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 #include "radeon_acpi.h"
  13
  14 #include <linux/vga_switcheroo.h>
  15
  16 /* Call the ATIF method
  17  *
  18  * Note: currently we discard the output
  19  */
  20 static int radeon_atif_call(acpi_handle handle)
  21 {
  22         acpi_status status;
  23         union acpi_object atif_arg_elements[2];
  24         struct acpi_object_list atif_arg;
  25         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
  26
  27         atif_arg.count = 2;
  28         atif_arg.pointer = &atif_arg_elements[0];
  29
  30         atif_arg_elements[0].type = ACPI_TYPE_INTEGER;
  31         atif_arg_elements[0].integer.value = ATIF_FUNCTION_VERIFY_INTERFACE;
  32         atif_arg_elements[1].type = ACPI_TYPE_INTEGER;
  33         atif_arg_elements[1].integer.value = 0;
  34
  35         status = acpi_evaluate_object(handle, "ATIF", &atif_arg, &buffer);
  36
  37         /* Fail only if calling the method fails and ATIF is supported */
  38         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
  39                 DRM_DEBUG_DRIVER("failed to evaluate ATIF got %s\n",
  40                                  acpi_format_exception(status));
  41                 kfree(buffer.pointer);
  42                 return 1;
  43         }
  44
  45         kfree(buffer.pointer);
  46         return 0;
  47 }
  48
  49 /* Call all ACPI methods here */
  50 int radeon_acpi_init(struct radeon_device *rdev)
  51 {
  52         acpi_handle handle;
  53         int ret;
  54
  55         /* Get the device handle */
  56         handle = DEVICE_ACPI_HANDLE(&rdev->pdev->dev);
  57
  58         /* No need to proceed if we're sure that ATIF is not supported */
  59         if (!ASIC_IS_AVIVO(rdev) || !rdev->bios || !handle)
  60                 return 0;
  61
  62         /* Call the ATIF method */
  63         ret = radeon_atif_call(handle);
  64         if (ret)
  65                 return ret;
  66
  67         return 0;
  68 }
  69