From:   Javier Martinez Canillas <javierm@redhat.com>
To:     linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org
Cc:     Javier Martinez Canillas <javierm@redhat.com>
Subject: [PATCH 48/60] drm/ili9163: Add support for the nomodeset kernel parameter
Date:   Wed, 15 Dec 2021 01:59:56 +0100
Message-Id: <20211215010008.2545520-49-javierm@redhat.com>
In-Reply-To: <20211215010008.2545520-1-javierm@redhat.com>
References: <20211215010008.2545520-1-javierm@redhat.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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@redhat.com>
---

 drivers/gpu/drm/tiny/ili9163.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/tiny/ili9163.c b/drivers/gpu/drm/tiny/ili9163.c
index bcc181351236..60afabc6bb35 100644
--- a/drivers/gpu/drm/tiny/ili9163.c
+++ b/drivers/gpu/drm/tiny/ili9163.c
@@ -146,6 +146,9 @@ static int ili9163_probe(struct spi_device *spi)
 	u32 rotation = 0;
 	int ret;
 
+	if (drm_firmware_drivers_only())
+		return -ENODEV;
+
 	dbidev = devm_drm_dev_alloc(dev, &ili9163_driver,
 				    struct mipi_dbi_dev, drm);
 	if (IS_ERR(dbidev))
-- 
2.33.1