From: Philipp Zabel <p.zabel@pengutronix.de>
To: Abel Vesa <abel.vesa@nxp.com>
Cc: Dong Aisheng <aisheng.dong@nxp.com>,
Rob Herring <robh@kernel.org>, Peng Fan <peng.fan@nxp.com>,
Fugang Duan <fugang.duan@nxp.com>, Jacky Bai <ping.bai@nxp.com>,
Anson Huang <anson.huang@nxp.com>,
devicetree@vger.kernel.org, Stephen Boyd <sboyd@kernel.org>,
Mike Turquette <mturquette@baylibre.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
NXP Linux Team <linux-imx@nxp.com>,
Sascha Hauer <kernel@pengutronix.de>,
Fabio Estevam <fabio.estevam@nxp.com>,
Shawn Guo <shawnguo@kernel.org>,
linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 11/17] clk: imx: Add blk_ctrl combo driver
Date: Wed, 26 Aug 2020 09:46:20 +0200 [thread overview]
Message-ID: <6a4757e808c2201dc212d1ccf63310b3fd5b2268.camel@pengutronix.de> (raw)
In-Reply-To: <20200825183009.olarh5ewkljeh35d@fsr-ub1664-175>
On Tue, 2020-08-25 at 21:30 +0300, Abel Vesa wrote:
[...]
> > if (assert)
> > pm_runtime_get_sync();
> > spin_lock_irqsave();
> > /* ... */
> > spin_unlock_irqrestore();
> > if (assert && asserted_before)
> > pm_runtime_put();
> >
>
> On a second thought this doesn't work because, for the first assertion,
> the runtime put will never be called, if the asserted_before does not count
> the current assertion.
I'm not sure I follow. The first assert will increment device usage
0 -> 1, all others asserts will just temporarily increment and decrement
1 -> 2 -> 1. Isn't this just missing one
if (!assert && !asserted_after)
pm_runtime_put()
to do the last deassert 1 -> 0 transition?
> If it counts the current assertion, then every assertion
> will end with runtime put. None of these options work here.
>
> How about the following:
>
> if (assert && !test_and_set_bit(1, &drvdata->rst_hws[id].asserted))
> pm_runtime_get_sync(rcdev->dev);
>
> spin_lock_irqsave(&drvdata->lock, flags);
>
> reg = readl(reg_addr);
> if (assert)
> writel(reg & ~(mask << shift), reg_addr);
> else
> writel(reg | (mask << shift), reg_addr);
>
> spin_unlock_irqrestore(&drvdata->lock, flags);
>
> if (!assert && test_and_clear_bit(1, &drvdata->rst_hws[id].asserted))
> pm_runtime_put(rcdev->dev);
>
> This would only call the get_sync/put once for each reset bit.
Yes, that should work. I think it is a much better idea, no more looping
through the entire reset control array.
