drm/amdgpu/vi: add need_reset_on_init asic callback for VI (v2)

VI chips require a reset if the driver was previously loaded
because the SMU can only be loaded once between each reset.

v2: rebase
Reviewed-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -987,6 +987,23 @@ static void vi_get_pcie_usage(struct amdgpu_device *adev, uint64_t *count0,
 	*count1 = RREG32_PCIE(ixPCIE_PERF_COUNT1_TXCLK) | (cnt1_of << 32);
 }
 
+static bool vi_need_reset_on_init(struct amdgpu_device *adev)
+{
+	u32 clock_cntl, pc;
+
+	if (adev->flags & AMD_IS_APU)
+		return false;
+
+	/* check if the SMC is already running */
+	clock_cntl = RREG32_SMC(ixSMC_SYSCON_CLOCK_CNTL_0);
+	pc = RREG32_SMC(ixSMC_PC_C);
+	if ((0 == REG_GET_FIELD(clock_cntl, SMC_SYSCON_CLOCK_CNTL_0, ck_disable)) &&
+	    (0x20100 <= pc))
+		return true;
+
+	return false;
+}
+
 static const struct amdgpu_asic_funcs vi_asic_funcs =
 {
 	.read_disabled_bios = &vi_read_disabled_bios,
@@ -1003,6 +1020,7 @@ static const struct amdgpu_asic_funcs vi_asic_funcs =
 	.need_full_reset = &vi_need_full_reset,
 	.init_doorbell_index = &legacy_doorbell_index_init,
 	.get_pcie_usage = &vi_get_pcie_usage,
+	.need_reset_on_init = &vi_need_reset_on_init,
 };
 
 #define CZ_REV_BRISTOL(rev)	 \