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[23.128.96.18]) by mx.google.com with ESMTP id t20si12182989edw.31.2020.12.22.05.51.14; Tue, 22 Dec 2020 05:51:37 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727199AbgLVNvC (ORCPT + 99 others); Tue, 22 Dec 2020 08:51:02 -0500 Received: from alexa-out-tai-01.qualcomm.com ([103.229.16.226]:58757 "EHLO alexa-out-tai-01.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726904AbgLVNvB (ORCPT ); Tue, 22 Dec 2020 08:51:01 -0500 Received: from ironmsg03-tai.qualcomm.com ([10.249.140.8]) by alexa-out-tai-01.qualcomm.com with ESMTP; 22 Dec 2020 21:50:16 +0800 X-QCInternal: smtphost Received: from cbsp-sh-gv.ap.qualcomm.com (HELO cbsp-sh-gv.qualcomm.com) ([10.231.249.68]) by ironmsg03-tai.qualcomm.com with ESMTP; 22 Dec 2020 21:49:44 +0800 Received: by cbsp-sh-gv.qualcomm.com (Postfix, from userid 393357) id 85939276B; Tue, 22 Dec 2020 21:49:43 +0800 (CST) From: Ziqi Chen To: asutoshd@codeaurora.org, nguyenb@codeaurora.org, cang@codeaurora.org, hongwus@codeaurora.org, rnayak@codeaurora.org, vinholikatti@gmail.com, jejb@linux.vnet.ibm.com, martin.petersen@oracle.com, linux-scsi@vger.kernel.org, kernel-team@android.com, saravanak@google.com, salyzyn@google.com, ziqichen@codeaurora.org, kwmad.kim@samsung.com, stanley.chu@mediatek.com Cc: Alim Akhtar , Avri Altman , "James E.J. Bottomley" , Andy Gross , Bjorn Andersson , Matthias Brugger , Bean Huo , Bart Van Assche , Adrian Hunter , Satya Tangirala , linux-mediatek@lists.infradead.org (moderated list:UNIVERSAL FLASH STORAGE HOST CONTROLLER DRIVER...), linux-kernel@vger.kernel.org (open list), linux-arm-msm@vger.kernel.org (open list:ARM/QUALCOMM SUPPORT), linux-arm-kernel@lists.infradead.org (moderated list:ARM/Mediatek SoC support) Subject: [PATCH RFC v4 1/1] scsi: ufs: Fix ufs power down/on specs violation Date: Tue, 22 Dec 2020 21:49:33 +0800 Message-Id: <1608644981-46267-1-git-send-email-ziqichen@codeaurora.org> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org As per specs, e.g, JESD220E chapter 7.2, while powering off/on the ufs device, RST_N signal and REF_CLK signal should be between VSS(Ground) and VCCQ/VCCQ2. To flexibly control device reset line, refactor the function ufschd_vops_device_reset(sturct ufs_hba *hba) to ufshcd_ vops_device_reset(sturct ufs_hba *hba, bool asserted). The new parameter "bool asserted" is used to separate device reset line pulling down from pulling up. Cc: Kiwoong Kim Cc: Stanley Chu Signed-off-by: Ziqi Chen --- drivers/scsi/ufs/ufs-mediatek.c | 32 ++++++++++++++++---------------- drivers/scsi/ufs/ufs-qcom.c | 24 +++++++++++++++--------- drivers/scsi/ufs/ufshcd.c | 36 +++++++++++++++++++++++++----------- drivers/scsi/ufs/ufshcd.h | 8 ++++---- 4 files changed, 60 insertions(+), 40 deletions(-) diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c index 80618af..072f4db 100644 --- a/drivers/scsi/ufs/ufs-mediatek.c +++ b/drivers/scsi/ufs/ufs-mediatek.c @@ -841,27 +841,27 @@ static int ufs_mtk_link_startup_notify(struct ufs_hba *hba, return ret; } -static int ufs_mtk_device_reset(struct ufs_hba *hba) +static int ufs_mtk_device_reset(struct ufs_hba *hba, bool asserted) { struct arm_smccc_res res; - ufs_mtk_device_reset_ctrl(0, res); + if (asserted) { + ufs_mtk_device_reset_ctrl(0, res); - /* - * The reset signal is active low. UFS devices shall detect - * more than or equal to 1us of positive or negative RST_n - * pulse width. - * - * To be on safe side, keep the reset low for at least 10us. - */ - usleep_range(10, 15); - - ufs_mtk_device_reset_ctrl(1, res); - - /* Some devices may need time to respond to rst_n */ - usleep_range(10000, 15000); + /* + * The reset signal is active low. UFS devices shall detect + * more than or equal to 1us of positive or negative RST_n + * pulse width. + * + * To be on safe side, keep the reset low for at least 10us. + */ + usleep_range(10, 15); + } else { + ufs_mtk_device_reset_ctrl(1, res); - dev_info(hba->dev, "device reset done\n"); + /* Some devices may need time to respond to rst_n */ + usleep_range(10000, 15000); + } return 0; } diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c index 2206b1e..fed10e5 100644 --- a/drivers/scsi/ufs/ufs-qcom.c +++ b/drivers/scsi/ufs/ufs-qcom.c @@ -1406,10 +1406,11 @@ static void ufs_qcom_dump_dbg_regs(struct ufs_hba *hba) /** * ufs_qcom_device_reset() - toggle the (optional) device reset line * @hba: per-adapter instance + * @asserted: assert or deassert device reset line * * Toggles the (optional) reset line to reset the attached device. */ -static int ufs_qcom_device_reset(struct ufs_hba *hba) +static int ufs_qcom_device_reset(struct ufs_hba *hba, bool asserted) { struct ufs_qcom_host *host = ufshcd_get_variant(hba); @@ -1417,15 +1418,20 @@ static int ufs_qcom_device_reset(struct ufs_hba *hba) if (!host->device_reset) return -EOPNOTSUPP; - /* - * The UFS device shall detect reset pulses of 1us, sleep for 10us to - * be on the safe side. - */ - gpiod_set_value_cansleep(host->device_reset, 