From 0a129790893b765bef4ba02fcdeb73cbc56d5b99 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Thu, 8 Sep 2022 11:51:04 +0200 Subject: [PATCH] drm/udl: Restore display mode on resume commit 6d6e732835db92e66c28dbcf258a7e3d3c71420d upstream. Restore the display mode whne resuming from suspend. Currently, the display remains dark. On resume, the CRTC's mode does not change, but the 'active' flag changes to 'true'. Taking this into account when considering a mode switch restores the display mode. The bug is reproducable by using Gnome with udl and observing the adapter's suspend/resume behavior. Actually, the whole check added in udl_simple_display_pipe_enable() about the crtc_state->mode_changed was bogus. We should drop the whole check and always apply the mode change in this function. [ tiwai -- Drop the mode_changed check entirely instead, per Daniel's suggestion ] Fixes: 997d33c35618 ("drm/udl: Inline DPMS code into CRTC enable and disable functions") Cc: Suggested-by: Daniel Vetter Reviewed-by: Daniel Vetter Signed-off-by: Takashi Iwai Signed-off-by: Thomas Zimmermann Link: https://patchwork.freedesktop.org/patch/msgid/20220908095115.23396-2-tiwai@suse.de Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/udl/udl_modeset.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/drivers/gpu/drm/udl/udl_modeset.c b/drivers/gpu/drm/udl/udl_modeset.c index edcfd8c120c4..209b5ceba3e0 100644 --- a/drivers/gpu/drm/udl/udl_modeset.c +++ b/drivers/gpu/drm/udl/udl_modeset.c @@ -400,9 +400,6 @@ udl_simple_display_pipe_enable(struct drm_simple_display_pipe *pipe, udl_handle_damage(fb, 0, 0, fb->width, fb->height); - if (!crtc_state->mode_changed) - return; - /* enable display */ udl_crtc_write_mode_to_hw(crtc); }