From patchwork Mon Nov 7 11:24:28 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ritesh Harjani X-Patchwork-Id: 9414767 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 8391260512 for ; Mon, 7 Nov 2016 11:26:04 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 73FCC28BCC for ; Mon, 7 Nov 2016 11:26:04 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 68E7D28BE0; Mon, 7 Nov 2016 11:26:04 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D09A428BDA for ; Mon, 7 Nov 2016 11:26:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752544AbcKGL0B (ORCPT ); Mon, 7 Nov 2016 06:26:01 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:60722 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751541AbcKGL0A (ORCPT ); Mon, 7 Nov 2016 06:26:00 -0500 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 9BE446120C; Mon, 7 Nov 2016 11:25:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1478517959; bh=XRQycsXHu0bulQJ6x29pwHE9o4qzC8U9LNAu16boXFw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NZb+MzqVNXEBDGaL9bU7cyjg67RAtub91YnuwKERwB8LxiDBqRuiO6rDWd5WuG7zS /QLEhkhgOQ2imEIJCH9d4QCElzr+YPuVlfwMBOp3t3e+4oePsOPl/V1u5kctSK1jb9 TQGfmrXq6xWkkiySPYaz+NwA8mMqzXYpn4eseO8k= Received: from rharjani-linux.qualcomm.com (unknown [202.46.23.54]) (using TLSv1.1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: riteshh@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 4BFC2606DC; Mon, 7 Nov 2016 11:25:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1478517958; bh=XRQycsXHu0bulQJ6x29pwHE9o4qzC8U9LNAu16boXFw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KHRHPrsA0hC2Kv0ebqhWo0iME08ofVRaza8FXBnocJUIcjQzE5RpJlNbxx/m1FjEp o17a+SFbUphmbBk5fLohvfWKehG1+e3Iv1maRmnjjGDTGg6vWP5X1f/Fj7WTP0K0Gs rM5sKDtJnM/VTGexZkRhFwLroVTtwSDt3qtEPWkI= DMARC-Filter: OpenDMARC Filter v1.3.1 smtp.codeaurora.org 4BFC2606DC Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=pass smtp.mailfrom=riteshh@codeaurora.org From: Ritesh Harjani To: ulf.hansson@linaro.org, linux-mmc@vger.kernel.org, adrian.hunter@intel.com, shawn.lin@rock-chips.com, sboyd@codeaurora.org Cc: devicetree@vger.kernel.org, linux-clk@vger.kernel.org, david.brown@linaro.org, andy.gross@linaro.org, linux-arm-msm@vger.kernel.org, georgi.djakov@linaro.org, alex.lemberg@sandisk.com, mateusz.nowak@intel.com, Yuliy.Izrailov@sandisk.com, asutoshd@codeaurora.org, kdorfman@codeaurora.org, david.griego@linaro.org, stummala@codeaurora.org, venkatg@codeaurora.org, rnayak@codeaurora.org, pramod.gurav@linaro.org, Ritesh Harjani Subject: [PATCH v6 05/14] mmc: sdhci-msm: Update DLL reset sequence Date: Mon, 7 Nov 2016 16:54:28 +0530 Message-Id: <1478517877-23733-6-git-send-email-riteshh@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1478517877-23733-1-git-send-email-riteshh@codeaurora.org> References: <1478517877-23733-1-git-send-email-riteshh@codeaurora.org> Sender: linux-clk-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Venkat Gopalakrishnan SDCC core with minor version >= 0x42 introduced new 14lpp DLL. This has additional requirements in the reset sequence for DLL tuning. Make necessary changes as needed. Without this patch we see below errors on such SDHC controllers sdhci_msm 7464900.sdhci: mmc0: DLL failed to LOCK mmc0: tuning execution failed: -110 Signed-off-by: Venkat Gopalakrishnan Signed-off-by: Ritesh Harjani Acked-by: Adrian Hunter --- drivers/mmc/host/sdhci-msm.c | 48 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c index 42f42aa..32b0b79 