This is a note to let you know that I've just added the patch titled
drm/imx: parallel-display: Accept drm_of_find_panel_or_bridge failure
to the 4.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-imx-parallel-display-accept-drm_of_find_panel_or_bridge-failure.patch
and it can be found in the queue-4.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 799ee2970485dc206c3bf347d6e6827c04d5e4f9 Mon Sep 17 00:00:00 2001
From: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
Date: Mon, 12 Jun 2017 17:54:29 +0200
Subject: drm/imx: parallel-display: Accept drm_of_find_panel_or_bridge failure
From: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
commit 799ee2970485dc206c3bf347d6e6827c04d5e4f9 upstream.
The parallel panel driver should continue to work without having an
endpoint linking to an panel in DT for backwards compatibility.
With the recent switch to drm_of_find_panel_or_bridge, an absent
panel results in a failure with -ENODEV error return code. To restore
the old behaviour, ignore the -ENODEV return code.
Reported-by: Nikita Yushchenko <nikita.yoush@xxxxxxxxxxxxxxxxxx>
Fixes: ebc944613567 ("drm: convert drivers to use drm_of_find_panel_or_bridge")
Tested-by: Chris Healy <cphealy@xxxxxxxxx>
Signed-off-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/imx/parallel-display.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/imx/parallel-display.c
+++ b/drivers/gpu/drm/imx/parallel-display.c
@@ -237,7 +237,7 @@ static int imx_pd_bind(struct device *de
/* port@1 is the output port */
ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel, &imxpd->bridge);
- if (ret)
+ if (ret && ret != -ENODEV)
return ret;
imxpd->dev = dev;
Patches currently in stable-queue which might be from p.zabel@xxxxxxxxxxxxxx are
queue-4.12/drm-imx-parallel-display-accept-drm_of_find_panel_or_bridge-failure.patch