linux-kernel - [v3] drm/bridge: ti-sn65dsi86: ensure bridge suspend happens during PM sleep

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Message-Id: <20200609120455.20458-1-harigovi@codeaurora.org>
Date:   Tue,  9 Jun 2020 17:34:55 +0530
From:   Harigovindan P <harigovi@...eaurora.org>
To:     dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org
Cc:     Harigovindan P <harigovi@...eaurora.org>,
        linux-kernel@...r.kernel.org, robdclark@...il.com,
        seanpaul@...omium.org, hoegsberg@...omium.org,
        kalyan_t@...eaurora.org, nganji@...eaurora.org, sam@...nborg.org
Subject: [v3] drm/bridge: ti-sn65dsi86: ensure bridge suspend happens during PM sleep

ti-sn65dsi86 bridge is enumerated as a runtime device. When
suspend is triggered, PM core adds a refcount on all the
devices and calls device suspend, since usage count is
already incremented, runtime suspend will not be called
and it kept the bridge regulators and gpios ON which resulted
in platform not entering into XO shutdown.

Add changes to force suspend on the runtime device during pm sleep.

Signed-off-by: Harigovindan P <harigovi@...eaurora.org>
---

Changes in v2:
	- Include bridge name in the commit message and 
	remove dependent patchwork link from the commit
	text as bridge is independent of OEM(Stephen Boyd)

Changes in v3:
	- Updating changelog to explain the need for patch

 drivers/gpu/drm/bridge/ti-sn65dsi86.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index 6ad688b320ae..2eef755b2917 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -159,6 +159,8 @@ static int __maybe_unused ti_sn_bridge_suspend(struct device *dev)
 
 static const struct dev_pm_ops ti_sn_bridge_pm_ops = {
 	SET_RUNTIME_PM_OPS(ti_sn_bridge_suspend, ti_sn_bridge_resume, NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				pm_runtime_force_resume)
 };
 
 static int status_show(struct seq_file *s, void *data)
-- 
2.27.0