From: David Miller <davem@davemloft.net>
To: willy.liu@realtek.com
Cc: andrew@lunn.ch, hkallweit1@gmail.com, linux@armlinux.org.uk,
kuba@kernel.org, fancer.lancer@gmail.com, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, kevans@FreeBSD.org,
ryankao@realtek.com
Subject: Re: [PATCH net v4] net: phy: realtek: fix rtl8211e rx/tx delay config
Date: Tue, 29 Sep 2020 12:56:32 -0700 (PDT) [thread overview]
Message-ID: <20200929.125632.1592891495047804335.davem@davemloft.net> (raw)
In-Reply-To: <1601345449-14676-1-git-send-email-willy.liu@realtek.com>
From: Willy Liu <willy.liu@realtek.com>
Date: Tue, 29 Sep 2020 10:10:49 +0800
> There are two chip pins named TXDLY and RXDLY which actually adds the 2ns
> delays to TXC and RXC for TXD/RXD latching. These two pins can config via
> 4.7k-ohm resistor to 3.3V hw setting, but also config via software setting
> (extension page 0xa4 register 0x1c bit13 12 and 11).
>
> The configuration register definitions from table 13 official PHY datasheet:
> PHYAD[2:0] = PHY Address
> AN[1:0] = Auto-Negotiation
> Mode = Interface Mode Select
> RX Delay = RX Delay
> TX Delay = TX Delay
> SELRGV = RGMII/GMII Selection
>
> This table describes how to config these hw pins via external pull-high or pull-
> low resistor.
>
> It is a misunderstanding that mapping it as register bits below:
> 8:6 = PHY Address
> 5:4 = Auto-Negotiation
> 3 = Interface Mode Select
> 2 = RX Delay
> 1 = TX Delay
> 0 = SELRGV
> So I removed these descriptions above and add related settings as below:
> 14 = reserved
> 13 = force Tx RX Delay controlled by bit12 bit11
> 12 = Tx Delay
> 11 = Rx Delay
> 10:0 = Test && debug settings reserved by realtek
>
> Test && debug settings are not recommend to modify by default.
>
> Fixes: f81dadbcf7fd ("net: phy: realtek: Add rtl8211e rx/tx delays config")
> Signed-off-by: Willy Liu <willy.liu@realtek.com>
Applied and queued up for -stable, thank you.
prev parent reply other threads:[~2020-09-29 19:56 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-29 2:10 [PATCH net v4] net: phy: realtek: fix rtl8211e rx/tx delay config Willy Liu
2020-09-29 19:56 ` David Miller [this message]
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