[Skiboot] [RFC 07/12] npu2-opencapi: Detect PHY reset errors

[Frederic Barrat]

PHY reset can fail! Though past problems are now fixed, let's handle
any future failure.

Signed-off-by: Frederic Barrat <fbarrat at linux.ibm.com>
---
 hw/npu2-hw-procedures.c | 13 ++++++++++---
 hw/npu2-opencapi.c      |  5 ++++-
 include/npu2.h          |  2 +-
 3 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/hw/npu2-hw-procedures.c b/hw/npu2-hw-procedures.c
index 98e93191..e9501f12 100644
--- a/hw/npu2-hw-procedures.c
+++ b/hw/npu2-hw-procedures.c
@@ -1049,10 +1049,17 @@ void npu2_opencapi_phy_init(struct npu2_dev *dev)
 	}
 }
 
-void npu2_opencapi_phy_reset(struct npu2_dev *dev)
+int npu2_opencapi_phy_reset(struct npu2_dev *dev)
 {
-	run_procedure(dev, 4); /* procedure_phy_reset */
-	run_procedure(dev, 6); /* procedure_phy_rx_dccal */
+	int rc;
+
+	rc = run_procedure(dev, 4); /* procedure_phy_reset */
+	if (rc != PROCEDURE_COMPLETE)
+		return -1;
+	rc = run_procedure(dev, 6); /* procedure_phy_rx_dccal */
+	if (rc != PROCEDURE_COMPLETE)
+		return -1;
+	return 0;
 }
 
 void npu2_opencapi_phy_prbs31(struct npu2_dev *dev)
diff --git a/hw/npu2-opencapi.c b/hw/npu2-opencapi.c
index 1328ee93..153f2c6f 100644
--- a/hw/npu2-opencapi.c
+++ b/hw/npu2-opencapi.c
@@ -1200,6 +1200,7 @@ static int64_t npu2_opencapi_freset(struct pci_slot *slot)
 	struct npu2_dev *dev = phb_to_npu2_dev_ocapi(slot->phb);
 	uint32_t chip_id = dev->npu->chip_id;
 	uint8_t presence = 1;
+	int rc;
 
 	switch (slot->state) {
 	case OCAPI_SLOT_NORMAL:
@@ -1229,7 +1230,9 @@ static int64_t npu2_opencapi_freset(struct pci_slot *slot)
 		return pci_slot_set_sm_timeout(slot, msecs_to_tb(5));
 
 	case OCAPI_SLOT_FRESET_ASSERT_DELAY:
-		npu2_opencapi_phy_reset(dev);
+		rc = npu2_opencapi_phy_reset(dev);
+		if (rc)
+			return OPAL_HARDWARE;
 		deassert_odl_reset(chip_id, dev->brick_index);
 		deassert_adapter_reset(dev);
 		pci_slot_set_state(slot,
diff --git a/include/npu2.h b/include/npu2.h
index 6aead6cb..4648464b 100644
--- a/include/npu2.h
+++ b/include/npu2.h
@@ -247,7 +247,7 @@ void npu2_clear_link_flag(struct npu2_dev *ndev, uint8_t flag);
 uint32_t reset_ntl(struct npu2_dev *ndev);
 extern int nv_zcal_nominal;
 void npu2_opencapi_phy_init(struct npu2_dev *dev);
-void npu2_opencapi_phy_reset(struct npu2_dev *dev);
+int npu2_opencapi_phy_reset(struct npu2_dev *dev);
 void npu2_opencapi_phy_prbs31(struct npu2_dev *dev);
 void npu2_opencapi_bump_ui_lane(struct npu2_dev *dev);
 int64_t npu2_freeze_status(struct phb *phb __unused,
-- 
2.21.0