From: Zhou Yanjie <zhouyanjie@wanyeetech.com>
To: Paul Cercueil <paul@crapouillou.net>
Cc: linux-mips@vger.kernel.org, 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,
mturquette@baylibre.com, sboyd@kernel.org, mark.rutland@arm.com,
sernia.zhou@foxmail.com, zhenwenjin@gmail.com
Subject: Re: [PATCH v3 1/5] clk: Ingenic: Remove unnecessary spinlock when reading registers.
Date: Sun, 15 Dec 2019 22:11:58 +0800 [thread overview]
Message-ID: <5DF63F2E.2040608@wanyeetech.com> (raw)
In-Reply-To: <1576346863.3.1@crapouillou.net>
Hi Paul,
On 2019年12月15日 02:07, Paul Cercueil wrote:
> Hi Zhou,
>
> You can also remove the locks around ingenic_cgu_gate_get(), they are
> useless. Then also edit the doc of this function as currently it says
> that the caller must hold the lock.
>
Sure, I'll remove it in v4.
Thanks and best regards!
> -Paul
>
>
> Le sam., déc. 14, 2019 at 23:33, 周琰杰 (Zhou Yanjie)
> <zhouyanjie@wanyeetech.com> a écrit :
>> 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
>>
>
next prev parent reply other threads:[~2019-12-15 14:12 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 ` [PATCH v3 1/5] clk: Ingenic: Remove unnecessary spinlock when reading registers 周琰杰 (Zhou Yanjie)
2019-12-14 18:07 ` Paul Cercueil
2019-12-15 14:11 ` Zhou Yanjie [this message]
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=5DF63F2E.2040608@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 \
/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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
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).