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429 lines
13 KiB
429 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2016 Noralf Trønnes |
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*/ |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <drm/drm_atomic.h> |
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#include <drm/drm_atomic_helper.h> |
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#include <drm/drm_bridge.h> |
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#include <drm/drm_drv.h> |
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#include <drm/drm_gem_atomic_helper.h> |
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#include <drm/drm_managed.h> |
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#include <drm/drm_plane_helper.h> |
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#include <drm/drm_probe_helper.h> |
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#include <drm/drm_simple_kms_helper.h> |
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/** |
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* DOC: overview |
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* |
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* This helper library provides helpers for drivers for simple display |
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* hardware. |
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* |
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* drm_simple_display_pipe_init() initializes a simple display pipeline |
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* which has only one full-screen scanout buffer feeding one output. The |
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* pipeline is represented by &struct drm_simple_display_pipe and binds |
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* together &drm_plane, &drm_crtc and &drm_encoder structures into one fixed |
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* entity. Some flexibility for code reuse is provided through a separately |
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* allocated &drm_connector object and supporting optional &drm_bridge |
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* encoder drivers. |
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* |
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* Many drivers require only a very simple encoder that fulfills the minimum |
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* requirements of the display pipeline and does not add additional |
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* functionality. The function drm_simple_encoder_init() provides an |
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* implementation of such an encoder. |
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*/ |
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static const struct drm_encoder_funcs drm_simple_encoder_funcs_cleanup = { |
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.destroy = drm_encoder_cleanup, |
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}; |
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/** |
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* drm_simple_encoder_init - Initialize a preallocated encoder with |
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* basic functionality. |
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* @dev: drm device |
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* @encoder: the encoder to initialize |
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* @encoder_type: user visible type of the encoder |
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* |
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* Initialises a preallocated encoder that has no further functionality. |
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* Settings for possible CRTC and clones are left to their initial values. |
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* The encoder will be cleaned up automatically as part of the mode-setting |
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* cleanup. |
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* |
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* The caller of drm_simple_encoder_init() is responsible for freeing |
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* the encoder's memory after the encoder has been cleaned up. At the |
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* moment this only works reliably if the encoder data structure is |
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* stored in the device structure. Free the encoder's memory as part of |
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* the device release function. |
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* |
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* Note: consider using drmm_simple_encoder_alloc() instead of |
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* drm_simple_encoder_init() to let the DRM managed resource infrastructure |
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* take care of cleanup and deallocation. |
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* |
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* Returns: |
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* Zero on success, error code on failure. |
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*/ |
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int drm_simple_encoder_init(struct drm_device *dev, |
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struct drm_encoder *encoder, |
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int encoder_type) |
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{ |
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return drm_encoder_init(dev, encoder, |
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&drm_simple_encoder_funcs_cleanup, |
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encoder_type, NULL); |
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} |
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EXPORT_SYMBOL(drm_simple_encoder_init); |
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void *__drmm_simple_encoder_alloc(struct drm_device *dev, size_t size, |
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size_t offset, int encoder_type) |
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{ |
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return __drmm_encoder_alloc(dev, size, offset, NULL, encoder_type, |
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NULL); |
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} |
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EXPORT_SYMBOL(__drmm_simple_encoder_alloc); |
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static enum drm_mode_status |
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drm_simple_kms_crtc_mode_valid(struct drm_crtc *crtc, |
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const struct drm_display_mode *mode) |
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{ |
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struct drm_simple_display_pipe *pipe; |
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pipe = container_of(crtc, struct drm_simple_display_pipe, crtc); |
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if (!pipe->funcs || !pipe->funcs->mode_valid) |
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/* Anything goes */ |
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return MODE_OK; |
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return pipe->funcs->mode_valid(pipe, mode); |
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} |
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static int drm_simple_kms_crtc_check(struct drm_crtc *crtc, |
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struct drm_atomic_state *state) |
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{ |
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struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, |
