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100 lines
3.1 KiB
100 lines
3.1 KiB
From fd945928d6fd544d2f4bdde718b097b01bafb048 Mon Sep 17 00:00:00 2001
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From: popcornmix <popcornmix@gmail.com>
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Date: Tue, 22 Apr 2014 13:58:14 +0100
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Subject: [PATCH 194/196] lirc_rpi: Use read_current_timer to determine
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transmitter delay. Thanks to jjmz and others See:
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https://github.com/raspberrypi/linux/issues/525
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---
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drivers/staging/media/lirc/lirc_rpi.c | 32 +++++++++++++++++---------------
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1 file changed, 17 insertions(+), 15 deletions(-)
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diff --git a/drivers/staging/media/lirc/lirc_rpi.c b/drivers/staging/media/lirc/lirc_rpi.c
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index 8aee83f..57ffacf 100644
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--- a/drivers/staging/media/lirc/lirc_rpi.c
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+++ b/drivers/staging/media/lirc/lirc_rpi.c
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@@ -30,6 +30,7 @@
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/time.h>
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+#include <linux/timex.h>
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#include <linux/string.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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@@ -41,7 +42,7 @@
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#define LIRC_DRIVER_NAME "lirc_rpi"
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#define RBUF_LEN 256
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-#define LIRC_TRANSMITTER_LATENCY 256
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+#define LIRC_TRANSMITTER_LATENCY 50
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#ifndef MAX_UDELAY_MS
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#define MAX_UDELAY_US 5000
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@@ -107,19 +108,15 @@ static void safe_udelay(unsigned long usecs)
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static int init_timing_params(unsigned int new_duty_cycle,
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unsigned int new_freq)
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{
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- /*
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- * period, pulse/space width are kept with 8 binary places -
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- * IE multiplied by 256.
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- */
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- if (256 * 1000000L / new_freq * new_duty_cycle / 100 <=
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+ if (1000 * 1000000L / new_freq * new_duty_cycle / 100 <=
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LIRC_TRANSMITTER_LATENCY)
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return -EINVAL;
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- if (256 * 1000000L / new_freq * (100 - new_duty_cycle) / 100 <=
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+ if (1000 * 1000000L / new_freq * (100 - new_duty_cycle) / 100 <=
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LIRC_TRANSMITTER_LATENCY)
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return -EINVAL;
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duty_cycle = new_duty_cycle;
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freq = new_freq;
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- period = 256 * 1000000L / freq;
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+ period = 1000 * 1000000L / freq;
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pulse_width = period * duty_cycle / 100;
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space_width = period - pulse_width;
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dprintk("in init_timing_params, freq=%d pulse=%ld, "
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@@ -130,11 +127,14 @@ static int init_timing_params(unsigned int new_duty_cycle,
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static long send_pulse_softcarrier(unsigned long length)
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{
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int flag;
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- unsigned long actual, target, d;
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+ unsigned long actual, target;
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+ unsigned long actual_us, initial_us, target_us;
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- length <<= 8;
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+ length *= 1000;
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actual = 0; target = 0; flag = 0;
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+ read_current_timer(&actual_us);
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+
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while (actual < length) {
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if (flag) {
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gpiochip->set(gpiochip, gpio_out_pin, invert);
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@@ -143,17 +143,19 @@ static long send_pulse_softcarrier(unsigned long length)
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gpiochip->set(gpiochip, gpio_out_pin, !invert);
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target += pulse_width;
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}
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- d = (target - actual -
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- LIRC_TRANSMITTER_LATENCY + 128) >> 8;
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+ initial_us = actual_us;
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+ target_us = actual_us + (target - actual) / 1000;
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/*
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* Note - we've checked in ioctl that the pulse/space
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* widths are big enough so that d is > 0
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*/
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- udelay(d);
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- actual += (d << 8) + LIRC_TRANSMITTER_LATENCY;
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+ if ((int)(target_us - actual_us) > 0)
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+ udelay(target_us - actual_us);
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+ read_current_timer(&actual_us);
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+ actual += (actual_us - initial_us) * 1000;
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flag = !flag;
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}
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- return (actual-length) >> 8;
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+ return (actual-length) / 1000;
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}
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static long send_pulse(unsigned long length)
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--
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1.9.1
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