drm/nouveau/disp: Always accept linear modifier

commit e2fe0c5 upstream.

On some chipsets, which block-linear modifiers are
supported is format-specific. However, linear
modifiers are always be supported. The prior
modifier filtering logic was not accounting for
the linear case.

Cc: [email protected]
Fixes: c586f30 ("drm/nouveau/kms: Add format mod prop to base/ovly/nvdisp")
Signed-off-by: James Jones <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Danilo Krummrich <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: cubanismo

drivers/gpu/drm/nouveau/dispnv50/wndw.c

@@ -795,6 +795,10 @@ static bool nv50_plane_format_mod_supported(struct drm_plane *plane,
 	struct nouveau_drm *drm = nouveau_drm(plane->dev);
 	uint8_t i;
 
+	/* All chipsets can display all formats in linear layout */
+	if (modifier == DRM_FORMAT_MOD_LINEAR)
+		return true;
+
 	if (drm->client.device.info.chipset < 0xc0) {
 		const struct drm_format_info *info = drm_format_info(format);
 		const uint8_t kind = (modifier >> 12) & 0xff;