From patchwork Sun Dec 4 04:50:34 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Torokhov X-Patchwork-Id: 13063730 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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.lore.kernel.org (Postfix) with ESMTPS id 96A62C4321E for ; Sun, 4 Dec 2022 04:50:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) id 33CA0C433C1; Sun, 4 Dec 2022 04:50:40 +0000 (UTC) Received: from mail-pl1-f178.google.com (mail-pl1-f178.google.com [209.85.214.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.kernel.org (Postfix) with ESMTPS id CB050C433D6 for ; Sun, 4 Dec 2022 04:50:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 smtp.kernel.org CB050C433D6 Authentication-Results: smtp.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.kernel.org; spf=pass smtp.mailfrom=gmail.com Received: by mail-pl1-f178.google.com with SMTP id k7so8060896pll.6 for ; Sat, 03 Dec 2022 20:50:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-disposition:mime-version:message-id:subject:cc:to:from:date :from:to:cc:subject:date:message-id:reply-to; bh=G5RXZPYNU+MGBPjRAeU3aYtU4jqo7I+GsemvhOJe/IQ=; b=HZ3Jzy08bo6BR6ef6vSMmFg8qNnkSsmht0/NEpeDT2monTU4soJcvmDXBT/2uL+Ms6 pMDOvTtn8Cy+vUunaoSxxsr6Q6CQWtskPwC0EN/1D30EgSz0Xr2y02Yze/9W0QZs4KR2 1Qz2XJqQs7+fQ21Q3litDCICMKO6HF+Hs919/l9J/KIvhhP4QmFhiJvk8VbXGUZuf2BB jBs91beu7NBUSDIzfOiO31Gwh5vkQxU04Mt5ch0qx1YnXU5yymfiJ769rsvFEJg77qqp XtzpgW4vWao/iYKQp+aLUF3kjvQq5OPg6G3cUGHsDxwWTtePDXCmJaWY9tBCPH4f/mAo Nsbw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-disposition:mime-version:message-id:subject:cc:to:from:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=G5RXZPYNU+MGBPjRAeU3aYtU4jqo7I+GsemvhOJe/IQ=; b=qgVyyyjELVxBvc/ILUWbGD1wxTxJYBJE9Npme/g7HPobKDQaQ8tgNvcCAIKlSOygPH zyRj/BoOsG+IsQ4YIx2XyEKYiomLsKXK/1wmnZzeSk+OaH6m04/Fql/KVlc98b//Xj/l kBOktkk/ivL+ksSQ8Bi+4f4MKGFFAluLVxbT1VmwW60bOn4o2pJaN7Vq8Xs7GFt58E0B HyR/MTnHej7DnCsfrS5RvwOtgI4cxT6yosF7zx3snp28SXFLr45Aluj21LJTklgMAyNL xRuvjqLyHY0qLExf0ioaGzHRiB/MPVn5IGo9Eed3gX0p3TnY8h2rA6DfNp8RULpNtHb2 FeNg== X-Gm-Message-State: ANoB5pnFiS9RwJJLq/0jyjnKedZ1DgaL/SIlgkOF7PV5zU0s4UmP9604 s9nusH0psl6FpFD8CoJO7As= X-Google-Smtp-Source: AA0mqf7wyNuhKRXDWggFHjgJr0OniHRf0fRJqFY/fRXX3I4DTnRHj/XYZ0YfuFTr9qK8qWVZ1wXsfw== X-Received: by 2002:a17:90a:9c5:b0:219:89c3:23a9 with SMTP id 63-20020a17090a09c500b0021989c323a9mr11145029pjo.212.1670129438001; Sat, 03 Dec 2022 20:50:38 -0800 (PST) Received: from google.com ([2620:15c:9d:2:50bf:ab09:e932:bfd2]) by smtp.gmail.com with ESMTPSA id i10-20020a170902e48a00b00189bf5dc96dsm3575476ple.230.2022.12.03.20.50.