[PATCH] cxl: Rework error message for incompatible slots

[Frederic Barrat]

Improve the error message shown if a capi adapter is plugged on a
capi-incompatible slot directly under the PHB (no intermediate switch).

Fixes: 5632874311db ("cxl: Add support for POWER9 DD2")
Cc: stable at vger.kernel.org # 4.14+
Signed-off-by: Frederic Barrat <fbarrat at linux.ibm.com>
---
 drivers/misc/cxl/pci.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c
index 25a9dd9c0c1b..2ba899f5659f 100644
--- a/drivers/misc/cxl/pci.c
+++ b/drivers/misc/cxl/pci.c
@@ -393,8 +393,8 @@ int cxl_calc_capp_routing(struct pci_dev *dev, u64 *chipid,
 	*capp_unit_id = get_capp_unit_id(np, *phb_index);
 	of_node_put(np);
 	if (!*capp_unit_id) {
-		pr_err("cxl: invalid capp unit id (phb_index: %d)\n",
-		       *phb_index);
+		pr_err("cxl: No capp unit found for PHB[%lld,%d]. Make sure the adapter is on a capi-compatible slot\n",
+		       *chipid, *phb_index);
 		return -ENODEV;
 	}
 
-- 
2.25.1