From patchwork Fri Feb 16 18:42:35 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Florian Fainelli X-Patchwork-Id: 13560469 X-Patchwork-Delegate: kuba@kernel.org Received: from relay.smtp-ext.broadcom.com (unknown [192.19.166.228]) (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 74B5C1350FC; Fri, 16 Feb 2024 18:42:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.19.166.228 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708108972; cv=none; b=Smdb7zEZnScd3onrjqVaXwmjMxum3qRuk65cvOoYUIfwUpuqXTdIcehQgcqtsUqvrMeQuRKfntRz2gIfYDpDvlP16Kt+4n/BC5A/CcXHMbHewNdHXZuhaADVOrXgDNmt5VWmUbSvtqVxAMOeQKYzRGEC2ZcqwNSnUrjDa7+olG0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708108972; c=relaxed/simple; bh=atI59ZlQl2UfZ0o6mIsOBAuc8zQwlqIYK/Qn+yb3SGk=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Rt6OV6aFcmbxAfANa+e0cnZEfJlKy3+I+Mb/JXRJkqsXxmmJAfcoYUNZJFa5r3Kj6z7JeziZHBKuilgNVaOvXO7gI+WfxbctSojw2ZS57GBxSznfEaZfSdyTad74PtzTLr1kSOUpJjBCMpuY/PzjUi0q744Z4RbmQDU82kmXCW4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=broadcom.com; spf=fail smtp.mailfrom=broadcom.com; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b=IH/yY4oR; arc=none smtp.client-ip=192.19.166.228 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=broadcom.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=broadcom.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="IH/yY4oR" Received: from mail-lvn-it-01.lvn.broadcom.net (mail-lvn-it-01.lvn.broadcom.net [10.36.132.253]) by relay.smtp-ext.broadcom.com (Postfix) with ESMTP id 1A455C001CD0; Fri, 16 Feb 2024 10:42:44 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 relay.smtp-ext.broadcom.com 1A455C001CD0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=broadcom.com; s=dkimrelay; t=1708108964; bh=atI59ZlQl2UfZ0o6mIsOBAuc8zQwlqIYK/Qn+yb3SGk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IH/yY4oRCbR1PpdzdsKDbn7iEBADnVed9AQW/Ci5NmNGXoKqJxvmLJRD8Ay/jQYCo bbNlFG9raduRNTvoaH/Vf6iERQW+qQ4rDTnj+GjWaLtZcgypZgES6iBUrj5HF5NqpI 1k0R1cE3f6wiTdgEotxg7AbBUDFwKVFrVdn5gWXc= Received: from fainelli-desktop.igp.broadcom.net (fainelli-desktop.dhcp.broadcom.net [10.67.48.245]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail-lvn-it-01.lvn.broadcom.net (Postfix) with ESMTPSA id 8430718041CAC6; Fri, 16 Feb 2024 10:42:42 -0800 (PST) From: Florian Fainelli To: netdev@vger.kernel.org Cc: Florian Fainelli , Doug Berger , Broadcom internal kernel review list , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Andrew Lunn , Heiner Kallweit , Russell King , linux-kernel@vger.kernel.org (open list), Justin Chen Subject: [PATCH net-next 1/3] net: mdio: mdio-bcm-unimac: Manage clock around I/O accesses Date: Fri, 16 Feb 2024 10:42:35 -0800 Message-Id: <20240216184237.259954-2-florian.fainelli@broadcom.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240216184237.259954-1-florian.fainelli@broadcom.com> References: <20240216184237.259954-1-florian.fainelli@broadcom.com> 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 Up until now we have managed not to have the mdio-bcm-unimac manage its clock except during probe and suspend/resume. This works most of the time, except where it does not. With a fully modular build, we can get into a situation whereby the GENET driver is fully registered, and