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=-2.6 required=3.0 tests=DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,T_DKIM_INVALID, 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 AE6F9ECDFB0 for ; Fri, 13 Jul 2018 09:53:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 66E3A20842 for ; Fri, 13 Jul 2018 09:53:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="LYagyxnV"; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="FpnFaup2" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 66E3A20842 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728140AbeGMKHR (ORCPT ); Fri, 13 Jul 2018 06:07:17 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:49202 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726789AbeGMKHQ (ORCPT ); Fri, 13 Jul 2018 06:07:16 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 5A04960555; Fri, 13 Jul 2018 09:53:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1531475601; bh=ku1t/oStNkUqIu5vcHW2erKw0hVV0k84ZuaEjXPgGQ0=; h=From:To:Cc:Subject:Date:From; b=LYagyxnV/rHnBlIXIMkBUsOnSi9OIaN+Y9KKPuUDS66XdaL3iWyoRhi8sDL/0vpNz SWnDYPYs48NaGDRzFh+1ObmoyLjUdiUMYLMJG8fGQu0pmUMNfLJmoVm/X4gt52Cd5L 1Asb7m6wKHcG/iDexIHkQfUTnNQ36ZJ3ytGw1UXs= Received: from sayalil-linux.qualcomm.com (blr-c-bdr-fw-01_globalnat_allzones-outside.qualcomm.com [103.229.19.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: sayalil@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 0079560271; Fri, 13 Jul 2018 09:53:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1531475600; bh=ku1t/oStNkUqIu5vcHW2erKw0hVV0k84ZuaEjXPgGQ0=; h=From:To:Cc:Subject:Date:From; b=FpnFaup2c0q82cmYsv72RnkOylWmO/TNlO/T56PtrqfdUZyhNropW6oXCGnTyC/O8 9r+CXsZ19JzJjSZwZXuJ7zi6D/GX8N/vP6tBZtqQkjGAdd12n5pxOiLuySkX+SyOMf 0qw2ENag/xlVJ9D3He6pvhVJe342aBPuCY4kEdw8= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 0079560271 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=sayalil@codeaurora.org From: Sayali Lokhande To: adrian.hunter@intel.com, ulf.hansson@linaro.org, robh+dt@kernel.org, mark.rutland@arm.com Cc: linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, shawn.lin@rock-chips.com, linux-arm-msm@vger.kernel.org, georgi.djakov@linaro.org, devicetree@vger.kernel.org, asutoshd@codeaurora.org, stummala@codeaurora.org, venkatg@codeaurora.org, vviswana@codeaurora.org, bjorn.andersson@linaro.org, riteshh@codeaurora.org, vbadigan@codeaurora.org, sayalil@codeaurora.org Subject: [PATCH RFC 0/7] Add devfreq based clock scaling support for mmc Date: Fri, 13 Jul 2018 15:22:56 +0530 Message-Id: <1531475583-7050-1-git-send-email-sayalil@codeaurora.org> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This change adds the use of devfreq based clock scaling to MMC. Both eMMC and SD card can use it. For some workloads, such as video playback, it isn't necessary for these cards to run at high speed. Running at lower frequency, in such cases can still meet the deadlines for data transfers. Scaling down the clock frequency dynamically has power savings not only because the bus is running at lower frequency but also has an advantage of scaling down the system core voltage, if supported. Provide an ondemand clock scaling support similar to the cpufreq ondemand governor having two thresholds, up_threshold and down_threshold to decide whether to increase the frequency or scale it down respectively as per load. Sahitya Tummala (1): devfreq: Add new flag to do simple clock scaling Sayali Lokhande (6): mmc: core: devfreq: Add devfreq based clock scaling support mmc: core: Add sysfs entries for dynamic control of clock scaling mmc: core: add support for devfreq suspend/resume mmc: sdhci-msm: Kconfig: select devfreq ondemand for sdhci-msm mmc: sdhci-msm: Enable clock scaling property mmc: core: Add a debugfs entry to set max clock rate .../devicetree/bindings/mmc/sdhci-msm.txt | 10 + Documentation/mmc/mmc-dev-attrs.txt | 38 ++ drivers/devfreq/governor_simpleondemand.c | 25 +- drivers/mmc/core/core.c | 672 +++++++++++++++++++++ drivers/mmc/core/core.h | 9 + drivers/mmc/core/debugfs.c | 90 +++ drivers/mmc/core/host.c | 163 ++++- drivers/mmc/core/mmc.c | 227 ++++++- drivers/mmc/core/sd.c | 85 ++- drivers/mmc/host/Kconfig | 2 + drivers/mmc/host/sdhci-msm.c | 38 ++ drivers/mmc/host/sdhci-pltfm.c | 11 + drivers/mmc/host/sdhci.c | 27 + drivers/mmc/host/sdhci.h | 8 + include/linux/devfreq.h | 4 + include/linux/mmc/card.h | 5 + include/linux/mmc/host.h | 70 +++ 17 files changed, 1475 insertions(+), 9 deletions(-) -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project