linux-mips.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: "周琰杰 (Zhou Yanjie)" <zhouyanjie@wanyeetech.com>
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 v3 1/5] clk: Ingenic: Remove unnecessary spinlock when reading registers.
Date: Sat, 14 Dec 2019 23:33:46 +0800	[thread overview]
Message-ID: <1576337630-78576-3-git-send-email-zhouyanjie@wanyeetech.com> (raw)
In-Reply-To: <1576337630-78576-1-git-send-email-zhouyanjie@wanyeetech.com>

It is not necessary to use spinlock when reading registers,
so remove it from cgu.c.

Suggested-by: Paul Cercueil <paul@crapouillou.net>
Suggested-by: Paul Burton <paulburton@kernel.org>
Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
---

Notes:
    v2:
    New patch.
    
    v2->v3:
    Adjust order from [5/5] in v2 to [1/5] in v3.

 drivers/clk/ingenic/cgu.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/clk/ingenic/cgu.c b/drivers/clk/ingenic/cgu.c
index 6e96303..8bd3998 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->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;
@@ -259,12 +256,9 @@ 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->reg);
-	spin_unlock_irqrestore(&cgu->lock, flags);
 
 	return !!(ctl & BIT(pll_info->enable_bit));
 }
-- 
2.7.4


  parent reply	other threads:[~2019-12-14 15:34 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-14 15:33 Add support for the X1830 v3 周琰杰 (Zhou Yanjie)
2019-12-14 15:33 ` [PATCH v3 0/5] clk: Ingenic: " 周琰杰 (Zhou Yanjie)
2019-12-14 15:33 ` 周琰杰 (Zhou Yanjie) [this message]
2019-12-14 18:07   ` [PATCH v3 1/5] clk: Ingenic: Remove unnecessary spinlock when reading registers Paul Cercueil
2019-12-15 14:11     ` Zhou Yanjie
2019-12-14 15:33 ` [PATCH v3 2/5] clk: Ingenic: Adjust cgu code to make it compatible with X1830 周琰杰 (Zhou Yanjie)
2019-12-14 18:09   ` Paul Cercueil
2019-12-15 14:13     ` Zhou Yanjie
2019-12-14 15:33 ` [PATCH v3 3/5] clk: Ingenic: Adjust code to make it compatible with new cgu code 周琰杰 (Zhou Yanjie)
2019-12-14 15:33 ` [PATCH v3 4/5] dt-bindings: clock: Add X1830 bindings 周琰杰 (Zhou Yanjie)
2019-12-14 15:33 ` [PATCH v3 5/5] clk: Ingenic: Add CGU driver for X1830 周琰杰 (Zhou Yanjie)

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1576337630-78576-3-git-send-email-zhouyanjie@wanyeetech.com \
    --to=zhouyanjie@wanyeetech.com \
    --cc=devicetree@vger.kernel.org \
    --cc=linux-clk@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mips@vger.kernel.org \
    --cc=mark.rutland@arm.com \
    --cc=mturquette@baylibre.com \
    --cc=paul.burton@mips.com \
    --cc=paul@crapouillou.net \
    --cc=paulburton@kernel.org \
    --cc=robh+dt@kernel.org \
    --cc=sboyd@kernel.org \
    --cc=sernia.zhou@foxmail.com \
    --cc=zhenwenjin@gmail.com \
    --subject='Re: [PATCH v3 1/5] clk: Ingenic: Remove unnecessary spinlock when reading registers.' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).