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 03 Dec 2022 20:50:37 -0800 (PST) Date: Sat, 3 Dec 2022 20:50:34 -0800 From: Dmitry Torokhov List-Id: To: Arnd Bergmann , soc@kernel.org Cc: Li Yang , Qiang Zhao , Greg Kroah-Hartman , Linus Walleij , Andy Shevchenko , linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org Subject: [RESEND PATCH] soc: fsl: qe: request pins non-exclusively Message-ID: MIME-Version: 1.0 Content-Disposition: inline Commit 84582f9ed090 ("soc: fsl: qe: Avoid using gpio_to_desc()") changed qe_pin_request() to request and hold GPIO corresponding to a given pin. Unfortunately this does not work, as fhci-hcd requests these GPIOs first, before calling qe_pin_request() (see drivers/usb/host/fhci-hcd.c::of_fhci_probe()). To fix it change qe_pin_request() to request GPIOs non-exclusively, and free them once the code determines GPIO controller and offset for each GPIO/pin. Also reaching deep into gpiolib implementation is not the best idea. We should either export gpio_chip_hwgpio() or keep converting to the global gpio numbers space until we fix the driver to implement proper pin control. Fixes: 84582f9ed090 ("soc: fsl: qe: Avoid using gpio_to_desc()") Reviewed-by: Linus Walleij Signed-off-by: Dmitry Torokhov --- SoC team, the problematic patch has been in next for a while and it would be great to get the fix in to make sure the driver is not broken in 6.2. Thanks! drivers/soc/fsl/qe/gpio.c | 71 ++++++++++++++++++------------------- drivers/usb/host/fhci-hcd.c | 2 +- include/soc/fsl/qe/qe.h | 5 +-- 3 files changed, 38 insertions(+), 40 deletions(-) diff --git a/drivers/soc/fsl/qe/gpio.c b/drivers/soc/fsl/qe/gpio.c index 0ee887f89deb..5bb71a2b5b7a 100644 --- a/drivers/soc/fsl/qe/gpio.c +++ b/drivers/soc/fsl/qe/gpio.c @@ -13,7 +13,7 @@ #include #include #include -#include +#include /* for of_mm_gpio_chip */ #include #include #include @@ -21,13 +21,6 @@ #include #include -/* - * FIXME: this is legacy code that is accessing gpiolib internals in order - * to implement a custom pin controller. The proper solution is to create - * a real combined pin control and GPIO driver in drivers/pinctrl. However - * this hack is here for legacy code reasons. - */ -#include "../../../gpio/gpiolib.h" struct qe_gpio_chip { struct of_mm_gpio_chip mm_gc; @@ -149,20 +142,19 @@ struct qe_pin { * something like qe_pio_controller. Someday. */ struct qe_gpio_chip *controller; - struct gpio_desc *gpiod; int num; }; /** * qe_pin_request - Request a QE pin - * @np: device node to get a pin from - * @index: index of a pin in the device tree + * @dev: device to get the pin from + * @index: index of the pin in the device tree * Context: non-atomic * * This function return qe_pin so that you could use it with the rest of * the QE Pin Multiplexing API. */ -struct qe_pin *qe_pin_request(struct device_node *np, int index) +struct qe_pin *qe_pin_request(struct device *dev, int index) { struct qe_pin *qe_pin; struct gpio_chip *gc; @@ -171,40 +163,46 @@ struct qe_pin *qe_pin_request(struct device_node *np, int index) qe_pin = kzalloc(sizeof(*qe_pin), GFP_KERNEL); if (!qe_pin) { - pr_debug("%s: can't allocate memory\n", __func__); + dev_dbg(dev, "%s: can't allocate memory\n", __func__); return ERR_PTR(-ENOMEM); } - gpiod = fwnode_gpiod_get_index(of_fwnode_handle(np), NULL, index, GPIOD_ASIS, "qe"); - if (IS_ERR(gpiod)) { - err = PTR_ERR(gpiod); - goto err0; - } - if (!gpiod) { - err = -EINVAL; + /* + * Request gpio as nonexclusive as it was likely was