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authorAlexander Couzens2022-09-17 02:07:34 +0200
committerJakub Kicinski2022-09-23 06:58:49 -0700
commit728c2af6ad8c809f66639b70e4fd8c67c57c66e7 (patch)
treea74996d7f4b648cd75d0691c33db2b1d6812c61b /drivers/net/dsa
parent42bc4fafe359ed6b73602b7a2dba0dd99588f8ce (diff)
net: mt7531: ensure all MACs are powered down before reset
The datasheet [1] explicit describes it as requirement for a reset. [1] MT7531 Reference Manual for Development Board rev 1.0, page 735 Signed-off-by: Alexander Couzens <lynxis@fe80.eu> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net/dsa')
-rw-r--r--drivers/net/dsa/mt7530.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 95a57aeb466e..409d5c3d76ea 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c
@@ -2329,6 +2329,10 @@ mt7531_setup(struct dsa_switch *ds)
return -ENODEV;
}
+ /* all MACs must be forced link-down before sw reset */
+ for (i = 0; i < MT7530_NUM_PORTS; i++)
+ mt7530_write(priv, MT7530_PMCR_P(i), MT7531_FORCE_LNK);
+
/* Reset the switch through internal reset */
mt7530_write(priv, MT7530_SYS_CTRL,
SYS_CTRL_PHY_RST | SYS_CTRL_SW_RST |