drm/amd/powerplay: add override pcie parameters for Vega20

It is to solve RDMA performance issue.

Signed-off-by: Eric Huang <JinhuiEric.Huang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/vega20_hwmgr.c b/drivers/gpu/drm/amd/powerplay/hwmgr/vega20_hwmgr.c
index 7b49a9a..da022ca 100644 (file)
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/vega20_hwmgr.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/vega20_hwmgr.c
@@ -771,6 +771,47 @@ static int vega20_init_smc_table(struct pp_hwmgr *hwmgr)
        return 0;
 }
 
+static int vega20_override_pcie_parameters(struct pp_hwmgr *hwmgr)
+{
+       struct amdgpu_device *adev = (struct amdgpu_device *)(hwmgr->adev);
+       uint32_t pcie_speed = 0, pcie_width = 0, pcie_arg;
+       int ret;
+
+       if (adev->pm.pcie_gen_mask & CAIL_PCIE_LINK_SPEED_SUPPORT_GEN4)
+               pcie_speed = 16;
+       else if (adev->pm.pcie_gen_mask & CAIL_PCIE_LINK_SPEED_SUPPORT_GEN3)
+               pcie_speed = 8;
+       else if (adev->pm.pcie_gen_mask & CAIL_PCIE_LINK_SPEED_SUPPORT_GEN2)
+               pcie_speed = 5;
+       else if (adev->pm.pcie_gen_mask & CAIL_PCIE_LINK_SPEED_SUPPORT_GEN1)
+               pcie_speed = 2;
+
+       if (adev->pm.pcie_mlw_mask & CAIL_PCIE_LINK_WIDTH_SUPPORT_X32)
+               pcie_width = 32;
+       else if (adev->pm.pcie_mlw_mask & CAIL_PCIE_LINK_WIDTH_SUPPORT_X16)
+               pcie_width = 16;
+       else if (adev->pm.pcie_mlw_mask & CAIL_PCIE_LINK_WIDTH_SUPPORT_X12)
+               pcie_width = 12;
+       else if (adev->pm.pcie_mlw_mask & CAIL_PCIE_LINK_WIDTH_SUPPORT_X8)
+               pcie_width = 8;
+       else if (adev->pm.pcie_mlw_mask & CAIL_PCIE_LINK_WIDTH_SUPPORT_X4)
+               pcie_width = 4;
+       else if (adev->pm.pcie_mlw_mask & CAIL_PCIE_LINK_WIDTH_SUPPORT_X2)
+               pcie_width = 2;
+       else if (adev->pm.pcie_mlw_mask & CAIL_PCIE_LINK_WIDTH_SUPPORT_X1)
+               pcie_width = 1;
+
+       pcie_arg = pcie_width | (pcie_speed << 8);
+
+       ret = smum_send_msg_to_smc_with_parameter(hwmgr,
+                       PPSMC_MSG_OverridePcieParameters, pcie_arg);
+       PP_ASSERT_WITH_CODE(!ret,
+               "[OverridePcieParameters] Attempt to override pcie params failed!",
+               return ret);
+
+       return 0;
+}
+
 static int vega20_set_allowed_featuresmask(struct pp_hwmgr *hwmgr)
 {
        struct vega20_hwmgr *data =
@@ -1570,6 +1611,11 @@ static int vega20_enable_dpm_tasks(struct pp_hwmgr *hwmgr)
                        "[EnableDPMTasks] Failed to initialize SMC table!",
                        return result);
 
+       result = vega20_override_pcie_parameters(hwmgr);
+       PP_ASSERT_WITH_CODE(!result,
+                       "[EnableDPMTasks] Failed to override pcie parameters!",
+                       return result);
+
        result = vega20_run_btc(hwmgr);
        PP_ASSERT_WITH_CODE(!result,
                        "[EnableDPMTasks] Failed to run btc!",