From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Subject: [6/6] usb: musb: Decrease URB starting latency in musb_advance_schedule() From: "Matwey V. Kornilov" Message-Id: <20190403185310.8437-7-matwey@sai.msu.ru> Date: Wed, 3 Apr 2019 21:53:10 +0300 To: b-liu@ti.com, gregkh@linuxfoundation.org Cc: matwey.kornilov@gmail.com, "Matwey V. Kornilov" , linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org List-ID: UHJldmlvdXNseSwgdGhlIGFsZ29yaXRobSB3YXMgdGhlIGZvbGxvd2luZzoKCiAxLiBnaXZlYmFj ayBjdXJyZW50IFVSQgogMi4gaWYgY3VycmVudCBxaCBpcyBub3QgZW1wdHkKICAgIHRoZW4gc3Rh cnQgbmV4dCBVUkIKIDMuIGlmIGN1cnJlbnQgcWggaXMgZW1wdHkKICAgIHRoZW4gZGlzcG9zZSB0 aGUgcWgsIGZpbmQgbmV4dCBxaCBpZiBhbnksIGFuZCBzdGFydCBVUkIuCgpJdCBtYXkgdGFrZSBh IHdoaWxlIHRvIHJ1biB1cmItPmNhbGxiYWNrIGluc2lkZSBVUkIgZ2l2ZWJhY2sgd2hpY2ggaXMK cnVuIHN5bmNocm9ub3VzbHkgaW4gbXVzYi4gSW4gb3JkZXIgdG8gaW1wcm92ZSB0aGUgbGF0ZW5j eSB3ZSByZWFycmFuZ2UKdGhlIGZ1bmN0aW9uIGJlaGF2aW91ciBmb3IgdGhlIGNhc2Ugd2hlbiBx aCBpcyBub3QgZW1wdHk6IG5leHQgVVJCIGlzCnN0YXJ0ZWQgYmVmb3JlIFVSQiBnaXZlYmFjay4g V2hlbiBxaCBpcyBlbXB0eSB0aGVuIHRoZSBiZWhhdmlvdXIgaXMKaW50ZW50aW9uYWxseSBrZXB0 IGluIG9yZGVyIG5vdCB0byBicmVhayBleGlzdGluZyBpbnRlciBxaCBzY2hlZHVsaW5nOgpVUkIg Z2l2ZWJhY2sgY291bGQgcG90ZW50aW9uYWxseSBlbnF1ZXVlIG90aGVyIFVSQiB0byB0aGUgZW1w dHkgcWgKcHJldmVudGluZyBpdCBmcm9tIGJlaW5nIGRpc3Bvc2VkLgoKQmVmb3JlIHRoaXMgcGF0 Y2gsIHRpbWUgc3BlbnQgaW4gdXJiLT5jYWxsYmFjayBsZWQgdG8gdGhlIGZvbGxvd2luZwpnbGl0 Y2hlcyBiZXR3ZWVuIHRoZSBob3N0IGFuZCBhIGh1YiBkdXJpbmcgaXNvYyB0cmFuc2ZlciAobGlu ZSA0KToKCiAgICAxMS42MjQ0OTIgZD0gIDAuMDAwMTI0IFsxMzAuNiArICAxLjA1MF0gWyAgNF0g U1BMSVQKICAgIDExLjYyNDQ5MiBkPSAgMC4wMDAwMDAgWzEzMC42ICsgIDEuNDY3XSBbICAzXSBJ TiAgIDogMy41CiAgICAxMS42MjQ0OTMgZD0gIDAuMDAwMDAwIFsxMzAuNiArICAxLjk2N10gWyAz N10gREFUQTA6IGFhIDA4IFtza2lwcGVkLi4uXQogICAgMTEuNjI1NjE3IGQ9ICAwLjAwMTEyNCBb MTMxLjcgKyAgMS4wNTBdIFsgIDRdIFNQTElUCiAgICAxMS42MjU2MTcgZD0gIDAuMDAwMDAwIFsx MzEuNyArICAxLjQ2N10gWyAgM10gSU4gICA6IDMuNQogICAgMTEuNjI1ODY3IGQ9ICAwLjAwMDI1 MCBbMTMyLjEgKyAgMS4wNTBdIFsgIDRdIFNQTElUCiAgICAxMS42MjU4NjcgZD0gIDAuMDAwMDAw IFsxMzIuMSArICAxLjQ2N10gWyAgM10gSU4gICA6IDMuNQogICAgMTEuNjI1ODY4IGQ9ICAwLjAw MDAwMSBbMTMyLjEgKyAgMS45ODNdIFsgIDNdIERBVEEwOiAwMCAwMAogICAgMTEuNjI2NjE3IGQ9 ICAwLjAwMDc0OSBbMTMyLjcgKyAgMS4wNTBdIFsgIDRdIFNQTElUCiAgICAxMS42MjY2MTcgZD0g IDAuMDAwMDAwIFsxMzIuNyArICAxLjQ2N10gWyAgM10gSU4gICA6IDMuNQogICAgMTEuNjI2ODY3 IGQ9ICAwLjAwMDI1MCBbMTMzLjEgKyAgMS4wNTBdIFsgIDRdIFNQTElUCiAgICAxMS42MjY4Njcg ZD0gIDAuMDAwMDAwIFsxMzMuMSArICAxLjQ2N10gWyAgM10gSU4gICA6IDMuNQogICAgMTEuNjI2 