linux-kernel - [PATCH v14 15/39] drm/tegra: nvdec: Stop channel on suspend

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Date:   Tue, 26 Oct 2021 01:40:08 +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 15/39] drm/tegra: nvdec: 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/nvdec.c | 29 ++++++++++++++++++-----------
 1 file changed, 18 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/tegra/nvdec.c b/drivers/gpu/drm/tegra/nvdec.c
index 48c90e26e90a..0f1146be9d6d 100644
--- a/drivers/gpu/drm/tegra/nvdec.c
+++ b/drivers/gpu/drm/tegra/nvdec.c
@@ -112,9 +112,13 @@ static int nvdec_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
@@ -124,7 +128,10 @@ static int nvdec_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(nvdec->channel);
@@ -149,10 +156,15 @@ static int nvdec_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(nvdec->channel);
 	host1x_client_iommu_detach(client);
 
+	nvdec->channel = NULL;
+
 	if (client->group) {
 		dma_unmap_single(nvdec->dev, nvdec->falcon.firmware.phys,
 				 nvdec->falcon.firmware.size, DMA_TO_DEVICE);
@@ -267,6 +279,8 @@ static int nvdec_runtime_suspend(struct device *dev)
 {
 	struct nvdec *nvdec = dev_get_drvdata(dev);
 
+	host1x_channel_stop(nvdec->channel);
+
 	clk_disable_unprepare(nvdec->clk);
 
 	return 0;
@@ -411,10 +425,6 @@ static int nvdec_probe(struct platform_device *pdev)
 		goto exit_falcon;
 	}
 
-	pm_runtime_enable(&pdev->dev);
-	pm_runtime_set_autosuspend_delay(&pdev->dev, 500);
-	pm_runtime_use_autosuspend(&pdev->dev);
-
 	return 0;
 
 exit_falcon:
@@ -435,11 +445,6 @@ static int nvdec_remove(struct platform_device *pdev)
 		return err;
 	}
 
-	if (pm_runtime_enabled(&pdev->dev))
-		pm_runtime_disable(&pdev->dev);
-	else
-		nvdec_runtime_suspend(&pdev->dev);
-
 	falcon_exit(&nvdec->falcon);
 
 	return 0;
@@ -447,6 +452,8 @@ static int nvdec_remove(struct platform_device *pdev)
 
 static const struct dev_pm_ops nvdec_pm_ops = {
 	SET_RUNTIME_PM_OPS(nvdec_runtime_suspend, nvdec_runtime_resume, NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				pm_runtime_force_resume)
 };
 
 struct platform_driver tegra_nvdec_driver = {
-- 
2.33.1