drm/amdgpu/cik: add need_reset_on_init asic callback for CIK (v2)

CIK 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>

1 files changed, 18 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/cik.c b/drivers/gpu/drm/amd/amdgpu/cik.c
index 6277de51483f..b1b7abed7dab 100644
--- a/drivers/gpu/drm/amd/amdgpu/cik.c
+++ b/drivers/gpu/drm/amd/amdgpu/cik.c
@@ -1787,6 +1787,23 @@ static void cik_get_pcie_usage(struct amdgpu_device *adev, uint64_t *count0,
         *count1 = RREG32_PCIE(ixPCIE_PERF_COUNT1_TXCLK) | (cnt1_of << 32);
 }
 
+static bool cik_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 cik_asic_funcs =
 {
         .read_disabled_bios = &cik_read_disabled_bios,
@@ -1803,6 +1820,7 @@ static const struct amdgpu_asic_funcs cik_asic_funcs =
         .need_full_reset = &cik_need_full_reset,
         .init_doorbell_index = &legacy_doorbell_index_init,
         .get_pcie_usage = &cik_get_pcie_usage,
+        .need_reset_on_init = &cik_need_reset_on_init,
 };
 
 static int cik_common_early_init(void *handle)