From: Stephen Boyd <swboyd@chromium.org>
To: Lina Iyer <ilina@codeaurora.org>,
andy.gross@linaro.org, bjorn.andersson@linaro.org
Cc: linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org,
rnayak@codeaurora.org, linux-kernel@vger.kernel.org,
linux-pm@vger.kernel.org, dianders@chromium.org,
mkshah@codeaurora.org, Lina Iyer <ilina@codeaurora.org>
Subject: Re: [PATCH 2/2] drivers: qcom: rpmh-rsc: fix read back of trigger register
Date: Fri, 19 Jul 2019 11:22:48 -0700 [thread overview]
Message-ID: <5d320a79.1c69fb81.17c57.b9ba@mx.google.com> (raw)
In-Reply-To: <20190701152907.16407-2-ilina@codeaurora.org>
Quoting Lina Iyer (2019-07-01 08:29:07)
> When triggering a TCS to send its contents, reading back the trigger
> value may return an incorrect value. That is because, writing the
> trigger may raise an interrupt which could be handled immediately and
> the trigger value could be reset in the interrupt handler. By doing a
> read back we may end up spinning waiting for the value we wrote.
Doesn't this need to be squashed into the patch that gets rid of the
irqs disabled state of this code? It sounds an awful lot like this
problem only happens now because the previous patch removed the
irqsave/irqrestore code around this function.
next prev parent reply other threads:[~2019-07-19 18:22 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-01 15:29 [PATCH 1/2] drivers: qcom: rpmh-rsc: simplify TCS locking Lina Iyer
2019-07-01 15:29 ` [PATCH 2/2] drivers: qcom: rpmh-rsc: fix read back of trigger register Lina Iyer
2019-07-01 15:53 ` Lina Iyer
2019-07-19 18:22 ` Stephen Boyd [this message]
2019-07-22 15:51 ` Lina Iyer
2019-07-01 15:52 ` [PATCH 1/2] drivers: qcom: rpmh-rsc: simplify TCS locking Lina Iyer
2019-07-19 18:20 ` Stephen Boyd
2019-07-22 16:20 ` Lina Iyer
2019-07-22 18:18 ` Stephen Boyd
2019-07-22 19:46 ` Lina Iyer
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=5d320a79.1c69fb81.17c57.b9ba@mx.google.com \
--to=swboyd@chromium.org \
--cc=andy.gross@linaro.org \
--cc=bjorn.andersson@linaro.org \
--cc=dianders@chromium.org \
--cc=ilina@codeaurora.org \
--cc=linux-arm-msm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pm@vger.kernel.org \
--cc=linux-soc@vger.kernel.org \
--cc=mkshah@codeaurora.org \
--cc=rnayak@codeaurora.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).