From: Sean Paul <sean@poorly.run>
To: Douglas Anderson <dianders@chromium.org>
Cc: Heiko Stuebner <heiko@sntech.de>,
Tomeu Vizoso <tomeu.vizoso@collabora.com>,
David Airlie <airlied@linux.ie>, Sandy Huang <hjc@rock-chips.com>,
dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
linux-rockchip@lists.infradead.org, mka@chromium.org,
seanpaul@chromium.org, Daniel Vetter <daniel@ffwll.ch>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] drm/rockchip: Suspend DP late
Date: Fri, 2 Aug 2019 15:26:29 -0400 [thread overview]
Message-ID: <20190802192629.GX104440@art_vandelay> (raw)
In-Reply-To: <20190802184616.44822-1-dianders@chromium.org>
On Fri, Aug 02, 2019 at 11:46:16AM -0700, Douglas Anderson wrote:
> In commit fe64ba5c6323 ("drm/rockchip: Resume DP early") we moved
> resume to be early but left suspend at its normal time. This seems
> like it could be OK, but casues problems if a suspend gets interrupted
> partway through. The OS only balances matching suspend/resume levels.
> ...so if suspend was called then resume will be called. If suspend
> late was called then resume early will be called. ...but if suspend
> was called resume early might not get called. This leads to an
> unbalance in the clock enables / disables.
>
> Lets take the simple fix and just move suspend to be late to match.
> This makes the PM core take proper care in keeping things balanced.
>
> Fixes: fe64ba5c6323 ("drm/rockchip: Resume DP early")
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Sean Paul <sean@poorly.run>
This should go in -misc-fixes and due to some... administrative reasons... I
will leave it on the list until Maarten has a chance to ff to -rc4 on Monday.
I'll apply it then so as to not require a backmerge.
Sean
> ---
>
> drivers/gpu/drm/rockchip/analogix_dp-rockchip.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> index 7d7cb57410fc..f38f5e113c6b 100644
> --- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> +++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> @@ -436,7 +436,7 @@ static int rockchip_dp_resume(struct device *dev)
>
> static const struct dev_pm_ops rockchip_dp_pm_ops = {
> #ifdef CONFIG_PM_SLEEP
> - .suspend = rockchip_dp_suspend,
> + .suspend_late = rockchip_dp_suspend,
> .resume_early = rockchip_dp_resume,
> #endif
> };
> --
> 2.22.0.770.g0f2c4a37fd-goog
>
--
Sean Paul, Software Engineer, Google / Chromium OS
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next prev parent reply other threads:[~2019-08-02 19:26 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-02 18:46 [PATCH] drm/rockchip: Suspend DP late Douglas Anderson
2019-08-02 19:26 ` Sean Paul [this message]
2019-08-05 15:11 ` Sean Paul
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