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crtc); |
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bool has_primary = crtc_state->plane_mask & |
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drm_plane_mask(crtc->primary); |
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/* We always want to have an active plane with an active CRTC */ |
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if (has_primary != crtc_state->enable) |
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return -EINVAL; |
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return drm_atomic_add_affected_planes(state, crtc); |
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} |
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static void drm_simple_kms_crtc_enable(struct drm_crtc *crtc, |
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struct drm_atomic_state *state) |
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{ |
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struct drm_plane *plane; |
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struct drm_simple_display_pipe *pipe; |
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pipe = container_of(crtc, struct drm_simple_display_pipe, crtc); |
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if (!pipe->funcs || !pipe->funcs->enable) |
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return; |
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plane = &pipe->plane; |
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pipe->funcs->enable(pipe, crtc->state, plane->state); |
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} |
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static void drm_simple_kms_crtc_disable(struct drm_crtc *crtc, |
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struct drm_atomic_state *state) |
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{ |
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struct drm_simple_display_pipe *pipe; |
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pipe = container_of(crtc, struct drm_simple_display_pipe, crtc); |
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if (!pipe->funcs || !pipe->funcs->disable) |
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return; |
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pipe->funcs->disable(pipe); |
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} |
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static const struct drm_crtc_helper_funcs drm_simple_kms_crtc_helper_funcs = { |
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.mode_valid = drm_simple_kms_crtc_mode_valid, |
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.atomic_check = drm_simple_kms_crtc_check, |
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.atomic_enable = drm_simple_kms_crtc_enable, |
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.atomic_disable = drm_simple_kms_crtc_disable, |
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}; |
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static void drm_simple_kms_crtc_reset(struct drm_crtc *crtc) |
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{ |
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struct drm_simple_display_pipe *pipe; |
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pipe = container_of(crtc, struct drm_simple_display_pipe, crtc); |
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if (!pipe->funcs || !pipe->funcs->reset_crtc) |
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return drm_atomic_helper_crtc_reset(crtc); |
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return pipe->funcs->reset_crtc(pipe); |
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} |
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static struct drm_crtc_state *drm_simple_kms_crtc_duplicate_state(struct drm_crtc *crtc) |
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{ |
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struct drm_simple_display_pipe *pipe; |
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pipe = container_of(crtc, struct drm_simple_display_pipe, crtc); |
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if (!pipe->funcs || !pipe->funcs->duplicate_crtc_state) |
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return drm_atomic_helper_crtc_duplicate_state(crtc); |
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return pipe->funcs->duplicate_crtc_state(pipe); |
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} |
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static void drm_simple_kms_crtc_destroy_state(struct drm_crtc *crtc, struct drm_crtc_state *state) |
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{ |
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struct drm_simple_display_pipe *pipe; |
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pipe = container_of(crtc, struct drm_simple_display_pipe, crtc); |
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if (!pipe->funcs || !pipe->funcs->destroy_crtc_state) |
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drm_atomic_helper_crtc_destroy_state(crtc, state); |
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else |
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pipe->funcs->destroy_crtc_state(pipe, state); |
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} |
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static int drm_simple_kms_crtc_enable_vblank(struct drm_crtc *crtc) |
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{ |
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struct drm_simple_display_pipe *pipe; |
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pipe = container_of(crtc, struct drm_simple_display_pipe, crtc); |
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if (!pipe->funcs || !pipe->funcs->enable_vblank) |
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return 0; |
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return pipe->funcs->enable_vblank(pipe); |
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} |
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static void drm_simple_kms_crtc_disable_vblank(struct drm_crtc *crtc) |
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{ |
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struct drm_simple_display_pipe *pipe; |
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pipe = container_of(crtc, struct drm_simple_display_pipe, crtc); |
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if (!pipe->funcs || !pipe->funcs->disable_vblank) |
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return; |
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pipe->funcs->disable_vblank(pipe); |
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} |
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static const struct drm_crtc_funcs drm_simple_kms_crtc_funcs = { |
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.reset = drm_simple_kms_crtc_reset, |
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.destroy = drm_crtc_cleanup, |
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.set_config = drm_atomic_helper_set_config, |
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.page_flip = drm_atomic_helper_page_flip, |
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.atomic_duplicate_state = drm_simple_kms_crtc_duplicate_state, |
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.atomic_destroy_state = drm_simple_kms_crtc_destroy_state, |
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.enable_vblank = drm_simple_kms_crtc_enable_vblank, |
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.disable_vblank = drm_simple_kms_crtc_disable_vblank, |
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}; |
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static int drm_simple_kms_plane_atomic_check(struct drm_plane *plane, |
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struct drm_atomic_state *state) |
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{ |