so is the mdio-bcm-unimac driver, however the Ethernet PHY driver is not yet, because it depends on a resource that is not yet available (e.g.: GPIO provider). In that state, the network device is not usable yet, and so to conserve power, the GENET driver will have turned off its "main" clock which feeds its MDIO controller. When the PHY driver finally probes however, we make an access to the PHY registers to e.g.: disable interrupts, and this causes a bus error within the MDIO controller space because the MDIO controller clock(s) are turned off. To remedy that, we manage the clock around all of the I/O accesses to the hardware which are done exclusively during read, write and clock divider configuration. This ensures that the register space is accessible, and this also ensures that there are not unnecessarily elevated reference counts keeping the clocks active when the network device is administratively turned off. It would be the case with the previous way of managing the clock. Signed-off-by: Florian Fainelli Reviewed-by: Jacob Keller --- drivers/net/mdio/mdio-bcm-unimac.c | 91 ++++++++++--------- include/linux/platform_data/mdio-bcm-unimac.h | 3 + 2 files changed, 51 insertions(+), 43 deletions(-) diff --git a/drivers/net/mdio/mdio-bcm-unimac.c b/drivers/net/mdio/mdio-bcm-unimac.c index 68f8ee0ec8ba..0619e5d596d1 100644 --- a/drivers/net/mdio/mdio-bcm-unimac.c +++ b/drivers/net/mdio/mdio-bcm-unimac.c @@ -94,6 +94,10 @@ static int unimac_mdio_read(struct mii_bus *bus, int phy_id, int reg) int ret; u32 cmd; + ret = clk_prepare_enable(priv->clk); + if (ret) + return ret; + /* Prepare the read operation */ cmd = MDIO_RD | (phy_id << MDIO_PMD_SHIFT) | (reg << MDIO_REG_SHIFT); unimac_mdio_writel(priv, cmd, MDIO_CMD); @@ -103,7 +107,7 @@ static int unimac_mdio_read(struct mii_bus *bus, int phy_id, int reg) ret = priv->wait_func(priv->wait_func_data); if (ret) - return ret; + goto out; cmd = unimac_mdio_readl(priv, MDIO_CMD); @@ -112,10 +116,15 @@ static int unimac_mdio_read(struct mii_bus *bus, int phy_id, int reg) * that condition here and ignore the MDIO controller read failure * indication. */ - if (!(bus->phy_ignore_ta_mask & 1 << phy_id) && (cmd & MDIO_READ_FAIL)) - return -EIO; + if (!(bus->phy_ignore_ta_mask & 1 << phy_id) && (cmd & MDIO_READ_FAIL)) { + ret = -EIO; + goto out; + } - return cmd & 0xffff; + ret = cmd & 0xffff; +out: + clk_disable_unprepare(priv->clk); + return ret; } static int unimac_mdio_write(struct mii_bus *bus, int phy_id, @@ -123,6 +132,11 @@ static int unimac_mdio_write(struct mii_bus *bus, int phy_id, { struct unimac_mdio_priv *priv = bus->priv; u32 cmd; + int ret; + + ret = clk_prepare_enable(priv->clk); + if (ret) + return ret; /* Prepare the write operation */ cmd = MDIO_WR | (phy_id << MDIO_PMD_SHIFT) | @@ -131,7 +145,10 @@ static int unimac_mdio_write(struct mii_bus *bus, int phy_id, unimac_mdio_start(priv); - return priv->wait_func(priv->wait_func_data); + ret = priv->wait_func(priv->wait_func_data); + clk_disable_unprepare(priv->clk); + + return ret; } /* Workaround for integrated BCM7xxx Gigabit PHYs which have a problem with @@ -178,14 +195,19 @@ static int unimac_mdio_reset(struct mii_bus *bus) return 0; } -static void unimac_mdio_clk_set(struct unimac_mdio_priv *priv) +static int