linux-kernel - [PATCH 16/60] drm/imx/dcss: Add support for the nomodeset kernel parameter

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Message-Id: <20211215010008.2545520-17-javierm@redhat.com>
Date:   Wed, 15 Dec 2021 01:59:24 +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>,
        Laurentiu Palcu <laurentiu.palcu@....nxp.com>,
        Lucas Stach <l.stach@...gutronix.de>
Subject: [PATCH 16/60] drm/imx/dcss: 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/dcss/dcss-drv.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/imx/dcss/dcss-drv.c b/drivers/gpu/drm/imx/dcss/dcss-drv.c
index 8dc2f85c514b..5be591da7389 100644
--- a/drivers/gpu/drm/imx/dcss/dcss-drv.c
+++ b/drivers/gpu/drm/imx/dcss/dcss-drv.c
@@ -38,6 +38,9 @@ static int dcss_drv_platform_probe(struct platform_device *pdev)
 	int err = 0;
 	bool hdmi_output = true;
 
+	if (drm_firmware_drivers_only())
+		return -ENODEV;
+
 	if (!dev->of_node)
 		return -ENODEV;
 
-- 
2.33.1