target/linux/brcm2708/patches-4.4/0429-fix-auto-sense-in-lirc_rpi-driver.patch

   1 From 7e5bbf1a74ec6bbaa25fe6cadf715946e3e4d692 Mon Sep 17 00:00:00 2001
   2 From: Ingo Kresse <ingo.kresse@gmail.com>
   3 Date: Fri, 29 Jul 2016 22:50:21 +0000
   4 Subject: [PATCH] fix auto-sense in lirc_rpi driver
   5
   6 On a Raspberry Pi 2, the lirc_rpi driver might receive spurious
   7 interrupts and change it's low-active / high-active setting.
   8 When this happens, the IR remote control stops working.
   9
  10 This patch disables this auto-detection if the 'sense' parameter
  11 was set in the device tree, making the driver robust to such
  12 spurious interrupts.
  13 ---
  14  drivers/staging/media/lirc/lirc_rpi.c | 6 +++++-
  15  1 file changed, 5 insertions(+), 1 deletion(-)
  16
  17 --- a/drivers/staging/media/lirc/lirc_rpi.c
  18 +++ b/drivers/staging/media/lirc/lirc_rpi.c
  19 @@ -79,6 +79,7 @@ static bool invert = 0;
  20
  21  struct gpio_chip *gpiochip;
  22  static int irq_num;
  23 +static int auto_sense = 1;
  24
  25  /* forward declarations */
  26  static long send_pulse(unsigned long length);
  27 @@ -279,7 +280,9 @@ static irqreturn_t irq_handler(int i, vo
  28                                  * detecting pulse while this
  29                                  * MUST be a space!
  30                                  */
  31 -                               sense = sense ? 0 : 1;
  32 +                               if (auto_sense) {
  33 +                                       sense = sense ? 0 : 1;
  34 +                               }
  35                         }
  36                 } else {
  37                         data = (int) (deltv*1000000 +
  38 @@ -417,6 +420,7 @@ static int init_port(void)
  39                 printk(KERN_INFO LIRC_DRIVER_NAME
  40                        ": manually using active %s receiver on GPIO pin %d\n",
  41                        sense ? "low" : "high", gpio_in_pin);
  42 +               auto_sense = 0;
  43         }
  44
  45         return 0;