net: dsa: microchip: correct KSZ8795 static MAC table access

The KSZ8795 driver code was modified to use on KSZ8863/73, which has
different register definitions.  Some of the new KSZ8795 register
information are wrong compared to previous code.

KSZ8795 also behaves differently in that the STATIC_MAC_TABLE_USE_FID
and STATIC_MAC_TABLE_FID bits are off by 1 when doing MAC table reading
than writing.  To compensate that a special code was added to shift the
register value by 1 before applying those bits.  This is wrong when the
code is running on KSZ8863, so this special code is only executed when
KSZ8795 is detected.

Fixes: 4b20a07e103f ("net: dsa: microchip: ksz8795: add support for ksz88xx chips")
Signed-off-by: Tristram Ha <Tristram.Ha@microchip.com>
Reviewed-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h
index 28444e5924f9..a4de58847dea 100644
--- a/drivers/net/dsa/microchip/ksz_common.h
+++ b/drivers/net/dsa/microchip/ksz_common.h
@@ -601,6 +601,13 @@ static inline void ksz_regmap_unlock(void *__mtx)
 	mutex_unlock(mtx);
 }
 
+static inline bool ksz_is_ksz87xx(struct ksz_device *dev)
+{
+	return dev->chip_id == KSZ8795_CHIP_ID ||
+	       dev->chip_id == KSZ8794_CHIP_ID ||
+	       dev->chip_id == KSZ8765_CHIP_ID;
+}
+
 static inline bool ksz_is_ksz88x3(struct ksz_device *dev)
 {
 	return dev->chip_id == KSZ8830_CHIP_ID;