From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andreas Schwab Subject: Re: macb: probe of 10090000.ethernet failed with error -110 Date: Thu, 29 Nov 2018 12:55:42 +0100 Message-ID: References: <2e17bba6-d932-37b2-5dca-0963fc50f5e6@gmail.com> <20181129055510.GB17675@lunn.ch> Mime-Version: 1.0 Content-Type: text/plain Cc: Palmer Dabbelt , f.fainelli@gmail.com, sergei.shtylyov@cogentembedded.com, atish.patra@wdc.com, nicolas.ferre@microchip.com, netdev@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, hkallweit1@gmail.com To: Andrew Lunn Return-path: In-Reply-To: <20181129055510.GB17675@lunn.ch> (Andrew Lunn's message of "Thu, 29 Nov 2018 06:55:10 +0100") Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On Nov 29 2018, Andrew Lunn wrote: > So if we assume you can identify the PHY using its ID registers, you > can put this reset code into the soft_reset call. That gets called > first before anything else. There is no need to add a new function to > phy_driver. I've tried the following, but it made things only worse, with the probing not working at all. Andreas. diff --git a/drivers/net/phy/mscc.c b/drivers/net/phy/mscc.c index 7cae175177..65baf31331 100644 --- a/drivers/net/phy/mscc.c +++ b/drivers/net/phy/mscc.c @@ -1822,6 +1822,23 @@ static int vsc85xx_probe(struct phy_device *phydev) return vsc85xx_dt_led_modes_get(phydev, default_mode); } +static int vsc8541_soft_reset(struct phy_device *phydev) +{ + /* The VSC8541 has an unexpected feature where a single reset + * rising edge can only be used to enter managed mode. For + * unmanaged mode a pair of reset rising edges is necessary. + */ + mdio_device_reset(&phydev->mdio, 0); + mdio_device_reset(&phydev->mdio, 1); + + /* After this pair of reset rising edges we must wait at least + * 15ms before writing any phy registers. + */ + msleep(15); + + return genphy_soft_reset(phydev); +} + /* Microsemi VSC85xx PHYs */ static struct phy_driver vsc85xx_driver[] = { { @@ -1908,7 +1925,7 @@ static struct phy_driver vsc85xx_driver[] = { .phy_id_mask = 0xfffffff0, .features = PHY_GBIT_FEATURES, .flags = PHY_HAS_INTERRUPT, - .soft_reset = &genphy_soft_reset, + .soft_reset = &vsc8541_soft_reset, .config_init = &vsc85xx_config_init, .config_aneg = &vsc85xx_config_aneg, .aneg_done = &genphy_aneg_done, -- 2.19.2 -- Andreas Schwab, SUSE Labs, schwab@suse.de GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7 "And now for something completely different."