linux-kernel - [PATCH v7 16/37] drm/tegra: vic: Stop channel before suspending

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Date:   Fri,  2 Jul 2021 02:27:07 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Viresh Kumar <vireshk@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>
Cc:     linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: [PATCH v7 16/37] drm/tegra: vic: Stop channel before suspending

Host1x channel should be idling before hardware is turned off, hence
stop the channel in the suspend callback.

Tested-by: Peter Geis <pgwipeout@...il.com> # Ouya T30
Tested-by: Paul Fertser <fercerpav@...il.com> # PAZ00 T20
Tested-by: Nicolas Chauvet <kwizart@...il.com> # PAZ00 T20 and TK1 T124
Tested-by: Matt Merhar <mattmerhar@...tonmail.com> # Ouya T30
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/gpu/drm/tegra/vic.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/tegra/vic.c b/drivers/gpu/drm/tegra/vic.c
index c9d55a9a3180..3bf08893b561 100644
--- a/drivers/gpu/drm/tegra/vic.c
+++ b/drivers/gpu/drm/tegra/vic.c
@@ -525,8 +525,23 @@ static int vic_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static __maybe_unused int vic_suspend(struct device *dev)
+{
+	struct vic *vic = dev_get_drvdata(dev);
+	int err;
+
+	host1x_channel_stop(vic->channel);
+
+	err = pm_runtime_force_suspend(dev);
+	if (err < 0)
+		return err;
+
+	return 0;
+}
+
 static const struct dev_pm_ops vic_pm_ops = {
 	SET_RUNTIME_PM_OPS(vic_runtime_suspend, vic_runtime_resume, NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(vic_suspend, pm_runtime_force_resume)
 };
 
 struct platform_driver tegra_vic_driver = {
-- 
2.30.2