linux-kernel - [PATCH v2 17/22] media: au0828 disable tuner to demod link

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Message-Id: <ce0a0d11f4ebe26b7d7ff7011cf98c4b64892905.1454557589.git.shuahkh@osg.samsung.com>
Date:	Wed,  3 Feb 2016 21:03:49 -0700
From:	Shuah Khan <shuahkh@....samsung.com>
To:	mchehab@....samsung.com, tiwai@...e.com, clemens@...isch.de,
	hans.verkuil@...co.com, laurent.pinchart@...asonboard.com,
	sakari.ailus@...ux.intel.com, javier@....samsung.com
Cc:	Shuah Khan <shuahkh@....samsung.com>, pawel@...iak.com,
	m.szyprowski@...sung.com, kyungmin.park@...sung.com,
	perex@...ex.cz, arnd@...db.de, dan.carpenter@...cle.com,
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Subject: [PATCH v2 17/22] media: au0828 disable tuner to demod link

Change au0828_create_media_graph() to find and disable
tuner and demod link. This helps avoid an additional
disable step when tuner is requested by video or audio.

Signed-off-by: Shuah Khan <shuahkh@....samsung.com>
---
 drivers/media/usb/au0828/au0828-core.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/media/usb/au0828/au0828-core.c b/drivers/media/usb/au0828/au0828-core.c
index 868babe..b02a122 100644
--- a/drivers/media/usb/au0828/au0828-core.c
+++ b/drivers/media/usb/au0828/au0828-core.c
@@ -254,7 +254,7 @@ static int au0828_create_media_graph(struct au0828_dev *dev)
 #ifdef CONFIG_MEDIA_CONTROLLER
 	struct media_device *mdev = dev->media_dev;
 	struct media_entity *entity;
-	struct media_entity *tuner = NULL, *decoder = NULL;
+	struct media_entity *tuner = NULL, *decoder = NULL, *demod = NULL;
 	int i, ret;
 
 	if (!mdev)
@@ -268,6 +268,9 @@ static int au0828_create_media_graph(struct au0828_dev *dev)
 		case MEDIA_ENT_F_ATV_DECODER:
 			decoder = entity;
 			break;
+		case MEDIA_ENT_F_DTV_DEMOD:
+			demod = entity;
+			break;
 		}
 	}
 
@@ -322,6 +325,21 @@ static int au0828_create_media_graph(struct au0828_dev *dev)
 			break;
 		}
 	}
+
+	/*
+	 * Disable tuner to demod link to avoid disable step
+	 * when tuner is requested by video or audio
+	*/
+	if (tuner && demod) {
+		struct media_link *link;
+
+		list_for_each_entry(link, &demod->links, list) {
+			if (link->sink->entity == demod &&
+			    link->source->entity == tuner) {
+				media_entity_setup_link(link, 0);
+			}
+		}
+	}
 #endif
 	return 0;
 }
-- 
2.5.0