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struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, |
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plane); |
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struct drm_simple_display_pipe *pipe; |
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struct drm_crtc_state *crtc_state; |
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int ret; |
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pipe = container_of(plane, struct drm_simple_display_pipe, plane); |
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crtc_state = drm_atomic_get_new_crtc_state(state, |
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&pipe->crtc); |
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ret = drm_atomic_helper_check_plane_state(plane_state, crtc_state, |
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DRM_PLANE_HELPER_NO_SCALING, |
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DRM_PLANE_HELPER_NO_SCALING, |
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false, true); |
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if (ret) |
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return ret; |
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if (!plane_state->visible) |
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return 0; |
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if (!pipe->funcs || !pipe->funcs->check) |
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return 0; |
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return pipe->funcs->check(pipe, plane_state, crtc_state); |
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} |
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static void drm_simple_kms_plane_atomic_update(struct drm_plane *plane, |
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struct drm_atomic_state *state) |
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{ |
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struct drm_plane_state *old_pstate = drm_atomic_get_old_plane_state(state, |
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plane); |
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struct drm_simple_display_pipe *pipe; |
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pipe = container_of(plane, struct drm_simple_display_pipe, plane); |
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if (!pipe->funcs || !pipe->funcs->update) |
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return; |
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pipe->funcs->update(pipe, old_pstate); |
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} |
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static int drm_simple_kms_plane_prepare_fb(struct drm_plane *plane, |
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struct drm_plane_state *state) |
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{ |
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struct drm_simple_display_pipe *pipe; |
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pipe = container_of(plane, struct drm_simple_display_pipe, plane); |
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if (!pipe->funcs || !pipe->funcs->prepare_fb) { |
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if (WARN_ON_ONCE(!drm_core_check_feature(plane->dev, DRIVER_GEM))) |
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return 0; |
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WARN_ON_ONCE(pipe->funcs && pipe->funcs->cleanup_fb); |
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return drm_gem_simple_display_pipe_prepare_fb(pipe, state); |
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} |
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return pipe->funcs->prepare_fb(pipe, state); |
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} |
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static void drm_simple_kms_plane_cleanup_fb(struct drm_plane *plane, |
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struct drm_plane_state *state) |
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{ |
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struct drm_simple_display_pipe *pipe; |
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pipe = container_of(plane, struct drm_simple_display_pipe, plane); |
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if (!pipe->funcs || !pipe->funcs->cleanup_fb) |
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return; |
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pipe->funcs->cleanup_fb(pipe, state); |
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} |
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static bool drm_simple_kms_format_mod_supported(struct drm_plane *plane, |
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uint32_t format, |
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uint64_t modifier) |
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{ |
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return modifier == DRM_FORMAT_MOD_LINEAR; |
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} |
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static const struct drm_plane_helper_funcs drm_simple_kms_plane_helper_funcs = { |
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.prepare_fb = drm_simple_kms_plane_prepare_fb, |
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.cleanup_fb = drm_simple_kms_plane_cleanup_fb, |
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.atomic_check = drm_simple_kms_plane_atomic_check, |
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.atomic_update = drm_simple_kms_plane_atomic_update, |
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}; |
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static void drm_simple_kms_plane_reset(struct drm_plane *plane) |
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{ |
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struct drm_simple_display_pipe *pipe; |
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pipe = container_of(plane, struct drm_simple_display_pipe, plane); |
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if (!pipe->funcs || !pipe->funcs->reset_plane) |
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return drm_atomic_helper_plane_reset(plane); |
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return pipe->funcs->reset_plane(pipe); |
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} |
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static struct drm_plane_state *drm_simple_kms_plane_duplicate_state(struct drm_plane *plane) |
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{ |
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struct drm_simple_display_pipe *pipe; |
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pipe = container_of(plane, struct drm_simple_display_pipe, plane); |
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if (!pipe->funcs || !pipe->funcs->duplicate_plane_state) |
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return drm_atomic_helper_plane_duplicate_state(plane); |
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return pipe->funcs->duplicate_plane_state(pipe); |
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} |
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static void drm_simple_kms_plane_destroy_state(struct drm_plane *plane, |
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struct drm_plane_state *state) |
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{ |
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struct drm_simple_display_pipe *pipe; |
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pipe = container_of(plane, struct drm_simple_display_pipe, plane); |
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if (!pipe->funcs || !pipe->funcs->destroy_plane_state) |
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drm_atomic_helper_plane_destroy_state(plane, state); |
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else |
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pipe->funcs->destroy_plane_state(pipe, state); |
