[26/60] drm: mxsfb: Add support for the nomodeset kernel parameter

Commit Message

Javier Martinez Canillas Dec. 15, 2021, 12:59 a.m. UTC

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 <[e-mail]>
---

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

Patch

diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
index 86d78634a979..1359fc99c6f0 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
@@ -342,6 +342,9 @@  static int mxsfb_probe(struct platform_device *pdev)
 			of_match_device(mxsfb_dt_ids, &pdev->dev);
 	int ret;
 
+	if (drm_firmware_drivers_only())
+		return -ENODEV;
+
 	if (!pdev->dev.of_node)
 		return -ENODEV;