linux-kernel - [PATCH 40/60] drm/sun4i: Add support for the nomodeset kernel parameter

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Message-Id: <20211215010008.2545520-41-javierm@redhat.com>
Date:   Wed, 15 Dec 2021 01:59:48 +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>,
        Chen-Yu Tsai <wens@...e.org>,
        Maxime Ripard <mripard@...nel.org>
Subject: [PATCH 40/60] drm/sun4i: 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/sun4i/sun4i_drv.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4i_drv.c
index b630614b3d72..174d3d7790e6 100644
--- a/drivers/gpu/drm/sun4i/sun4i_drv.c
+++ b/drivers/gpu/drm/sun4i/sun4i_drv.c
@@ -373,6 +373,9 @@ static int sun4i_drv_probe(struct platform_device *pdev)
 	struct endpoint_list list;
 	int i, ret, count = 0;
 
+	if (drm_firmware_drivers_only())
+		return -ENODEV;
+
 	INIT_KFIFO(list.fifo);
 
 	for (i = 0;; i++) {
-- 
2.33.1