[PATCH 18/38] MIPS: SGI-IP27: xbow_probe(): recognize KLTYPE_PBRICK_XBOW

[Imre Kaloz <kaloz@kernel.org>]

An IP35-family chassis records its crossbar board as KLTYPE_PBRICK_XBOW
rather than the KLTYPE_MIDPLANE8 an Origin 200/2000 midplane carries, so
xbow_probe() found no board record and never set up the crossbar. Fall
back to the brick type when the midplane lookup misses, and warn when
neither matches.

Signed-off-by: Imre Kaloz <kaloz@kernel.org>
---
 arch/mips/sgi-ip27/ip27-xtalk.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/arch/mips/sgi-ip27/ip27-xtalk.c b/arch/mips/sgi-ip27/ip27-xtalk.c
index 10834880c261..baa937b474a8 100644
--- a/arch/mips/sgi-ip27/ip27-xtalk.c
+++ b/arch/mips/sgi-ip27/ip27-xtalk.c
@@ -159,8 +159,19 @@ static int xbow_probe(nasid_t nasid)
 	 * need to probe xbow
 	 */
 	brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_MIDPLANE8);
-	if (!brd)
-		return -ENODEV;
+	if (!brd) {
+		/*
+		 * An IP35-family chassis records its crossbar as
+		 * KLTYPE_PBRICK_XBOW instead.
+		 */
+		brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid),
+				  KLTYPE_PBRICK_XBOW);
+		if (!brd) {
+			pr_warn("xtalk:n%d no midplane/xbow board found\n",
+				nasid);
+			return -ENODEV;
+		}
+	}
 
 	xbow_p = (klxbow_t *)find_component(brd, NULL, KLSTRUCT_XBOW);
 	if (!xbow_p)
-- 
2.47.3