platform/x86/amd: pmc: Don't try to read SMU version on Picasso

Picasso doesn't support the command in the uPEP mailbox to try to
read the SMU version.

Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2449
Fixes: f6045de ("platform/x86: amd-pmc: Export Idlemask values based on the APU")
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20230409185348.556161-2-Shyam-sundar.S-k@amd.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/x86/amd/pmc.c

@@ -403,6 +403,9 @@ static int amd_pmc_get_smu_version(struct amd_pmc_dev *dev)
 	int rc;
 	u32 val;
 
+	if (dev->cpu_id == AMD_CPU_ID_PCO)
+		return -ENODEV;
+
 	rc = amd_pmc_send_cmd(dev, 0, &val, SMU_MSG_GETSMUVERSION, 1);
 	if (rc)
 		return rc;