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=-2.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,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 9471BC43441 for ; Mon, 12 Nov 2018 06:38:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4D0392175B for ; Mon, 12 Nov 2018 06:38:59 +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="Yw5aJb5G"; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="olkDozlU" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4D0392175B 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 S1731812AbeKLQat (ORCPT ); Mon, 12 Nov 2018 11:30:49 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:42826 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728224AbeKLQas (ORCPT ); Mon, 12 Nov 2018 11:30:48 -0500 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 1DBC660866; Mon, 12 Nov 2018 06:38:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1542004737; bh=Wr0zzxg+xLJxQlm7qy0mjg5Dhg7NvDS7hc/9/HIf/28=; h=From:To:Cc:Subject:Date:From; b=Yw5aJb5G53106UZZxY4e/3BVdf4QuXd96H35Hf651BSfuZnLiU+y+ihjAySsihIja xNqC0mKCDTGsIr8gPKqs6E2/MCFvdF3pnTOSDYzjzWhlGvgbqzjHhNBbyOWuLHTbOj T/XdwYg8B0JILqAgbhlkBkh2ooilDRakjnPn2Mvk= Received: from vbadigan-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: vbadigan@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 7C70B60600; Mon, 12 Nov 2018 06:38:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1542004736; bh=Wr0zzxg+xLJxQlm7qy0mjg5Dhg7NvDS7hc/9/HIf/28=; h=From:To:Cc:Subject:Date:From; b=olkDozlUedWc73JJHqQI5RvEM+l8RGXndIScdeYTgsSt3FNXLs3Ny9XbuEd/ajbpq HS84Y4PZeZZGBJmvzADHgX0Mv+gOEpHDKjTmktqyaJNwBRrZLE8TDn3D1JBwjI3HZD u2LsNOFRrMZoXJ9W9sCbSXRbW/zUXhWug6+T8h5g= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 7C70B60600 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=vbadigan@codeaurora.org From: Veerabhadrarao Badiganti To: adrian.hunter@intel.com, ulf.hansson@linaro.org, robh+dt@kernel.org, evgreen@chromium.org, dianders@google.com Cc: asutoshd@codeaurora.org, riteshh@codeaurora.org, stummala@codeaurora.org, sayalil@codeaurora.org, linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, Veerabhadrarao Badiganti Subject: [PATCH V2 0/2] Re-initialize DLL when MCLK is gated dynamically Date: Mon, 12 Nov 2018 12:08:22 +0530 Message-Id: <1542004704-17066-1-git-send-email-vbadigan@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 On few SDHCI-MSM controllers, the host controller's clock tuning circuit may go out of sync if controller clocks are gated which eventually, result in data CRC and command CRC/timeout errors. To fix this issue, the DLL needs to be re-initialized and restored with its old settings once clocks are ungated. SDHC cotroller on SDM845 SOC has this limitation. Changes since V3: - Introduced SoC specific dt compatible string for sdhci-msm controller - Moved the condition which checks whether tuning is needed or not, to a common function. Changes since V2: - Removed an unused variable. - Renamed the newly introduced flags to be more meaningful. - Added new dt compatible string for SDM845 SOC. Changes since V1: - Replaced dt flag with a dt compatible string to indicate SHDCI-MSM controller varients which need this fix. - Moved the DLL settings restoration logic from request context to platform driver runtime pm context. Tested on: sdm845 Veerabhadrarao Badiganti (2): dt-bindings: mmc: sdhci-msm: Add SoC-specific compatible strings mmc: sdhci-msm: Re-initialize DLL if MCLK is gated dynamically .../devicetree/bindings/mmc/sdhci-msm.txt | 21 ++++-- drivers/mmc/host/sdhci-msm.c | 78 +++++++++++++++++++--- 2 files changed, 84 insertions(+), 15 deletions(-) -- Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.