linux-kernel - [PATCH 4.12 189/196] drm/imx: parallel-display: Accept drm_of_find_panel_or

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Message-Id: <20170725192055.204841426@linuxfoundation.org>
Date:   Tue, 25 Jul 2017 12:23:08 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Nikita Yushchenko <nikita.yoush@...entembedded.com>,
        Chris Healy <cphealy@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>
Subject: [PATCH 4.12 189/196] drm/imx: parallel-display: Accept drm_of_find_panel_or_bridge failure

4.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Philipp Zabel <p.zabel@...gutronix.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@...entembedded.com>
Fixes: ebc944613567 ("drm: convert drivers to use drm_of_find_panel_or_bridge")
Tested-by: Chris Healy <cphealy@...il.com>
Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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;