linux-kernel - [PATCH 25/60] drm/msm: Add support for the nomodeset kernel parameter

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Date:   Wed, 15 Dec 2021 01:59:33 +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>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>
Subject: [PATCH 25/60] drm/msm: 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/msm/msm_drv.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 7936e8d498dd..eb098475224b 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -518,6 +518,9 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
 	struct msm_mdss *mdss;
 	int ret, i;
 
+	if (drm_firmware_drivers_only())
+		return -ENODEV;
+
 	ddev = drm_dev_alloc(drv, dev);
 	if (IS_ERR(ddev)) {
 		DRM_DEV_ERROR(dev, "failed to allocate drm_device\n");
-- 
2.33.1