linux-kernel - [PATCH v2 03/10] drm: bridge: dw_hdmi: Call poweron/poweroff from atomic enable/disable

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Message-ID: <20240908132823.3308029-4-jonas@kwiboo.se>
Date: Sun,  8 Sep 2024 13:28:05 +0000
From: Jonas Karlman <jonas@...boo.se>
To: Andrzej Hajda <andrzej.hajda@...el.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Robert Foss <rfoss@...nel.org>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	Jonas Karlman <jonas@...boo.se>,
	Jernej Skrabec <jernej.skrabec@...il.com>
Cc: Christian Hewitt <christianshewitt@...il.com>,
	Diederik de Haas <didi.debian@...ow.org>,
	Christopher Obbard <chris.obbard@...labora.com>,
	dri-devel@...ts.freedesktop.org,
	linux-rockchip@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 03/10] drm: bridge: dw_hdmi: Call poweron/poweroff from atomic enable/disable

Change to only call poweron/poweroff from atomic_enable/atomic_disable
ops instead of trying to be clever by keeping a bridge_is_on state and
poweron/off in the hotplug irq handler.

The bridge is already enabled/disabled depending on connection state
with the call to drm_helper_hpd_irq_event() in hotplug irq handler.

A benefit of this is that drm mode_config mutex is always held at
poweron/off, something that may reduce the need for our own mutex.

Signed-off-by: Jonas Karlman <jonas@...boo.se>
---
v2: Update commit message
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 33 ++---------------------
 1 file changed, 2 insertions(+), 31 deletions(-)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index 055fc9848df4..5b67640b1d0a 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -169,7 +169,6 @@ struct dw_hdmi {
 	enum drm_connector_force force;	/* mutex-protected force state */
 	struct drm_connector *curr_conn;/* current connector (only valid when !disabled) */
 	bool disabled;			/* DRM has disabled our bridge */
-	bool bridge_is_on;		/* indicates the bridge is on */
 	bool rxsense;			/* rxsense state */
 	u8 phy_mask;			/* desired phy int mask settings */
 	u8 mc_clkdis;			/* clock disable register */
@@ -2382,8 +2381,6 @@ static void initialize_hdmi_ih_mutes(struct dw_hdmi *hdmi)
 
 static void dw_hdmi_poweron(struct dw_hdmi *hdmi)
 {
-	hdmi->bridge_is_on = true;
-
 	/*
 	 * The curr_conn field is guaranteed to be valid here, as this function
 	 * is only be called when !hdmi->disabled.
@@ -2397,30 +2394,6 @@ static void dw_hdmi_poweroff(struct dw_hdmi *hdmi)
 		hdmi->phy.ops->disable(hdmi, hdmi->phy.data);
 		hdmi->phy.enabled = false;
 	}
-
-	hdmi->bridge_is_on = false;
-}
-
-static void dw_hdmi_update_power(struct dw_hdmi *hdmi)
-{
-	int force = hdmi->force;
-
-	if (hdmi->disabled) {
-		force = DRM_FORCE_OFF;
-	} else if (force == DRM_FORCE_UNSPECIFIED) {
-		if (hdmi->rxsense)
-			force = DRM_FORCE_ON;
-		else
-			force = DRM_FORCE_OFF;
-	}
-
-	if (force == DRM_FORCE_OFF) {
-		if (hdmi->bridge_is_on)
-			dw_hdmi_poweroff(hdmi);
-	} else {
-		if (!hdmi->bridge_is_on)
-			dw_hdmi_poweron(hdmi);
-	}
 }
 
 /*
@@ -2545,7 +2518,6 @@ static void dw_hdmi_connector_force(struct drm_connector *connector)
 
 	mutex_lock(&hdmi->mutex);
 	hdmi->force = connector->force;
-	dw_hdmi_update_power(hdmi);
 	dw_hdmi_update_phy_mask(hdmi);
 	mutex_unlock(&hdmi->mutex);
 }
@@ -2954,7 +2926,7 @@ static void dw_hdmi_bridge_atomic_disable(struct drm_bridge *bridge,
 	mutex_lock(&hdmi->mutex);
 	hdmi->disabled = true;
 	hdmi->curr_conn = NULL;
-	dw_hdmi_update_power(hdmi);
+	dw_hdmi_poweroff(hdmi);
 	dw_hdmi_update_phy_mask(hdmi);
 	handle_plugged_change(hdmi, false);
 	mutex_unlock(&hdmi->mutex);
@@ -2973,7 +2945,7 @@ static void dw_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
 	mutex_lock(&hdmi->mutex);
 	hdmi->disabled = false;
 	hdmi->curr_conn = connector;
-	dw_hdmi_update_power(hdmi);
+	dw_hdmi_poweron(hdmi);
 	dw_hdmi_update_phy_mask(hdmi);
 	handle_plugged_change(hdmi, true);
 	mutex_unlock(&hdmi->mutex);
@@ -3072,7 +3044,6 @@ void dw_hdmi_setup_rx_sense(struct dw_hdmi *hdmi, bool hpd, bool rx_sense)
 		if (hpd)
 			hdmi->rxsense = true;
 
-		dw_hdmi_update_power(hdmi);
 		dw_hdmi_update_phy_mask(hdmi);
 	}
 	mutex_unlock(&hdmi->mutex);
-- 
2.46.0