linux-kernel - [PATCH v14 14/39] drm/tegra: vic: Stop channel on suspend

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Date:   Tue, 26 Oct 2021 01:40:07 +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>,
        Mikko Perttunen <mperttunen@...dia.com>,
        Lee Jones <lee.jones@...aro.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Nishanth Menon <nm@...com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Michael Turquette <mturquette@...libre.com>
Cc:     linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-pwm@...r.kernel.org,
        linux-mmc@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-clk@...r.kernel.org, David Heidelberg <david@...t.cz>
Subject: [PATCH v14 14/39] drm/tegra: vic: Stop channel on suspend

CDMA must be stopped before hardware is suspended. Add channel stopping
to RPM suspend callback. Add system level suspend-resume callbacks.

Runtime PM initialization is moved to host1x client init phase because
RPM callback now uses host1x channel that is available only when host1x
client is registered.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/gpu/drm/tegra/vic.c | 36 ++++++++++++++++++------------------
 1 file changed, 18 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/tegra/vic.c b/drivers/gpu/drm/tegra/vic.c
index b58e2b99f81a..9622ca96c539 100644
--- a/drivers/gpu/drm/tegra/vic.c
+++ b/drivers/gpu/drm/tegra/vic.c
@@ -151,9 +151,13 @@ static int vic_init(struct host1x_client *client)
 		goto free_channel;
 	}
 
+	pm_runtime_enable(client->dev);
+	pm_runtime_use_autosuspend(client->dev);
+	pm_runtime_set_autosuspend_delay(client->dev, 500);
+
 	err = tegra_drm_register_client(tegra, drm);
 	if (err < 0)
-		goto free_syncpt;
+		goto disable_rpm;
 
 	/*
 	 * Inherit the DMA parameters (such as maximum segment size) from the
@@ -163,7 +167,10 @@ static int vic_init(struct host1x_client *client)
 
 	return 0;
 
-free_syncpt:
+disable_rpm:
+	pm_runtime_dont_use_autosuspend(client->dev);
+	pm_runtime_force_suspend(client->dev);
+
 	host1x_syncpt_put(client->syncpts[0]);
 free_channel:
 	host1x_channel_put(vic->channel);
@@ -188,10 +195,15 @@ static int vic_exit(struct host1x_client *client)
 	if (err < 0)
 		return err;
 
+	pm_runtime_dont_use_autosuspend(client->dev);
+	pm_runtime_force_suspend(client->dev);
+
 	host1x_syncpt_put(client->syncpts[0]);
 	host1x_channel_put(vic->channel);
 	host1x_client_iommu_detach(client);
 
+	vic->channel = NULL;
+
 	if (client->group) {
 		dma_unmap_single(vic->dev, vic->falcon.firmware.phys,
 				 vic->falcon.firmware.size, DMA_TO_DEVICE);
@@ -315,6 +327,8 @@ static int vic_runtime_suspend(struct device *dev)
 	struct vic *vic = dev_get_drvdata(dev);
 	int err;
 
+	host1x_channel_stop(vic->channel);
+
 	err = reset_control_assert(vic->rst);
 	if (err < 0)
 		return err;
@@ -482,19 +496,8 @@ static int vic_probe(struct platform_device *pdev)
 		goto exit_falcon;
 	}
 
-	pm_runtime_enable(&pdev->dev);
-	if (!pm_runtime_enabled(&pdev->dev)) {
-		err = vic_runtime_resume(&pdev->dev);
-		if (err < 0)
-			goto unregister_client;
-	}
-	pm_runtime_set_autosuspend_delay(&pdev->dev, 500);
-	pm_runtime_use_autosuspend(&pdev->dev);
-
 	return 0;
 
-unregister_client:
-	host1x_client_unregister(&vic->client.base);
 exit_falcon:
 	falcon_exit(&vic->falcon);
 
@@ -513,11 +516,6 @@ static int vic_remove(struct platform_device *pdev)
 		return err;
 	}
 
-	if (pm_runtime_enabled(&pdev->dev))
-		pm_runtime_disable(&pdev->dev);
-	else
-		vic_runtime_suspend(&pdev->dev);
-
 	falcon_exit(&vic->falcon);
 
 	return 0;
@@ -525,6 +523,8 @@ static int vic_remove(struct platform_device *pdev)
 
 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(pm_runtime_force_suspend,
+				pm_runtime_force_resume)
 };
 
 struct platform_driver tegra_vic_driver = {
-- 
2.33.1