[PATCH 3/6] drm/amdgpu/cik: add need_reset_on_init asic callback for CIK (v2)

[Alex Deucher]

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

v2: rebase

Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/cik.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/cik.c b/drivers/gpu/drm/amd/amdgpu/cik.c
index 71c50d8900e3..09dfaff63502 100644
--- a/drivers/gpu/drm/amd/amdgpu/cik.c
+++ b/drivers/gpu/drm/amd/amdgpu/cik.c
@@ -1741,6 +1741,23 @@ static bool cik_need_full_reset(struct amdgpu_device *adev)
 	return true;
 }
 
+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,
@@ -1756,6 +1773,7 @@ static const struct amdgpu_asic_funcs cik_asic_funcs =
 	.invalidate_hdp = &cik_invalidate_hdp,
 	.need_full_reset = &cik_need_full_reset,
 	.init_doorbell_index = &legacy_doorbell_index_init,
+	.need_reset_on_init = &cik_need_reset_on_init,
 };
 
 static int cik_common_early_init(void *handle)
-- 
2.20.1