[53/60] drm/repaper: Add support for the nomodeset kernel parameter

Commit Message

Javier Martinez Canillas Dec. 15, 2021, 1 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/tiny/repaper.c | 3 +++
 1 file changed, 3 insertions(+)

Comments

Noralf Trønnes Dec. 16, 2021, 3:48 p.m. UTC | #1

Den 15.12.2021 02.00, skrev Javier Martinez Canillas:
> 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]>
> ---

Acked-by: Noralf Trønnes <[e-mail]>

Patch

diff --git a/drivers/gpu/drm/tiny/repaper.c b/drivers/gpu/drm/tiny/repaper.c
index 97a775c48cea..ea97b8c06157 100644
--- a/drivers/gpu/drm/tiny/repaper.c
+++ b/drivers/gpu/drm/tiny/repaper.c
@@ -968,6 +968,9 @@  static int repaper_probe(struct spi_device *spi)
 	const void *match;
 	int ret;
 
+	if (drm_firmware_drivers_only())
+		return -ENODEV;
+
 	match = device_get_match_data(dev);
 	if (match) {
 		model = (enum repaper_model)match;