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[217.229.29.98]) by smtp.gmail.com with ESMTPSA id u15sm30741852wrn.46.2020.04.17.10.05.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Apr 2020 10:05:46 -0700 (PDT) From: Thierry Reding To: Felipe Balbi , Greg Kroah-Hartman Cc: Jon Hunter , Nagarjuna Kristam , linux-usb@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] usb: gadget: tegra-xudc: Fix idle suspend/resume Date: Fri, 17 Apr 2020 19:05:37 +0200 Message-Id: <20200417170537.2540914-1-thierry.reding@gmail.com> X-Mailer: git-send-email 2.24.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org From: Thierry Reding When the XUDC device is idle (i.e. powergated), care must be taken not to access any registers because that would lead to a crash. Move the call to tegra_xudc_device_mode_off() into the same conditional as the tegra_xudc_powergate() call to make sure we only force device mode off if the XUDC is actually powered up. Fixes: 49db427232fe ("usb: gadget: Add UDC driver for tegra XUSB device mode controller") Signed-off-by: Thierry Reding --- drivers/usb/gadget/udc/tegra-xudc.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/usb/gadget/udc/tegra-xudc.c b/drivers/usb/gadget/udc/tegra-xudc.c index 52a6add961f4..dfabc54cdc27 100644 --- a/drivers/usb/gadget/udc/tegra-xudc.c +++ b/drivers/usb/gadget/udc/tegra-xudc.c @@ -3840,11 +3840,11 @@ static int __maybe_unused tegra_xudc_suspend(struct device *dev) flush_work(&xudc->usb_role_sw_work); - /* Forcibly disconnect before powergating. */ - tegra_xudc_device_mode_off(xudc); - - if (!pm_runtime_status_suspended(dev)) + if (!pm_runtime_status_suspended(dev)) { + /* Forcibly disconnect before powergating. */ + tegra_xudc_device_mode_off(xudc); tegra_xudc_powergate(xudc); + } pm_runtime_disable(dev); -- 2.24.1