100644 --- a/drivers/mmc/host/sdhci-msm.c +++ b/drivers/mmc/host/sdhci-msm.c @@ -58,11 +58,17 @@ #define CORE_DLL_CONFIG 0x100 #define CORE_DLL_STATUS 0x108 +#define CORE_DLL_CONFIG_2 0x1b4 +#define CORE_FLL_CYCLE_CNT BIT(18) +#define CORE_DLL_CLOCK_DISABLE BIT(21) + #define CORE_VENDOR_SPEC 0x10c #define CORE_CLK_PWRSAVE BIT(1) #define CORE_VENDOR_SPEC_CAPABILITIES0 0x11c +#define TCXO_FREQ 19200000 + #define CDR_SELEXT_SHIFT 20 #define CDR_SELEXT_MASK (0xf << CDR_SELEXT_SHIFT) #define CMUX_SHIFT_PHASE_SHIFT 24 @@ -76,6 +82,7 @@ struct sdhci_msm_host { struct clk *pclk; /* SDHC peripheral bus clock */ struct clk *bus_clk; /* SDHC bus voter clock */ struct mmc_host *mmc; + bool use_14lpp_dll_reset; }; /* Platform specific tuning */ @@ -304,6 +311,8 @@ static inline void msm_cm_dll_set_freq(struct sdhci_host *host) static int msm_init_cm_dll(struct sdhci_host *host) { struct mmc_host *mmc = host->mmc; + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host); int wait_cnt = 50; unsigned long flags; u32 config = 0; @@ -319,6 +328,16 @@ static int msm_init_cm_dll(struct sdhci_host *host) config &= ~CORE_CLK_PWRSAVE; writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC); + if (msm_host->use_14lpp_dll_reset) { + config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG); + config &= ~CORE_CK_OUT_EN; + writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG); + + config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2); + config |= CORE_DLL_CLOCK_DISABLE; + writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG_2); + } + /* Write 1 to DLL_RST bit of DLL_CONFIG register */ config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG); config |= CORE_DLL_RST; @@ -330,6 +349,24 @@ static int msm_init_cm_dll(struct sdhci_host *host) writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG); msm_cm_dll_set_freq(host); + if (msm_host->use_14lpp_dll_reset) { + u32 mclk_freq = 0; + + if ((readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2) + & CORE_FLL_CYCLE_CNT)) + mclk_freq = (u32)((host->clock / TCXO_FREQ) * 8); + else + mclk_freq = (u32)((host->clock / TCXO_FREQ) * 4); + + config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2); + config &= ~(0xFF << 10); + config |= mclk_freq << 10; + + writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG_2); + /* wait for 5us before enabling DLL clock */ + udelay(5); + } + /* Write 0 to DLL_RST bit of DLL_CONFIG register */ config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG); config &= ~CORE_DLL_RST; @@ -340,6 +377,14 @@ static int msm_init_cm_dll(struct sdhci_host *host) config &= ~CORE_DLL_PDN; writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG); + if (msm_host->use_14lpp_dll_reset) { + msm_cm_dll_set_freq(host); + /* Enable the DLL clock */ + config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2); + config &= ~CORE_DLL_CLOCK_DISABLE; + writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG_2); + } + /* Set DLL_EN bit to 1. */ config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG); config |= CORE_DLL_EN; @@ -641,6 +686,9 @@ static int sdhci_msm_probe(struct platform_device *pdev) dev_dbg(&pdev->dev, "MCI Version: 0x%08x, major: 0x%04x, minor: 0x%02x\n", core_version, core_major, core_minor); + if ((core_major == 1) && (core_minor >= 0x42)) + msm_host->use_14lpp_dll_reset = true; + /* * Support for some capabilities is not advertised by newer * controller versions and must be explicitly enabled.