From patchwork Fri Nov 3 16:43:23 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 741218 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 D4ECF1C2BC for ; Fri, 3 Nov 2023 16:43:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="m3wVna0k" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 45509C433C8; Fri, 3 Nov 2023 16:43:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699029814; bh=AKJI6ud2/gqzwSf2vyoKUTsXLPjddX84FQGpHNeQVNE=; h=From:To:Cc:Subject:Date:From; b=m3wVna0kVxQ6v441O/jKbp5N8irWGgjATWudGzxUK9bGqx/kDunXmxDDUwWpf5w/m EkolboyL9WxzhbBo63r5HnTRMYoFGP7tcSO2kRxj4WD7N/tkmA1DgM6V/VU5mxVvOk RS2OAqremX9mWjsQrThv4EBpVQGsdN+wAgXcuNPapmOFNzFs4aeelXlGU9aGxAqgpC 1rEZkl3Fen+LUVE9PtED1vw78RQldn0eHx68lL44l98PetaUubtEqQ+0CF1MUGguae 4Ncu9HFwshrKHf9CJwxZy2b47KCIjC2o/OT0f47rUyZkVkfnH4nS7r7FuxdITIOWC+ ZxjpcmDGUJluA== Received: from johan by xi.lan with local (Exim 4.96) (envelope-from ) id 1qyxHH-0003j7-05; Fri, 03 Nov 2023 17:44:11 +0100 From: Johan Hovold To: Mathias Nyman Cc: Greg Kroah-Hartman , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Johan Hovold , stable@vger.kernel.org, Maxime Ripard , Stanley Chang Subject: [PATCH] USB: xhci-plat: fix legacy PHY double init Date: Fri, 3 Nov 2023 17:43:23 +0100 Message-ID: <20231103164323.14294-1-johan+linaro@kernel.org> X-Mailer: git-send-email 2.41.0 Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Commits 7b8ef22ea547 ("usb: xhci: plat: Add USB phy support") and 9134c1fd0503 ("usb: xhci: plat: Add USB 3.0 phy support") added support for looking up legacy PHYs from the sysdev devicetree node and initialising them. This broke drivers such as dwc3 which manages PHYs themself as the PHYs would now be initialised twice, something which specifically can lead to resources being left enabled during suspend (e.g. with the usb_phy_generic PHY driver). As the dwc3 driver uses driver-name matching for the xhci platform device, fix this by only looking up and initialising PHYs for devices that have been matched using OF. Note that checking that the platform device has a devicetree node would currently be sufficient, but that could lead to subtle breakages in case anyone ever tries to reuse an ancestor's node. Fixes: 7b8ef22ea547 ("usb: xhci: plat: Add USB phy support") Fixes: 9134c1fd0503 ("usb: xhci: plat: Add USB 3.0 phy support") Cc: stable@vger.kernel.org # 4.1 Cc: Maxime Ripard Cc: Stanley Chang Signed-off-by: Johan Hovold Tested-by: Stanley Chang --- drivers/usb/host/xhci-plat.c | 50 +++++++++++++++++++++--------------- 1 file changed, 30 insertions(+), 20 deletions(-) diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c index 28218c8f1837..01d19d17153b 100644 --- a/drivers/usb/host/xhci-plat.c +++ b/drivers/usb/host/xhci-plat.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include #include @@ -148,7 +149,7 @@ int xhci_plat_probe(struct platform_device *pdev, struct device *sysdev, const s int ret; int irq; struct xhci_plat_priv *priv = NULL; - + bool of_match; if (usb_disabled()) return -ENODEV; @@ -253,16 +254,23 @@ int xhci_plat_probe(struct platform_device *pdev, struct device *sysdev, const s &xhci->imod_interval); } - hcd->usb_phy = devm_usb_get_phy_by_phandle(sysdev, "usb-phy", 0); - if (IS_ERR(hcd->usb_phy)) { - ret = PTR_ERR(hcd->usb_phy); - if (ret == -EPROBE_DEFER) - goto disable_clk; - hcd->usb_phy = NULL; - } else { - ret = usb_phy_init(hcd->usb_phy); - if (ret) - goto disable_clk; + /* + * Drivers such as dwc3 manages PHYs themself (and rely on driver name + * matching for the xhci platform device). + */ + of_match = of_match_device(pdev->dev.driver->of_match_table, &pdev->dev); + if (of_match) { + hcd->usb_phy = devm_usb_get_phy_by_phandle(sysdev, "usb-phy", 0); + if (IS_ERR(hcd->usb_phy)) { + ret = PTR_ERR(hcd->usb_phy); + if (ret == -EPROBE_DEFER) + goto disable_clk; + hcd->usb_phy = NULL; + } else { + ret = usb_phy_init(hcd->usb_phy); + if (ret) + goto disable_clk; + } } hcd->tpl_support = of_usb_host_tpl_support(sysdev->of_node); @@ -285,15 +293,17 @@ int xhci_plat_probe(struct platform_device *pdev, struct device *sysdev, const s goto dealloc_usb2_hcd; } - xhci->shared_hcd->usb_phy = devm_usb_get_phy_by_phandle(sysdev, - "usb-phy", 1); - if (IS_ERR(xhci->shared_hcd->usb_phy)) { - xhci->shared_hcd->usb_phy = NULL; - } else { - ret = usb_phy_init(xhci->shared_hcd->usb_phy); - if (ret) - dev_err(sysdev, "%s init usb3phy fail (ret=%d)\n", - __func__, ret); + if (of_match) { + xhci->shared_hcd->usb_phy = devm_usb_get_phy_by_phandle(sysdev, + "usb-phy", 1); + if (IS_ERR(xhci->shared_hcd->usb_phy)) { + xhci->shared_hcd->usb_phy = NULL; + } else { + ret = usb_phy_init(xhci->shared_hcd->usb_phy); + if (ret) + dev_err(sysdev, "%s init usb3phy fail (ret=%d)\n", + __func__, ret); + } } xhci->shared_hcd->tpl_support = hcd->tpl_support;