From patchwork Tue Mar 8 12:35:55 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yaniv Gardi X-Patchwork-Id: 8533101 Return-Path: X-Original-To: patchwork-linux-arm-msm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 9078C9F2B4 for ; Tue, 8 Mar 2016 12:36:55 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 79A842017E for ; Tue, 8 Mar 2016 12:36:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5113C20142 for ; Tue, 8 Mar 2016 12:36:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751502AbcCHMgv (ORCPT ); Tue, 8 Mar 2016 07:36:51 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:48549 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751182AbcCHMgu (ORCPT ); Tue, 8 Mar 2016 07:36:50 -0500 Received: from smtp.codeaurora.org (localhost [127.0.0.1]) by smtp.codeaurora.org (Postfix) with ESMTP id B164260CF7; Tue, 8 Mar 2016 12:36:49 +0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1000) id A44F560CF2; Tue, 8 Mar 2016 12:36:49 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from lx-ygardi.mea.qualcomm.com (unknown [185.23.60.4]) (using TLSv1.1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: ygardi@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 6AE416038D; Tue, 8 Mar 2016 12:36:46 +0000 (UTC) From: Yaniv Gardi To: James.Bottomley@HansenPartnership.com Cc: linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, linux-arm-msm@vger.kernel.org, santoshsy@gmail.com, linux-scsi-owner@vger.kernel.org, ygardi@codeaurora.org, Raviv Shvili , Vinayak Holikatti , "James E.J. Bottomley" , "Martin K. Petersen" Subject: [PATCH v7 04/17] scsi: ufs: verify hba controller hce reg value Date: Tue, 8 Mar 2016 14:35:55 +0200 Message-Id: <1457440568-13084-5-git-send-email-ygardi@codeaurora.org> X-Mailer: git-send-email 1.8.5.2 In-Reply-To: <1457440568-13084-1-git-send-email-ygardi@codeaurora.org> References: <1457440568-13084-1-git-send-email-ygardi@codeaurora.org> X-Virus-Scanned: ClamAV using ClamSMTP Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Sometimes due to hw issues it takes some time to the host controller register to update. In order to verify the register has updated, a polling is done until its value is set. In addition the functions ufshcd_hba_stop() and ufshcd_wait_for_register() was updated with an additional input parameter, indicating the timeout between reads will be done by sleeping or spinning the cpu. Reviewed-by: Hannes Reinecke Signed-off-by: Raviv Shvili Signed-off-by: Yaniv Gardi --- drivers/scsi/ufs/ufshcd.c | 53 ++++++++++++++++++++++++++++------------------- drivers/scsi/ufs/ufshcd.h | 12 +++-------- 2 files changed, 35 insertions(+), 30 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 3400ceb..80031e6 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -240,11 +240,13 @@ static inline void ufshcd_disable_irq(struct ufs_hba *hba) * @val - wait condition * @interval_us - polling interval in microsecs * @timeout_ms - timeout in millisecs + * @can_sleep - perform sleep or just spin * * Returns -ETIMEDOUT on error, zero on success */ -static int ufshcd_wait_for_register(struct ufs_hba *hba, u32 reg, u32 mask, - u32 val, unsigned long interval_us, unsigned long timeout_ms) +int ufshcd_wait_for_register(struct ufs_hba *hba, u32 reg, u32 mask, + u32 val, unsigned long interval_us, + unsigned long timeout_ms, bool can_sleep) { int err = 0; unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms); @@ -253,9 +255,10 @@ static int ufshcd_wait_for_register(struct ufs_hba *hba, u32 reg, u32 mask, val = val & mask; while ((ufshcd_readl(hba, reg) & mask) != val) { - /* wakeup within 50us of expiry */ - usleep_range(interval_us, interval_us + 50); - + if (can_sleep) + usleep_range(interval_us, interval_us + 50); + else + udelay(interval_us); if (time_after(jiffies, timeout)) { if ((ufshcd_readl(hba, reg) & mask) != val) err = -ETIMEDOUT; @@ -1459,7 +1462,7 @@ ufshcd_clear_cmd(struct ufs_hba *hba, int tag) */ err = ufshcd_wait_for_register(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL, - mask, ~mask, 1000, 1000); + mask, ~mask, 1000, 1000, true); return err; } @@ -2815,6 +2818,23 @@ out: } /** + * ufshcd_hba_stop - Send controller to reset state + * @hba: per adapter instance + * @can_sleep: perform sleep or just spin + */ +static inline void ufshcd_hba_stop(struct ufs_hba *hba, bool can_sleep) +{ + int err; + + ufshcd_writel(hba, CONTROLLER_DISABLE, REG_CONTROLLER_ENABLE); + err = ufshcd_wait_for_register(hba, REG_CONTROLLER_ENABLE, + CONTROLLER_ENABLE, CONTROLLER_DISABLE, + 10, 1, can_sleep); + if (err) + dev_err(hba->dev, "%s: Controller disable failed\n", __func__); +} + +/** * ufshcd_hba_enable - initialize the controller * @hba: per adapter instance * @@ -2834,18 +2854,9 @@ static int ufshcd_hba_enable(struct ufs_hba *hba) * development and testing of this driver. msleep can be changed to * mdelay and retry count can be reduced based on the controller. */ - if (!ufshcd_is_hba_active(hba)) { - + if (!ufshcd_is_hba_active(hba)) /* change controller state to "reset state" */ - ufshcd_hba_stop(hba); - - /* - * This delay is based on the testing done with UFS host - * controller FPGA. The delay can be changed based on the - * host controller used. - */ - msleep(5); - } + ufshcd_hba_stop(hba, true); /* UniPro link is disabled at this point */ ufshcd_set_link_off(hba); @@ -3898,7 +3909,7 @@ static int ufshcd_clear_tm_cmd(struct ufs_hba *hba, int tag) /* poll for max. 1 sec to clear door bell register by h/w */ err = ufshcd_wait_for_register(hba, REG_UTP_TASK_REQ_DOOR_BELL, - mask, 0, 1000, 1000); + mask, 0, 1000, 1000, true); out: return err; } @@ -4180,7 +4191,7 @@ static int ufshcd_host_reset_and_restore(struct ufs_hba *hba) /* Reset the host controller */ spin_lock_irqsave(hba->host->host_lock, flags); - ufshcd_hba_stop(hba); + ufshcd_hba_stop(hba, false); spin_unlock_irqrestore(hba->host->host_lock, flags); err = ufshcd_hba_enable(hba); @@ -5133,7 +5144,7 @@ static int ufshcd_link_state_transition(struct ufs_hba *hba, * Change controller state to "reset state" which * should also put the link in off/reset state */ - ufshcd_hba_stop(hba); + ufshcd_hba_stop(hba, true); /* * TODO: Check if we need any delay to make sure that * controller is reset @@ -5609,7 +5620,7 @@ void ufshcd_remove(struct ufs_hba *hba) scsi_remove_host(hba->host); /* disable interrupts */ ufshcd_disable_intr(hba, hba->intr_mask); - ufshcd_hba_stop(hba); + ufshcd_hba_stop(hba, true); scsi_host_put(hba->host); diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index 9ae7f85..a6d3572 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -590,15 +590,9 @@ int ufshcd_alloc_host(struct device *, struct ufs_hba **); void ufshcd_dealloc_host(struct ufs_hba *); int ufshcd_init(struct ufs_hba * , void __iomem * , unsigned int); void ufshcd_remove(struct ufs_hba *); - -/** - * ufshcd_hba_stop - Send controller to reset state - * @hba: per adapter instance - */ -static inline void ufshcd_hba_stop(struct ufs_hba *hba) -{ - ufshcd_writel(hba, CONTROLLER_DISABLE, REG_CONTROLLER_ENABLE); -} +int ufshcd_wait_for_register(struct ufs_hba *hba, u32 reg, u32 mask, + u32 val, unsigned long interval_us, + unsigned long timeout_ms, bool can_sleep); static inline void check_upiu_size(void) {