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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CA934C4167B for ; Fri, 1 Dec 2023 05:44:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1377540AbjLAFoU (ORCPT ); Fri, 1 Dec 2023 00:44:20 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42194 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1377368AbjLAFoS (ORCPT ); Fri, 1 Dec 2023 00:44:18 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 27EA7171A for ; Thu, 30 Nov 2023 21:44:24 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2EF80C433C9; Fri, 1 Dec 2023 05:44:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1701409463; bh=OwzaFwSrB9R9fz/n559M5Y5GjbwxckR18pqsJDu+mMM=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=VEDiyVV+bVWftBCoWFDjDRwtPnS2Fa/fWX6cNF0wy/0aTBwMXaC5UteWanowyhSVo GRAMbBHPwtrGHAsylU8UfSDX8PFwuU2/nXx+MnwRLMlJYq1VF1ycRylzkH2PjNHoLJ UevYMc2IX95mKh0ZJTCG6TF5Wtw7571XmygnzbqEithjdJNhwSoWk7QMGFJBItGDfp mhSZLSNxB+OTYSzfqoYOTvXscPmdWQ45UmAMngOOTHYM5H/0eMfSA61qi74gPiZj+2 367fPwQZlAwEXdLwjaHXuq5BlFI3JihVOLNa2VM1GMbQd1zJzQ33VTpGrEHN/X1hj7 B1+YInbkcgh1A== Date: Fri, 1 Dec 2023 11:14:08 +0530 From: Manivannan Sadhasivam To: Can Guo Cc: bvanassche@acm.org, adrian.hunter@intel.com, vkoul@kernel.org, beanhuo@micron.com, avri.altman@wdc.com, junwoo80.lee@samsung.com, martin.petersen@oracle.com, linux-scsi@vger.kernel.org, linux-arm-msm@vger.kernel.org, "Bao D. Nguyen" , Andy Gross , Bjorn Andersson , Konrad Dybcio , "James E.J. Bottomley" , open list Subject: Re: [PATCH v7 08/10] scsi: ufs: ufs-qcom: Add support for UFS device version detection Message-ID: <20231201054408.GC4009@thinkpad> References: <1701407001-471-1-git-send-email-quic_cang@quicinc.com> <1701407001-471-9-git-send-email-quic_cang@quicinc.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1701407001-471-9-git-send-email-quic_cang@quicinc.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Nov 30, 2023 at 09:03:18PM -0800, Can Guo wrote: > From: "Bao D. Nguyen" > > A spare register in UFS host controller is used to indicate the UFS device > version. The spare register is populated by bootloader for now, but in > future it will be populated by HW automatically during link startup with > its best efforts in any boot stages prior to Linux. > > During host driver init, read the spare register, if it is not populated > with a UFS device version, go ahead with the dual init mechanism. If a UFS > device version is in there, use the UFS device version together with host > controller's HW version to decide the proper PHY gear which should be used > to configure the UFS PHY without going through the second init. > > Signed-off-by: Bao D. Nguyen > Signed-off-by: Can Guo Reviewed-by: Manivannan Sadhasivam - Mani > --- > drivers/ufs/host/ufs-qcom.c | 35 ++++++++++++++++++++++++++++------- > drivers/ufs/host/ufs-qcom.h | 4 ++++ > 2 files changed, 32 insertions(+), 7 deletions(-) > > diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c > index ee3f07a..99a0a53 100644 > --- a/drivers/ufs/host/ufs-qcom.c > +++ b/drivers/ufs/host/ufs-qcom.c > @@ -1065,17 +1065,38 @@ static void ufs_qcom_advertise_quirks(struct ufs_hba *hba) > static void ufs_qcom_set_phy_gear(struct ufs_qcom_host *host) > { > struct ufs_host_params *host_params = &host->host_params; > + u32 val, dev_major; > > host->phy_gear = host_params->hs_tx_gear; > > - /* > - * For controllers whose major HW version is < 4, power up the PHY using > - * minimum supported gear (UFS_HS_G2). Switching to max gear will be > - * performed during reinit if supported. For newer controllers, whose > - * major HW version is >= 4, power up the PHY using max supported gear. > - */ > - if (host->hw_ver.major < 0x4) > + if (host->hw_ver.major < 0x4) { > + /* > + * For controllers whose major HW version is < 4, power up the > + * PHY using minimum supported gear (UFS_HS_G2). Switching to > + * max gear will be performed during reinit if supported. > + * For newer controllers, whose major HW version is >= 4, power > + * up the PHY using max supported gear. > + */ > host->phy_gear = UFS_HS_G2; > + } else { > + val = ufshcd_readl(host->hba, REG_UFS_DEBUG_SPARE_CFG); > + dev_major = FIELD_GET(UFS_DEV_VER_MAJOR_MASK, val); > + > + /* > + * Since the UFS device version is populated, let's remove the > + * REINIT quirk as the negotiated gear won't change during boot. > + * So there is no need to do reinit. > + */ > + if (dev_major != 0x0) > + host->hba->quirks &= ~UFSHCD_QUIRK_REINIT_AFTER_MAX_GEAR_SWITCH; > + > + /* > + * For UFS 3.1 device and older, power up the PHY using HS-G4 > + * PHY gear to save power. > + */ > + if (dev_major > 0x0 && dev_major < 0x4) > + host->phy_gear = UFS_HS_G4; > + } > } > > static void ufs_qcom_set_host_params(struct ufs_hba *hba) > diff --git a/drivers/ufs/host/ufs-qcom.h b/drivers/ufs/host/ufs-qcom.h > index 11419eb..32e51d9 100644 > --- a/drivers/ufs/host/ufs-qcom.h > +++ b/drivers/ufs/host/ufs-qcom.h > @@ -23,6 +23,8 @@ > #define UFS_HW_VER_MINOR_MASK GENMASK(27, 16) > #define UFS_HW_VER_STEP_MASK GENMASK(15, 0) > > +#define UFS_DEV_VER_MAJOR_MASK GENMASK(7, 4) > + > /* vendor specific pre-defined parameters */ > #define SLOW 1 > #define FAST 2 > @@ -54,6 +56,8 @@ enum { > UFS_AH8_CFG = 0xFC, > > REG_UFS_CFG3 = 0x271C, > + > + REG_UFS_DEBUG_SPARE_CFG = 0x284C, > }; > > /* QCOM UFS host controller vendor specific debug registers */ > -- > 2.7.4 > -- மணிவண்ணன் சதாசிவம்