From patchwork Thu Jan 17 11:05:09 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yoshihiro Shimoda X-Patchwork-Id: 1026533 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=renesas.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 43gLsR5MZXz9sCX for ; Thu, 17 Jan 2019 22:08:11 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728982AbfAQLIK (ORCPT ); Thu, 17 Jan 2019 06:08:10 -0500 Received: from relmlor2.renesas.com ([210.160.252.172]:15966 "EHLO relmlie6.idc.renesas.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728485AbfAQLIH (ORCPT ); Thu, 17 Jan 2019 06:08:07 -0500 X-IronPort-AV: E=Sophos;i="5.56,488,1539615600"; d="scan'208";a="5246348" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie6.idc.renesas.com with ESMTP; 17 Jan 2019 20:08:03 +0900 Received: from localhost.localdomain (unknown [10.166.17.210]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id DC1B544A15FB; Thu, 17 Jan 2019 20:08:03 +0900 (JST) From: Yoshihiro Shimoda To: andrew@lunn.ch, f.fainelli@gmail.com, davem@davemloft.net Cc: netdev@vger.kernel.org, linux-renesas-soc@vger.kernel.org, devicetree@vger.kernel.org, Yoshihiro Shimoda Subject: [PATCH v3/RFT 2/2] net: phy: assert the phy reset during suspended if phy is not attached Date: Thu, 17 Jan 2019 20:05:09 +0900 Message-Id: <1547723109-28792-3-git-send-email-yoshihiro.shimoda.uh@renesas.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1547723109-28792-1-git-send-email-yoshihiro.shimoda.uh@renesas.com> References: <1547723109-28792-1-git-send-email-yoshihiro.shimoda.uh@renesas.com> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This phy_device driver deasserts the reset signal in the following functions (expect error path): - phy_device_register() - phy_probe() - phy_init_hw() that is called by phy_attach_direct() And, the phy_device asserts the reset signal in the following functions (expect error path): - phy_device_remove() - phy_remove() - phy_detach() So, if the following conditions happen, the reset signal keeps to be deasserted during suspended: - The phy driver is probed - But a net device doesn't open - And then the system enters suspend So, this patch adds to assert the reset signal in phy_suspend() if a phy is not attached. Otherwise, R-Car Gen3 Salvator-XS board could not link up correctly if we do the following method: 1) Kernel boots by using initramfs. 2) Kernel enters the suspend. 3) Kernel returns from suspend. 4) ifconfig eth0 up --> Then, since edge signal of the reset doesn't happen, it cannot link up. Signed-off-by: Yoshihiro Shimoda --- drivers/net/phy/phy_device.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c index d86356f..09ab62a 100644 --- a/drivers/net/phy/phy_device.c +++ b/drivers/net/phy/phy_device.c @@ -1346,6 +1346,10 @@ int phy_suspend(struct phy_device *phydev) if (ret) return ret; + /* Assert the reset signal if the phydev is not attached */ + if (!phydev->attached_dev) + phy_device_reset(phydev, 1); + phydev->suspended = true; return ret; @@ -1359,6 +1363,10 @@ int __phy_resume(struct phy_device *phydev) WARN_ON(!mutex_is_locked(&phydev->lock)); + /* Deassert the reset signal if the phydev is not attached */ + if (!phydev->attached_dev) + phy_device_reset(phydev, 0); + if (phydev->drv && phydrv->resume) ret = phydrv->resume(phydev);