linux-kernel - [PATCH 02/10] drm/tidss: Use PM autosuspend

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Date:   Wed, 01 Nov 2023 11:17:39 +0200
From:   Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To:     Aradhya Bhatia <a-bhatia1@...com>,
        Devarsh Thakkar <devarsht@...com>,
        Jyri Sarha <jyri.sarha@....fi>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Subject: [PATCH 02/10] drm/tidss: Use PM autosuspend

Use runtime PM autosuspend feature, with 1s timeout, to avoid
unnecessary suspend-resume cycles when, e.g. the userspace temporarily
turns off the crtcs when configuring the outputs.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
---
 drivers/gpu/drm/tidss/tidss_drv.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tidss/tidss_drv.c b/drivers/gpu/drm/tidss/tidss_drv.c
index f403db11b846..64914331715a 100644
--- a/drivers/gpu/drm/tidss/tidss_drv.c
+++ b/drivers/gpu/drm/tidss/tidss_drv.c
@@ -43,7 +43,9 @@ void tidss_runtime_put(struct tidss_device *tidss)
 
 	dev_dbg(tidss->dev, "%s\n", __func__);
 
-	r = pm_runtime_put_sync(tidss->dev);
+	pm_runtime_mark_last_busy(tidss->dev);
+
+	r = pm_runtime_put_autosuspend(tidss->dev);
 	WARN_ON(r < 0);
 }
 
@@ -144,6 +146,9 @@ static int tidss_probe(struct platform_device *pdev)
 
 	pm_runtime_enable(dev);
 
+	pm_runtime_set_autosuspend_delay(dev, 1000);
+	pm_runtime_use_autosuspend(dev);
+
 #ifndef CONFIG_PM
 	/* If we don't have PM, we need to call resume manually */
 	dispc_runtime_resume(tidss->dispc);
@@ -215,6 +220,7 @@ static void tidss_remove(struct platform_device *pdev)
 	/* If we don't have PM, we need to call suspend manually */
 	dispc_runtime_suspend(tidss->dispc);
 #endif
+	pm_runtime_dont_use_autosuspend(dev);
 	pm_runtime_disable(dev);
 
 	/* devm allocated dispc goes away with the dev so mark it NULL */

-- 
2.34.1