From patchwork Fri Dec 13 15:21:12 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Zhou Yanjie X-Patchwork-Id: 11290667 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 2B207109A for ; Fri, 13 Dec 2019 20:37:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DDD9E24763 for ; Fri, 13 Dec 2019 20:37:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726528AbfLMPVj (ORCPT ); Fri, 13 Dec 2019 10:21:39 -0500 Received: from out28-52.mail.aliyun.com ([115.124.28.52]:42509 "EHLO out28-52.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727872AbfLMPVi (ORCPT ); Fri, 13 Dec 2019 10:21:38 -0500 X-Alimail-AntiSpam: AC=CONTINUE;BC=0.07670759|-1;CH=green;DM=CONTINUE|CONTINUE|true|0.826969-0.0200583-0.152973;DS=CONTINUE|ham_system_inform|0.423128-0.00153908-0.575333;FP=12401601434723292222|1|1|1|0|-1|-1|-1;HT=e02c03306;MF=zhouyanjie@wanyeetech.com;NM=1;PH=DS;RN=13;RT=13;SR=0;TI=SMTPD_---.GGSxanS_1576250475; Received: from zhouyanjie-virtual-machine.localdomain(mailfrom:zhouyanjie@wanyeetech.com fp:SMTPD_---.GGSxanS_1576250475) by smtp.aliyun-inc.com(10.147.40.233); Fri, 13 Dec 2019 23:21:29 +0800 From: =?utf-8?b?5ZGo55Cw5p2wIChaaG91IFlhbmppZSk=?= To: linux-mips@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org, devicetree@vger.kernel.org, robh+dt@kernel.org, paul.burton@mips.com, paulburton@kernel.org, paul@crapouillou.net, mturquette@baylibre.com, sboyd@kernel.org, mark.rutland@arm.com, sernia.zhou@foxmail.com, zhenwenjin@gmail.com Subject: [PATCH v2 5/5] clk: Ingenic: Remove unnecessary spinlock when reading registers. Date: Fri, 13 Dec 2019 23:21:12 +0800 Message-Id: <1576250472-124315-7-git-send-email-zhouyanjie@wanyeetech.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1576250472-124315-1-git-send-email-zhouyanjie@wanyeetech.com> References: <1576250472-124315-1-git-send-email-zhouyanjie@wanyeetech.com> MIME-Version: 1.0 Sender: linux-clk-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org It is not necessary to use spinlock when reading registers, so remove it from cgu.c. Suggested-by: Paul Cercueil Suggested-by: Paul Burton Signed-off-by: 周琰杰 (Zhou Yanjie) --- Notes: v2: New Patch. drivers/clk/ingenic/cgu.c | 8 -------- 1 file changed, 8 deletions(-) diff --git a/drivers/clk/ingenic/cgu.c b/drivers/clk/ingenic/cgu.c index ae1ddcb..3c95451 100644 --- a/drivers/clk/ingenic/cgu.c +++ b/drivers/clk/ingenic/cgu.c @@ -76,16 +76,13 @@ ingenic_pll_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) const struct ingenic_cgu_pll_info *pll_info; unsigned m, n, od_enc, od; bool bypass; - unsigned long flags; u32 ctl; clk_info = &cgu->clock_info[ingenic_clk->idx]; BUG_ON(clk_info->type != CGU_CLK_PLL); pll_info = &clk_info->pll; - spin_lock_irqsave(&cgu->lock, flags); ctl = readl(cgu->base + pll_info->pll_reg); - spin_unlock_irqrestore(&cgu->lock, flags); m = (ctl >> pll_info->m_shift) & GENMASK(pll_info->m_bits - 1, 0); m += pll_info->m_offset; @@ -94,9 +91,7 @@ ingenic_pll_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) od_enc = ctl >> pll_info->od_shift; od_enc &= GENMASK(pll_info->od_bits - 1, 0); - spin_lock_irqsave(&cgu->lock, flags); ctl = readl(cgu->base + pll_info->bypass_reg); - spin_unlock_irqrestore(&cgu->lock, flags); bypass = !pll_info->no_bypass_bit && !!(ctl & BIT(pll_info->bypass_bit)); @@ -269,12 +264,9 @@ static int ingenic_pll_is_enabled(struct clk_hw *hw) struct ingenic_cgu *cgu = ingenic_clk->cgu; const struct ingenic_cgu_clk_info *clk_info = to_clk_info(ingenic_clk); const struct ingenic_cgu_pll_info *pll_info = &clk_info->pll; - unsigned long flags; u32 ctl; - spin_lock_irqsave(&cgu->lock, flags); ctl = readl(cgu->base + pll_info->pll_reg); - spin_unlock_irqrestore(&cgu->lock, flags); return !!(ctl & BIT(pll_info->enable_bit)); }