[PATCH] drm/mgag200: Fix gamma lut not initialized.

[Jocelyn Falempe]

When mgag200 switched from simple KMS to regular atomic helpers,
the initialization of the gamma settings was lost.
This leads to a black screen, if the bios/uefi doesn't use the same
pixel color depth.

Link: https://bugzilla.redhat.com/show_bug.cgi?id=2171155
Fixes: 1baf9127c482 ("drm/mgag200: Replace simple-KMS with regular atomic helpers")
Tested-by: Phil Oester <kernel at linuxace.com>
Signed-off-by: Jocelyn Falempe <jfalempe at redhat.com>
---
 drivers/gpu/drm/mgag200/mgag200_mode.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c
index 461da1409fdf..911d46741e40 100644
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
@@ -819,6 +819,11 @@ static void mgag200_crtc_helper_atomic_enable(struct drm_crtc *crtc,
 	else if (mdev->type == G200_EV)
 		mgag200_g200ev_set_hiprilvl(mdev);
 
+	if (crtc_state->gamma_lut)
+		mgag200_crtc_set_gamma(mdev, format, crtc_state->gamma_lut->data);
+	else
+		mgag200_crtc_set_gamma_linear(mdev, format);
+
 	mgag200_enable_display(mdev);
 
 	if (mdev->type == G200_WB || mdev->type == G200_EW3)

base-commit: 1baf9127c482a3a58aef81d92ae751798e2db202
-- 
2.39.2