From patchwork Fri Jul 31 08:08:01 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 11694367 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7174113B1 for ; Fri, 31 Jul 2020 08:08:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6327021883 for ; Fri, 31 Jul 2020 08:08:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731682AbgGaIIR (ORCPT ); Fri, 31 Jul 2020 04:08:17 -0400 Received: from labrats.qualcomm.com ([199.106.110.90]:63244 "EHLO labrats.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731510AbgGaIIR (ORCPT ); Fri, 31 Jul 2020 04:08:17 -0400 IronPort-SDR: 8mfUNt83D/ZrPU3usiZRi1UMAc+QmnD7H/VSTtQ3Z9PDLnQrWsfTJP+Ht7wS26A30SM7krFp4N AOwll1EQ5eSoPBI4UfsZTiXQ+LraT+qFdlRDl80k/aDdLICxAHfUL2xoxW3KdJ6S4yB8uXu66k E1i7Vhr5ycViylDrI3YbnbivGKml81kyKs+HDcWfvSTlGr7vg1Cge1WzvAjMqdVeqYHpmyspU4 136WdvzjMiHZA0VgQcZL3xAIgriXVH/Z/FvLHbflHOowuQa3ygvs8bWQVY0Ha+Y19uQwzyYRf8 Vs4= X-IronPort-AV: E=Sophos;i="5.75,417,1589266800"; d="scan'208";a="47235639" Received: from unknown (HELO ironmsg01-sd.qualcomm.com) ([10.53.140.141]) by labrats.qualcomm.com with ESMTP; 31 Jul 2020 01:08:17 -0700 Received: from pacamara-linux.qualcomm.com ([192.168.140.135]) by ironmsg01-sd.qualcomm.com with ESMTP; 31 Jul 2020 01:08:16 -0700 Received: by pacamara-linux.qualcomm.com (Postfix, from userid 359480) id 281A722E73; Fri, 31 Jul 2020 01:08:15 -0700 (PDT) From: Can Guo To: asutoshd@codeaurora.org, nguyenb@codeaurora.org, hongwus@codeaurora.org, rnayak@codeaurora.org, linux-scsi@vger.kernel.org, kernel-team@android.com, saravanak@google.com, salyzyn@google.com, cang@codeaurora.org Cc: Alim Akhtar , Avri Altman , "James E.J. Bottomley" , "Martin K. Petersen" , Matthias Brugger , Stanley Chu , Bean Huo , Bart Van Assche , linux-kernel@vger.kernel.org (open list), linux-arm-kernel@lists.infradead.org (moderated list:ARM/Mediatek SoC support), linux-mediatek@lists.infradead.org (moderated list:ARM/Mediatek SoC support) Subject: [PATCH 1/8] scsi: ufs: Add checks before setting clk-gating states Date: Fri, 31 Jul 2020 01:08:01 -0700 Message-Id: <1596182890-10086-2-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1596182890-10086-1-git-send-email-cang@codeaurora.org> References: <1596182890-10086-1-git-send-email-cang@codeaurora.org> Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Clock gating features can be turned on/off selectively which means its state information is only important if it is enabled. This change makes sure that we only look at state of clk-gating if it is enabled. Signed-off-by: Can Guo Reviewed-by: Avri Altman Reviewed-by: Hongwu Su Reviewed-by: Stanley Chu Reviewed-by: Bean Huo diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index cdff7e5..99bd3e4 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -1839,6 +1839,8 @@ static void ufshcd_init_clk_gating(struct ufs_hba *hba) if (!ufshcd_is_clkgating_allowed(hba)) return; + hba->clk_gating.state = CLKS_ON; + hba->clk_gating.delay_ms = 150; INIT_DELAYED_WORK(&hba->clk_gating.gate_work, ufshcd_gate_work); INIT_WORK(&hba->clk_gating.ungate_work, ufshcd_ungate_work); @@ -2541,7 +2543,8 @@ static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd) err = SCSI_MLQUEUE_HOST_BUSY; goto out; } - WARN_ON(hba->clk_gating.state != CLKS_ON); + WARN_ON(ufshcd_is_clkgating_allowed(hba) && + (hba->clk_gating.state != CLKS_ON)); lrbp = &hba->lrb[tag]; @@ -8315,8 +8318,11 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) /* If link is active, device ref_clk can't be switched off */ __ufshcd_setup_clocks(hba, false, true); - hba->clk_gating.state = CLKS_OFF; - trace_ufshcd_clk_gating(dev_name(hba->dev), hba->clk_gating.state); + if (ufshcd_is_clkgating_allowed(hba)) { + hba->clk_gating.state = CLKS_OFF; + trace_ufshcd_clk_gating(dev_name(hba->dev), + hba->clk_gating.state); + } /* Put the host controller in low power mode if possible */ ufshcd_hba_vreg_set_lpm(hba); @@ -8456,6 +8462,11 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) if (hba->clk_scaling.is_allowed) ufshcd_suspend_clkscaling(hba); ufshcd_setup_clocks(hba, false); + if (ufshcd_is_clkgating_allowed(hba)) { + hba->clk_gating.state = CLKS_OFF; + trace_ufshcd_clk_gating(dev_name(hba->dev), + hba->clk_gating.state); + } out: hba->pm_op_in_progress = 0; if (ret)