From patchwork Thu Jan 18 10:43:41 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andre Werner X-Patchwork-Id: 13522692 X-Patchwork-Delegate: kuba@kernel.org Received: from mail.systec-electronic.com (mail.systec-electronic.com [77.220.239.22]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6218022F06; Thu, 18 Jan 2024 10:50:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=77.220.239.22 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705575022; cv=none; b=uePK3Mg5xV6eRNlUYBMi1bqFR9C5VFBC6pLfmBDqHu+9rB+UudS+cwEQMx45l+YSeNI255IKJtlydtymN4hJOk4p9j0G9l1K3uDmY17KPloki20Ri5wQZ7J9NcvpvGwJ4/bWhai8Q0tUUWLqPVgTzQUdtGWEr5cLlSqo5fACyqU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705575022; c=relaxed/simple; bh=hDDXvdoNu8vOBXyjictCiicouiBYP0yBck+Nijapc7A=; h=Received:Received:Received:DKIM-Filter:DKIM-Signature: X-Virus-Scanned:Received:Received:From:To:Cc:Subject:Date: Message-ID:X-Mailer:MIME-Version:Content-Transfer-Encoding; b=kTc/bUcpr5BBREXWoSNSZkHkIt6CwWiEMhA88OmVuBYdNIyWm0Av6aVMHsEtUHDrhLX/Sv0tDV6iQca/oC5OY+eDniuIQ+LzWrxZUTEv7H0vo5r3z+aN+igEnG0XOentxXCDG38id6EDkEMEaJpIEgePR7TRXQCtnW8eOSUqEKk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=systec-electronic.com; spf=pass smtp.mailfrom=systec-electronic.com; dkim=pass (2048-bit key) header.d=systec-electronic.com header.i=@systec-electronic.com header.b=jweTdpNd; arc=none smtp.client-ip=77.220.239.22 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=systec-electronic.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=systec-electronic.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=systec-electronic.com header.i=@systec-electronic.com header.b="jweTdpNd" Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.systec-electronic.com (Postfix) with ESMTP id 0935B9400107; Thu, 18 Jan 2024 11:43:46 +0100 (CET) Received: from mail.systec-electronic.com ([127.0.0.1]) by localhost (mail.systec-electronic.com [127.0.0.1]) (amavis, port 10032) with ESMTP id kmPasBcjk7Jn; Thu, 18 Jan 2024 11:43:45 +0100 (CET) Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.systec-electronic.com (Postfix) with ESMTP id D50E0941A5CF; Thu, 18 Jan 2024 11:43:45 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.10.3 mail.systec-electronic.com D50E0941A5CF DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=systec-electronic.com; s=B34D3B04-5DC7-11EE-83E3-4D8CAB78E8CD; t=1705574625; bh=WxeGf6vaj1r+8COYX0/cdjukb0tx7B8JYxC+WAtqHa0=; h=From:To:Date:Message-ID:MIME-Version; b=jweTdpNdDn+ajwP/fyZNxaw16T2I+A0f+HsXVCiLa0RmlDN5BV7ZKJJEojjIdF2i/ 3h9eSv7UAOOQmPSeCmz37EClt4Urbt8H/JKY8cLjL6+yxMuzBZ1aVXG+ZZ0cdgC7X+ HvX0n+m0UtTlSq17Jb3IpZUUDWGFv+TnVmXdZRf+b7XCXvkN9EoYRRfsACnVJoIaUV +nblJVNJQ6QxuQ1GR0yt4WV0E4fjY8b279Gpfe1CYOSX4yUV0AuZ7pMpycUFf3adN0 t5xsOZ8fzm/GJIPl8CB56tTlmm39Q8QzY+93gLz99AT68jFU6J+mVbB6JyObmCqyw0 kgSv2fffF1GYQ== X-Virus-Scanned: amavis at systec-electronic.com Received: from mail.systec-electronic.com ([127.0.0.1]) by localhost (mail.systec-electronic.com [127.0.0.1]) (amavis, port 10026) with ESMTP id km2frKiTSdy9; Thu, 18 Jan 2024 11:43:45 +0100 (CET) Received: from ws-565760.systec.local (unknown [212.185.67.148]) by mail.systec-electronic.com (Postfix) with ESMTPSA id 822909400107; Thu, 18 Jan 2024 11:43:45 +0100 (CET) From: Andre Werner To: andrew@lunn.ch, hkallweit1@gmail.