drm/amdgpu/gfx9: enable/disable sck slowdown thru rlc-smu handshake

Required for proper powergating operation.

Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
index 04cd04c..5be4676 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
@@ -1903,6 +1903,44 @@ static void gfx_v9_0_init_gfx_power_gating(struct amdgpu_device *adev)
        }
 }
 
+static void gfx_v9_0_enable_sck_slow_down_on_power_up(struct amdgpu_device *adev,
+                                               bool enable)
+{
+       uint32_t data = 0;
+       uint32_t default_data = 0;
+
+       default_data = data = RREG32(SOC15_REG_OFFSET(GC, 0, mmRLC_PG_CNTL));
+
+       if (enable == true) {
+               data |= RLC_PG_CNTL__SMU_CLK_SLOWDOWN_ON_PU_ENABLE_MASK;
+               if (default_data != data)
+                       WREG32(SOC15_REG_OFFSET(GC, 0, mmRLC_PG_CNTL), data);
+       } else {
+               data &= ~RLC_PG_CNTL__SMU_CLK_SLOWDOWN_ON_PU_ENABLE_MASK;
+               if(default_data != data)
+                       WREG32(SOC15_REG_OFFSET(GC, 0, mmRLC_PG_CNTL), data);
+       }
+}
+
+static void gfx_v9_0_enable_sck_slow_down_on_power_down(struct amdgpu_device *adev,
+                                               bool enable)
+{
+       uint32_t data = 0;
+       uint32_t default_data = 0;
+
+       default_data = data = RREG32(SOC15_REG_OFFSET(GC, 0, mmRLC_PG_CNTL));
+
+       if (enable == true) {
+               data |= RLC_PG_CNTL__SMU_CLK_SLOWDOWN_ON_PD_ENABLE_MASK;
+               if(default_data != data)
+                       WREG32(SOC15_REG_OFFSET(GC, 0, mmRLC_PG_CNTL), data);
+       } else {
+               data &= ~RLC_PG_CNTL__SMU_CLK_SLOWDOWN_ON_PD_ENABLE_MASK;
+               if(default_data != data)
+                       WREG32(SOC15_REG_OFFSET(GC, 0, mmRLC_PG_CNTL), data);
+       }
+}
+
 static void gfx_v9_0_init_pg(struct amdgpu_device *adev)
 {
        if (adev->pg_flags & (AMD_PG_SUPPORT_GFX_PG |
@@ -1919,6 +1957,13 @@ static void gfx_v9_0_init_pg(struct amdgpu_device *adev)
                        WREG32(mmRLC_JUMP_TABLE_RESTORE,
                                adev->gfx.rlc.cp_table_gpu_addr >> 8);
                        gfx_v9_0_init_gfx_power_gating(adev);
+                       if (adev->pg_flags & AMD_PG_SUPPORT_RLC_SMU_HS) {
+                               gfx_v9_0_enable_sck_slow_down_on_power_up(adev, true);
+                               gfx_v9_0_enable_sck_slow_down_on_power_down(adev, true);
+                       } else {
+                               gfx_v9_0_enable_sck_slow_down_on_power_up(adev, false);
+                               gfx_v9_0_enable_sck_slow_down_on_power_down(adev, false);
+                       }
                }
        }
 }