linux-kernel - [PATCH 55/60] drm/st7735r: Add support for the nomodeset kernel parameter

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Date:   Wed, 15 Dec 2021 02:00:03 +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>,
        David Lechner <david@...hnology.com>
Subject: [PATCH 55/60] drm/st7735r: 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/tiny/st7735r.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/tiny/st7735r.c b/drivers/gpu/drm/tiny/st7735r.c
index fc40dd10efa8..841ec1c7bb93 100644
--- a/drivers/gpu/drm/tiny/st7735r.c
+++ b/drivers/gpu/drm/tiny/st7735r.c
@@ -190,6 +190,9 @@ static int st7735r_probe(struct spi_device *spi)
 	u32 rotation = 0;
 	int ret;
 
+	if (drm_firmware_drivers_only())
+		return -ENODEV;
+
 	cfg = device_get_match_data(&spi->dev);
 	if (!cfg)
 		cfg = (void *)spi_get_device_id(spi)->driver_data;
-- 
2.33.1