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com Cc: linux@armlinux.org.uk, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Andre Werner Subject: [PATCH] net: phy: adin1100: Fix nullptr exception for phy interrupts Date: Thu, 18 Jan 2024 11:43:41 +0100 Message-ID: <20240118104341.10832-1-andre.werner@systec-electronic.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org If using ADIN1100 as an external phy, e.g. in combination with "smsc95xx", we ran into nullptr exception by creating a link. In our case the "smsc95xx" does not check for an available interrupt handler on external phy driver to use poll instead of interrupts if no handler is available. So we decide to implement a small handler in the phy driver to support other MACs as well. I update the driver to add an interrupt handler because libphy does not check if their is a interrupt handler available either. There are several interrupts maskable at the phy, but only link change interrupts are handled by the driver yet. We tested the combination "smsc95xx" and "adin1100" with Linux Kernel 6.6.9 and Linux Kernel 6.1.0, respectively. Signed-off-by: Andre Werner --- drivers/net/phy/adin1100.c | 58 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) diff --git a/drivers/net/phy/adin1100.c b/drivers/net/phy/adin1100.c index 7619d6185801..ed8a7e6250cf 100644 --- a/drivers/net/phy/adin1100.c +++ b/drivers/net/phy/adin1100.c @@ -18,6 +18,12 @@ #define PHY_ID_ADIN1110 0x0283bc91 #define PHY_ID_ADIN2111 0x0283bca1 +#define ADIN_PHY_SUBSYS_IRQ_MASK 0x0021 +#define ADIN_LINK_STAT_CHNG_IRQ_EN BIT(1) + +#define ADIN_PHY_SUBSYS_IRQ_STATUS 0x0011 +#define ADIN_LINK_STAT_CHNG BIT(1) + #define ADIN_FORCED_MODE 0x8000 #define ADIN_FORCED_MODE_EN BIT(0) @@ -136,6 +142,56 @@ static int adin_config_aneg(struct phy_device *phydev) return genphy_c45_config_aneg(phydev); } +static int adin_phy_ack_intr(struct phy_device *phydev) +{ + /* Clear pending interrupts */ + int rc = phy_read_mmd(phydev, MDIO_MMD_VEND2, ADIN_PHY_SUBSYS_IRQ_STATUS); + + return rc < 0 ? rc : 0; +} + +static int adin_config_intr(struct phy_device *phydev) +{ + int ret, regval; + + ret = adin_phy_ack_intr(phydev); + + if (ret) + return ret; + + regval = phy_read_mmd(phydev, MDIO_MMD_VEND2, ADIN_PHY_SUBSYS_IRQ_MASK); + if (regval < 0) + return regval; + + if (phydev->interrupts == PHY_INTERRUPT_ENABLED) + regval |= ADIN_LINK_STAT_CHNG_IRQ_EN; + else + regval &= ~ADIN_LINK_STAT_CHNG_IRQ_EN; + + ret = phy_write_mmd(phydev, MDIO_MMD_VEND2, + ADIN_PHY_SUBSYS_IRQ_MASK, + regval); + return ret; +} + +static irqreturn_t adin_phy_handle_interrupt(struct phy_device *phydev) +{ + int irq_status; + + irq_status = phy_read_mmd(phydev, MDIO_MMD_VEND2, ADIN_PHY_SUBSYS_IRQ_STATUS); + if (irq_status < 0) { + phy_error(phydev); + return IRQ_NONE; + } + + if (!(irq_status & ADIN_LINK_STAT_CHNG)) + return IRQ_NONE; + + phy_trigger_machine(phydev); + + return IRQ_HANDLED; +} + static int adin_set_powerdown_mode(struct phy_device *phydev, bool en) { int ret; @@ -275,6 +331,8 @@ static struct phy_driver adin_driver[] = { .probe = adin_probe, .config_aneg = adin_config_aneg, .read_status = adin_read_status, + .config_intr = adin_config_intr, + .handle_interrupt = adin_phy_handle_interrupt, .set_loopback = adin_set_loopback, .suspend = adin_suspend, .resume = adin_resume,