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

[Thomas Zimmermann]

Hi,

oh great! Thank you for fixing this bug. And sorry that I broke it.

Am 10.05.23 um 10:54 schrieb 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>

Also needs:

Cc: <stable at vger.kernel.org> # v6.1+

In terms of what it does:

Reviewed-by: Thomas Zimmermann <tzimmermann at suse.de>

but the patch is apparently for against an old version. (v6.1?) The code 
in mgag200_crtc_helper_atomic_enable has changed quite a bit.

Best regards
Thomas

> ---
>   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

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)
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