drm/crtc: Introduce hw_reset helper hook

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The CRTC reset hook conflates initial software state allocation with
hardware reset. The atomic_create_state hook addresses the software
state side, but drivers may still need to reset hardware to a known good
state during drm_mode_config_reset(), for example during suspend/resume.

Separating hardware reset from state allocation is also useful for the
pending atomic state readout and userspace atomic reset flag series,
which need to create pristine software state without affecting the
hardware.

Introduce a hw_reset hook in struct drm_crtc_helper_funcs that only
resets the hardware, without touching the software state at all. Call it
from drm_mode_config_crtc_reset_with_create_state() after the state has
been successfully created.

Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://lore.kernel.org/r/20260904-drm-no-more-crtc-reset-v3-1-27d9891512ce@kernel.org
Signed-off-by: Maxime Ripard <mripard@kernel.org>

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Maxime Ripard 2026-09-04 11:07:19 +02:00

parent f2aaaa8c6c

commit 7e5d178cbc

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2 changed files with 26 additions and 1 deletions

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13

drivers/gpu/drm/drm_mode_config.c

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14

include/drm/drm_modeset_helper_vtables.h

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