linux-kernel - [PATCH 17/60] drm/imx: Add support for the nomodeset kernel parameter

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Message-Id: <20211215010008.2545520-18-javierm@redhat.com>
Date:   Wed, 15 Dec 2021 01:59:25 +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>,
        Philipp Zabel <p.zabel@...gutronix.de>
Subject: [PATCH 17/60] drm/imx: 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/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);
-- 
2.33.1