From: changzhu <[email protected]>

It needs to add warning to update firmware in gfx9
in case that firmware is too old to have function to
realize dummy read in cp firmware.

Change-Id: I6aef94f0823138f244f1eedb62fde833dd697023
Signed-off-by: changzhu <[email protected]>
---
 drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c 
b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
index 9d5f900e3e1c..f2deb225c8a9 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
@@ -982,6 +982,13 @@ static void gfx_v9_0_check_fw_write_wait(struct 
amdgpu_device *adev)
        adev->gfx.me_fw_write_wait = false;
        adev->gfx.mec_fw_write_wait = false;
 
+       if ((adev->gfx.mec_fw_version < 0x000001a5) ||
+           (adev->gfx.mec_feature_version < 46) ||
+           (adev->gfx.pfp_fw_version < 0x000000b7) ||
+           (adev->gfx.pfp_feature_version < 46))
+               DRM_WARN_ONCE("Warning: check cp_fw_version and update it to 
realize \
+                                               GRBM requires 1-cycle delay in 
cp firmware\n");
+
        switch (adev->asic_type) {
        case CHIP_VEGA10:
                if ((adev->gfx.me_fw_version >= 0x0000009c) &&
-- 
2.17.1

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