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linux/drivers/gpu/drm/udl
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Takashi Iwai fc0f921b7e drm/udl: Restore display mode on resume 
commit 6d6e732835 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: 997d33c356 ("drm/udl: Inline DPMS code into CRTC enable and disable functions")
Cc: <stable@vger.kernel.org>
Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220908095115.23396-2-tiwai@suse.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2022-10-26 12:34:24 +02:00
..
Kconfig drm/udl: Make udl driver depend on CONFIG_USB 2020-01-09 15:02:48 +01:00
Makefile drm/udl: Use GEM vmap/mmap function from SHMEM helpers 2020-06-10 10:17:21 +02:00
udl_connector.c drm/udl: fix control-message timeout 2021-11-25 09:49:05 +01:00
udl_connector.h drm/udl: drop use of drmP.h 2019-07-17 12:52:55 +02:00
udl_drv.c drm: Use USB controller's DMA mask when importing dmabufs 2021-03-11 11:11:33 +01:00
udl_drv.h drm: Use USB controller's DMA mask when importing dmabufs 2021-03-11 11:11:33 +01:00
udl_main.c drm: Use USB controller's DMA mask when importing dmabufs 2021-03-11 11:11:33 +01:00
udl_modeset.c drm/udl: Restore display mode on resume 2022-10-26 12:34:24 +02:00
udl_transfer.c drm/udl: Remove field lost_pixels from struct udl_device 2019-12-06 13:52:33 +01:00