From patchwork Fri Feb 7 08:01:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Veerabhadrarao Badiganti X-Patchwork-Id: 11369949 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 89BCE112B for ; Fri, 7 Feb 2020 08:02:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 68BB0214AF for ; Fri, 7 Feb 2020 08:02:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="KFzZ1Qw8" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726136AbgBGICo (ORCPT ); Fri, 7 Feb 2020 03:02:44 -0500 Received: from mail26.static.mailgun.info ([104.130.122.26]:45174 "EHLO mail26.static.mailgun.info" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726899AbgBGICo (ORCPT ); Fri, 7 Feb 2020 03:02:44 -0500 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1581062564; h=Message-Id: Date: Subject: Cc: To: From: Sender; bh=+F/pt2udyfg8s5WZPxDIux8J3Re3GcC64qVLQuWUVp0=; b=KFzZ1Qw81smZYLagNxfIKFKNYao0+FkG4Z5HYnsn2I0i+yu1ljqu2UwZJR5Hggf6NYCSBOW/ pgAaOtWn7ow+WHKBaF3KnCM9yzjJC0j79mElypKTHZRhdEsbtQqiOgnLWTmvQk0DgJolLb0O LLvjRI+97SERUFbO7wNcdZP0XT0= X-Mailgun-Sending-Ip: 104.130.122.26 X-Mailgun-Sid: WyJiYTcxMiIsICJsaW51eC1tbWNAdmdlci5rZXJuZWwub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by mxa.mailgun.org with ESMTP id 5e3d199d.7f53358e2998-smtp-out-n01; Fri, 07 Feb 2020 08:02:37 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 559BFC447A3; Fri, 7 Feb 2020 08:02:36 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-caf-mail-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=2.0 tests=ALL_TRUSTED,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.0 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) by smtp.codeaurora.org (Postfix) with ESMTPSA id 940BAC43383; Fri, 7 Feb 2020 08:02:31 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 940BAC43383 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=vbadigan@codeaurora.org From: Veerabhadrarao Badiganti To: ulf.hansson@linaro.org, adrian.hunter@intel.com Cc: asutoshd@codeaurora.org, stummala@codeaurora.org, sayalil@codeaurora.org, cang@codeaurora.org, rampraka@codeaurora.org, linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, Ritesh Harjani , Veerabhadrarao Badiganti , Andy Gross , Bjorn Andersson Subject: [PATCH V1] mmc: sdhci-msm: Don't enable PWRSAVE_DLL for certain sdhc hosts Date: Fri, 7 Feb 2020 13:31:56 +0530 Message-Id: <1581062518-11655-1-git-send-email-vbadigan@codeaurora.org> X-Mailer: git-send-email 1.9.1 Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org From: Ritesh Harjani SDHC core with new 14lpp and later tech DLL should not enable PWRSAVE_DLL since such controller's internal gating cannot meet following MCLK requirement: When MCLK is gated OFF, it is not gated for less than 0.5us and MCLK must be switched on for at-least 1us before DATA starts coming. Adding support for this requirement. Signed-off-by: Ritesh Harjani Signed-off-by: Veerabhadrarao Badiganti --- drivers/mmc/host/sdhci-msm.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c index c3a160c..f27f891 100644 --- a/drivers/mmc/host/sdhci-msm.c +++ b/drivers/mmc/host/sdhci-msm.c @@ -977,9 +977,21 @@ static int sdhci_msm_cm_dll_sdc4_calibration(struct sdhci_host *host) goto out; } - config = readl_relaxed(host->ioaddr + msm_offset->core_vendor_spec3); - config |= CORE_PWRSAVE_DLL; - writel_relaxed(config, host->ioaddr + msm_offset->core_vendor_spec3); + /* + * Set CORE_PWRSAVE_DLL bit in CORE_VENDOR_SPEC3. + * When MCLK is gated OFF, it is not gated for less than 0.5us + * and MCLK must be switched on for at-least 1us before DATA + * starts coming. Controllers with 14lpp and later tech DLL cannot + * guarantee above requirement. So PWRSAVE_DLL should not be + * turned on for host controllers using this DLL. + */ + if (msm_host->use_14lpp_dll_reset) { + config = readl_relaxed(host->ioaddr + + msm_offset->core_vendor_spec3); + config |= CORE_PWRSAVE_DLL; + writel_relaxed(config, host->ioaddr + + msm_offset->core_vendor_spec3); + } /* * Drain writebuffer to ensure above DLL calibration