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backend/drm: add env variable to disable modifiers 

In some cases modesets fail if the planes are initialized with
modifiers. Since in this case possibly all planes need to reinitialized,
which is not possible in the current wlroots design, add an environment
variable for affected users.
This commit is contained in:
Rouven Czerwinski 2020-01-24 19:31:39 +01:00 committed by Simon Ser
parent 1f722f5c80
commit f0594fb732
2 changed files with 26 additions and 4 deletions
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28
backend/drm/drm.c
View File

@ -603,21 +603,41 @@ static bool drm_connector_init_renderer(struct wlr_drm_connector *conn,
int height = mode->wlr_mode.height;
uint32_t format = drm->renderer.gbm_format;
if (!init_drm_plane_surfaces(plane, drm, width, height, format, true) ||
bool modifiers = true;
const char *no_modifiers = getenv("WLR_DRM_NO_MODIFIERS");
if (no_modifiers != NULL && strcmp(no_modifiers, "1") == 0) {
wlr_log(WLR_DEBUG,
"WLR_DRM_NO_MODIFIERS set, initializing planes without modifiers");
modifiers = false;
}
if (!init_drm_plane_surfaces(plane, drm, width, height, format, modifiers) ||
!drm_connector_pageflip_renderer(conn, mode)) {
// If page-flipping with modifiers enabled doesn't work, retry without
// modifiers
wlr_log(WLR_INFO, "Page-flip failed with primary FB modifiers enabled, "
"retrying without modifiers");
finish_drm_surface(&plane->surf);
finish_drm_surface(&plane->mgpu_surf);
if (!init_drm_plane_surfaces(plane, drm, width, height, format, false)) {
if (!modifiers) {
wlr_log(WLR_ERROR, "Failed to initialize renderer "
"on connector '%s': initial page-flip failed",
conn->output.name);
return false;
}
wlr_log(WLR_INFO, "Page-flip failed with primary FB modifiers enabled, "
"retrying without modifiers");
modifiers = false;
if (!init_drm_plane_surfaces(plane, drm, width, height, format,
modifiers)) {
return false;
}
if (!drm_connector_pageflip_renderer(conn, mode)) {
wlr_log(WLR_ERROR, "Failed to initialize renderer "
"on connector '%s': initial page-flip failed",
conn->output.name);
finish_drm_surface(&plane->surf);
finish_drm_surface(&plane->mgpu_surf);
return false;
}
}

2
docs/env_vars.md
View File

@ -17,6 +17,8 @@ wlroots reads these environment variables
considered the primary DRM device.
* *WLR_DRM_NO_ATOMIC*: set to 1 to use legacy DRM interface instead of atomic
mode setting
* *WLR_DRM_NO_MODIFIERS*: set to 1 to always allocate planes without modifiers,
this can fix certain modeset failures because of bandwidth restrictions.
## Headless backend