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: [v2] USB: serial: ftdi_sio: Improve the accuracy of the baud rate generator by using round-to-closest instead of truncating when calculating baud rate divisors. From: Johan Hovold Message-Id: <20181120165512.GF19900@localhost> Date: Tue, 20 Nov 2018 17:55:12 +0100 To: Nikolaj Fogh Cc: Johan Hovold , linux-usb@vger.kernel.org List-ID: T24gRnJpLCBOb3YgMTYsIDIwMTggYXQgMTA6NDQ6MjFQTSArMDEwMCwgTmlrb2xhaiBGb2doIHdy b3RlOgo+IEltcHJvdmUgYmF1ZC1yYXRlIGdlbmVyYXRpb24gYnkgdXNpbmcgcm91bmRpbmctdG8t Y2xvc2VzdCBpbnN0ZWFkIG9mCj4gdHJ1bmNhdGlvbiBpbiBkaXZpc29yIGNhbGN1bGF0aW9uLgo+ IAo+IFJlc3VsdHMgaGF2ZSBiZWVuIHZlcmlmaWVkIGJ5IGxvZ2ljIGFuYWx5emVyIG9uIGFuIEZU MjMyUlQgKDIzMkJNKSBjaGlwLgo+IFRoZSBmb2xsb3dpbmcgdGFibGUgc2hvd3MgdGhlIHdhbnRl ZCBiYXVkIHJhdGUsIHRoZSBiYXVkIHJhdGUgb2J0YWluZWQKPiB3aXRoIHRoZSBvbGQgbWV0aG9k ICh0cnVuY2F0aW9uKSwgd2l0aCB0aGUgbmV3IG1ldGhvZCAocm91bmRpbmcpIGFuZCB0aGUKPiBi YXVkIHJhdGUgZ2VuZXJhdGVkIGJ5IHRoZSB3aW5kb3dzIDEwIGRyaXZlci4gVGhlIG51bWJlcnMg aW4gcGFyZW50aGVzZXMKPiBpcyB0aGUgZXJyb3IuCj4gCj4gKy0gV2FudGVkIC0tKy0tLS0tLSBP bGQgLS0tLS0tLSstLS0tLS0gTmV3IC0tLS0tLS0rLS0tLS0tIFdpbiAtLS0tLS0tKwo+IHwgwqAg OTYwMMKgIMKgIHwgwqAgOTYwMMKgICgwLjAwJSnCoCB8wqDCoCA5NjA0wqAgKDAuMDUlKcKgIHzC oMKgIDk2MDUgKDAuMDUlKcKgIHwKPiB8IMKgIDE5MjAwIMKgIHwgwqAgMTkyMDAgKDAuMDAlKcKg IHzCoMKgIDE5MTk5ICgwLjAxJSnCoCB8wqDCoCAxOTE5OCAoMC4wMSUpwqAgfAo+IHwgwqAgMzg0 MDAgwqAgfCDCoCAzODM5NSAoMC4wMSUpwqAgfMKgwqAgMzg0MzEgKDAuMDglKcKgIHzCoMKgIDM4 Mzk0ICgwLjAyJSnCoCB8Cj4gfCDCoCA1NzYwMCDCoCB8IMKgIDU3NzI1ICgwLjIyJSnCoCB8wqDC oCA1NzU0MCAoMC4xMCUpwqAgfMKgwqAgNTc2NzMgKDAuMTMlKcKgIHwKPiB8wqAgMTE1MjAwIMKg IHzCoCAxMTUzMDcgKDAuMDklKcKgIHzCoCAxMTUzMzAgKDAuMTElKcKgIHzCoCAxMTUzMjAgKDAu MTAlKcKgIHwKPiB8wqAgOTIxNjAwIMKgIHzCoCA5MTk5NjMgKDAuMTglKcKgIHzCoCA5MjAzODYg KDAuMTMlKcKgIHzCoCA5MjA4MTAgKDAuMDklKcKgIHwKPiB8wqAgOTYxMjAwIMKgIHzCoCA5OTY1 MTIgKDMuNjclKcKgIHzCoCA5NTY0ODAgKDAuNDklKcKgIHzCoCA5NTY5MzcgKDAuNDQlKcKgIHwK PiArLS0tLS0tLS0tLS0rLS0tLS0tLS0tLS0tLS0tLS0tKy0tLS0tLS0tLS0tLS0tLS0tLSstLS0t LS0tLS0tLS0tLS0tLS0rCj4gCj4gVGhlIGVycm9yIGR1ZSB0byBub2lzZSBpbiB0aGUgbWVhc3Vy ZW1lbnRzIGlzIGluIHRoZSBvcmRlciBvZiBhIGZldwo+IHRlbnRocyBvZiBhICUuIEFzIGNhbiBi ZSBzZWVuLCB0aGUgYmF1ZCByYXRlIGZvciA5NjEyMDAgaXMgc2lnbmlmaWNhbnRseQo+IGltcHJv dmVkIGZvciBzb21lIHJhdGVzLCBhbmQgY29ycmVzcG9uZHMgdG8gdGhlIG91dHB1dCBnaXZlbiBi eSB0aGUKPiB3aW5kb3dzIGRyaXZlci4KPiAKPiBUaGUgdGhlb3JldGljYWwgYmF1ZCByYXRlIGhh cyBiZWVuIGNhbGN1bGF0ZWQgZm9yIGFsbCBiYXVkIHJhdGVzIGZyb20gMQo+IHRvIDNNLCBhbmQg YXMgZXhwZWN0ZWQsIHRoZSBlcnJvciBpcyBjZW50ZXJlZCBhcm91bmQgMCwgd2l0aCBhIHRyaWFu Z2xlCj4gc2hhcGUgaW5zdGVhZCBvZiBhIHNhd3Rvb3RoLCBzbyB0aGUgbWF4aW11bSBlcnJvciBp cyBkZWNyZWFzZWQgdG8gaGFsZi4KPiAKPiBTaWduZWQtb2ZmLWJ5OiBOaWtvbGFqIEZvZ2ggPG5p a29sYWpmb2doQGdtYWlsLmNvbT4KClRoYW5rcyBmb3IgdXBkYXRlZCBjb21taXQgbWVzc2FnZS4g SSB3YXMganVzdCBhYm91dCB0byBhcHBseSBpdCwgYnV0CmNoZWNrcGF0Y2ggcmVwb3J0ZWQgdGhh dCB0aGUgU2lnbmVkLW9mZiBhZGRyZXNzIGRvZXNuJ3QgbWF0Y2ggdGhlIGF1dGhvcgphZGRyZXNz IChGcm9tKS4gV291bGQgeW91IG1pbmQgZml4aW5nIHRoYXQgdXA/CgpBbHNvLCBwbGVhc2UgdXNl IGEgbGVzcyB2ZXJib3NlIHN1YmplY3QgKHBhdGNoIHN1bW1hcnkpLCB0cnkgdG8gbWFrZSBpdApm aXQgd2l0aGluIDcyIGNvbHMgb3Igc28uCgpUaGFua3MsCkpvaGFuCg==