linux-kernel - [PATCH 13/60] drm/hisilicon/kirin: Add support for the nomodeset kernel parameter

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Message-Id: <20211215010008.2545520-14-javierm@redhat.com>
Date:   Wed, 15 Dec 2021 01:59:21 +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>,
        Tian Tao <tiantao6@...ilicon.com>,
        Xinliang Liu <xinliang.liu@...aro.org>
Subject: [PATCH 13/60] drm/hisilicon/kirin: 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/hisilicon/kirin/kirin_drm_drv.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
index 98ae9a48f3fe..2f4c81dc8681 100644
--- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
+++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
@@ -274,6 +274,9 @@ static int kirin_drm_platform_probe(struct platform_device *pdev)
 	struct component_match *match = NULL;
 	struct device_node *remote;
 
+	if (drm_firmware_drivers_only())
+		return -ENODEV;
+
 	remote = of_graph_get_remote_node(np, 0, 0);
 	if (!remote)
 		return -ENODEV;
-- 
2.33.1