Message ID | 20220119002438.106079-1-sean.anderson@seco.com |
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Return-Path: <linux-arm-msm-owner@kernel.org> X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 036B6C433F5 for <linux-arm-msm@archiver.kernel.org>; Wed, 19 Jan 2022 00:24:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1350425AbiASAY4 (ORCPT <rfc822;linux-arm-msm@archiver.kernel.org>); Tue, 18 Jan 2022 19:24:56 -0500 Received: from mail-vi1eur05on2052.outbound.protection.outlook.com ([40.107.21.52]:57574 "EHLO EUR05-VI1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S244782AbiASAYz (ORCPT <rfc822;linux-arm-msm@vger.kernel.org>); Tue, 18 Jan 2022 19:24:55 -0500 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=lFnl5GIB8PBb3jflwKo1U+eCZULFFX2XuEMgTERsED7avpzA9RsZ1XMzKMkeEJzpdCSO54d3X4VgkRU3MCrsm9onsKb6+WsriSv40L4/hk7DPUuysgvntQ0JUT63A4u1tUwXU0NVuwQvtFac7u/sjqrtUiBRQhG9QOtLQYJWvdQFMK4S4UnWI4tTpz0GzPMMtt2sa7XOx/gNM7vA3PgvfEKssI2i8pF7sZ698Y+CXr5so3yC2wer5vm6GMkLkeXK7/aCJrJ1a48aXQTgJSXXqOY+n3RK2agylesuT88rCey4I/GlRR3vC60v+ocY69nctzVEzoXsD6EfEegTfk4udg== ARC-Message-Signature: i=1; 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usb: dwc3: Calculate REFCLKPER et. al. from reference clock
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Hi Baruch, On 1/19/22 1:14 PM, Baruch Siach wrote: > Hi Sean, > > On Tue, Jan 18 2022, Sean Anderson wrote: >> This is a rework of patches 3-5 of [1]. It attempts to correctly program >> REFCLKPER and REFCLK_FLADJ based on the reference clock frequency. Since >> we no longer need a special property duplicating this configuration, >> snps,ref-clock-period-ns is deprecated. >> >> Please test this! Patches 3/4 in this series have the effect of >> programming REFCLKPER and REFCLK_FLADJ on boards which already configure >> the "ref" clock. I have build tested, but not much else. > > Tested here on IPQ6010 based system. USB still works. But the with "ref" > clock at 24MHz, period is calculated as 0x29. Previous > snps,ref-clock-period-ns value used to be 0x32. > > Is that expected? Yes. From the documentation for GFLADJ_REFCLK_240MHZ_DECR: > Examples: > If the ref_clk is 24 MHz then > - GUCTL.REF_CLK_PERIOD = 41 > - GFLADJ.GFLADJ_REFCLK_240MHZ_DECR = 240/24 = 10 And 41 == 0x29. --Sean