linux-kernel - [PATCH 35/60] drm/shmobile: Add support for the nomodeset kernel parameter

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Date:   Wed, 15 Dec 2021 01:59:43 +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>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: [PATCH 35/60] drm/shmobile: 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/shmobile/shmob_drm_drv.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/shmobile/shmob_drm_drv.c b/drivers/gpu/drm/shmobile/shmob_drm_drv.c
index 80078a9fd7f6..7011c659a921 100644
--- a/drivers/gpu/drm/shmobile/shmob_drm_drv.c
+++ b/drivers/gpu/drm/shmobile/shmob_drm_drv.c
@@ -195,6 +195,9 @@ static int shmob_drm_probe(struct platform_device *pdev)
 	unsigned int i;
 	int ret;
 
+	if (drm_firmware_drivers_only())
+		return -ENODEV;
+
 	if (pdata == NULL) {
 		dev_err(&pdev->dev, "no platform data\n");
 		return -EINVAL;
-- 
2.33.1