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From 0b82a2b70f890e8dd7a46dfbfcce00bd7e434762 Mon Sep 17 00:00:00 2001
From: Stefan Eichenberger <stefan.eichenberger@toradex.com>
Date: Wed, 15 Nov 2023 13:13:36 +0100
Subject: [PATCH] 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.
Upstream-Status: Backport [0b82a2b70f890e8dd7a46dfbfcce00bd7e434762]
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
---
drivers/gpu/drm/bridge/lontium-lt8912b.c | 28 ++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/drivers/gpu/drm/bridge/lontium-lt8912b.c b/drivers/gpu/drm/bridge/lontium-lt8912b.c
index 03532efb893b..097ab04234b7 100644
--- 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(<8912_bridge_pm_ops),
},
.probe = lt8912_probe,
.remove = lt8912_remove,
--
2.40.1
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