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[90.86.254.77]) by smtp.gmail.com with ESMTPSA id s12sm1957125wmj.42.2019.03.29.02.33.44 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 29 Mar 2019 02:33:44 -0700 (PDT) From: Bartosz Golaszewski To: Sekhar Nori , Kevin Hilman , Alan Stern , Greg Kroah-Hartman Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH v2 3/6] usb: ohci-da8xx: disable the regulator if the overcurrent irq fired Date: Fri, 29 Mar 2019 10:33:31 +0100 Message-Id: <20190329093334.3885-4-brgl@bgdev.pl> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190329093334.3885-1-brgl@bgdev.pl> References: <20190329093334.3885-1-brgl@bgdev.pl> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Bartosz Golaszewski Historically the power supply management in this driver has been handled in two separate places in parallel. Device-tree users simply defined an appropriate regulator, while two boards with no DT support (da830-evm and omapl138-hawk) passed functions defined in their respective board files over platform data. These functions simply used legacy GPIO calls to watch the oc GPIO for interrupts and disable the vbus GPIO when the irq fires. Commit d193abf1c913 ("usb: ohci-da8xx: add vbus and overcurrent gpios") updated these GPIO calls to the modern API and moved them inside the driver. This however is not the optimal solution for the vbus GPIO which should be modeled as a fixed regulator that can be controlled with a GPIO. In order to keep the overcurrent protection available once we move the board files to using fixed regulators we need to disable the enable_reg regulator when the overcurrent indicator interrupt fires. Since we cannot call regulator_disable() from interrupt context, we need to switch to using a oneshot threaded interrupt. Signed-off-by: Bartosz Golaszewski --- drivers/usb/host/ohci-da8xx.c | 29 ++++++++++++++++++++++++----- 1 file changed, 24 insertions(+), 5 deletions(-) diff --git a/drivers/usb/host/ohci-da8xx.c b/drivers/usb/host/ohci-da8xx.c index 9c6d1f03b871..35eb2cb96a8f 100644 --- a/drivers/usb/host/ohci-da8xx.c +++ b/drivers/usb/host/ohci-da8xx.c @@ -206,8 +206,25 @@ static irqreturn_t ohci_da8xx_oc_handler(int irq, void *data) { struct da8xx_ohci_hcd *da8xx_ohci = data; - if (gpiod_get_value(da8xx_ohci->oc_gpio)) - gpiod_set_value(da8xx_ohci->vbus_gpio, 0); + if (gpiod_get_value(da8xx_ohci->oc_gpio)) { + if (da8xx_ohci->vbus_gpio) + gpiod_set_value(da8xx_ohci->vbus_gpio, 0); + else if (da8xx_ohci->vbus_reg) + return IRQ_WAKE_THREAD; + } + + return IRQ_HANDLED; +} + +static irqreturn_t ohci_da8xx_oc_thread(int irq, void *data) +{ + struct da8xx_ohci_hcd *da8xx_ohci = data; + struct device *dev = da8xx_ohci->hcd->self.controller; + int ret; + + ret = regulator_disable(da8xx_ohci->vbus_reg); + if (ret) + dev_err(dev, "Failed to disable regulator: %d\n", ret); return IRQ_HANDLED; } @@ -434,9 +451,11 @@ static int ohci_da8xx_probe(struct platform_device *pdev) if (oc_irq < 0) goto err; - error = devm_request_irq(dev, oc_irq, ohci_da8xx_oc_handler, - IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, - "OHCI over-current indicator", da8xx_ohci); + error = devm_request_threaded_irq(dev, oc_irq, + ohci_da8xx_oc_handler, ohci_da8xx_oc_thread, + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | + IRQF_ONESHOT, "OHCI over-current indicator", + da8xx_ohci); if (error) goto err; } -- 2.21.0