target/linux/s3c24xx/patches-2.6.26/1103-Fix-the-firing-of-Jack-Interrupts-after-resume-whe.patch

   1 From 081f2aa16800b186e0cfde52f41afa805a3d53c2 Mon Sep 17 00:00:00 2001
   2 From: Holger Freyther <zecke@openmoko.org>
   3 Date: Fri, 25 Jul 2008 23:06:04 +0100
   4 Subject: [PATCH] Fix the firing of "Jack"-Interrupts after resume when the modem is powered on.
   5
   6 GTA02_GPIO_nDL_GSM defaults to high/1. On resume do not enable the DL_GSM if
   7 it was not enabled before. This is stopping the storm of interrupts.
   8
   9 Fix the logic in the download file handling. Downloads are disabled (0) when
  10 the GTA02_GPIO_nDL_GSM is high (1). To enable downloading set
  11 GTA02_GPIO_nDL_GSM to low (0, !on). Disable the jack interrupt while download
  12 the is active. When disabling download we will get a couple of jack interrupts
  13 but this is hardly avoidable.
  14
  15 Avoid reading the GPIO value if we do not even have a console set.
  16
  17 Signed-Off-by: Holger Freyther <zecke@openmoko.org>
  18 ---
  19  arch/arm/plat-s3c24xx/neo1973_pm_gsm.c |   35 +++++++++++++++++++++++--------
  20  1 files changed, 26 insertions(+), 9 deletions(-)
  21
  22 diff --git a/arch/arm/plat-s3c24xx/neo1973_pm_gsm.c b/arch/arm/plat-s3c24xx/neo1973_pm_gsm.c
  23 index 1123d7d..b4ea8ba 100644
  24 --- a/arch/arm/plat-s3c24xx/neo1973_pm_gsm.c
  25 +++ b/arch/arm/plat-s3c24xx/neo1973_pm_gsm.c
  26 @@ -17,8 +17,9 @@
  27  #include <linux/platform_device.h>
  28  #include <linux/console.h>
  29  #include <linux/errno.h>
  30 +#include <linux/interrupt.h>
  31
  32 -#include <asm/hardware.h>
  33 +#include <asm/gpio.h>
  34  #include <asm/mach-types.h>
  35  #include <asm/arch/gta01.h>
  36
  37 @@ -30,6 +31,7 @@
  38
  39  struct gta01pm_priv {
  40         int gpio_ngsm_en;
  41 +        int gpio_ndl_gsm;
  42         struct console *con;
  43  };
  44
  45 @@ -68,7 +70,7 @@ static ssize_t gsm_read(struct device *dev, struct device_attribute *attr,
  46  #endif
  47  #ifdef CONFIG_MACH_NEO1973_GTA02
  48                 if (machine_is_neo1973_gta02())
  49 -                       if (s3c2410_gpio_getpin(GTA02_GPIO_nDL_GSM))
  50 +                       if (!s3c2410_gpio_getpin(GTA02_GPIO_nDL_GSM))
  51                                 goto out_1;
  52  #endif
  53         }
  54 @@ -143,8 +145,18 @@ static ssize_t gsm_write(struct device *dev, struct device_attribute *attr,
  55                         s3c2410_gpio_setpin(GTA01_GPIO_MODEM_DNLOAD, on);
  56  #endif
  57  #ifdef CONFIG_MACH_NEO1973_GTA02
  58 -               if (machine_is_neo1973_gta02())
  59 -                       s3c2410_gpio_setpin(GTA02_GPIO_nDL_GSM, on);
  60 +               if (machine_is_neo1973_gta02()) {
  61 +                       /* FIXME: Layering violation, we know how this relates to
  62 +                        * the Jack-IRQ. And we assume the keyboard driver to be
  63 +                        * around. */
  64 +                       if (on)
  65 +                           disable_irq(gpio_to_irq(GTA02_GPIO_JACK_INSERT));
  66 +                       else
  67 +                           enable_irq(gpio_to_irq(GTA02_GPIO_JACK_INSERT));
  68 +
  69 +                       gta01_gsm.gpio_ndl_gsm = !on;
  70 +                       s3c2410_gpio_setpin(GTA02_GPIO_nDL_GSM, !on);
  71 +               }
  72  #endif
  73         }
  74
  75 @@ -159,26 +171,29 @@ static DEVICE_ATTR(download, 0644, gsm_read, gsm_write);
  76  static int gta01_gsm_suspend(struct platform_device *pdev, pm_message_t state)
  77  {
  78         /* GPIO state is saved/restored by S3C2410 core GPIO driver, so we
  79 -        * don't need to do anything here */
  80 +        * don't need to do much here. */
  81 +
  82
  83 -       /* disable DL GSM to prevent jack_insert becoming floating */
  84 +       /* disable DL GSM to prevent jack_insert becoming 'floating' */
  85         if (machine_is_neo1973_gta02())
  86                 s3c2410_gpio_setpin(GTA02_GPIO_nDL_GSM, 1);
  87 +
  88         return 0;
  89  }
  90
  91  static int gta01_gsm_resume(struct platform_device *pdev)
  92  {
  93         /* GPIO state is saved/restored by S3C2410 core GPIO driver, so we
  94 -        * don't need to do anything here */
  95 +        * don't need to do much here. */
  96
  97         /* Make sure that the kernel console on the serial port is still
  98          * disabled. FIXME: resume ordering race with serial driver! */
  99 -       if (s3c2410_gpio_getpin(GTA01_GPIO_MODEM_ON) && gta01_gsm.con)
 100 +       if (gta01_gsm.con && s3c2410_gpio_getpin(GTA01_GPIO_MODEM_ON))
 101                 console_stop(gta01_gsm.con);
 102
 103         if (machine_is_neo1973_gta02())
 104 -               s3c2410_gpio_setpin(GTA02_GPIO_nDL_GSM, 0);
 105 +               s3c2410_gpio_setpin(GTA02_GPIO_nDL_GSM, gta01_gsm.gpio_ndl_gsm);
 106 +
 107         return 0;
 108  }
 109  #else
 110 @@ -248,6 +263,8 @@ static int __init gta01_gsm_probe(struct platform_device *pdev)
 111         } else
 112                 gta01_gsm.con = NULL;
 113
 114 +       gta01_gsm.gpio_ndl_gsm = 1;
 115 +
 116         return sysfs_create_group(&pdev->dev.kobj, &gta01_gsm_attr_group);
 117  }
 118
 119 --
 120 1.5.6.3
 121