linux-kernel - [PATCH 01/60] drm/komeda: Add support for the nomodeset kernel parameter

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Date:   Wed, 15 Dec 2021 01:59:09 +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>,
        "James (Qian) Wang" <james.qian.wang@....com>,
        Liviu Dudau <liviu.dudau@....com>
Subject: [PATCH 01/60] drm/komeda: 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/arm/display/komeda/komeda_drv.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_drv.c b/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
index e7933930a657..4f6d5c2103ec 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
@@ -9,6 +9,7 @@
 #include <linux/platform_device.h>
 #include <linux/component.h>
 #include <linux/pm_runtime.h>
+#include <drm/drm_drv.h>
 #include <drm/drm_of.h>
 #include "komeda_dev.h"
 #include "komeda_kms.h"
@@ -117,6 +118,9 @@ static int komeda_platform_probe(struct platform_device *pdev)
 	struct component_match *match = NULL;
 	struct device_node *child;
 
+	if (drm_firmware_drivers_only())
+		return -EINVAL;
+
 	if (!dev->of_node)
 		return -ENODEV;
 
-- 
2.33.1