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[35.222.57.144]) by smtp.gmail.com with UTF8SMTPSA id bp24-20020a056e02349800b00363da909ebcsm2915892ilb.56.2024.02.28.10.10.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 28 Feb 2024 10:10:46 -0800 (PST) Date: Wed, 28 Feb 2024 18:10:45 +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 v5 6/8] usb: misc: onboard_dev: add support for non-hub devices Message-ID: References: <20240228-onboard_xvf3500-v5-0-76b805fd3fe6@wolfvision.net> <20240228-onboard_xvf3500-v5-6-76b805fd3fe6@wolfvision.net> Precedence: bulk X-Mailing-List: devicetree@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: <20240228-onboard_xvf3500-v5-6-76b805fd3fe6@wolfvision.net> On Wed, Feb 28, 2024 at 02:51:33PM +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. > > The 'always_powered_in_supend' attribute is only available for hub > devices, keeping the driver's default behavior for non-hub devices (keep > on in suspend). > > Signed-off-by: Javier Carrasco > --- > drivers/usb/misc/onboard_usb_dev.c | 25 +++++++++++++++++++++++-- > drivers/usb/misc/onboard_usb_dev.h | 10 ++++++++++ > 2 files changed, 33 insertions(+), 2 deletions(-) > > diff --git a/drivers/usb/misc/onboard_usb_dev.c b/drivers/usb/misc/onboard_usb_dev.c > index e1779bd2d126..df0ed172c7ec 100644 > --- a/drivers/usb/misc/onboard_usb_dev.c > +++ b/drivers/usb/misc/onboard_usb_dev.c > @@ -132,7 +132,8 @@ static int __maybe_unused onboard_dev_suspend(struct device *dev) > struct usbdev_node *node; > bool power_off = true; > > - if (onboard_dev->always_powered_in_suspend) > + if (onboard_dev->always_powered_in_suspend && > + !onboard_dev->pdata->is_hub) > return 0; With this non-hub devices would always be powered down, since 'always_powerd_in_suspend' is not set for them. This should be: if (!onboard_dev->pdata->is_hub || onboard_dev->always_powered_in_suspend) Checking for the (non-)hub status first is clearer IMO, also it avoids an unneccessary check of 'always_powered' for non-hub devices. Without code context: for hubs there can be multiple device tree nodes for the same physical hub chip (e.g. one for the USB2 and another for the USB3 part). I suppose this could also be the case for non-hub devices. For hubs there is the 'peer-hub' device tree property to establish a link between the two USB devices, as a result the onboard driver only creates a single platform device (which is desired, otherwise two platform devices would be in charge for power sequencing the same phyiscal device. For non-hub devices there is currently no such link. In many cases I expect there will be just one DT entry even though the device has multiple USB interfaces, but it could happen and would actually be a more accurate representation. General support is already there (the code dealing with 'peer-hub'), but we'd have to come up with a suitable name. 'peer-device' is the first thing that comes to my mind, but there might be better options. If such a generic property is added then we should deprecate 'peer-hub', but maintain backwards compatibility.