diff mbox series

[v2,2/2] drm/bridge: it6505: Add pre_enable/post_disable callback

Message ID 20221003050335.1007931-3-treapking@chromium.org (mailing list archive)
State New, archived
Headers show
Series drm/bridge: it6505: Power management fixes for it6505 bridge | expand

Commit Message

Pin-yen Lin Oct. 3, 2022, 5:03 a.m. UTC 
Add atomic_pre_enable and atomic_post_disable callback to make sure the
bridge is not powered off until atomic_post_disable is called. This
prevents a power leakage when it6505 is powered off, but the upstream
DRM bridge is still sending display signals.

Fixes: b5c84a9edcd4 ("drm/bridge: add it6505 driver")
Signed-off-by: Pin-yen Lin <treapking@chromium.org>

---

(no changes since v1)

 drivers/gpu/drm/bridge/ite-it6505.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

Comments

AngeloGioacchino Del Regno Oct. 3, 2022, 11:38 a.m. UTC | #1 
Il 03/10/22 07:03, Pin-yen Lin ha scritto:
> Add atomic_pre_enable and atomic_post_disable callback to make sure the
> bridge is not powered off until atomic_post_disable is called. This
> prevents a power leakage when it6505 is powered off, but the upstream
> DRM bridge is still sending display signals.
> 
> Fixes: b5c84a9edcd4 ("drm/bridge: add it6505 driver")
> Signed-off-by: Pin-yen Lin <treapking@chromium.org>
> 

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
diff mbox series

Patch

diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index 685d8e750b12..27de6652f842 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -2992,6 +2992,28 @@  static void it6505_bridge_atomic_disable(struct drm_bridge *bridge,
 	}
 }
 
+static void it6505_bridge_atomic_pre_enable(struct drm_bridge *bridge,
+					    struct drm_bridge_state *old_state)
+{
+	struct it6505 *it6505 = bridge_to_it6505(bridge);
+	struct device *dev = &it6505->client->dev;
+
+	DRM_DEV_DEBUG_DRIVER(dev, "start");
+
+	pm_runtime_get_sync(dev);
+}
+
+static void it6505_bridge_atomic_post_disable(struct drm_bridge *bridge,
+					      struct drm_bridge_state *old_state)
+{
+	struct it6505 *it6505 = bridge_to_it6505(bridge);
+	struct device *dev = &it6505->client->dev;
+
+	DRM_DEV_DEBUG_DRIVER(dev, "start");
+
+	pm_runtime_put_sync(dev);
+}
+
 static enum drm_connector_status
 it6505_bridge_detect(struct drm_bridge *bridge)
 {
@@ -3026,6 +3048,8 @@  static const struct drm_bridge_funcs it6505_bridge_funcs = {
 	.mode_valid = it6505_bridge_mode_valid,
 	.atomic_enable = it6505_bridge_atomic_enable,
 	.atomic_disable = it6505_bridge_atomic_disable,
+	.atomic_pre_enable = it6505_bridge_atomic_pre_enable,
+	.atomic_post_disable = it6505_bridge_atomic_post_disable,
 	.detect = it6505_bridge_detect,
 	.get_edid = it6505_bridge_get_edid,
 };