net: dsa: microchip: fix initial port flush problem

The very first flush in any port will flush all learned addresses in all
ports.  This can be observed by unplugging the cable from one port while
additional ports are connected and dumping the fdb entries.

This problem is caused by the initially wrong value programmed to the
REG_SW_LUE_CTRL_1 register.  Setting SW_FLUSH_STP_TABLE and
SW_FLUSH_MSTP_TABLE bits does not have an immediate effect.  It is when
ksz9477_flush_dyn_mac_table() is called then the SW_FLUSH_STP_TABLE bit
takes effect and flushes all learned entries.  After that call both bits
are reset and so the next port flush will not cause such problem again.

Fixes: b987e98 ("dsa: add DSA switch driver for Microchip KSZ9477")
Signed-off-by: Tristram Ha <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: triha2work

drivers/net/dsa/microchip/ksz9477.c

@@ -355,10 +355,8 @@ int ksz9477_reset_switch(struct ksz_device *dev)
 			   SPI_AUTO_EDGE_DETECTION, 0);
 
 	/* default configuration */
-	ksz_read8(dev, REG_SW_LUE_CTRL_1, &data8);
-	data8 = SW_AGING_ENABLE | SW_LINK_AUTO_AGING |
-	      SW_SRC_ADDR_FILTER | SW_FLUSH_STP_TABLE | SW_FLUSH_MSTP_TABLE;
-	ksz_write8(dev, REG_SW_LUE_CTRL_1, data8);
+	ksz_write8(dev, REG_SW_LUE_CTRL_1,
+		   SW_AGING_ENABLE | SW_LINK_AUTO_AGING | SW_SRC_ADDR_FILTER);
 
 	/* disable interrupts */
 	ksz_write32(dev, REG_SW_INT_MASK__4, SWITCH_INT_MASK);