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alistair23-linux/drivers/media/rc
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Joakim Zhang ff1c9223b7 media: rc: gpio-ir-recv: add QoS support for cpuidle system 
GPIO IR receive is much rely on interrupt response, uneven interrupt
latency will lead to incorrect timing, so the decoder fails to decode
it. The issue is particularly acute on some systems which support
cpuidle, not all, dynamically disable and enable cpuidle can solve this
problem to a great extent.

However, there is a downside to this approach, the measurement of header
on the first frame may incorrect. Test on i.MX8M serials, when enable
cpuidle, interrupt latency could be about 500us.

With this patch:
1. has no side effect on non-cpuidle system, even runtime pm api won't
be invoked to avoid a bunch of pm busy work for devices that do not need
it, including spinlocks, ktime, etc.
2. latency is still much longer for the first gpio interrupt on cpuidle
system, so the first frame may not be decoded. Generally, RC would transmit
multiple frames at once press, we can sacrifice the first frame.
3. add "linux,autosuspend-period" property in device tree if you also
suffer this cpuidle issue.

Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
 		2020-09-27 11:27:23 +02:00
..
img-ir media: Remove dev_err() usage after platform_get_irq() 2019-08-07 17:08:33 -03:00
keymaps media: rc: add keymap for Videostrong KII Pro 2020-02-24 16:27:44 +01:00
Kconfig media: rc: add support for Infrared Toy and IR Droid devices 2020-06-23 15:07:21 +02:00
Makefile media: rc: add support for Infrared Toy and IR Droid devices 2020-06-23 15:07:21 +02:00
ati_remote.c media: ati_remote: sanity check for both endpoints 2020-09-27 11:24:07 +02:00
bpf-lirc.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
ene_ir.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
ene_ir.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
fintek-cir.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
fintek-cir.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
gpio-ir-recv.c media: rc: gpio-ir-recv: add QoS support for cpuidle system 2020-09-27 11:27:23 +02:00
gpio-ir-tx.c media: gpio-ir-tx: spinlock is not needed to disable interrupts 2020-08-28 14:06:36 +02:00
igorplugusb.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
iguanair.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
imon.c media: imon: Replace http links with https ones 2020-07-19 14:00:32 +02:00
imon_raw.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
ir-hix5hd2.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
ir-imon-decoder.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
ir-jvc-decoder.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
ir-mce_kbd-decoder.c media: rc: rename ir_lirc_* functions to lirc_* 2020-09-03 16:19:27 +02:00
ir-nec-decoder.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
ir-rc5-decoder.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
ir-rc6-decoder.c Linux 5.9-rc4 2020-09-07 16:13:06 +02:00
ir-rcmm-decoder.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
ir-rx51.c media: ir-rx51: Use 64-bit division macro 2020-04-21 12:57:04 +02:00
ir-sanyo-decoder.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
ir-sharp-decoder.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
ir-sony-decoder.c Linux 5.9-rc4 2020-09-07 16:13:06 +02:00
ir-spi.c media: spi: IR LED: add missing of table registration 2019-05-22 15:27:37 -04:00
ir-xmp-decoder.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
ir_toy.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
ite-cir.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
ite-cir.h media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
lirc_dev.c media: rc: rename ir_lirc_* functions to lirc_* 2020-09-03 16:19:27 +02:00
mceusb.c Linux 5.9-rc4 2020-09-07 16:13:06 +02:00
meson-ir.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
mtk-cir.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
nuvoton-cir.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
nuvoton-cir.h media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
pwm-ir-tx.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 122 2019-05-24 17:39:03 +02:00
rc-core-priv.h media: rc: rename ir_lirc_* functions to lirc_* 2020-09-03 16:19:27 +02:00
rc-ir-raw.c media: rc: rename ir_lirc_* functions to lirc_* 2020-09-03 16:19:27 +02:00
rc-loopback.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
rc-main.c Linux 5.9-rc4 2020-09-07 16:13:06 +02:00
redrat3.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
serial_ir.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
sir_ir.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
st_rc.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
streamzap.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
sunxi-cir.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
tango-ir.c media: rc: Use devm_platform_ioremap_resource() in tango_ir_probe() 2019-10-07 07:44:56 -03:00
ttusbir.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
winbond-cir.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
xbox_remote.c media: rc: harmonize infrared durations to microseconds 2020-09-03 16:18:55 +02:00
zx-irdec.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00