Patch "drm/imx: parallel-display: Accept drm_of_find_panel_or_bridge failure" has been added to the 4.12-stable tree

Patch "drm/imx: parallel-display: Accept drm_of_find_panel_or_bridge failure" has been added to the 4.12-stable tree

[gregkh]

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@vger.kernel.org> know about it.


>From 799ee2970485dc206c3bf347d6e6827c04d5e4f9 Mon Sep 17 00:00:00 2001
From: Philipp Zabel <p.zabel@pengutronix.de>
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@pengutronix.de>

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@cogentembedded.com>
Fixes: ebc944613567 ("drm: convert drivers to use drm_of_find_panel_or_bridge")
Tested-by: Chris Healy <cphealy@gmail.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 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@pengutronix.de are

queue-4.12/drm-imx-parallel-display-accept-drm_of_find_panel_or_bridge-failure.patch