linux-kernel - [PATCH] drm: sun4i: Add support for suspending the display driver

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Date:   Mon, 28 Oct 2019 22:43:13 +0100
From:   Ondrej Jirman <megous@...ous.com>
To:     linux-sunxi@...glegroups.com
Cc:     Ondrej Jirman <megous@...ous.com>,
        Maxime Ripard <mripard@...nel.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Chen-Yu Tsai <wens@...e.org>,
        dri-devel@...ts.freedesktop.org (open list:DRM DRIVERS FOR ALLWINNER
        A10),
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM/Allwinner
        sunXi SoC support), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] drm: sun4i: Add support for suspending the display driver

Shut down the display engine during suspend.

Signed-off-by: Ondrej Jirman <megous@...ous.com>
---
 drivers/gpu/drm/sun4i/sun4i_drv.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4i_drv.c
index a5757b11b730..c519d7cfcf43 100644
--- a/drivers/gpu/drm/sun4i/sun4i_drv.c
+++ b/drivers/gpu/drm/sun4i/sun4i_drv.c
@@ -346,6 +346,27 @@ static int sun4i_drv_add_endpoints(struct device *dev,
 	return count;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int sun4i_drv_drm_sys_suspend(struct device *dev)
+{
+        struct drm_device *drm = dev_get_drvdata(dev);
+
+        return drm_mode_config_helper_suspend(drm);
+}
+
+static int sun4i_drv_drm_sys_resume(struct device *dev)
+{
+        struct drm_device *drm = dev_get_drvdata(dev);
+
+        return drm_mode_config_helper_resume(drm);
+}
+#endif
+
+static const struct dev_pm_ops sun4i_drv_drm_pm_ops = {
+        SET_SYSTEM_SLEEP_PM_OPS(sun4i_drv_drm_sys_suspend,
+                                sun4i_drv_drm_sys_resume)
+};
+
 static int sun4i_drv_probe(struct platform_device *pdev)
 {
 	struct component_match *match = NULL;
@@ -418,6 +439,7 @@ static struct platform_driver sun4i_drv_platform_driver = {
 	.driver		= {
 		.name		= "sun4i-drm",
 		.of_match_table	= sun4i_drv_of_table,
+		.pm = &sun4i_drv_drm_pm_ops,
 	},
 };
 module_platform_driver(sun4i_drv_platform_driver);
-- 
2.23.0