hw/xscom: Reset XSCOM engine after querying sleeping core FIR

XSCOM engine blocks subsequently after querying FIR of any
sleeping core. This causes subsequent XSCOM opertions to hang
forever due to XSCOM engine being continuously busy. Reset XSCOM
engine after querying FIR of any sleeping core.

Signed-off-by: Vipin K Parashar <vipin@linux.vnet.ibm.com>
Signed-off-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/hw/xscom.c b/hw/xscom.c
index c6dc93b..b8402ab 100644
--- a/hw/xscom.c
+++ b/hw/xscom.c
@@ -166,8 +166,9 @@ static int64_t xscom_handle_error(uint64_t hmer, uint32_t gcid, uint32_t pcb_add
 				gcid, pcb_addr, stat);
 		return OPAL_BUSY;
 
-	/* CPU is asleep, don't retry */
+	/* CPU is asleep, reset XSCOM engine and return */
 	case 2:
+		xscom_reset(gcid);
 		return OPAL_WRONG_STATE;
 	}