drm/amdgpu:fix vpost_needed routine

1,cleanup description/comments
2,for FIJI & passthrough, force post when smc fw version below 22.15
3,for other cases, follow regular rules

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 7ca07e7..3161d77 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -658,12 +658,10 @@ static bool amdgpu_vpost_needed(struct amdgpu_device *adev)
                return false;
 
        if (amdgpu_passthrough(adev)) {
-               /* for FIJI: In whole GPU pass-through virtualization case
-                * old smc fw won't clear some registers (e.g. MEM_SIZE, BIOS_SCRATCH)
-                * so amdgpu_card_posted return false and driver will incorrectly skip vPost.
-                * but if we force vPost do in pass-through case, the driver reload will hang.
-                * whether doing vPost depends on amdgpu_card_posted if smc version is above
-                * 00160e00 for FIJI.
+               /* for FIJI: In whole GPU pass-through virtualization case, after VM reboot
+                * some old smc fw still need driver do vPost otherwise gpu hang, while
+                * those smc fw version above 22.15 doesn't have this flaw, so we force
+                * vpost executed for smc version below 22.15
                 */
                if (adev->asic_type == CHIP_FIJI) {
                        int err;
@@ -674,22 +672,11 @@ static bool amdgpu_vpost_needed(struct amdgpu_device *adev)
                                return true;
 
                        fw_ver = *((uint32_t *)adev->pm.fw->data + 69);
-                       if (fw_ver >= 0x00160e00)
-                               return !amdgpu_card_posted(adev);
+                       if (fw_ver < 0x00160e00)
+                               return true;
                }
-       } else {
-               /* in bare-metal case, amdgpu_card_posted return false
-                * after system reboot/boot, and return true if driver
-                * reloaded.
-                * we shouldn't do vPost after driver reload otherwise GPU
-                * could hang.
-                */
-               if (amdgpu_card_posted(adev))
-                       return false;
        }
-
-       /* we assume vPost is neede for all other cases */
-       return true;
+       return !amdgpu_card_posted(adev);
 }
 
 /**