drm/amd/display: Check clock table return

[ Upstream commit 4b4f21ff7f5d11bb77e169b306dcbc5b216f5db5 ]

During the load processes for Renoir, our display code needs to retrieve
the SMU clock and voltage table, however, this operation can fail which
means that we have to check this scenario. Currently, we are not
handling this case properly and as a result, we have seen the following
dmesg log during the boot:

RIP: 0010:rn_clk_mgr_construct+0x129/0x3d0 [amdgpu]
...
Call Trace:
 dc_clk_mgr_create+0x16a/0x1b0 [amdgpu]
 dc_create+0x231/0x760 [amdgpu]

This commit fixes this issue by checking the return status retrieved
from the clock table before try to populate any bandwidth.

Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c
index 21a3073c8929e5576eed2ce67d3cf9dabb1cf6d3..2f8fee05547ac56ed82bc0132bc55ac9db5a39eb 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c
+++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn21/rn_clk_mgr.c
@@ -761,6 +761,7 @@ void rn_clk_mgr_construct(
 {
        struct dc_debug_options *debug = &ctx->dc->debug;
        struct dpm_clocks clock_table = { 0 };
+       enum pp_smu_status status = 0;
 
        clk_mgr->base.ctx = ctx;
        clk_mgr->base.funcs = &dcn21_funcs;
@@ -817,8 +818,10 @@ void rn_clk_mgr_construct(
        clk_mgr->base.bw_params = &rn_bw_params;
 
        if (pp_smu && pp_smu->rn_funcs.get_dpm_clock_table) {
-               pp_smu->rn_funcs.get_dpm_clock_table(&pp_smu->rn_funcs.pp_smu, &clock_table);
-               if (ctx->dc_bios && ctx->dc_bios->integrated_info) {
+               status = pp_smu->rn_funcs.get_dpm_clock_table(&pp_smu->rn_funcs.pp_smu, &clock_table);
+
+               if (status == PP_SMU_RESULT_OK &&
+                   ctx->dc_bios && ctx->dc_bios->integrated_info) {
                        rn_clk_mgr_helper_populate_bw_params (clk_mgr->base.bw_params, &clock_table, ctx->dc_bios->integrated_info);
                }
        }