unimac_mdio_clk_set(struct unimac_mdio_priv *priv) { unsigned long rate; u32 reg, div; + int ret; /* Keep the hardware default values */ if (!priv->clk_freq) - return; + return 0; + + ret = clk_prepare_enable(priv->clk); + if (ret) + return ret; if (!priv->clk) rate = 250000000; @@ -195,7 +217,8 @@ static void unimac_mdio_clk_set(struct unimac_mdio_priv *priv) div = (rate / (2 * priv->clk_freq)) - 1; if (div & ~MDIO_CLK_DIV_MASK) { pr_warn("Incorrect MDIO clock frequency, ignoring\n"); - return; + ret = 0; + goto out; } /* The MDIO clock is the reference clock (typically 250Mhz) divided by @@ -205,6 +228,9 @@ static void unimac_mdio_clk_set(struct unimac_mdio_priv *priv) reg &= ~(MDIO_CLK_DIV_MASK << MDIO_CLK_DIV_SHIFT); reg |= div << MDIO_CLK_DIV_SHIFT; unimac_mdio_writel(priv, reg, MDIO_CFG); +out: + clk_disable_unprepare(priv->clk); + return ret; } static int unimac_mdio_probe(struct platform_device *pdev) @@ -235,24 +261,12 @@ static int unimac_mdio_probe(struct platform_device *pdev) return -ENOMEM; } - priv->clk = devm_clk_get_optional(&pdev->dev, NULL); - if (IS_ERR(priv->clk)) - return PTR_ERR(priv->clk); - - ret = clk_prepare_enable(priv->clk); - if (ret) - return ret; - if (of_property_read_u32(np, "clock-frequency", &priv->clk_freq)) priv->clk_freq = 0; - unimac_mdio_clk_set(priv); - priv->mii_bus = mdiobus_alloc(); - if (!priv->mii_bus) { - ret = -ENOMEM; - goto out_clk_disable; - } + if (!priv->mii_bus) + return -ENOMEM; bus = priv->mii_bus; bus->priv = priv; @@ -261,17 +275,27 @@ static int unimac_mdio_probe(struct platform_device *pdev) priv->wait_func = pdata->wait_func; priv->wait_func_data = pdata->wait_func_data; bus->phy_mask = ~pdata->phy_mask; + priv->clk = pdata->clk; } else { bus->name = "unimac MII bus"; priv->wait_func_data = priv; priv->wait_func = unimac_mdio_poll; + priv->clk = devm_clk_get_optional(&pdev->dev, NULL); } + + if (IS_ERR(priv->clk)) + goto out_mdio_free; + bus->parent = &pdev->dev; bus->read = unimac_mdio_read; bus->write = unimac_mdio_write; bus->reset = unimac_mdio_reset; snprintf(bus->id, MII_BUS_ID_SIZE, "%s-%d", pdev->name, pdev->id); + ret = unimac_mdio_clk_set(priv); + if (ret) + goto out_mdio_free; + ret = of_mdiobus_register(bus, np); if (ret) { dev_err(&pdev->dev, "MDIO bus registration failed\n"); @@ -286,8 +310,6 @@ static int unimac_mdio_probe(struct platform_device *pdev) out_mdio_free: mdiobus_free(bus); -out_clk_disable: - clk_disable_unprepare(priv->clk); return ret; } @@ -297,34 +319,17 @@ static void unimac_mdio_remove(struct platform_device *pdev) mdiobus_unregister(priv->mii_bus); mdiobus_free(priv->mii_bus); - clk_disable_unprepare(priv->clk); -} - -static int __maybe_unused unimac_mdio_suspend(struct device *d) -{ - struct unimac_mdio_priv *priv = dev_get_drvdata(d); - - clk_disable_unprepare(priv->clk); - - return 0; } static int __maybe_unused unimac_mdio_resume(struct device *d) { struct unimac_mdio_priv *priv = dev_get_drvdata(d); - int ret; - ret = clk_prepare_enable(priv->clk); - if (ret) - return ret; - - unimac_mdio_clk_set(priv); - - return 0; + return unimac_mdio_clk_set(priv); } static SIMPLE_DEV_PM_OPS(unimac_mdio_pm_ops, - unimac_mdio_suspend, unimac_mdio_resume); + NULL, unimac_mdio_resume); static const struct of_device_id unimac_mdio_ids[] = { { .compatible = "brcm,asp-v2.1-mdio", }, diff --git a/include/linux/platform_data/mdio-bcm-unimac.h b/include/linux/platform_data/mdio-bcm-unimac.h index 8a5f9f0b2c52..724e1f57b81f 100644 --- a/include/linux/platform_data/mdio-bcm-unimac.h +++ b/include/linux/platform_data/mdio-bcm-unimac.h @@ -1,11 +1,14 @@ #ifndef __MDIO_BCM_UNIMAC_PDATA_H #define __MDIO_BCM_UNIMAC_PDATA_H +struct clk; + struct unimac_mdio_pdata { u32 phy_mask; int (*wait_func)(void *data); void *wait_func_data; const char *bus_name; + struct clk *clk; }; #define UNIMAC_MDIO_DRV_NAME "unimac-mdio" From patchwork Fri Feb 16 18:42:36 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Florian Fainelli X-Patchwork-Id: 13560468 X-Patchwork-Delegate: kuba@kernel.org Received: from relay.smtp-ext.broadcom.com (unknown [192.19.166.231]) (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 744C31350FB; 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Fri, 16 Feb 2024 10:42:42 -0800 (PST) From: Florian Fainelli To: netdev@vger.kernel.org Cc: Florian Fainelli , Doug Berger , Broadcom internal kernel review list , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Andrew Lunn , Heiner Kallweit , Russell King , linux-kernel@vger.kernel.org (open list), Justin Chen Subject: [PATCH net-next 2/3] net: bcmgenet: Pass "main" clock down to the MDIO driver Date: Fri, 16 Feb 2024 10:42:36 -0800 Message-Id: <20240216184237.259954-3-florian.fainelli@broadcom.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240216184237.259954-1-florian.fainelli@broadcom.com> References: <20240216184237.259954-1-florian.fainelli@broadcom.com> 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 GENET has historically had to create a MDIO platform device for its controller and pass some auxiliary data to it, like a MDIO completion callback. Now we also pass the "main" clock to allow for the MDIO bus controller to manage that clock adequately around I/O accesses. Signed-off-by: Florian Fainelli Reviewed-by: Jacob Keller --- drivers/net/ethernet/broadcom/genet/bcmmii.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c b/drivers/net/ethernet/broadcom/genet/bcmmii.c index cbbe004621bc..7a21950da77c 100644 --- a/drivers/net/ethernet/broadcom/genet/bcmmii.c +++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c @@ -476,6 +476,10 @@ static int bcmgenet_mii_register(struct bcmgenet_priv *priv) ppd.wait_func = bcmgenet_mii_wait; ppd.wait_func_data = priv; ppd.bus_name = "bcmgenet MII bus"; + /* Pass a reference to our "main" clock which is used for MDIO + * transfers + */ + ppd.clk = priv->clk; /* Unimac MDIO bus controller starts at UniMAC offset + MDIO_CMD * and is 2 * 32-bits word long, 8 bytes total. From patchwork Fri Feb 16 18:42:37 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Florian Fainelli X-Patchwork-Id: 13560471 X-Patchwork-Delegate: kuba@kernel.org Received: from relay.smtp-ext.broadcom.com (unknown [192.19.166.231]) (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 7448212BEA5; Fri, 16 Feb 2024 18:42:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.19.166.231 