drivers/gpu/drm/radeon/radeon_acpi.c

   1 #include <linux/pci.h>
   2 #include <linux/acpi.h>
   3 #include <linux/slab.h>
   4 #include <acpi/acpi_drivers.h>
   5 #include <acpi/acpi_bus.h>
   6
   7 #include "drmP.h"
   8 #include "drm.h"
   9 #include "drm_sarea.h"
  10 #include "drm_crtc_helper.h"
  11 #include "radeon.h"
  12
  13 #include <linux/vga_switcheroo.h>
  14
  15 /* Call the ATIF method
  16  *
  17  * Note: currently we discard the output
  18  */
  19 static int radeon_atif_call(acpi_handle handle)
  20 {
  21         acpi_status status;
  22         union acpi_object atif_arg_elements[2];
  23         struct acpi_object_list atif_arg;
  24         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
  25
  26         atif_arg.count = 2;
  27         atif_arg.pointer = &atif_arg_elements[0];
  28
  29         atif_arg_elements[0].type = ACPI_TYPE_INTEGER;
  30         atif_arg_elements[0].integer.value = 0;
  31         atif_arg_elements[1].type = ACPI_TYPE_INTEGER;
  32         atif_arg_elements[1].integer.value = 0;
  33
  34         status = acpi_evaluate_object(handle, "ATIF", &atif_arg, &buffer);
  35
  36         /* Fail only if calling the method fails and ATIF is supported */
  37         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
  38                 DRM_DEBUG_DRIVER("failed to evaluate ATIF got %s\n",
  39                                  acpi_format_exception(status));
  40                 kfree(buffer.pointer);
  41                 return 1;
  42         }
  43
  44         kfree(buffer.pointer);
  45         return 0;
  46 }
  47
  48 /* Call all ACPI methods here */
  49 int radeon_acpi_init(struct radeon_device *rdev)
  50 {
  51         acpi_handle handle;
  52         int ret;
  53
  54         /* No need to proceed if we're sure that ATIF is not supported */
  55         if (!ASIC_IS_AVIVO(rdev) || !rdev->bios)
  56                 return 0;
  57
  58         /* Get the device handle */
  59         handle = DEVICE_ACPI_HANDLE(&rdev->pdev->dev);
  60
  61         /* Call the ATIF method */
  62         ret = radeon_atif_call(handle);
  63         if (ret)
  64                 return ret;
  65
  66         return 0;
  67 }
  68