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[35.222.220.147]) by smtp.gmail.com with UTF8SMTPSA id u14-20020a02b1ce000000b0047464deaba5sm1816183jah.114.2024.02.27.09.55.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 27 Feb 2024 09:55:08 -0800 (PST) Date: Tue, 27 Feb 2024 17:55:07 +0000 From: Matthias Kaehlcke To: Javier Carrasco Cc: Liam Girdwood , Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Greg Kroah-Hartman , Helen Koike , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , Catalin Marinas , Will Deacon , Russell King , linux-sound@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v4 2/8] usb: misc: onboard_dev: add support for non-hub devices Message-ID: References: <20240220-onboard_xvf3500-v4-0-dc1617cc5dd4@wolfvision.net> <20240220-onboard_xvf3500-v4-2-dc1617cc5dd4@wolfvision.net> <174ce57a-3197-4251-831f-205ec5cfeae9@wolfvision.net> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <174ce57a-3197-4251-831f-205ec5cfeae9@wolfvision.net> On Thu, Feb 22, 2024 at 03:42:26PM +0100, Javier Carrasco wrote: > On 21.02.24 20:24, Matthias Kaehlcke wrote: > > On Tue, Feb 20, 2024 at 03:05:46PM +0100, Javier Carrasco wrote: > >> Most of the functionality this driver provides can be used by non-hub > >> devices as well. > >> > >> To account for the hub-specific code, add a flag to the device data > >> structure and check its value for hub-specific code. > > > > Please mention that the driver doesn't power off non-hub devices > > during system suspend. > > > >> Signed-off-by: Javier Carrasco > >> --- > >> drivers/usb/misc/onboard_usb_dev.c | 3 ++- > >> drivers/usb/misc/onboard_usb_dev.h | 10 ++++++++++ > >> 2 files changed, 12 insertions(+), 1 deletion(-) > >> > >> diff --git a/drivers/usb/misc/onboard_usb_dev.c b/drivers/usb/misc/onboard_usb_dev.c > >> index 2103af2cb2a6..f43130a6786f 100644 > >> --- a/drivers/usb/misc/onboard_usb_dev.c > >> +++ b/drivers/usb/misc/onboard_usb_dev.c > >> @@ -129,7 +129,8 @@ static int __maybe_unused onboard_dev_suspend(struct device *dev) > >> if (!device_may_wakeup(node->udev->bus->controller)) > >> continue; > >> > >> - if (usb_wakeup_enabled_descendants(node->udev)) { > >> + if (usb_wakeup_enabled_descendants(node->udev) || > >> + !onboard_dev->pdata->is_hub) { > > > > > > This check isn't dependent on characteristics of the USB devices processed > > in this loop, therefore it can be performed at function entry. Please combine > > it with the check of 'always_powered_in_suspend'. It's also an option to > > omit the check completely, 'always_powered_in_suspend' will never be set for > > non-hub devices (assuming the sysfs attribute isn't added). > > > > The attribute will not be available for non-hub devices in v5. However, > if the check is completely removed, will power_off not stay true at the > end of the function, always leading to a device power off? As you said, > 'always_powered_in_suspend' will not be set for non-hub devices. Even without the sysfs attribute the field 'always_powered_in_suspend' could be set to true by probe() for non-hub devices.