Hi, This series started from my work on the hardware state readout[1], and more specifically a discussion with Thomas[2].
This series expands the work that has been merged recently to make drm_private_obj and drm_private_state allocation a bit more consistent and ended up creating a new atomic_create_state callback to allocate a new state with no side effect. The first patches document the existing behaviour and fix a few cleanups and typos. Then, __drm_*_state_reset() helpers are renamed to __drm_*_state_init() to clarify that they initialize rather than reset state, and we add the new atomic_create_state callback to every other DRM object (planes, CRTCs, connectors, colorops). Next, we leverage those new callbacks to create a new helper, drm_mode_config_create_initial_state(), to create the initial state for all the objects of a driver, and update the driver skeleton to recommend it. Finally, we convert the tidss driver and the bridge_connector to the new pattern. This was tested on a TI SK-AM62, with the tidss driver. Let me know what you think, Maxime 1: https://lore.kernel.org/dri-devel/[email protected]/ 2: https://lore.kernel.org/dri-devel/[email protected]/ Signed-off-by: Maxime Ripard <[email protected]> --- Changes in v4: - Rebased on current drm-misc-next - Update drm_atomic_state to drm_atomic_commit - Various doc impromvements - Don't call drm_crtc_vblank_reset in create_state - Prevent mem leak if states already have a state when drm_mode_config_reset or _create_initial_state are called - Link to v3: https://lore.kernel.org/r/[email protected] Changes in v3: - Reintroduce state documentation that was dropped by accident - Change name to drm_mode_config_create_initial_state() - Don't call drm_mode_config_create_initial_state() in drm_dev_register anymore - Drop __drm_atomic_helper_*_create_state - Improve documentation and commit messages where necessary - Collected tags - Link to v2: https://lore.kernel.org/r/[email protected] Changes in v2: - Change the _state_reset function names to _state_init - Change the colorop too - Various doc improvements - Link to v1: https://lore.kernel.org/r/[email protected] --- Maxime Ripard (20): drm/atomic: Document atomic commit lifetime drm/colorop: Fix typos in the doc drm/atomic: Drop drm_private_obj.state assignment from create_state drm/atomic: Expand atomic_create_state expectations for drm_private_obj drm/mode-config: Document drm_private_obj exclusion from drm_mode_config_reset() drm/colorop: Rename __drm_colorop_state_reset() drm/colorop: Create drm_atomic_helper_colorop_create_state() drm/atomic-state-helper: Fix __drm_atomic_helper_plane_reset() doc typo drm/atomic-state-helper: Rename __drm_atomic_helper_plane_state_reset() drm/plane: Add new atomic_create_state callback drm/atomic-state-helper: Rename __drm_atomic_helper_crtc_state_reset() drm/crtc: Add new atomic_create_state callback drm/atomic-state-helper: Rename __drm_atomic_helper_connector_state_reset() drm/hdmi: Rename __drm_atomic_helper_connector_hdmi_reset() drm/connector: Add new atomic_create_state callback drm/mode-config: Create drm_mode_config_create_initial_state() drm/drv: Switch skeleton to drm_mode_config_create_initial_state() drm/tidss: Switch to drm_mode_config_create_initial_state() drm/tidss: Convert to atomic_create_state drm/bridge_connector: Convert to atomic_create_state Documentation/gpu/drm-kms.rst | 6 + drivers/gpu/drm/display/drm_bridge_connector.c | 17 +- drivers/gpu/drm/display/drm_hdmi_state_helper.c | 15 +- drivers/gpu/drm/drm_atomic.c | 66 ++++++++ drivers/gpu/drm/drm_atomic_state_helper.c | 114 ++++++++++--- drivers/gpu/drm/drm_colorop.c | 41 ++++- drivers/gpu/drm/drm_drv.c | 4 +- drivers/gpu/drm/drm_mode_config.c | 187 ++++++++++++++++++++- drivers/gpu/drm/i915/display/intel_crtc.c | 2 +- drivers/gpu/drm/i915/display/intel_plane.c | 2 +- drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c | 2 +- drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c | 2 +- drivers/gpu/drm/tidss/tidss_crtc.c | 17 +- drivers/gpu/drm/tidss/tidss_drv.c | 6 +- drivers/gpu/drm/tidss/tidss_plane.c | 2 +- drivers/gpu/drm/vc4/vc4_hdmi.c | 2 +- include/drm/display/drm_hdmi_state_helper.h | 4 +- include/drm/drm_atomic.h | 5 +- include/drm/drm_atomic_state_helper.h | 12 +- include/drm/drm_colorop.h | 2 + include/drm/drm_connector.h | 16 ++ include/drm/drm_crtc.h | 16 ++ include/drm/drm_mode_config.h | 1 + include/drm/drm_plane.h | 16 ++ 24 files changed, 489 insertions(+), 68 deletions(-) --- base-commit: b462608de92a7cac450781f9d8d4c7cf3ccf82db change-id: 20260310-drm-mode-config-init-1e1f52b745d0 Best regards, -- Maxime Ripard <[email protected]>
