Re: [PATCH] ARM: imx: stop adjusting ar8031 phy tx delay

From: Shawn Guo <shawnguo@kernel.org>
To: "André Draszik" <git@andred.net>
Cc: Kate Stewart <kstewart@linuxfoundation.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	linux-kernel@vger.kernel.org,
	Russell King <linux@armlinux.org.uk>,
	NXP Linux Team <linux-imx@nxp.com>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Thomas Gleixner <tglx@linutronix.de>,
	Leonard Crestez <leonard.crestez@nxp.com>,
	Fabio Estevam <festevam@gmail.com>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] ARM: imx: stop adjusting ar8031 phy tx delay
Date: Mon, 19 Aug 2019 09:51:40 +0200	[thread overview]
Message-ID: <20190819075139.GF5999@X250> (raw)
In-Reply-To: <20190809031256.3594-1-git@andred.net>

On Fri, Aug 09, 2019 at 04:12:56AM +0100, André Draszik wrote:
> Recent changes to the Atheros at803x driver cause
> the approach taken here to stop working because
> commit 6d4cd041f0af
> ("net: phy: at803x: disable delay only for RGMII mode")
> and commit cd28d1d6e52e
> ("net: phy: at803x: Disable phy delay for RGMII mode")
> fix the AR8031 driver to configure the phy's (RX/TX)
> delays as per the 'phy-mode' in the device tree.
> 
> In particular, the phy tx (and rx) delays are updated
> again as per the 'phy-mode' *after* the code in here
> runs.
> 
> Things worked before above commits, because the AR8031
> comes out of reset with RX delay enabled, and the
> at803x driver didn't touch the delay configuration at
> all when "rgmii" mode was selected.
> 
> It appears the code in here tries to make device
> trees work that incorrectly specify "rgmii", but
> that can't work any more and it is imperative since
> above commits to have the phy-mode configured
> correctly in the device tree.
> 
> I suspect there are a few imx7d based boards using
> the ar8031 phy and phy-mode = "rgmii", but given I
> don't know which ones exactly, I am not in a
> position to update the respective device trees.
> 
> Hence this patch is simply removing the superfluous
> code from the imx7d initialisation. An alternative
> could be to add a warning instead, but that would
> penalize all boards that have been updated already.
> 
> Signed-off-by: André Draszik <git@andred.net>
> CC: Russell King <linux@armlinux.org.uk>
> CC: Shawn Guo <shawnguo@kernel.org>
> CC: Sascha Hauer <s.hauer@pengutronix.de>
> CC: Pengutronix Kernel Team <kernel@pengutronix.de>
> CC: Fabio Estevam <festevam@gmail.com>
> CC: NXP Linux Team <linux-imx@nxp.com>
> CC: Kate Stewart <kstewart@linuxfoundation.org>
> CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> CC: Thomas Gleixner <tglx@linutronix.de>
> CC: Leonard Crestez <leonard.crestez@nxp.com>
> CC: linux-arm-kernel@lists.infradead.org

Applied, thanks.

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