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From: Stephen Boyd <swboyd@chromium.org>
To: Kuogee Hsieh <khsieh@codeaurora.org>,
	robdclark@gmail.com, sean@poorly.run
Cc: abhinavk@codeaurora.org, aravindh@codeaurora.org,
	airlied@linux.ie, daniel@ffwll.ch, linux-arm-msm@vger.kernel.org,
	dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 1/4] drm/msm/dp: check sink_count before update is_connected status
Date: Mon, 3 May 2021 21:30:44 -0700	[thread overview]
Message-ID: <CAE-0n53_CMed87hPgBFjN_dmRrPkfG3ZBjHCni2+2kxp_QfFpw@mail.gmail.com> (raw)
In-Reply-To: <1619048258-8717-2-git-send-email-khsieh@codeaurora.org>

Quoting Kuogee Hsieh (2021-04-21 16:37:35)
> Link status is different from display connected status in the case
> of something like an Apple dongle where the type-c plug can be
> connected, and therefore the link is connected, but no sink is
> connected until an HDMI cable is plugged into the dongle.
> The sink_count of DPCD of dongle will increase to 1 once an HDMI
> cable is plugged into the dongle so that display connected status
> will become true. This checking also apply at pm_resume.
>
> Changes in v4:
> -- none
>
> Fixes: 94e58e2d06e3 ("drm/msm/dp: reset dp controller only at boot up and pm_resume")
> Reported-by: Stephen Boyd <swboyd@chromium.org>
> Reviewed-by: Stephen Boyd <swboyd@chromium.org>
> Tested-by: Stephen Boyd <swboyd@chromium.org>
> Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
> ---
>  drivers/gpu/drm/msm/dp/dp_display.c | 15 ++++++++-------
>  1 file changed, 8 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index 5a39da6..0ba71c7 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -586,10 +586,8 @@ static int dp_connect_pending_timeout(struct dp_display_private *dp, u32 data)
>         mutex_lock(&dp->event_mutex);
>
>         state = dp->hpd_state;
> -       if (state == ST_CONNECT_PENDING) {
> -               dp_display_enable(dp, 0);
> +       if (state == ST_CONNECT_PENDING)
>                 dp->hpd_state = ST_CONNECTED;
> -       }

This part has been there since commit 8ede2ecc3e5e ("drm/msm/dp: Add DP
compliance tests on Snapdragon Chipsets") so we should add that tag here
too, like

Fixes: 8ede2ecc3e5e ("drm/msm/dp: Add DP compliance tests on
Snapdragon Chipsets")

It would also be nice if this hunk was explained. It doesn't make sense
to me that a timeout would enable the display so maybe that can be
called out in the commit text about why we remove the call here.

  reply	other threads:[~2021-05-04  4:30 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-21 23:37 [PATCH v4 0/4] " Kuogee Hsieh
2021-04-21 23:37 ` [PATCH v4 1/4] drm/msm/dp: " Kuogee Hsieh
2021-05-04  4:30   ` Stephen Boyd [this message]
2021-04-21 23:37 ` [PATCH v4 2/4] drm/msm/dp: initialize audio_comp when audio starts Kuogee Hsieh
2021-05-04  4:32   ` Stephen Boyd
2021-04-21 23:37 ` [PATCH v4 3/4] drm/msm/dp: check main link status before start aux read Kuogee Hsieh
2021-05-04  4:42   ` Stephen Boyd
2021-04-21 23:37 ` [PATCH v4 4/4] drm/msm/dp: dp_link_parse_sink_count() return immediately if aux read failed Kuogee Hsieh
2021-05-04  4:35   ` Stephen Boyd
2021-11-25  7:32     ` Dmitry Baryshkov
2021-12-01 20:48       ` khsieh
2021-05-07  0:23 ` [PATCH v4 0/4] check sink_count before update is_connected status Rob Clark

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