platform/x86: amd-pmc: Output error codes in messages

The return type for the s2idle callbacks is 'void', so any errors that
occur will no longer be displayed.

Output these error codes in the messages in case of any failures.
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20220317141445.6498-3-mario.limonciello@amd.comReviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/x86/amd-pmc.c

@@ -653,8 +653,10 @@ static void amd_pmc_s2idle_prepare(void)
 	/* Activate CZN specific RTC functionality */
 	if (pdev->cpu_id == AMD_CPU_ID_CZN) {
 		rc = amd_pmc_verify_czn_rtc(pdev, &arg);
-		if (rc)
+		if (rc) {
+			dev_err(pdev->dev, "failed to set RTC: %d\n", rc);
 			goto fail;
+		}
 	}
 
 	/* Dump the IdleMask before we send hint to SMU */
@@ -662,14 +664,14 @@ static void amd_pmc_s2idle_prepare(void)
 	msg = amd_pmc_get_os_hint(pdev);
 	rc = amd_pmc_send_cmd(pdev, arg, NULL, msg, 0);
 	if (rc) {
-		dev_err(pdev->dev, "suspend failed\n");
+		dev_err(pdev->dev, "suspend failed: %d\n", rc);
 		goto fail;
 	}
 
 	if (enable_stb)
 		rc = amd_pmc_write_stb(pdev, AMD_PMC_STB_PREDEF);
 	if (rc) {
-		dev_err(pdev->dev, "error writing to STB\n");
+		dev_err(pdev->dev, "error writing to STB: %d\n", rc);
 		goto fail;
 	}
 	return;
@@ -688,7 +690,7 @@ static void amd_pmc_s2idle_restore(void)
 	msg = amd_pmc_get_os_hint(pdev);
 	rc = amd_pmc_send_cmd(pdev, 0, NULL, msg, 0);
 	if (rc)
-		dev_err(pdev->dev, "resume failed\n");
+		dev_err(pdev->dev, "resume failed: %d\n", rc);
 
 	/* Let SMU know that we are looking for stats */
 	amd_pmc_send_cmd(pdev, 0, NULL, SMU_MSG_LOG_DUMP_DATA, 0);
@@ -700,7 +702,7 @@ static void amd_pmc_s2idle_restore(void)
 	if (enable_stb)
 		rc = amd_pmc_write_stb(pdev, AMD_PMC_STB_PREDEF + 1);
 	if (rc)
-		dev_err(pdev->dev, "error writing to STB\n");
+		dev_err(pdev->dev, "error writing to STB: %d\n", rc);
 
 	/* Restore the QoS request back to defaults if it was set */
 	if (pdev->cpu_id == AMD_CPU_ID_CZN)