From 15d47b2c69675d99f57e2a6a5f4599d09271c9db Mon Sep 17 00:00:00 2001
From: Javier Martinez Canillas <javierm@redhat.com>
Date: Fri, 17 Dec 2021 01:37:40 +0100
Subject: drm/imx: Add support for the nomodeset kernel parameter
Git-commit: 56dcbfd934ad57a46f2039c8c466a3c56293480a
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/20211217003752.3946210-26-javierm@redhat.com
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/imx/imx-drm-core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/imx/imx-drm-core.c b/drivers/gpu/drm/imx/imx-drm-core.c
index cb685fe2039b..a57812ec36b1 100644
--- a/drivers/gpu/drm/imx/imx-drm-core.c
+++ b/drivers/gpu/drm/imx/imx-drm-core.c
@@ -341,6 +341,9 @@ static struct platform_driver * const drivers[] = {
 
 static int __init imx_drm_init(void)
 {
+	if (drm_firmware_drivers_only())
+		return -ENODEV;
+
 	return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 }
 module_init(imx_drm_init);
-- 
2.38.1