drm/amdgpu: mmVM_L2_CNTL3 register not initialized correctly

stable inclusion
from stable-v5.10.143
commit dfb27648eea5a5729b544198c1867887fe9420c6
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6D0U6

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=dfb27648eea5a5729b544198c1867887fe9420c6

--------------------------------

[ Upstream commit b8983d42 ]

The mmVM_L2_CNTL3 register is not assigned an initial value
Signed-off-by: NQu Huang <jinsdb@126.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NJialin Zhang <zhangjialin11@huawei.com>
Reviewed-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c

@@ -178,6 +178,7 @@ static void mmhub_v1_0_init_cache_regs(struct amdgpu_device *adev)
 	tmp = REG_SET_FIELD(tmp, VM_L2_CNTL2, INVALIDATE_L2_CACHE, 1);
 	WREG32_SOC15(MMHUB, 0, mmVM_L2_CNTL2, tmp);
 
+	tmp = mmVM_L2_CNTL3_DEFAULT;
 	if (adev->gmc.translate_further) {
 		tmp = REG_SET_FIELD(tmp, VM_L2_CNTL3, BANK_SELECT, 12);
 		tmp = REG_SET_FIELD(tmp, VM_L2_CNTL3,