From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,UNPARSEABLE_RELAY,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D8E1FC43387 for ; Wed, 2 Jan 2019 14:01:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AE0E5218EA for ; Wed, 2 Jan 2019 14:01:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730027AbfABOBH (ORCPT ); Wed, 2 Jan 2019 09:01:07 -0500 Received: from mailgw01.mediatek.com ([210.61.82.183]:26590 "EHLO mailgw01.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1729397AbfABOBG (ORCPT ); Wed, 2 Jan 2019 09:01:06 -0500 X-UUID: ab0098f85fe94414bb84c00bc6df16a7-20190102 X-UUID: ab0098f85fe94414bb84c00bc6df16a7-20190102 Received: from mtkcas06.mediatek.inc [(172.21.101.30)] by mailgw01.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 1555353887; Wed, 02 Jan 2019 22:00:57 +0800 Received: from mtkcas09.mediatek.inc (172.21.101.178) by mtkmbs02n1.mediatek.inc (172.21.101.77) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Wed, 2 Jan 2019 22:00:55 +0800 Received: from mtkslt205.mediatek.inc (10.21.15.75) by mtkcas09.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Wed, 2 Jan 2019 22:00:56 +0800 From: Henry Chen To: Viresh Kumar , Stephen Boyd , Rob Herring , Matthias Brugger , Ulf Hansson CC: Mark Rutland , Fan Chen , Weiyi Lu , James Liao , Kees Cook , , , , , Subject: [RFC PATCH 0/7] Add driver for dvfsrc and add support for active state of scpsys on mt8183 Date: Wed, 2 Jan 2019 21:43:57 +0800 Message-ID: <1546436644-19234-1-git-send-email-henryc.chen@mediatek.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 Content-Type: text/plain X-MTK: N Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The patchsets add support for MediaTek hardware module named DVFSRC (dynamic voltage and frequency scaling resource collector). The DVFSRC is a HW module which is used to collect all the requests from both software and hardware and turn into the decision of minimum operating voltage and minimum DRAM frequency to fulfill those requests. So, This series is to implement the dvfsrc driver to collect all the requests of operating voltage or DRAM bandwidth from other device drivers likes GPU/Camera through 2 frameworks basically: 1. PM_QOS_MEMORY_BANDWIDTH from PM QOS: to aggregate the bandwidth requirements from different clients 2. Active state management of power domains[1]: to handle the operating voltage opp requirement from different power domains [1] https://lwn.net/Articles/744047/