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([2001:a61:1373:4b01:cc61:7bc9:bea5:a415]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48730688694sm183170845e9.11.2026.03.30.10.39.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 30 Mar 2026 10:39:43 -0700 (PDT) Message-ID: <1c660862-de30-428d-a772-8bee9b990a59@suse.com> Date: Mon, 30 Mar 2026 19:39:42 +0200 Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next 3/3] net: usb: smsc95xx: suspend PHY during USB suspend To: Parthiban Veerasooran , piergiorgio.beruto@gmail.com, andrew@lunn.ch, hkallweit1@gmail.com, linux@armlinux.org.uk, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, steve.glendinning@shawell.net, UNGLinuxDriver@microchip.com Cc: netdev@vger.kernel.org, linux-usb@vger.kernel.org References: <20260330134222.67597-1-parthiban.veerasooran@microchip.com> <20260330134222.67597-4-parthiban.veerasooran@microchip.com> Content-Language: en-US From: Oliver Neukum In-Reply-To: <20260330134222.67597-4-parthiban.veerasooran@microchip.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 30.03.26 15:42, Parthiban Veerasooran wrote: > The smsc95xx driver registers a PHY device but does not currently > propagate suspend events to it when the USB interface is suspended. > > Call phy_suspend() from the driver's suspend callback so the attached > PHY can properly enter low-power state during system or runtime > suspend. This aligns smsc95xx suspend handling with other network > drivers that manage an external or integrated PHY. > > Without this, the PHY may remain active and fail to execute its own > suspend procedure, leading to unnecessary power consumption or > incorrect resume behavior. > > This change is also required for the EVB-LAN8670-USB Rev.D0 device to > support OATC10-compliant sleep and wake functionality. > > Signed-off-by: Parthiban Veerasooran > --- > drivers/net/usb/smsc95xx.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c > index 42e4048b574b..3a6e03b7410a 100644 > --- a/drivers/net/usb/smsc95xx.c > +++ b/drivers/net/usb/smsc95xx.c > @@ -1550,6 +1550,12 @@ static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message) > > pdata->pm_task = current; > > + if (pdata->phydev) { > + ret = phy_suspend(pdata->phydev); > + if (ret) > + return ret; > + } At this point you have suspended the phy. Hence the device can no longer transmit > + > ret = usbnet_suspend(intf, message); This wants to 1. drain the queue if you do runtime PM 2. can return -EBUSY > if (ret < 0) { > netdev_warn(dev->net, "usbnet_suspend error\n"); And here it will return in the error case. With the phy already suspended. And, as a question of principle: Why do you suspend the phy in suspend(), but take no action in resume()? Regards Oliver