From: Stephen Boyd <swboyd@chromium.org>
To: Kuogee Hsieh <khsieh@codeaurora.org>,
agross@kernel.org, bjorn.andersson@linaro.org,
robdclark@gmail.com, sean@poorly.run, vkoul@kernel.org
Cc: abhinavk@codeaurora.org, aravindh@codeaurora.org,
freedreno@lists.freedesktop.org, linux-arm-msm@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4] drm/msm/dp: power off DP phy at suspend
Date: Wed, 2 Jun 2021 17:23:04 -0700 [thread overview]
Message-ID: <CAE-0n522L0hmAK40xj3TGimBjeqQgqO2YWsGOrYv-BPqr33tkA@mail.gmail.com> (raw)
In-Reply-To: <1622652185-7157-1-git-send-email-khsieh@codeaurora.org>
Quoting Kuogee Hsieh (2021-06-02 09:43:05)
> Normal DP suspend operation contains two steps, display off followed
> by dp suspend, to complete system wide suspending cycle if display is
> up at that time. In this case, DP phy will be powered off at display
> off. However there is an exception case that depending on the timing
> of dongle plug in during system wide suspending, sometimes display off
> procedure may be skipped and dp suspend was called directly. In this
> case, dp phy is stay at powered on (phy->power_count = 1) so that at
> next resume dp driver crash at main link clock enable due to phy is
> not physically powered on. This patch will call dp_ctrl_off_link_stream()
> to tear down main link and power off phy at dp_pm_suspend() if main link
> had been brought up.
>
> Changes in V2:
> -- stashed changes into dp_ctrl.c
> -- add is_phy_on to monitor phy state
>
> Changes in V3:
> -- delete is_phy_on
> -- call dp_ctrl_off_link_stream() from dp_pm_suspend()
>
> Changes in V4:
> -- delete changes made at dp_power.c
> -- move main link status checking to dp_pm_suspend
>
> Fixes: 0114f31a2903 ("drm/msm/dp: handle irq_hpd with sink_count = 0 correctly)
> Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
> ---
Ok, this seems to work and is nice and small
Tested-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
next prev parent reply other threads:[~2021-06-03 0:23 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-02 16:43 [PATCH v4] drm/msm/dp: power off DP phy at suspend Kuogee Hsieh
2021-06-03 0:23 ` Stephen Boyd [this message]
2021-06-03 6:03 ` Stephen Boyd
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=CAE-0n522L0hmAK40xj3TGimBjeqQgqO2YWsGOrYv-BPqr33tkA@mail.gmail.com \
--to=swboyd@chromium.org \
--cc=abhinavk@codeaurora.org \
--cc=agross@kernel.org \
--cc=aravindh@codeaurora.org \
--cc=bjorn.andersson@linaro.org \
--cc=freedreno@lists.freedesktop.org \
--cc=khsieh@codeaurora.org \
--cc=linux-arm-msm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=robdclark@gmail.com \
--cc=sean@poorly.run \
--cc=vkoul@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).