drm/bridge: lt8912b: Add suspend/resume support

Add support for suspend and resume. The lt8912b will power off when
going into suspend and power on when resuming.

Signed-off-by: Stefan Eichenberger <stefan.eichenberger@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Reviewed-by: Robert Foss <rfoss@kernel.org>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231115121338.22959-2-francesco@dolcini.it

diff --git a/drivers/gpu/drm/bridge/lontium-lt8912b.c b/drivers/gpu/drm/bridge/lontium-lt8912b.c
index 03532efb893bbc913f2a31a1f491849464a986f2..097ab04234b730c588f43a021d41bf6f7a3d1202 100644 (file)
--- a/drivers/gpu/drm/bridge/lontium-lt8912b.c
+++ b/drivers/gpu/drm/bridge/lontium-lt8912b.c
@@ -634,6 +634,33 @@ static const struct drm_bridge_funcs lt8912_bridge_funcs = {
        .get_edid = lt8912_bridge_get_edid,
 };
 
+static int lt8912_bridge_resume(struct device *dev)
+{
+       struct lt8912 *lt = dev_get_drvdata(dev);
+       int ret;
+
+       ret = lt8912_hard_power_on(lt);
+       if (ret)
+               return ret;
+
+       ret = lt8912_soft_power_on(lt);
+       if (ret)
+               return ret;
+
+       return lt8912_video_on(lt);
+}
+
+static int lt8912_bridge_suspend(struct device *dev)
+{
+       struct lt8912 *lt = dev_get_drvdata(dev);
+
+       lt8912_hard_power_off(lt);
+
+       return 0;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(lt8912_bridge_pm_ops, lt8912_bridge_suspend, lt8912_bridge_resume);
+
 static int lt8912_parse_dt(struct lt8912 *lt)
 {
        struct gpio_desc *gp_reset;
@@ -770,6 +797,7 @@ static struct i2c_driver lt8912_i2c_driver = {
        .driver = {
                .name = "lt8912",
                .of_match_table = lt8912_dt_match,
+               .pm = pm_sleep_ptr(&lt8912_bridge_pm_ops),
        },
        .probe = lt8912_probe,
        .remove = lt8912_remove,