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[79.136.29.16]) by smtp.gmail.com with ESMTPSA id r2-v6sm5270270lja.78.2019.02.20.04.20.17 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 20 Feb 2019 04:20:17 -0800 (PST) From: Jonas Bonn To: linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org Cc: Jonas Bonn , Cristian Birsan , Felipe Balbi , Greg Kroah-Hartman , Nicolas Ferre , Alexandre Belloni , Ludovic Desroches , linux-arm-kernel@lists.infradead.org Subject: [PATCH 3/3] usb: gadget: atmel: tie wake lock to running clock Date: Wed, 20 Feb 2019 13:20:01 +0100 Message-Id: <20190220122001.5713-4-jonas@norrbonn.se> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190220122001.5713-1-jonas@norrbonn.se> References: <20190220122001.5713-1-jonas@norrbonn.se> 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 If the USB device is connected to a host, the CPU cannot be suspended or else the USB device appears to be disconnected from the host's point of view. Only after a "USB suspend" state has been entered (as set by the host) or the host is disconnected can the system safely be suspended: in both these states, the clock is stopped. As such, this patch associates a "wake lock" with the running clock of the UDC to keep the system awake as long as the host maintains the USB connection active. Signed-off-by: Jonas Bonn CC: Cristian Birsan CC: Felipe Balbi CC: Greg Kroah-Hartman CC: Nicolas Ferre CC: Alexandre Belloni CC: Ludovic Desroches CC: linux-arm-kernel@lists.infradead.org CC: linux-usb@vger.kernel.org --- drivers/usb/gadget/udc/atmel_usba_udc.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/usb/gadget/udc/atmel_usba_udc.c b/drivers/usb/gadget/udc/atmel_usba_udc.c index 740cb9308a86..864d03c3c9db 100644 --- a/drivers/usb/gadget/udc/atmel_usba_udc.c +++ b/drivers/usb/gadget/udc/atmel_usba_udc.c @@ -1859,6 +1859,8 @@ static int start_clock(struct usba_udc *udc) if (udc->clocked) return 0; + pm_stay_awake(&udc->pdev->dev); + ret = clk_prepare_enable(udc->pclk); if (ret) return ret; @@ -1881,6 +1883,8 @@ static void stop_clock(struct usba_udc *udc) clk_disable_unprepare(udc->pclk); udc->clocked = false; + + pm_relax(&udc->pdev->dev); } static int usba_start(struct usba_udc *udc) -- 2.19.1