reserved by + * the caller, and we are not planning on controlling it, we only + * need the descriptor to the to the gpio chip structure. + */ + gpiod = gpiod_get_index(dev, NULL, index, + GPIOD_ASIS | GPIOD_FLAGS_BIT_NONEXCLUSIVE); + err = PTR_ERR_OR_ZERO(gpiod); + if (err) goto err0; - } + gc = gpiod_to_chip(gpiod); if (WARN_ON(!gc)) { err = -ENODEV; goto err0; - } - qe_pin->gpiod = gpiod; - qe_pin->controller = gpiochip_get_data(gc); - /* - * FIXME: this gets the local offset on the gpio_chip so that the driver - * can manipulate pin control settings through its custom API. The real - * solution is to create a real pin control driver for this. - */ - qe_pin->num = gpio_chip_hwgpio(gpiod); - - if (!fwnode_device_is_compatible(gc->fwnode, "fsl,mpc8323-qe-pario-bank")) { - pr_debug("%s: tried to get a non-qe pin\n", __func__); - gpiod_put(gpiod); + } else if (!fwnode_device_is_compatible(gc->fwnode, + "fsl,mpc8323-qe-pario-bank")) { + dev_dbg(dev, "%s: tried to get a non-qe pin\n", __func__); err = -EINVAL; - goto err0; + } else { + qe_pin->controller = gpiochip_get_data(gc); + /* + * FIXME: this gets the local offset on the gpio_chip so that + * the driver can manipulate pin control settings through its + * custom API. The real solution is to create a real pin control + * driver for this. + */ + qe_pin->num = desc_to_gpio(gpiod) - gc->base; } - return qe_pin; + + /* We no longer need this descriptor */ + gpiod_put(gpiod); + + if (!err) + return qe_pin; + err0: kfree(qe_pin); pr_debug("%s failed with status %d\n", __func__, err); @@ -222,7 +220,6 @@ EXPORT_SYMBOL(qe_pin_request); */ void qe_pin_free(struct qe_pin *qe_pin) { - gpiod_put(qe_pin->gpiod); kfree(qe_pin); } EXPORT_SYMBOL(qe_pin_free); diff --git a/drivers/usb/host/fhci-hcd.c b/drivers/usb/host/fhci-hcd.c index 64a64140c2fd..92794ffc25c8 100644 --- a/drivers/usb/host/fhci-hcd.c +++ b/drivers/usb/host/fhci-hcd.c @@ -651,7 +651,7 @@ static int of_fhci_probe(struct platform_device *ofdev) } for (j = 0; j < NUM_PINS; j++) { - fhci->pins[j] = qe_pin_request(node, j); + fhci->pins[j] = qe_pin_request(dev, j); if (IS_ERR(fhci->pins[j])) { ret = PTR_ERR(fhci->pins[j]); dev_err(dev, "can't get pin %d: %d\n", j, ret); diff --git a/include/soc/fsl/qe/qe.h b/include/soc/fsl/qe/qe.h index b02e9fe69146..eb5079904cc8 100644 --- a/include/soc/fsl/qe/qe.h +++ b/include/soc/fsl/qe/qe.h @@ -172,14 +172,15 @@ static inline int par_io_data_set(u8 port, u8 pin, u8 val) { return -ENOSYS; } /* * Pin multiplexing functions. */ +struct device; struct qe_pin; #ifdef CONFIG_QE_GPIO -extern struct qe_pin *qe_pin_request(struct device_node *np, int index); +extern struct qe_pin *qe_pin_request(struct device *dev, int index); extern void qe_pin_free(struct qe_pin *qe_pin); extern void qe_pin_set_gpio(struct qe_pin *qe_pin); extern void qe_pin_set_dedicated(struct qe_pin *pin); #else -static inline struct qe_pin *qe_pin_request(struct device_node *np, int index) +static inline struct qe_pin *qe_pin_request(struct device *dev, int index) { return ERR_PTR(-ENOSYS); }