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708108973; cv=none; b=pyrV7aETUWV/Vh7Mx0zZGITxZEGqpGBJbmHiEnaKDp4exn/9cQi3/5YyKrN93CD2NdMVFActXz09HayTx7EFWUCeVz1M0CLb2I4z795mqhe1dH/qnmWJhUIIsfCWzZ0Jzpe/3+axfus+dkyK1x1g4K6FgTPjg0s4hIWyp4Swjhw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708108973; c=relaxed/simple; bh=aYVN0ClhfDjP4lyRugwKQwrba9nObMXNir2vK77i6h8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=IGtzpAADf8xzhyfgh/t/NgIIMe3EBAWueffYQyjB2NLPTcrLUYRevkb/GbMhXyKs7nAukcuBirbcaN8tjURRe9gBgZxtZwP823GzwD3Db+ISgiBBWNM1I4AT7wHsw7kCXC6DMjFuCs2gtIEH3Aa+atfZQBUG7NqdYvy70QwLDeE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=broadcom.com; spf=fail smtp.mailfrom=broadcom.com; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b=Kosdvd/0; arc=none smtp.client-ip=192.19.166.231 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=broadcom.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=broadcom.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="Kosdvd/0" Received: from mail-lvn-it-01.lvn.broadcom.net (mail-lvn-it-01.lvn.broadcom.net [10.36.132.253]) by relay.smtp-ext.broadcom.com (Postfix) with ESMTP id 5A595C001649; Fri, 16 Feb 2024 10:42:44 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 relay.smtp-ext.broadcom.com 5A595C001649 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=broadcom.com; s=dkimrelay; t=1708108964; bh=aYVN0ClhfDjP4lyRugwKQwrba9nObMXNir2vK77i6h8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Kosdvd/0aXFCgAb/wSbT4QkgQzw0O6+P4UZsh6g9NqKv1Z3YpNL4exLRaPQE3MhHI AJ0JF7oK6feH+Bu4GhKHVOZ8LprE/GpSoOXMo6LCv/KbjCFow+ss96vYdEu77rdeTQ z14x9A9PeTWqUgTG0+jmbk6rf8c12n1gWXecUhhM= Received: from fainelli-desktop.igp.broadcom.net (fainelli-desktop.dhcp.broadcom.net [10.67.48.245]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail-lvn-it-01.lvn.broadcom.net (Postfix) with ESMTPSA id D2D7518041CAC6; Fri, 16 Feb 2024 10:42:42 -0800 (PST) From: Florian Fainelli To: netdev@vger.kernel.org Cc: Florian Fainelli , Doug Berger , Broadcom internal kernel review list , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Andrew Lunn , Heiner Kallweit , Russell King , linux-kernel@vger.kernel.org (open list), Justin Chen Subject: [PATCH net-next 3/3] Revert "net: bcmgenet: Ensure MDIO unregistration has clocks enabled" Date: Fri, 16 Feb 2024 10:42:37 -0800 Message-Id: <20240216184237.259954-4-florian.fainelli@broadcom.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240216184237.259954-1-florian.fainelli@broadcom.com> References: <20240216184237.259954-1-florian.fainelli@broadcom.com> 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 This reverts commit eac0aac07f6af47b8ba57c8064bf04ed6df73d1d ("net: bcmgenet: Ensure MDIO unregistration has clocks enabled"). This is no longer necessary now that the MDIO bus controller has a clock that it can manage around the I/O accesses. Signed-off-by: Florian Fainelli Reviewed-by: Jacob Keller --- drivers/net/ethernet/broadcom/genet/bcmmii.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c b/drivers/net/ethernet/broadcom/genet/bcmmii.c index 7a21950da77c..9ada89355747 100644 --- a/drivers/net/ethernet/broadcom/genet/bcmmii.c +++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c @@ -678,7 +678,5 @@ void bcmgenet_mii_exit(struct net_device *dev) if (of_phy_is_fixed_link(dn)) of_phy_deregister_fixed_link(dn); of_node_put(priv->phy_dn); - clk_prepare_enable(priv->clk); platform_device_unregister(priv->mii_pdev); - clk_disable_unprepare(priv->clk); }