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} |
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static const struct drm_plane_funcs drm_simple_kms_plane_funcs = { |
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.update_plane = drm_atomic_helper_update_plane, |
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.disable_plane = drm_atomic_helper_disable_plane, |
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.destroy = drm_plane_cleanup, |
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.reset = drm_simple_kms_plane_reset, |
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.atomic_duplicate_state = drm_simple_kms_plane_duplicate_state, |
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.atomic_destroy_state = drm_simple_kms_plane_destroy_state, |
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.format_mod_supported = drm_simple_kms_format_mod_supported, |
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}; |
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/** |
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* drm_simple_display_pipe_attach_bridge - Attach a bridge to the display pipe |
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* @pipe: simple display pipe object |
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* @bridge: bridge to attach |
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* |
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* Makes it possible to still use the drm_simple_display_pipe helpers when |
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* a DRM bridge has to be used. |
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* |
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* Note that you probably want to initialize the pipe by passing a NULL |
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* connector to drm_simple_display_pipe_init(). |
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* |
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* Returns: |
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* Zero on success, negative error code on failure. |
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*/ |
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int drm_simple_display_pipe_attach_bridge(struct drm_simple_display_pipe *pipe, |
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struct drm_bridge *bridge) |
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{ |
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return drm_bridge_attach(&pipe->encoder, bridge, NULL, 0); |
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} |
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EXPORT_SYMBOL(drm_simple_display_pipe_attach_bridge); |
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/** |
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* drm_simple_display_pipe_init - Initialize a simple display pipeline |
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* @dev: DRM device |
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* @pipe: simple display pipe object to initialize |
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* @funcs: callbacks for the display pipe (optional) |
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* @formats: array of supported formats (DRM_FORMAT\_\*) |
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* @format_count: number of elements in @formats |
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* @format_modifiers: array of formats modifiers |
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* @connector: connector to attach and register (optional) |
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* |
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* Sets up a display pipeline which consist of a really simple |
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* plane-crtc-encoder pipe. |
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* |
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* If a connector is supplied, the pipe will be coupled with the provided |
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* connector. You may supply a NULL connector when using drm bridges, that |
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* handle connectors themselves (see drm_simple_display_pipe_attach_bridge()). |
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* |
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* Teardown of a simple display pipe is all handled automatically by the drm |
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* core through calling drm_mode_config_cleanup(). Drivers afterwards need to |
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* release the memory for the structure themselves. |
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* |
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* Returns: |
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* Zero on success, negative error code on failure. |
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*/ |
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int drm_simple_display_pipe_init(struct drm_device *dev, |
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struct drm_simple_display_pipe *pipe, |
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const struct drm_simple_display_pipe_funcs *funcs, |
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const uint32_t *formats, unsigned int format_count, |
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const uint64_t *format_modifiers, |
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struct drm_connector *connector) |
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{ |
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struct drm_encoder *encoder = &pipe->encoder; |
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struct drm_plane *plane = &pipe->plane; |
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struct drm_crtc *crtc = &pipe->crtc; |
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int ret; |
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pipe->connector = connector; |
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pipe->funcs = funcs; |
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drm_plane_helper_add(plane, &drm_simple_kms_plane_helper_funcs); |
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ret = drm_universal_plane_init(dev, plane, 0, |
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&drm_simple_kms_plane_funcs, |
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formats, format_count, |
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format_modifiers, |
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DRM_PLANE_TYPE_PRIMARY, NULL); |
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if (ret) |
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return ret; |
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drm_crtc_helper_add(crtc, &drm_simple_kms_crtc_helper_funcs); |
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ret = drm_crtc_init_with_planes(dev, crtc, plane, NULL, |
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&drm_simple_kms_crtc_funcs, NULL); |
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if (ret) |
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return ret; |
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encoder->possible_crtcs = drm_crtc_mask(crtc); |
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ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_NONE); |
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if (ret || !connector) |
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return ret; |
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return drm_connector_attach_encoder(connector, encoder); |
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} |
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EXPORT_SYMBOL(drm_simple_display_pipe_init); |
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MODULE_LICENSE("GPL");
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