MLK-21312: drm/panel: rm67191: Add support for suspend/resume
The 'reset' pin used by this panel driver is shared with the touchscreen
driver, which is causing issues during suspend/resume process. In order
to better handle this gpio pin, release its resource during suspend and
acquire it again in resume.
Signed-off-by: Robert Chiras <robert.chiras@nxp.com>
diff --git a/drivers/gpu/drm/panel/panel-raydium-rm67191.c b/drivers/gpu/drm/panel/panel-raydium-rm67191.c
index 86ca2ea..7e9682a 100644
--- a/drivers/gpu/drm/panel/panel-raydium-rm67191.c
+++ b/drivers/gpu/drm/panel/panel-raydium-rm67191.c
@@ -635,6 +635,7 @@
drm_panel_init(&panel->base);
panel->base.funcs = &rad_panel_funcs;
panel->base.dev = dev;
+ dev_set_drvdata(dev, panel);
ret = drm_panel_add(&panel->base);
@@ -672,6 +673,41 @@
rad_panel_unprepare(&rad->base);
}
+#ifdef CONFIG_PM
+static int rad_panel_suspend(struct device *dev)
+{
+ struct rad_panel *rad = dev_get_drvdata(dev);
+
+ if (!rad->reset)
+ return 0;
+
+ devm_gpiod_put(dev, rad->reset);
+ rad->reset = NULL;
+
+ return 0;
+}
+
+static int rad_panel_resume(struct device *dev)
+{
+ struct rad_panel *rad = dev_get_drvdata(dev);
+
+ if (rad->reset)
+ return 0;
+
+ rad->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(rad->reset))
+ rad->reset = NULL;
+
+ return PTR_ERR_OR_ZERO(rad->reset);
+}
+
+#endif
+
+static const struct dev_pm_ops rad_pm_ops = {
+ SET_RUNTIME_PM_OPS(rad_panel_suspend, rad_panel_resume, NULL)
+ SET_SYSTEM_SLEEP_PM_OPS(rad_panel_suspend, rad_panel_resume)
+};
+
static const struct of_device_id rad_of_match[] = {
{ .compatible = "raydium,rm67191", },
{ }
@@ -682,6 +718,7 @@
.driver = {
.name = "panel-raydium-rm67191",
.of_match_table = rad_of_match,
+ .pm = &rad_pm_ops,
},
.probe = rad_panel_probe,
.remove = rad_panel_remove,
