linux-kernel - [PATCH] drm/rockchip: Suspend DP late

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Message-Id: <20190802184616.44822-1-dianders@chromium.org>
Date:   Fri,  2 Aug 2019 11:46:16 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     Heiko Stuebner <heiko@...ech.de>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        seanpaul@...omium.org
Cc:     linux-rockchip@...ts.infradead.org, mka@...omium.org,
        Douglas Anderson <dianders@...omium.org>,
        Sandy Huang <hjc@...k-chips.com>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
        linux-arm-kernel@...ts.infradead.org,
        Daniel Vetter <daniel@...ll.ch>
Subject: [PATCH] drm/rockchip: Suspend DP late

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@...omium.org>
---

 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