src/patches/suse-2.6.27.25/patches.arch/acpi_ec_provide_non_interrupt_mode_boot_param.patch

   1 From: Alexey Starikovskiy <astarikovskiy@suse.de>
   2 Subject: ACPI: EC: Don't degrade to poll mode at storm automatically.
   3 References: bnc#446142
   4 Patch-Mainline: no
   5
   6 Signed-off-by: Thomas Renninger <trenn@suse.de>
   7
   8 Not all users of semi-broken EC devices want to degrade to poll mode, so
   9 give them right to choose.
  10
  11 Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
  12 ---
  13
  14  Documentation/kernel-parameters.txt |    5 +++++
  15  drivers/acpi/ec.c                   |   15 +++++++++++++++
  16  2 files changed, 20 insertions(+)
  17
  18
  19 --- a/Documentation/kernel-parameters.txt
  20 +++ b/Documentation/kernel-parameters.txt
  21 @@ -699,6 +699,11 @@ and is between 256 and 4096 characters.
  22
  23         eata=           [HW,SCSI]
  24
  25 +       ec_intr=        [HW,ACPI] ACPI Embedded Controller interrupt mode
  26 +                       Format: <int>
  27 +                       0: polling mode
  28 +                       non-0: interrupt mode (default)
  29 +
  30         edd=            [EDD]
  31                         Format: {"off" | "on" | "skip[mbr]"}
  32
  33 --- a/drivers/acpi/ec.c
  34 +++ b/drivers/acpi/ec.c
  35 @@ -121,6 +121,8 @@ static struct acpi_ec {
  36         spinlock_t curr_lock;
  37  } *boot_ec, *first_ec;
  38
  39 +int acpi_ec_intr = 1; /* Default is interrupt mode */
  40 +
  41  /*
  42   * Some Asus system have exchanged ECDT data/command IO addresses.
  43   */
  44 @@ -902,6 +904,8 @@ static int ec_install_handlers(struct ac
  45                                   &acpi_ec_gpe_handler, ec);
  46         if (ACPI_FAILURE(status))
  47                 return -ENODEV;
  48 +       if (!acpi_ec_intr)
  49 +               set_bit(EC_FLAGS_NO_GPE, &ec->flags);
  50         acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
  51         acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
  52         status = acpi_install_address_space_handler(ec->handle,
  53 @@ -1094,3 +1098,14 @@ static void __exit acpi_ec_exit(void)
  54         return;
  55  }
  56  #endif /* 0 */
  57 +
  58 +static int __init acpi_ec_set_intr_mode(char *str)
  59 +{
  60 +       if (!get_option(&str, &acpi_ec_intr)) {
  61 +               acpi_ec_intr = 0;
  62 +               return 0;
  63 +       }
  64 +       return 1;
  65 +}
  66 +
  67 +__setup("ec_intr=", acpi_ec_set_intr_mode);