linux-kernel - [PATCH v3 3/9] drm: xlnx: zynqmp_dpsub: Add connected live layer helper

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Message-ID: <20240321-dp-live-fmt-v3-3-d5090d796b7e@amd.com>
Date: Thu, 21 Mar 2024 13:43:41 -0700
From: Anatoliy Klymenko <anatoliy.klymenko@....com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>, Maarten Lankhorst
	<maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>, Michal Simek <michal.simek@....com>, Andrzej
 Hajda <andrzej.hajda@...el.com>, Neil Armstrong <neil.armstrong@...aro.org>,
	Robert Foss <rfoss@...nel.org>, Jonas Karlman <jonas@...boo.se>, Jernej
 Skrabec <jernej.skrabec@...il.com>, Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley
	<conor+dt@...nel.org>, Mauro Carvalho Chehab <mchehab@...nel.org>
CC: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
	<dri-devel@...ts.freedesktop.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-media@...r.kernel.org>, Anatoliy Klymenko <anatoliy.klymenko@....com>
Subject: [PATCH v3 3/9] drm: xlnx: zynqmp_dpsub: Add connected live layer
 helper

Add a helper function capturing the first connected live display layer
discovery logic.

Signed-off-by: Anatoliy Klymenko <anatoliy.klymenko@....com>
---
 drivers/gpu/drm/xlnx/zynqmp_dp.c | 37 +++++++++++++++++++++++--------------
 1 file changed, 23 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c
index 04b6bcac3b07..4faafdd76798 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_dp.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c
@@ -1276,28 +1276,40 @@ static void zynqmp_dp_encoder_mode_set_stream(struct zynqmp_dp *dp,
  * DISP Configuration
  */
 
+/**
+ * zynqmp_dp_disp_connected_live_layer - Return the first connected live layer
+ * @dp: DisplayPort IP core structure
+ *
+ * Return: The first connected live display layer or NULL if none of the live
+ * layer is connected.
+ */
+static struct zynqmp_disp_layer *
+zynqmp_dp_disp_connected_live_layer(struct zynqmp_dp *dp)
+{
+	if (dp->dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_VIDEO))
+		return dp->dpsub->layers[ZYNQMP_DPSUB_LAYER_VID];
+	else if (dp->dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_GFX))
+		return dp->dpsub->layers[ZYNQMP_DPSUB_LAYER_GFX];
+	else
+		return NULL;
+}
+
 static void zynqmp_dp_disp_enable(struct zynqmp_dp *dp,
 				  struct drm_bridge_state *old_bridge_state)
 {
-	enum zynqmp_dpsub_layer_id layer_id;
 	struct zynqmp_disp_layer *layer;
 	const struct drm_format_info *info;
 
-	if (dp->dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_VIDEO))
-		layer_id = ZYNQMP_DPSUB_LAYER_VID;
-	else if (dp->dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_GFX))
-		layer_id = ZYNQMP_DPSUB_LAYER_GFX;
-	else
+	layer = zynqmp_dp_disp_connected_live_layer(dp);
+	if (!layer)
 		return;
 
-	layer = dp->dpsub->layers[layer_id];
-
 	/* TODO: Make the format configurable. */
 	info = drm_format_info(DRM_FORMAT_YUV422);
 	zynqmp_disp_layer_set_format(layer, info);
 	zynqmp_disp_layer_enable(layer);
 
-	if (layer_id == ZYNQMP_DPSUB_LAYER_GFX)
+	if (layer == dp->dpsub->layers[ZYNQMP_DPSUB_LAYER_GFX])
 		zynqmp_disp_blend_set_global_alpha(dp->dpsub->disp, true, 255);
 	else
 		zynqmp_disp_blend_set_global_alpha(dp->dpsub->disp, false, 0);
@@ -1310,11 +1322,8 @@ static void zynqmp_dp_disp_disable(struct zynqmp_dp *dp,
 {
 	struct zynqmp_disp_layer *layer;
 
-	if (dp->dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_VIDEO))
-		layer = dp->dpsub->layers[ZYNQMP_DPSUB_LAYER_VID];
-	else if (dp->dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_GFX))
-		layer = dp->dpsub->layers[ZYNQMP_DPSUB_LAYER_GFX];
-	else
+	layer = zynqmp_dp_disp_connected_live_layer(dp);
+	if (!layer)
 		return;
 
 	zynqmp_disp_disable(dp->dpsub->disp);

-- 
2.25.1