linux-kernel - [PATCH v3 2/2] drm/bridge: it6505: Add pre_enable/post

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Date:   Tue,  4 Oct 2022 12:49:43 +0800
From:   Pin-yen Lin <treapking@...omium.org>
To:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     Hsin-Yi Wang <hsinyi@...omium.org>,
        dri-devel@...ts.freedesktop.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        linux-kernel@...r.kernel.org, Hermes Wu <hermes.wu@....com.tw>,
        Allen Chen <allen.chen@....com.tw>,
        Pin-yen Lin <treapking@...omium.org>
Subject: [PATCH v3 2/2] drm/bridge: it6505: Add pre_enable/post_disable callback

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@...omium.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>

---

Changes in v3:
- Collect review tag

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

diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index 050f3be9adbc..922e1f2b7a35 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -2991,6 +2991,28 @@ 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)
 {
@@ -3025,6 +3047,8 @@ 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,
 };
-- 
2.38.0.rc1.362.ged0d419d3c-goog