linux-kernel - [PATCH v2 24/37] drm/hyperv: Add support for the nomodeset kernel parameter

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Message-Id: <20211217003752.3946210-25-javierm@redhat.com>
Date:   Fri, 17 Dec 2021 01:37:39 +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>,
        Deepak Rawat <drawat.floss@...il.com>
Subject: [PATCH v2 24/37] drm/hyperv: 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 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>
---

(no changes since v1)

 drivers/gpu/drm/hyperv/hyperv_drm_drv.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/hyperv/hyperv_drm_drv.c b/drivers/gpu/drm/hyperv/hyperv_drm_drv.c
index 00e53de4812b..4a8941fa0815 100644
--- a/drivers/gpu/drm/hyperv/hyperv_drm_drv.c
+++ b/drivers/gpu/drm/hyperv/hyperv_drm_drv.c
@@ -305,6 +305,9 @@ static int __init hyperv_init(void)
 {
 	int ret;
 
+	if (drm_firmware_drivers_only())
+		return -ENODEV;
+
 	ret = pci_register_driver(&hyperv_pci_driver);
 	if (ret != 0)
 		return ret;
-- 
2.33.1