linux-kernel - [PATCH 2/2] drm/ofdrm: Update expected device name

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Message-Id: <20230412095509.2196162-3-cyril@debamax.com>
Date:   Wed, 12 Apr 2023 11:55:09 +0200
From:   Cyril Brulebois <cyril@...amax.com>
To:     linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org
Cc:     Thomas Zimmermann <tzimmermann@...e.de>,
        Rob Herring <robh@...nel.org>,
        Michal Suchanek <msuchanek@...e.de>,
        linux-kernel@...r.kernel.org, Cyril Brulebois <cyril@...amax.com>,
        stable@...r.kernel.org
Subject: [PATCH 2/2] drm/ofdrm: Update expected device name

Since commit 241d2fb56a18 ("of: Make OF framebuffer device names unique"),
as spotted by Frédéric Bonnard, the historical "of-display" device is
gone: the updated logic creates "of-display.0" instead, then as many
"of-display.N" as required.

This means that offb no longer finds the expected device, which prevents
the Debian Installer from setting up its interface, at least on ppc64el.

Given the code similarity it is likely to affect ofdrm in the same way.

It might be better to iterate on all possible nodes, but updating the
hardcoded device from "of-display" to "of-display.0" is likely to help
as a first step.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=217328
Link: https://bugs.debian.org/1033058
Fixes: 241d2fb56a18 ("of: Make OF framebuffer device names unique")
Cc: stable@...r.kernel.org # v6.2+
Signed-off-by: Cyril Brulebois <cyril@...amax.com>
---
 drivers/gpu/drm/tiny/ofdrm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tiny/ofdrm.c b/drivers/gpu/drm/tiny/ofdrm.c
index 6e349ca42485..92df021d71df 100644
--- a/drivers/gpu/drm/tiny/ofdrm.c
+++ b/drivers/gpu/drm/tiny/ofdrm.c
@@ -1390,7 +1390,7 @@ MODULE_DEVICE_TABLE(of, ofdrm_of_match_display);

 static struct platform_driver ofdrm_platform_driver = {
 	.driver = {
-		.name = "of-display",
+		.name = "of-display.0",
 		.of_match_table = ofdrm_of_match_display,
 	},
 	.probe = ofdrm_probe,
-- 
2.30.2