amdgpu: detect if we are using atomfirmware or atombios for vbios (v2)

Supposedly atomfirmware rom header is 3.3 atombios is 1.1.

v2: rebased on newer kernel

Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

2 files changed, 24 insertions, 7 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index a17a54fc8f27..2790129c0b76 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1308,6 +1308,7 @@ struct amdgpu_device {
         bool                            have_disp_power_ref;
 
         /* BIOS */
+        bool                            is_atom_fw;
         uint8_t                         *bios;
         uint32_t                        bios_size;
         struct amdgpu_bo                *stollen_vga_memory;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c
index 821f7cc2051f..365e735f6647 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c
@@ -86,6 +86,18 @@ static bool check_atom_bios(uint8_t *bios, size_t size)
         return false;
 }
 
+static bool is_atom_fw(uint8_t *bios)
+{
+        uint16_t bios_header_start = bios[0x48] | (bios[0x49] << 8);
+        uint8_t frev = bios[bios_header_start + 2];
+        uint8_t crev = bios[bios_header_start + 3];
+
+        if ((frev < 3) ||
+            ((frev == 3) && (crev < 3)))
+                return false;
+
+        return true;
+}
 
 /* If you boot an IGP board with a discrete card as the primary,
  * the IGP rom is not accessible via the rom bar as the IGP rom is
@@ -419,26 +431,30 @@ static inline bool amdgpu_acpi_vfct_bios(struct amdgpu_device *adev)
 bool amdgpu_get_bios(struct amdgpu_device *adev)
 {
         if (amdgpu_atrm_get_bios(adev))
-                return true;
+                goto success;
 
         if (amdgpu_acpi_vfct_bios(adev))
-                return true;
+                goto success;
 
         if (igp_read_bios_from_vram(adev))
-                return true;
+                goto success;
 
         if (amdgpu_read_bios(adev))
-                return true;
+                goto success;
 
         if (amdgpu_read_bios_from_rom(adev))
-                return true;
+                goto success;
 
         if (amdgpu_read_disabled_bios(adev))
-                return true;
+                goto success;
 
         if (amdgpu_read_platform_bios(adev))
-                return true;
+                goto success;
 
         DRM_ERROR("Unable to locate a BIOS ROM\n");
         return false;
+
+success:
+        adev->is_atom_fw = is_atom_fw(adev->bios);
+        return true;
 }