linux-kernel - [PATCH 09/60] drm/fsl-dcu: Add support for the nomodeset kernel parameter

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Message-Id: <20211215010008.2545520-10-javierm@redhat.com>
Date:   Wed, 15 Dec 2021 01:59:17 +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>,
        Alison Wang <alison.wang@....com>,
        Stefan Agner <stefan@...er.ch>
Subject: [PATCH 09/60] drm/fsl-dcu: 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/fsl-dcu/fsl_dcu_drm_drv.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
index 660fe573db96..9b9e1b200005 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
@@ -255,6 +255,9 @@ static int fsl_dcu_drm_probe(struct platform_device *pdev)
 	int ret;
 	u8 div_ratio_shift = 0;
 
+	if (drm_firmware_drivers_only())
+		return -ENODEV;
+
 	fsl_dev = devm_kzalloc(dev, sizeof(*fsl_dev), GFP_KERNEL);
 	if (!fsl_dev)
 		return -ENOMEM;
-- 
2.33.1