linux-kernel - [PATCH 31/60] drm/r128: Add support for the nomodeset kernel parameter

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Date:   Wed, 15 Dec 2021 01:59:39 +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>
Subject: [PATCH 31/60] drm/r128: 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/r128/r128_drv.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/r128/r128_drv.c b/drivers/gpu/drm/r128/r128_drv.c
index e35a3a1449bd..e49db9692df9 100644
--- a/drivers/gpu/drm/r128/r128_drv.c
+++ b/drivers/gpu/drm/r128/r128_drv.c
@@ -98,6 +98,9 @@ static struct pci_driver r128_pci_driver = {

 static int __init r128_init(void)
 {
+	if (drm_firmware_drivers_only())
+		return -ENODEV;
+
 	driver.num_ioctls = r128_max_ioctl;

 	return drm_legacy_pci_init(&driver, &r128_pci_driver);
-- 
2.33.1