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Message-ID: <aI5gDWqMBBtESscm@pengutronix.de>
Date: Sat, 2 Aug 2025 20:59:25 +0200
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Tristram.Ha@...rochip.com
Cc: Oleksij Rempel <linux@...pel-privat.de>,
Woojung Huh <woojung.huh@...rochip.com>,
Andrew Lunn <andrew@...n.ch>, Vladimir Oltean <olteanv@...il.com>,
Maxime Chevallier <maxime.chevallier@...tlin.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
UNGLinuxDriver@...rochip.com, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: dsa: microchip: Fix KSZ8863 reset problem
Hi,
On Fri, Aug 01, 2025 at 05:22:53PM -0700, Tristram.Ha@...rochip.com wrote:
> From: Tristram Ha <tristram.ha@...rochip.com>
>
> ksz8873_valid_regs[] was added for register access for KSZ8863/KSZ8873
> switches, but the reset register is not in the list so
> ksz8_reset_switch() does not take any effect.
>
> ksz_cfg() is updated to display an error so that there will be a future
> check for adding new register access code.
>
> A side effect of not resetting the switch is the static MAC table is not
> cleared. Further additions to the table will show write error as there
> are only 8 entries in the table.
Thank you for fixing it!
> Fixes: d0dec3333040 ("net: dsa: microchip: Add register access control for KSZ8873 chip")
> Signed-off-by: Tristram Ha <tristram.ha@...rochip.com>
> ---
> drivers/net/dsa/microchip/ksz8.c | 7 ++++++-
> drivers/net/dsa/microchip/ksz_common.c | 1 +
> 2 files changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/dsa/microchip/ksz8.c b/drivers/net/dsa/microchip/ksz8.c
> index 76e490070e9c..6d282a8e3684 100644
> --- a/drivers/net/dsa/microchip/ksz8.c
> +++ b/drivers/net/dsa/microchip/ksz8.c
> @@ -36,7 +36,12 @@
>
> static void ksz_cfg(struct ksz_device *dev, u32 addr, u8 bits, bool set)
> {
> - regmap_update_bits(ksz_regmap_8(dev), addr, bits, set ? bits : 0);
> + int ret;
> +
> + ret = regmap_update_bits(ksz_regmap_8(dev), addr, bits, set ? bits : 0);
> + if (ret)
> + dev_err(dev->dev, "can't update reg 0x%x: %pe\n", addr,
> + ERR_PTR(ret));
Better using ksz_rmw8() instead. It is already providing error message.
In this file there is 4 direct accesses to regmap_update_bits() without
error handling. It would be great if you have chance to replace it with
ksz_rmw8() too.
> }
>
> static void ksz_port_cfg(struct ksz_device *dev, int port, int offset, u8 bits,
> diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
> index 7292bfe2f7ca..4cb14288ff0f 100644
> --- a/drivers/net/dsa/microchip/ksz_common.c
> +++ b/drivers/net/dsa/microchip/ksz_common.c
> @@ -1447,6 +1447,7 @@ static const struct regmap_range ksz8873_valid_regs[] = {
> regmap_reg_range(0x3f, 0x3f),
>
> /* advanced control registers */
> + regmap_reg_range(0x43, 0x43),
This register is no documented in the public documentation. Out of
curiosity, are there some where more information about this two
"reserved" register ranges: 0x3A-0x3E and 0x40-0x5F?
Best regards,
Oleksij
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