drm/amdgpu/sdma4: add dynamic power gating for raven

Add the functions to enable dynamic powergating.

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

diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c b/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
index 3d24e50..e4825a3 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
@@ -669,6 +669,27 @@ static int sdma_v4_0_gfx_resume(struct amdgpu_device *adev)
        return 0;
 }
 
+static void
+sdma_v4_1_update_power_gating(struct amdgpu_device *adev, bool enable)
+{
+       uint32_t def, data;
+
+       if (enable && (adev->pg_flags & AMD_PG_SUPPORT_SDMA)) {
+               /* disable idle interrupt */
+               def = data = RREG32(SOC15_REG_OFFSET(SDMA0, 0, mmSDMA0_CNTL));
+               data |= SDMA0_CNTL__CTXEMPTY_INT_ENABLE_MASK;
+
+               if (data != def)
+                       WREG32(SOC15_REG_OFFSET(SDMA0, 0, mmSDMA0_CNTL), data);
+       } else {
+               /* disable idle interrupt */
+               def = data = RREG32(SOC15_REG_OFFSET(SDMA0, 0, mmSDMA0_CNTL));
+               data &= ~SDMA0_CNTL__CTXEMPTY_INT_ENABLE_MASK;
+               if (data != def)
+                       WREG32(SOC15_REG_OFFSET(SDMA0, 0, mmSDMA0_CNTL), data);
+       }
+}
+
 static void sdma_v4_1_init_power_gating(struct amdgpu_device *adev)
 {
        uint32_t def, data;
@@ -704,6 +725,7 @@ static void sdma_v4_0_init_pg(struct amdgpu_device *adev)
        switch (adev->asic_type) {
        case CHIP_RAVEN:
                sdma_v4_1_init_power_gating(adev);
+               sdma_v4_1_update_power_gating(adev, true);
                break;
        default:
                break;
@@ -1502,6 +1524,17 @@ static int sdma_v4_0_set_clockgating_state(void *handle,
 static int sdma_v4_0_set_powergating_state(void *handle,
                                          enum amd_powergating_state state)
 {
+       struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+       switch (adev->asic_type) {
+       case CHIP_RAVEN:
+               sdma_v4_1_update_power_gating(adev,
+                               state == AMD_PG_STATE_GATE ? true : false);
+               break;
+       default:
+               break;
+       }
+
        return 0;
 }