drm/amdgpu: check return for setting engine dram timings

This resolves the unchecded return value warning reported by Coverity.

Signed-off-by: Tim Huang <[e-mail]>
Reviewed-by: Jesse Zhang <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c

···
 	return 0;
 }
 
-void amdgpu_atombios_set_engine_dram_timings(struct amdgpu_device *adev,
-					     u32 eng_clock, u32 mem_clock)
+int amdgpu_atombios_set_engine_dram_timings(struct amdgpu_device *adev,
+					    u32 eng_clock, u32 mem_clock)
 {
 	SET_ENGINE_CLOCK_PS_ALLOCATION args;
 	int index = GetIndexIntoMasterTable(COMMAND, DynamicMemorySettings);
···
 	if (mem_clock)
 		args.sReserved.ulClock = cpu_to_le32(mem_clock & SET_CLOCK_FREQ_MASK);
 
-	amdgpu_atom_execute_table(adev->mode_info.atom_context, index, (uint32_t *)&args,
-		sizeof(args));
+	return amdgpu_atom_execute_table(adev->mode_info.atom_context, index,
+					 (uint32_t *)&args, sizeof(args));
 }
 
 void amdgpu_atombios_get_default_voltages(struct amdgpu_device *adev,

drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.h

···
 					    bool strobe_mode,
 					    struct atom_mpll_param *mpll_param);
 
-void amdgpu_atombios_set_engine_dram_timings(struct amdgpu_device *adev,
-					     u32 eng_clock, u32 mem_clock);
+int amdgpu_atombios_set_engine_dram_timings(struct amdgpu_device *adev,
+					    u32 eng_clock, u32 mem_clock);
 
 bool
 amdgpu_atombios_is_voltage_gpio(struct amdgpu_device *adev,

drivers/gpu/drm/amd/pm/legacy-dpm/si_dpm.c

···
 	u32 dram_timing;
 	u32 dram_timing2;
 	u32 burst_time;
+	int ret;
 
 	arb_regs->mc_arb_rfsh_rate =
 		(u8)si_calculate_memory_refresh_rate(adev, pl->sclk);
 
-	amdgpu_atombios_set_engine_dram_timings(adev,
-					    pl->sclk,
-		                            pl->mclk);
+	ret = amdgpu_atombios_set_engine_dram_timings(adev, pl->sclk,
+						      pl->mclk);
+	if (ret)
+		return ret;
 
 	dram_timing  = RREG32(MC_ARB_DRAM_TIMING);
 	dram_timing2 = RREG32(MC_ARB_DRAM_TIMING2);