linux-kernel - [PATCH v3 2/2] drm/bridge: analogix

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Date:   Thu, 17 Feb 2022 14:41:46 -0800
From:   Brian Norris <briannorris@...omium.org>
To:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <narmstrong@...libre.com>
Cc:     linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        Doug Anderson <dianders@...omium.org>,
        Sean Paul <sean@...rly.run>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        dri-devel@...ts.freedesktop.org,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Brian Norris <briannorris@...omium.org>
Subject: [PATCH v3 2/2] drm/bridge: analogix_dp: Enable autosuspend

DP AUX transactions can consist of many short operations. There's no
need to power things up/down in short intervals.

I pick an arbitrary 100ms; for the systems I'm testing (Rockchip
RK3399), runtime-PM transitions only take a few microseconds.

Signed-off-by: Brian Norris <briannorris@...omium.org>
---

Changes in v3:
 - New in v3

 drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index 16be279aed2c..d82a4ddf44e7 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -1121,7 +1121,7 @@ static int analogix_dp_get_modes(struct drm_connector *connector)
 
 		pm_runtime_get_sync(dp->dev);
 		edid = drm_get_edid(connector, &dp->aux.ddc);
-		pm_runtime_put(dp->dev);
+		pm_runtime_put_autosuspend(dp->dev);
 		if (edid) {
 			drm_connector_update_edid_property(&dp->connector,
 							   edid);
@@ -1642,7 +1642,7 @@ static ssize_t analogix_dpaux_transfer(struct drm_dp_aux *aux,
 
 	ret = analogix_dp_transfer(dp, msg);
 out:
-	pm_runtime_put(dp->dev);
+	pm_runtime_put_autosuspend(dp->dev);
 
 	return ret;
 }
@@ -1775,6 +1775,8 @@ int analogix_dp_bind(struct analogix_dp_device *dp, struct drm_device *drm_dev)
 	if (ret)
 		return ret;
 
+	pm_runtime_use_autosuspend(dp->dev);
+	pm_runtime_set_autosuspend_delay(dp->dev, 100);
 	pm_runtime_enable(dp->dev);
 
 	ret = analogix_dp_create_bridge(drm_dev, dp);
-- 
2.35.1.265.g69c8d7142f-goog