ODY4IGQ9ICAwLjAwMDAwMCBbMTMzLjEgKyAgMS45NjddIFsgIDNdIERBVEEwOiAwMCAwMAoKQWZ0 ZXIgdGhlIGh1YiwgdGhleSBsb29rIGFzIHRoZSBmb2xsb3dpbmcgYW5kIG1heSBsZWFkIHRvIGJy b2tlbgpwZXJlcGhlcmlhbCB0cmFuc2ZlciAoYXMgaW4gY2FzZSBvZiBQV0MgYmFzZWQgd2ViY2Ft KToKCiAgICAxMS4zMzIwMDQgZD0gIDAuMDAwOTk3IFsgMzAuMCArICAzLjQxN10gWyAgM10gSU4g ICA6IDUuNQogICAgMTEuMzMyMDA3IGQ9ICAwLjAwMDAwMyBbIDMwLjAgKyAgNi44MzNdIFs4MDBd IERBVEEwOiA4YSAxYyBbc2tpcHBlZC4uLl0KICAgIDExLjMzNDAwNCBkPSAgMC4wMDE5OTcgWyAz Mi4wICsgIDMuNDE3XSBbICAzXSBJTiAgIDogNS41CiAgICAxMS4zMzQwMDcgZD0gIDAuMDAwMDAz IFsgMzIuMCArICA2Ljc1MF0gWyAgM10gREFUQTA6IDAwIDAwCiAgICAxMS4zMzUwMDQgZD0gIDAu MDAwOTk3IFsgMzMgICArICAzLjQxN10gWyAgM10gSU4gICA6IDUuNQogICAgMTEuMzM1MDA3IGQ9 ICAwLjAwMDAwMyBbIDMzICAgKyAgNi43NTBdIFsgIDNdIERBVEEwOiAwMCAwMAoKUmVtb3Zpbmcg dGhpcyBnbGl0Y2hlcyBtYWtlcyB1cyBhYmxlIHRvIHN1Y2Nlc3NmdWxseSBydW4gMTBmcHMKdmlk ZW8gc3RyZWFtIGZyb20gdGhlIHdlYmNhbSBhdHRhY2hlZCB2aWEgVVNCIGh1Yi4gVGhhdCB3YXMK cHJldmlvdXNseSBpbXBvc3NpYmxlLgoKU2lnbmVkLW9mZi1ieTogTWF0d2V5IFYuIEtvcm5pbG92 IDxtYXR3ZXlAc2FpLm1zdS5ydT4KLS0tCiBkcml2ZXJzL3VzYi9tdXNiL211c2JfaG9zdC5jIHwg MTggKysrKysrKysrKysrKysrKysrCiAxIGZpbGUgY2hhbmdlZCwgMTggaW5zZXJ0aW9ucygrKQoK ZGlmZiAtLWdpdCBhL2RyaXZlcnMvdXNiL211c2IvbXVzYl9ob3N0LmMgYi9kcml2ZXJzL3VzYi9t dXNiL211c2JfaG9zdC5jCmluZGV4IGVkOTllY2Q0ZTYzYS4uNzViZTkyODczYjViIDEwMDY0NAot LS0gYS9kcml2ZXJzL3VzYi9tdXNiL211c2JfaG9zdC5jCisrKyBiL2RyaXZlcnMvdXNiL211c2Iv bXVzYl9ob3N0LmMKQEAgLTg1LDYgKzg1LDExIEBAIHN0YXRpYyBib29sIG11c2JfcWhfZW1wdHko c3RydWN0IG11c2JfcWggKnFoKQogCXJldHVybiBsaXN0X2VtcHR5KCZxaC0+aGVwLT51cmJfbGlz dCk7CiB9CiAKK3N0YXRpYyBib29sIG11c2JfcWhfc2luZ3VsYXIoc3RydWN0IG11c2JfcWggKnFo KQoreworCXJldHVybiBsaXN0X2lzX3Npbmd1bGFyKCZxaC0+aGVwLT51cmJfbGlzdCk7Cit9CisK IHN0YXRpYyB2b2lkIG11c2JfcWhfdW5saW5rX2hlcChzdHJ1Y3QgbXVzYl9xaCAqcWgpCiB7CiAJ aWYgKCFxaC0+aGVwKQpAQCAtMzYyLDYgKzM2NywxOSBAQCBzdGF0aWMgdm9pZCBtdXNiX2FkdmFu Y2Vfc2NoZWR1bGUoc3RydWN0IG11c2IgKm11c2IsIHN0cnVjdCB1cmIgKnVyYiwKIAkJYnJlYWs7 CiAJfQogCisJaWYgKHJlYWR5ICYmICFtdXNiX3FoX3Npbmd1bGFyKHFoKSkgeworCQlzdHJ1Y3Qg dXJiICpuZXh0X3VyYiA9IGxpc3RfbmV4dF9lbnRyeSh1cmIsIHVyYl9saXN0KTsKKworCQltdXNi X2RiZyhtdXNiLCAiLi4uIG5leHQgZXAlZCAlY1ggdXJiICVwIiwgaHdfZXAtPmVwbnVtLCBpc19p biA/ICdSJyA6ICdUJywgbmV4dF91cmIpOworCQltdXNiX3N0YXJ0X3VyYihtdXNiLCBpc19pbiwg cWgsIG5leHRfdXJiKTsKKworCQlxaC0+aXNfcmVhZHkgPSAwOworCQltdXNiX2dpdmViYWNrKG11 c2IsIHVyYiwgc3RhdHVzKTsKKwkJcWgtPmlzX3JlYWR5ID0gcmVhZHk7CisKKwkJcmV0dXJuOwor CX0KKwogCXFoLT5pc19yZWFkeSA9IDA7CiAJbXVzYl9naXZlYmFjayhtdXNiLCB1cmIsIHN0YXR1 cyk7CiAJcWgtPmlzX3JlYWR5ID0gcmVhZHk7Cg==