[PATCH v2] drm/amd/pm/powerplay/smumgr/fiji_smumgr: Add error check in fiji_populate_smc_boot_level()

[Wentao Liang]

The return value of fiji_populate_smc_boot_level() is needs to be checked.
An error handling is also needed to phm_find_boot_level() to reset the
boot level when the function fails. A proper implementation can be found
in tonga_populate_smc_boot_level().

Fixes: dcaf3483ae46 ("drm/amd/pm/powerplay/smumgr/fiji_smumgr: Remove unused variable 'result'")
Cc: stable at vger.kernel.org # v5.11+
Signed-off-by: Wentao Liang <vulab at iscas.ac.cn>
---
v2: Fix error code.

 .../drm/amd/pm/powerplay/smumgr/fiji_smumgr.c | 23 ++++++++++++++-----
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/pm/powerplay/smumgr/fiji_smumgr.c b/drivers/gpu/drm/amd/pm/powerplay/smumgr/fiji_smumgr.c
index 5e43ad2b2956..78ba22f249b2 100644
--- a/drivers/gpu/drm/amd/pm/powerplay/smumgr/fiji_smumgr.c
+++ b/drivers/gpu/drm/amd/pm/powerplay/smumgr/fiji_smumgr.c
@@ -1600,19 +1600,30 @@ static int fiji_populate_smc_uvd_level(struct pp_hwmgr *hwmgr,
 static int fiji_populate_smc_boot_level(struct pp_hwmgr *hwmgr,
 		struct SMU73_Discrete_DpmTable *table)
 {
+	int result = 0;
 	struct smu7_hwmgr *data = (struct smu7_hwmgr *)(hwmgr->backend);
 
 	table->GraphicsBootLevel = 0;
 	table->MemoryBootLevel = 0;
 
 	/* find boot level from dpm table */
-	phm_find_boot_level(&(data->dpm_table.sclk_table),
-			    data->vbios_boot_state.sclk_bootup_value,
-			    (uint32_t *)&(table->GraphicsBootLevel));
+	result = phm_find_boot_level(&(data->dpm_table.sclk_table),
+				     data->vbios_boot_state.sclk_bootup_value,
+				     (uint32_t *)&(table->GraphicsBootLevel));
+	if (result != 0) {
+		table->GraphicsBootLevel = 0;
+		pr_err("VBIOS did not find boot engine clock value in dependency table. Using Graphics DPM level 0!\n");
+		result = 0;
+	}
 
-	phm_find_boot_level(&(data->dpm_table.mclk_table),
-			    data->vbios_boot_state.mclk_bootup_value,
-			    (uint32_t *)&(table->MemoryBootLevel));
+	result = phm_find_boot_level(&(data->dpm_table.mclk_table),
+				     data->vbios_boot_state.mclk_bootup_value,
+				     (uint32_t *)&(table->MemoryBootLevel));
+	if (result != 0) {
+		table->MemoryBootLevel = 0;
+		pr_err("VBIOS did not find boot engine clock value in dependency table. Using Memory DPM level 0!\n");
+		result = 0;
+	}
 
 	table->BootVddc  = data->vbios_boot_state.vddc_bootup_value *
 			VOLTAGE_SCALE;
-- 
2.42.0.windows.2