This is a note to let you know that I've just added the patch titled

drm/bridge: Fix lvds-encoder since the panel_bridge rework.

to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: drm-bridge-fix-lvds-encoder-since-the-panel_bridge-rework.patch and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Thu Feb 1 13:45:42 CET 2018

From: Eric Anholt eric@anholt.net Date: Tue, 14 Nov 2017 11:16:47 -0800 Subject: drm/bridge: Fix lvds-encoder since the panel_bridge rework.

From: Eric Anholt eric@anholt.net

[ Upstream commit dbb58bfd9ae6c885b2ca001a9a5ab8b881fb4ba9 ]

The panel_bridge bridge attaches to the panel's OF node, not the lvds-encoder's node. Put in a little no-op bridge of our own so that our consumers can still find a bridge where they expect.

This also fixes an unintended unregistration and leak of the panel-bridge on module remove.

Signed-off-by: Eric Anholt eric@anholt.net Fixes: 13dfc0540a57 ("drm/bridge: Refactor out the panel wrapper from the lvds-encoder bri dge.") Tested-by: Lothar Waßmann LW@KARO-electronics.de Signed-off-by: Archit Taneja architt@codeaurora.org Link: https://patchwork.freedesktop.org/patch/msgid/20171114191647.22207-1-eric@an...

Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/bridge/lvds-encoder.c | 48 +++++++++++++++++++++++++++++----- 1 file changed, 41 insertions(+), 7 deletions(-)

--- a/drivers/gpu/drm/bridge/lvds-encoder.c +++ b/drivers/gpu/drm/bridge/lvds-encoder.c @@ -13,13 +13,37 @@

#include <linux/of_graph.h>

+struct lvds_encoder { + struct drm_bridge bridge; + struct drm_bridge *panel_bridge; +}; + +static int lvds_encoder_attach(struct drm_bridge *bridge) +{ + struct lvds_encoder *lvds_encoder = container_of(bridge, + struct lvds_encoder, + bridge); + + return drm_bridge_attach(bridge->encoder, lvds_encoder->panel_bridge, + bridge); +} + +static struct drm_bridge_funcs funcs = { + .attach = lvds_encoder_attach, +}; + static int lvds_encoder_probe(struct platform_device *pdev) { struct device_node *port; struct device_node *endpoint; struct device_node *panel_node; struct drm_panel *panel; - struct drm_bridge *bridge; + struct lvds_encoder *lvds_encoder; + + lvds_encoder = devm_kzalloc(&pdev->dev, sizeof(*lvds_encoder), + GFP_KERNEL); + if (!lvds_encoder) + return -ENOMEM;

/* Locate the panel DT node. */ port = of_graph_get_port_by_id(pdev->dev.of_node, 1); @@ -49,20 +73,30 @@ static int lvds_encoder_probe(struct pla return -EPROBE_DEFER; }

- bridge = drm_panel_bridge_add(panel, DRM_MODE_CONNECTOR_LVDS); - if (IS_ERR(bridge)) - return PTR_ERR(bridge); + lvds_encoder->panel_bridge = + devm_drm_panel_bridge_add(&pdev->dev, + panel, DRM_MODE_CONNECTOR_LVDS); + if (IS_ERR(lvds_encoder->panel_bridge)) + return PTR_ERR(lvds_encoder->panel_bridge); + + /* The panel_bridge bridge is attached to the panel's of_node, + * but we need a bridge attached to our of_node for our user + * to look up. + */ + lvds_encoder->bridge.of_node = pdev->dev.of_node; + lvds_encoder->bridge.funcs = &funcs; + drm_bridge_add(&lvds_encoder->bridge);

- platform_set_drvdata(pdev, bridge); + platform_set_drvdata(pdev, lvds_encoder);

return 0; }

static int lvds_encoder_remove(struct platform_device *pdev) { - struct drm_bridge *bridge = platform_get_drvdata(pdev); + struct lvds_encoder *lvds_encoder = platform_get_drvdata(pdev);

- drm_bridge_remove(bridge); + drm_bridge_remove(&lvds_encoder->bridge);

return 0; }

Patches currently in stable-queue which might be from eric@anholt.net are

queue-4.14/drm-bridge-fix-lvds-encoder-since-the-panel_bridge-rework.patch queue-4.14/drm-vc4-move-irq-enable-to-pm-path.patch queue-4.14/drm-vc4-account-for-interrupts-in-flight.patch