netdev - Re: [PATCH v3 net 1/3] net: mediatek: sgmii: ensure the SGMII PHY is powered down on configuration

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Date:   Mon, 23 Jan 2023 11:24:58 +0100
From:   Simon Horman <simon.horman@...igine.com>
To:     Bjørn Mork <bjorn@...k.no>
Cc:     netdev@...r.kernel.org, Felix Fietkau <nbd@....name>,
        John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Daniel Golle <daniel@...rotopia.org>,
        Alexander Couzens <lynxis@...0.eu>,
        Russell King <rmk+kernel@...linux.org.uk>
Subject: Re: [PATCH v3 net 1/3] net: mediatek: sgmii: ensure the SGMII PHY is
 powered down on configuration

On Sun, Jan 22, 2023 at 10:21:51PM +0100, Bjørn Mork wrote:
> From: Alexander Couzens <lynxis@...0.eu>
> 
> The code expect the PHY to be in power down which is only true after reset.
> Allow changes of the SGMII parameters more than once.
> 
> Only power down when reconfiguring to avoid bouncing the link when there's
> no reason to - based on code from Russell King.
> 
> There are cases when the SGMII_PHYA_PWD register contains 0x9 which
> prevents SGMII from working. The SGMII still shows link but no traffic
> can flow. Writing 0x0 to the PHYA_PWD register fix the issue. 0x0 was
> taken from a good working state of the SGMII interface.
> 
> Suggested-by: Russell King (Oracle) <linux@...linux.org.uk>
> Signed-off-by: Alexander Couzens <lynxis@...0.eu>
> [ bmork: rebased and squashed into one patch ]
> Reviewed-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
> Signed-off-by: Bjørn Mork <bjorn@...k.no>
> ---
>  drivers/net/ethernet/mediatek/mtk_eth_soc.h |  2 ++
>  drivers/net/ethernet/mediatek/mtk_sgmii.c   | 39 +++++++++++++++------
>  2 files changed, 30 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
> index dff0e3ad2de6..70e729468a95 100644
> --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
> +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
> @@ -1067,11 +1067,13 @@ struct mtk_soc_data {
>   *                     SGMII modes
>   * @ana_rgc3:          The offset refers to register ANA_RGC3 related to regmap
>   * @pcs:               Phylink PCS structure
> + * @interface:         Currently configured interface mode
>   */
>  struct mtk_pcs {
>  	struct regmap	*regmap;
>  	u32             ana_rgc3;

nit: on x86_64 (at least) there is a 4 byte hole here.
It could be filled by the interface field.

>  	struct phylink_pcs pcs;
> +	phy_interface_t	interface;
>  };

...