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received-spf: None (protection.outlook.com: synaptics.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: CL/PxYDKg/lg1KSeZL4jxd4actSkzMJPJRpzauN9KtjaAiiVXiR16cXuLnigXBnndnuwWLqw7QelBqRTIPgr9Mgf207LGSTosAqqseQC1NYlmCpsK0Ob0d/0Vnvi47si2tkk3FRaU3d8KUQDp/s6Y5lh1e2ABEjdigEjQXuCzhIuYt5cGYCSMJL2kU+bDaOf5VnFi4zg+qkJYhdAYvuAm2e40IMALTGeCrPY3N0HWf8tdcoTH8q1LxlDO6cZrkScqqo+oN1+rABqEjpuIdEwI226B0WZesd0cv+VfysXz77/1Be43LI8X7WIBGWRQkTakFBrnVFtpFHnDS3I4MxTrGCLFVh2v/3l8x1lJ0+bxGGtitkXd0Y7navilu/TarrCOr/x0cIAW3q3eaDg8d7buJ2VBUdq1ADPeUr0Ot4G7/4= Content-Type: text/plain; charset="us-ascii" Content-ID: <815A5D02BFA1D849BE4FC20BB647DA70@namprd03.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: synaptics.com X-MS-Exchange-CrossTenant-Network-Message-Id: 51bdbe40-abfb-4ecf-18e2-08d6bd9822fe X-MS-Exchange-CrossTenant-originalarrivaltime: 10 Apr 2019 09:37:24.5644 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 335d1fbc-2124-4173-9863-17e7051a2a0e X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR03MB3991 Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org On Tue, 9 Apr 2019 09:28:16 +0000 Minas Harutyunyan wrote: >=20 > Hi Stefan, >=20 > > Hi Minas, > > > > Am 09.04.19 um 08:54 schrieb Jisheng Zhang: =20 > >> On Mon, 8 Apr 2019 16:05:51 +0800 Jisheng Zhang wrote: > >> =20 > >>> Hi Stefan, > >>> > >>> On Mon, 8 Apr 2019 09:57:14 +0200 Stefan Wahren wrote: > >>> =20 > >>>> > >>>> Hi Jisheng, > >>>> > >>>> > >>>> thanks for sending this patch. I already reported this issue > >>>> last year [1], but Microchip wasn't able to provide a fix. > >>>> > >>>> I will give it a try. > >>>> =20 > >>>>> The second one: 8000 usb interrupts per second when idle. > >>>>> This is abnormal. any idea? Is it due to the lan78xx? =20 > >>>> Does this downstream patch [2] improve your situation? =20 > >>> Thanks a lot. Will try the patch tonight. =20 > >> I tried this patch, it doesn't help. One more observation: if I > >> ifconfig eth0 down, I can still get 8000 usb interrupts per second. > >> Not sure whether this is usb issue or not. =20 > > > > Jisheng reports a lot of USB interrupts while the lan78xx driver on > > Raspberry Pi 3B+ is in idle. > > > > Any suggestions to narrow this down? =20 >=20 > dwc2 in host mode enable SOF interrupts if any periodic EP are in use. > So, 8000 interrupts per second is expectant behavior. Makes sense. 8 microframes each 1ms, so 8*1000 =3D 8000 interrupts/s