target/linux/s3c24xx/patches-2.6.26/1141-fix-motion-sensor-corruption.patch.patch

   1 From 18a3bda7bf72a36c3e3164402cd0e4dfa2ff4687 Mon Sep 17 00:00:00 2001
   2 From: Andy Green <agreen@localhost.localdomain>
   3 Date: Fri, 25 Jul 2008 23:06:09 +0100
   4 Subject: [PATCH] fix-motion-sensor-corruption.patch
   5
   6 ---
   7  arch/arm/mach-s3c2440/mach-gta02.c |   35 ++++++++++++++++++++++++++++++++---
   8  1 files changed, 32 insertions(+), 3 deletions(-)
   9
  10 diff --git a/arch/arm/mach-s3c2440/mach-gta02.c b/arch/arm/mach-s3c2440/mach-gta02.c
  11 index e1984a9..9e8fae7 100644
  12 --- a/arch/arm/mach-s3c2440/mach-gta02.c
  13 +++ b/arch/arm/mach-s3c2440/mach-gta02.c
  14 @@ -905,31 +905,58 @@ static struct platform_device gta02_vibrator_dev = {
  15  /* #define DEBUG_SPEW_MS */
  16  #define MG_PER_SAMPLE 18
  17
  18 +struct lis302dl_platform_data lis302_pdata[];
  19 +
  20  void gat02_lis302dl_bitbang_read(struct lis302dl_info *lis)
  21  {
  22         struct lis302dl_platform_data *pdata = lis->pdata;
  23         u8 shifter = 0xc0 | LIS302DL_REG_OUT_X; /* read, autoincrement */
  24         int n, n1;
  25 +       unsigned long other_cs;
  26         unsigned long flags;
  27  #ifdef DEBUG_SPEW_MS
  28         s8 x, y, z;
  29  #endif
  30
  31 -       spin_lock_irqsave(&motion_irq_lock, flags);
  32 +       local_save_flags(flags);
  33 +
  34 +       /*
  35 +        * Huh.. "quirk"... CS on this device is not really "CS" like you can
  36 +        * expect.  Instead when 1 it selects I2C interface mode.  Because we
  37 +        * have 2 devices on one interface, the "disabled" device when we talk
  38 +        * to an "enabled" device sees the clocks as I2C clocks, creating
  39 +        * havoc.
  40 +        * I2C sees MOSI going LOW while CLK HIGH as a START action, we must
  41 +        * ensure this is never issued.
  42 +        */
  43 +
  44 +       if (&lis302_pdata[0] == pdata)
  45 +               other_cs = lis302_pdata[1].pin_chip_select;
  46 +       else
  47 +               other_cs = lis302_pdata[0].pin_chip_select;
  48 +
  49 +       s3c2410_gpio_setpin(other_cs, 1);
  50 +       s3c2410_gpio_setpin(pdata->pin_chip_select, 1);
  51 +       s3c2410_gpio_setpin(pdata->pin_clk, 1);
  52         s3c2410_gpio_setpin(pdata->pin_chip_select, 0);
  53         for (n = 0; n < 8; n++) { /* write the r/w, inc and address */
  54                 s3c2410_gpio_setpin(pdata->pin_clk, 0);
  55                 s3c2410_gpio_setpin(pdata->pin_mosi, (shifter >> 7) & 1);
  56 +               s3c2410_gpio_setpin(pdata->pin_clk, 0);
  57 +               s3c2410_gpio_setpin(pdata->pin_clk, 1);
  58                 s3c2410_gpio_setpin(pdata->pin_clk, 1);
  59                 shifter <<= 1;
  60         }
  61 +
  62         for (n = 0; n < 5; n++) { /* 5 consequetive registers */
  63                 for (n1 = 0; n1 < 8; n1++) { /* 8 bits each */
  64                         s3c2410_gpio_setpin(pdata->pin_clk, 0);
  65 -                       s3c2410_gpio_setpin(pdata->pin_clk, 1);
  66 +                       s3c2410_gpio_setpin(pdata->pin_clk, 0);
  67                         shifter <<= 1;
  68                         if (s3c2410_gpio_getpin(pdata->pin_miso))
  69                                 shifter |= 1;
  70 +                       s3c2410_gpio_setpin(pdata->pin_clk, 1);
  71 +                       s3c2410_gpio_setpin(pdata->pin_clk, 1);
  72                 }
  73                 switch (n) {
  74                 case 0:
  75 @@ -953,7 +980,9 @@ void gat02_lis302dl_bitbang_read(struct lis302dl_info *lis)
  76                 }
  77         }
  78         s3c2410_gpio_setpin(pdata->pin_chip_select, 1);
  79 -       spin_unlock_irqrestore(&motion_irq_lock, flags);
  80 +       s3c2410_gpio_setpin(other_cs, 1);
  81 +       local_irq_restore(flags);
  82 +
  83         input_sync(lis->input_dev);
  84  #ifdef DEBUG_SPEW_MS
  85         printk("%s: %d %d %d\n", pdata->name, x, y, z);
  86 --
  87 1.5.6.3
  88