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From: khsieh@codeaurora.org
To: Stephen Boyd <swboyd@chromium.org>
Cc: agross@kernel.org, bjorn.andersson@linaro.org,
	robdclark@gmail.com, sean@poorly.run, vkoul@kernel.org,
	abhinavk@codeaurora.org, aravindh@codeaurora.org,
	freedreno@lists.freedesktop.org, linux-arm-msm@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5] drm/msm/dp: power off DP phy at suspend
Date: Thu, 03 Jun 2021 14:59:49 -0700	[thread overview]
Message-ID: <3f62fc2142f6089c43ec3a4b7b10cadc@codeaurora.org> (raw)
In-Reply-To: <CAE-0n51-CsHPwYmceUq1kTaG=L+ifG3kX2pxJxTG_=r4Xm67_g@mail.gmail.com>

On 2021-06-03 13:22, Stephen Boyd wrote:
> Can you Cc dri-devel?
> 
Sorry for dropping this cc.
Should I re submit this v5 with cc=dri-devel?



> Quoting Kuogee Hsieh (2021-06-03 08:40:46)
>> 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.
>> 

  reply	other threads:[~2021-06-03 21:59 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-03 15:40 [PATCH v5] drm/msm/dp: power off DP phy at suspend Kuogee Hsieh
2021-06-03 20:22 ` Stephen Boyd
2021-06-03 21:59   ` khsieh [this message]
2021-06-03 23:19     ` Stephen Boyd
2021-06-03 23:49 Kuogee Hsieh

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