regards
Philipp
next prev parent reply other threads:[~2020-08-26 7:46 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-14 12:09 [PATCH v2 00/17] Add BLK_CTRL support for i.MX8MP Abel Vesa
2020-08-14 12:09 ` [PATCH v2 01/17] dt-bindings: clocks: imx8mp: Rename audiomix ids clocks to audio_blk_ctrl Abel Vesa
2020-08-17 7:44 ` Dong Aisheng
2020-08-25 2:12 ` Rob Herring
2020-08-14 12:09 ` [PATCH v2 02/17] dt-bindings: reset: imx8mp: Add audio blk_ctrl reset IDs Abel Vesa
2020-08-17 7:45 ` Dong Aisheng
2020-08-25 2:13 ` Rob Herring
2020-08-14 12:09 ` [PATCH v2 03/17] dt-bindings: clock: imx8mp: Add ids for the audio shared gate Abel Vesa
2020-08-17 7:45 ` Dong Aisheng
2020-08-14 12:09 ` [PATCH v2 04/17] dt-bindings: clock: imx8mp: Add media blk_ctrl clock IDs Abel Vesa
2020-08-17 7:46 ` Dong Aisheng
2020-08-14 12:09 ` [PATCH v2 05/17] dt-bindings: reset: imx8mp: Add media blk_ctrl reset IDs Abel Vesa
2020-08-17 7:47 ` Dong Aisheng
2020-08-14 12:09 ` [PATCH v2 06/17] dt-bindings: clock: imx8mp: Add hdmi blk_ctrl clock IDs Abel Vesa
2020-08-14 12:09 ` [PATCH v2 07/17] dt-bindings: reset: imx8mp: Add hdmi blk_ctrl reset IDs Abel Vesa
2020-08-17 7:47 ` Dong Aisheng
2020-08-14 12:09 ` [PATCH v2 08/17] clk: imx8mp: Add audio shared gate Abel Vesa
2020-08-17 7:48 ` Dong Aisheng
2020-08-14 12:09 ` [PATCH v2 09/17] arm64: dts: Remove imx-hdmimix-reset header file Abel Vesa
2020-08-17 7:51 ` Dong Aisheng
2020-08-19 20:09 ` Abel Vesa
2020-08-14 12:09 ` [PATCH v2 10/17] Documentation: bindings: clk: Add bindings for i.MX BLK_CTRL Abel Vesa
2020-08-17 8:07 ` Dong Aisheng
2020-08-25 2:14 ` Rob Herring
2020-08-14 12:09 ` [PATCH v2 11/17] clk: imx: Add blk_ctrl combo driver Abel Vesa
2020-08-18 11:27 ` Dong Aisheng
2020-08-19 20:31 ` Abel Vesa
2020-08-20 1:40 ` Dong Aisheng
2020-08-25 10:48 ` Philipp Zabel
2020-08-25 11:24 ` Abel Vesa
2020-08-25 12:07 ` Philipp Zabel
2020-08-25 14:11 ` Abel Vesa
2020-08-25 18:30 ` Abel Vesa
2020-08-26 7:46 ` Philipp Zabel [this message]
2020-08-14 12:09 ` [PATCH v2 12/17] clk: imx8mp: Add audio blk_ctrl clocks and resets Abel Vesa
2020-08-18 11:29 ` Dong Aisheng
2020-08-19 20:33 ` Abel Vesa
2020-08-14 12:09 ` [PATCH v2 13/17] clk: imx8mp: Add hdmi " Abel Vesa
2020-08-14 12:09 ` [PATCH v2 14/17] clk: imx8mp: Add media " Abel Vesa
2020-08-14 12:09 ` [PATCH v2 15/17] arm64: dts: imx8mp: Add audio_blk_ctrl node Abel Vesa
2020-08-18 11:32 ` Dong Aisheng
2020-08-19 20:33 ` Abel Vesa
2020-08-14 12:09 ` [PATCH v2 16/17] arm64: dts: imx8mp: Add media_blk_ctrl node Abel Vesa
2020-08-18 11:34 ` Dong Aisheng
2020-08-19 20:37 ` Abel Vesa
2020-08-20 1:31 ` Dong Aisheng
2020-09-07 9:11 ` Abel Vesa
2020-08-14 12:09 ` [PATCH v2 17/17] arm64: dts: imx8mp: Add hdmi_blk_ctrl node Abel Vesa
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=6a4757e808c2201dc212d1ccf63310b3fd5b2268.camel@pengutronix.de \
--to=p.zabel@pengutronix.de \
--cc=abel.vesa@nxp.com \
--cc=aisheng.dong@nxp.com \
--cc=anson.huang@nxp.com \
--cc=devicetree@vger.kernel.org \
--cc=fabio.estevam@nxp.com \
--cc=fugang.duan@nxp.com \
--cc=kernel@pengutronix.de \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-clk@vger.kernel.org \
--cc=linux-imx@nxp.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mturquette@baylibre.com \
--cc=peng.fan@nxp.com \
--cc=ping.bai@nxp.com \
--cc=robh@kernel.org \
--cc=sboyd@kernel.org \
--cc=shawnguo@kernel.org \
/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).