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net: mt7531: ensure all MACs are powered down before reset

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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>
This commit is contained in:
Alexander Couzens 2022-09-17 02:07:34 +02:00 committed by Jakub Kicinski
parent 42bc4fafe3
commit 728c2af6ad
1 changed files with 4 additions and 0 deletions
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4
drivers/net/dsa/mt7530.c
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@ -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 |