From: Boris Brezillon <boris.brezillon@collabora.com>
To: dri-devel@lists.freedesktop.org
Cc: Lucas Stach <l.stach@pengutronix.de>,
Chris Healy <cphealy@gmail.com>,
Andrey Smirnov <andrew.smirnov@gmail.com>,
Nikita Yushchenko <nikita.yoush@cogentembedded.com>,
kernel@collabora.com, Daniel Vetter <daniel@ffwll.ch>,
Inki Dae <inki.dae@samsung.com>,
Joonyoung Shim <jy0922.shim@samsung.com>,
Seung-Woo Kim <sw0312.kim@samsung.com>,
Kyungmin Park <kyungmin.park@samsung.com>,
Thierry Reding <thierry.reding@gmail.com>,
Sam Ravnborg <sam@ravnborg.org>,
Philipp Zabel <p.zabel@pengutronix.de>,
Rob Clark <robdclark@gmail.com>,
Andrzej Hajda <a.hajda@samsung.com>,
Neil Armstrong <narmstrong@baylibre.com>,
Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
Jonas Karlman <jonas@kwiboo.se>,
Jernej Skrabec <jernej.skrabec@siol.net>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
devicetree@vger.kernel.org, Eric Anholt <eric@anholt.net>,
Boris Brezillon <boris.brezillon@collabora.com>,
Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Subject: [PATCH v4 06/11] drm/bridge: Add the drm_bridge_get_prev_bridge() helper
Date: Tue, 3 Dec 2019 15:15:10 +0100 [thread overview]
Message-ID: <20191203141515.3597631-7-boris.brezillon@collabora.com> (raw)
In-Reply-To: <20191203141515.3597631-1-boris.brezillon@collabora.com>
The drm_bridge_get_prev_bridge() helper will be useful for bridge
drivers that want to do bus format negotiation with their neighbours.
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
---
Changes in v4:
* Change the helper name to be consistent with the _next_bridge() helper
* Update the commit message
* Add Rbs
Changes in v3:
* Inline drm_bridge_chain_get_prev_bridge()
* Fix the doc
Changes in v2:
* Fix the kerneldoc
* Drop the !bridge || !bridge->encoder check
---
include/drm/drm_bridge.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 1eb854025a20..bfb0385163f1 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -426,6 +426,22 @@ drm_bridge_get_next_bridge(struct drm_bridge *bridge)
return list_next_entry(bridge, chain_node);
}
+/**
+ * drm_bridge_get_prev_bridge() - Get the previous bridge in the chain
+ * @bridge: bridge object
+ *
+ * RETURNS:
+ * the previous bridge in the chain, or NULL if @bridge is the first.
+ */
+static inline struct drm_bridge *
+drm_bridge_get_prev_bridge(struct drm_bridge *bridge)
+{
+ if (list_is_first(&bridge->chain_node, &bridge->encoder->bridge_chain))
+ return NULL;
+
+ return list_prev_entry(bridge, chain_node);
+}
+
/**
* drm_bridge_chain_get_first_bridge() - Get the first bridge in the chain
* @encoder: encoder object
--
2.23.0
next prev parent reply other threads:[~2019-12-03 14:15 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-03 14:15 [PATCH v4 00/11] drm: Add support for bus-format negotiation Boris Brezillon
2019-12-03 14:15 ` [PATCH v4 01/11] drm/bridge: Rename bridge helpers targeting a bridge chain Boris Brezillon
2019-12-03 14:15 ` [PATCH v4 02/11] drm/bridge: Introduce drm_bridge_get_next_bridge() Boris Brezillon
2019-12-03 14:15 ` [PATCH v4 03/11] drm: Stop accessing encoder->bridge directly Boris Brezillon
2019-12-03 14:15 ` [PATCH v4 04/11] drm/bridge: Make the bridge chain a double-linked list Boris Brezillon
2019-12-16 13:54 ` Marek Szyprowski
2019-12-16 14:55 ` Boris Brezillon
2019-12-16 15:02 ` Marek Szyprowski
2019-12-16 15:25 ` Boris Brezillon
2019-12-23 9:55 ` Marek Szyprowski
2019-12-24 9:16 ` Andrzej Hajda
2019-12-24 9:44 ` Boris Brezillon
2019-12-24 9:49 ` Boris Brezillon
2019-12-24 10:03 ` Boris Brezillon
2019-12-27 10:25 ` Marek Szyprowski
2019-12-27 11:03 ` Marek Szyprowski
2019-12-24 11:31 ` Sam Ravnborg
2019-12-25 1:36 ` Laurent Pinchart
2019-12-27 12:39 ` Boris Brezillon
2019-12-27 9:42 ` Andrzej Hajda
2019-12-27 10:51 ` Laurent Pinchart
2019-12-27 12:21 ` Boris Brezillon
2020-01-01 17:13 ` Laurent Pinchart
2019-12-03 14:15 ` [PATCH v4 05/11] drm/bridge: Add the drm_for_each_bridge_in_chain() helper Boris Brezillon
2019-12-03 14:15 ` Boris Brezillon [this message]
2019-12-03 14:15 ` [PATCH v4 07/11] drm/bridge: Clarify the atomic enable/disable hooks semantics Boris Brezillon
2019-12-03 18:02 ` Laurent Pinchart
2019-12-04 9:00 ` Boris Brezillon
2019-12-03 14:15 ` [PATCH v4 08/11] drm/bridge: Add a drm_bridge_state object Boris Brezillon
2019-12-03 18:17 ` Laurent Pinchart
2019-12-04 9:03 ` Boris Brezillon
2019-12-04 9:12 ` Laurent Pinchart
2019-12-04 9:42 ` Boris Brezillon
2019-12-04 10:38 ` Laurent Pinchart
2019-12-03 14:15 ` [PATCH v4 09/11] drm/bridge: Patch atomic hooks to take a drm_bridge_state Boris Brezillon
2019-12-03 14:15 ` [PATCH v4 10/11] drm/bridge: Add an ->atomic_check() hook Boris Brezillon
2019-12-03 14:15 ` [PATCH v4 11/11] drm/bridge: Add the necessary bits to support bus format negotiation Boris Brezillon
2019-12-03 18:19 ` [PATCH v4 00/11] drm: Add support for bus-format negotiation Laurent Pinchart
2019-12-04 9:09 ` Boris Brezillon
2019-12-04 9:15 ` Laurent Pinchart
2019-12-04 13:43 ` Neil Armstrong
2019-12-09 9:43 ` Boris Brezillon
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