1); - usleep_range(10, 15); + if (asserted) { + gpiod_set_value_cansleep(host->device_reset, 1); - gpiod_set_value_cansleep(host->device_reset, 0); - usleep_range(10, 15); + /* + * The UFS device shall detect reset pulses of 1us, sleep for 10us to + * be on the safe side. + */ + usleep_range(10, 15); + } else { + gpiod_set_value_cansleep(host->device_reset, 0); + + /* Some devices may need time to respond to rst_n */ + usleep_range(10, 15); + } return 0; } diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index e221add..f2daac2 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -585,7 +585,13 @@ static void ufshcd_device_reset(struct ufs_hba *hba) { int err; - err = ufshcd_vops_device_reset(hba); + err = ufshcd_vops_device_reset(hba, true); + if (err) { + dev_err(hba->dev, "asserting device reset failed: %d\n", err); + return; + } + + err = ufshcd_vops_device_reset(hba, false); if (!err) { ufshcd_set_ufs_dev_active(hba); @@ -593,7 +599,11 @@ static void ufshcd_device_reset(struct ufs_hba *hba) hba->wb_enabled = false; hba->wb_buf_flush_enabled = false; } + dev_dbg(hba->dev, "device reset done\n"); + } else { + dev_err(hba->dev, "deasserting device reset failed: %d\n", err); } + if (err != -EOPNOTSUPP) ufshcd_update_evt_hist(hba, UFS_EVT_DEV_RESET, err); } @@ -8686,8 +8696,6 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) if (ret) goto set_dev_active; - ufshcd_vreg_set_lpm(hba); - disable_clks: /* * Call vendor specific suspend callback. As these callbacks may access @@ -8703,6 +8711,9 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) */ ufshcd_disable_irq(hba); + if (ufshcd_is_link_off(hba)) + ufshcd_vops_device_reset(hba, true); + ufshcd_setup_clocks(hba, false); if (ufshcd_is_clkgating_allowed(hba)) { @@ -8711,6 +8722,8 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) hba->clk_gating.state); } + ufshcd_vreg_set_lpm(hba); + /* Put the host controller in low power mode if possible */ ufshcd_hba_vreg_set_lpm(hba); goto out; @@ -8778,18 +8791,19 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) old_link_state = hba->uic_link_state; ufshcd_hba_vreg_set_hpm(hba); + + ret = ufshcd_vreg_set_hpm(hba); + if (ret) + goto out; + /* Make sure clocks are enabled before accessing controller */ ret = ufshcd_setup_clocks(hba, true); if (ret) - goto out; + goto disable_vreg; /* enable the host irq as host controller would be active soon */ ufshcd_enable_irq(hba); - ret = ufshcd_vreg_set_hpm(hba); - if (ret) - goto disable_irq_and_vops_clks; - /* * Call vendor specific resume callback. As these callbacks may access * vendor specific host controller register space call them when the @@ -8797,7 +8811,7 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) */ ret = ufshcd_vops_resume(hba, pm_op); if (ret) - goto disable_vreg; + goto disable_irq_and_vops_clks; /* For DeepSleep, the only supported option is to have the link off */ WARN_ON(ufshcd_is_ufs_dev_deepsleep(hba) && !ufshcd_is_link_off(hba)); @@ -8864,8 +8878,6 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) ufshcd_link_state_transition(hba, old_link_state, 0); vendor_suspend: ufshcd_vops_suspend(hba, pm_op); -disable_vreg: - ufshcd_vreg_set_lpm(hba); disable_irq_and_vops_clks: ufshcd_disable_irq(hba); if (hba->clk_scaling.is_allowed) @@ -8876,6 +8888,8 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) trace_ufshcd_clk_gating(dev_name(hba->dev), hba->clk_gating.state); } +disable_vreg: + ufshcd_vreg_set_lpm(hba); out: hba->pm_op_in_progress = 0; if (ret) diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index 9bb5f0e..d5fbaba 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -319,7 +319,7 @@ struct ufs_pwr_mode_info { * @resume: called during host controller PM callback * @dbg_register_dump: used to dump controller debug information * @phy_initialization: used to initialize phys - * @device_reset: called to issue a reset pulse on the UFS device + * @device_reset: called to assert or deassert device reset line * @program_key: program or evict an inline encryption key * @event_notify: called to notify important events */ @@ -350,7 +350,7 @@ struct ufs_hba_variant_ops { int (*resume)(struct ufs_hba *, enum ufs_pm_op); void (*dbg_register_dump)(struct ufs_hba *hba); int (*phy_initialization)(struct ufs_hba *); - int (*device_reset)(struct ufs_hba *hba); + int (*device_reset)(struct ufs_hba *hba, bool asserted); void (*config_scaling_param)(struct ufs_hba *hba, struct devfreq_dev_profile *profile, void *data); @@ -1216,10 +1216,10 @@ static inline void ufshcd_vops_dbg_register_dump(struct ufs_hba *hba) hba->vops->dbg_register_dump(hba); } -static inline int ufshcd_vops_device_reset(struct ufs_hba *hba) +static inline int ufshcd_vops_device_reset(struct ufs_hba *hba, bool asserted) { if (hba->vops && hba->vops->device_reset) - return hba->vops->device_reset(hba); + return hba->vops->device_reset(hba, asserted); return -EOPNOTSUPP; } -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project