Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751548AbcL1LHp (ORCPT ); Wed, 28 Dec 2016 06:07:45 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:38696 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751524AbcL1LHm (ORCPT ); Wed, 28 Dec 2016 06:07:42 -0500 DMARC-Filter: OpenDMARC Filter v1.3.1 smtp.codeaurora.org 3D991613AB 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, adrian.hunter@intel.com Cc: linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, shawn.lin@rock-chips.com, stummala@codeaurora.org, georgi.djakov@linaro.org, linux-arm-msm@vger.kernel.org, pramod.gurav@linaro.org, jeremymc@redhat.com, venkatg@codeaurora.org, asutoshd@codeaurora.org, subhashj@codeaurora.org, Ritesh Harjani Subject: [PATCH 7/8] mmc: sdhci-msm: Make HS400 tuning follow as per recommeneded HW sequence Date: Wed, 28 Dec 2016 16:36:30 +0530 Message-Id: <1482923191-17362-8-git-send-email-riteshh@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1482923191-17362-1-git-send-email-riteshh@codeaurora.org> References: <1482923191-17362-1-git-send-email-riteshh@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1867 Lines: 54 During tuning execution for HS400 mode, HW sequence recommends to select MCLK_SEL/2(0x3) in VENDOR_SPEC & sdhc msm clock at GCC to be 400MHZ (nearest supported clk). Add this change in tuning sequence during HS400 tuning. Signed-off-by: Ritesh Harjani --- drivers/mmc/host/sdhci-msm.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c index 84d29dd..fa9bce3 100644 --- a/drivers/mmc/host/sdhci-msm.c +++ b/drivers/mmc/host/sdhci-msm.c @@ -151,7 +151,8 @@ static unsigned int msm_get_clock_rate_for_bus_mode(struct sdhci_host *host, */ if (ios.timing == MMC_TIMING_UHS_DDR50 || ios.timing == MMC_TIMING_MMC_DDR52 || - ios.timing == MMC_TIMING_MMC_HS400) + ios.timing == MMC_TIMING_MMC_HS400 || + host->flags & SDHCI_HS400_TUNING) clock *= 2; return clock; } @@ -611,7 +612,8 @@ void sdhci_msm_hc_select_mode(struct sdhci_host *host) { struct mmc_ios ios = host->mmc->ios; - if (ios.timing == MMC_TIMING_MMC_HS400) + if (ios.timing == MMC_TIMING_MMC_HS400 || + host->flags & SDHCI_HS400_TUNING) msm_hc_select_hs400(host); else msm_hc_select_default(host); @@ -831,6 +833,16 @@ static int sdhci_msm_execute_tuning(struct sdhci_host *host, u32 opcode) ios.timing == MMC_TIMING_UHS_SDR104)) return 0; + /* + * For HS400 tuning in HS200 timing requires: + * - select MCLK/2 in VENDOR_SPEC + * - program MCLK to 400MHz (or nearest supported) in GCC + */ + if (host->flags & SDHCI_HS400_TUNING) { + sdhci_msm_hc_select_mode(host); + msm_set_clock_rate_for_bus_mode(host, ios.clock); + } + retry: /* First of all reset the tuning block */ rc = msm_init_cm_dll(host); -- The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.