linux-kernel - [PATCH 57/60] drm/udl: Add support for the nomodeset kernel parameter

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Message-Id: <20211215010008.2545520-58-javierm@redhat.com>
Date:   Wed, 15 Dec 2021 02:00:05 +0100
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Cc:     Javier Martinez Canillas <javierm@...hat.com>,
        Sean Paul <sean@...rly.run>,
        Thomas Zimmermann <tzimmermann@...e.de>
Subject: [PATCH 57/60] drm/udl: Add support for the nomodeset kernel parameter

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 systewm 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@...hat.com>
---

 drivers/gpu/drm/udl/udl_drv.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/udl/udl_drv.c b/drivers/gpu/drm/udl/udl_drv.c
index 5703277c6f52..d5a0aa762ec8 100644
--- a/drivers/gpu/drm/udl/udl_drv.c
+++ b/drivers/gpu/drm/udl/udl_drv.c
@@ -91,6 +91,9 @@ static int udl_usb_probe(struct usb_interface *interface,
 	int r;
 	struct udl_device *udl;
 
+	if (drm_firmware_drivers_only())
+		return -ENODEV;
+
 	udl = udl_driver_create(interface);
 	if (IS_ERR(udl))
 		return PTR_ERR(udl);
-- 
2.33.1