = ((irdata & 0x7F) + 1) *
+		rawir.duration = ((irdata & 0x7F) + 1) *
 			(data->carrier_report_enabled ? 2 : 10);
 		rawir.pulse = irdata & 0x80 ? false : true;
-		rawir.duration = US_TO_NS(duration);
 
 		if (rawir.pulse)
-			data->pulse_duration += duration;
+			data->pulse_duration += rawir.duration;
 
 		ir_raw_event_store_with_filter(data->dev, &rawir);
 	}
@@ -519,7 +517,7 @@ wbcir_set_carrier_report(struct rc_dev *dev, int enable)
 
 	/* Set a higher sampling resolution if carrier reports are enabled */
 	wbcir_select_bank(data, WBCIR_BANK_2);
-	data->dev->rx_resolution = US_TO_NS(enable ? 2 : 10);
+	data->dev->rx_resolution = enable ? 2 : 10;
 	outb(enable ? 0x03 : 0x0f, data->sbase + WBCIR_REG_SP3_BGDL);
 	outb(0x00, data->sbase + WBCIR_REG_SP3_BGDH);
 
@@ -1076,7 +1074,7 @@ wbcir_probe(struct pnp_dev *device, const struct pnp_device_id *dev_id)
 	data->dev->min_timeout = 1;
 	data->dev->timeout = IR_DEFAULT_TIMEOUT;
 	data->dev->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
-	data->dev->rx_resolution = US_TO_NS(2);
+	data->dev->rx_resolution = 2;
 	data->dev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
 	data->dev->allowed_wakeup_protocols = RC_PROTO_BIT_NEC |
 		RC_PROTO_BIT_NECX | RC_PROTO_BIT_NEC32 | RC_PROTO_BIT_RC5 |