From f0a5da8db56881bce68357ee90db2b56dcd4abc8 Mon Sep 17 00:00:00 2001
From: Javier Martinez Canillas <javierm@redhat.com>
Date: Fri, 17 Dec 2021 01:37:50 +0100
Subject: drm/tegra: Add support for the nomodeset kernel parameter
Git-commit: 93804f5d2dd2f9c1b7f45fe630a2f5302ae0dcfb
Patch-mainline: v5.18-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
According to disable Documentation/admin-guide/kernel-parameters.txt, this
parameter can be used to disable kernel modesetting.
DRM drivers will not perform display-mode changes or accelerated rendering
and only the system framebuffer will be available if it was set-up.
But only a few DRM drivers currently check for nomodeset, make this driver
to also support the command line parameter.
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20211217003752.3946210-36-javierm@redhat.com
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/tegra/drm.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index e9de91a4e7e8..9464f522e257 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -1410,6 +1410,9 @@ static int __init host1x_drm_init(void)
{
int err;
+ if (drm_firmware_drivers_only())
+ return -ENODEV;
+
err = host1x_driver_register(&host1x_drm_driver);
if (err < 0)
return err;
--
2.38.1