linux-kernel - [PATCH 07/60] drm/etnaviv: Add support for the nomodeset kernel parameter

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Message-Id: <20211215010008.2545520-8-javierm@redhat.com>
Date:   Wed, 15 Dec 2021 01:59:15 +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>,
        Lucas Stach <l.stach@...gutronix.de>,
        Russell King <linux+etnaviv@...linux.org.uk>
Subject: [PATCH 07/60] drm/etnaviv: 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/etnaviv/etnaviv_drv.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_drv.c b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
index 7dcc6392792d..58b092248f7b 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_drv.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
@@ -635,6 +635,9 @@ static int __init etnaviv_init(void)
 	int ret;
 	struct device_node *np;
 
+	if (drm_firmware_drivers_only())
+		return -ENODEV;
+
 	etnaviv_validate_init();
 
 	ret = platform_driver_register(&etnaviv_gpu_driver);
-- 
2.33.1