drm/amdgpu: add warning for GRBM 1-cycle delay issue in gfx9

[ Upstream commit 440a7a54e7ec012ec8b27c27e460dfd6f9a24ddb ]

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.

Signed-off-by: changzhu <Changfeng.Zhu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
index 75faa56f243a4094c8985a6597ef8a42ecc87b4d..b1388d3e72f740216dc702b1162a90c708dde1dd 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
@@ -538,6 +538,13 @@ 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) &&