linux-kernel - [PATCH 45/60] drm/arc: Add support for the nomodeset kernel parameter

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Message-Id: <20211215010008.2545520-46-javierm@redhat.com>
Date:   Wed, 15 Dec 2021 01:59:53 +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>,
        Alexey Brodkin <abrodkin@...opsys.com>
Subject: [PATCH 45/60] drm/arc: 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/tiny/arcpgu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/tiny/arcpgu.c b/drivers/gpu/drm/tiny/arcpgu.c
index f8531c50a072..9268f37762c8 100644
--- a/drivers/gpu/drm/tiny/arcpgu.c
+++ b/drivers/gpu/drm/tiny/arcpgu.c
@@ -378,6 +378,9 @@ static int arcpgu_probe(struct platform_device *pdev)
 	struct arcpgu_drm_private *arcpgu;
 	int ret;
 
+	if (drm_firmware_drivers_only())
+		return -ENODEV;
+
 	arcpgu = devm_drm_dev_alloc(&pdev->dev, &arcpgu_drm_driver,
 				    struct arcpgu_drm_private, drm);
 	if (IS_ERR(arcpgu))
-- 
2.33.1