diff options
Diffstat (limited to 'drivers/gpu/drm/vc4/vc4_kms.c')
| -rw-r--r-- | drivers/gpu/drm/vc4/vc4_kms.c | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c new file mode 100644 index 000000000000..f95f2df5f8d1 --- /dev/null +++ b/drivers/gpu/drm/vc4/vc4_kms.c @@ -0,0 +1,214 @@ +/* + * Copyright (C) 2015 Broadcom + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +/** + * DOC: VC4 KMS + * + * This is the general code for implementing KMS mode setting that + * doesn't clearly associate with any of the other objects (plane, + * crtc, HDMI encoder). + */ + +#include "drm_crtc.h" +#include "drm_atomic.h" +#include "drm_atomic_helper.h" +#include "drm_crtc_helper.h" +#include "drm_plane_helper.h" +#include "drm_fb_cma_helper.h" +#include "vc4_drv.h" + +static void vc4_output_poll_changed(struct drm_device *dev) +{ + struct vc4_dev *vc4 = to_vc4_dev(dev); + + if (vc4->fbdev) + drm_fbdev_cma_hotplug_event(vc4->fbdev); +} + +struct vc4_commit { + struct drm_device *dev; + struct drm_atomic_state *state; + struct vc4_seqno_cb cb; +}; + +static void +vc4_atomic_complete_commit(struct vc4_commit *c) +{ + struct drm_atomic_state *state = c->state; + struct drm_device *dev = state->dev; + struct vc4_dev *vc4 = to_vc4_dev(dev); + + drm_atomic_helper_commit_modeset_disables(dev, state); + + drm_atomic_helper_commit_planes(dev, state, false); + + drm_atomic_helper_commit_modeset_enables(dev, state); + + drm_atomic_helper_wait_for_vblanks(dev, state); + + drm_atomic_helper_cleanup_planes(dev, state); + + drm_atomic_state_free(state); + + up(&vc4->async_modeset); + + kfree(c); +} + +static void +vc4_atomic_complete_commit_seqno_cb(struct vc4_seqno_cb *cb) +{ + struct vc4_commit *c = container_of(cb, struct vc4_commit, cb); + + vc4_atomic_complete_commit(c); +} + +static struct vc4_commit *commit_init(struct drm_atomic_state *state) +{ + struct vc4_commit *c = kzalloc(sizeof(*c), GFP_KERNEL); + + if (!c) + return NULL; + c->dev = state->dev; + c->state = state; + + return c; +} + +/** + * vc4_atomic_commit - commit validated state object + * @dev: DRM device + * @state: the driver state object + * @async: asynchronous commit + * + * This function commits a with drm_atomic_helper_check() pre-validated state + * object. This can still fail when e.g. the framebuffer reservation fails. For + * now this doesn't implement asynchronous commits. + * + * RETURNS + * Zero for success or -errno. + */ +static int vc4_atomic_commit(struct drm_device *dev, + struct drm_atomic_state *state, + bool async) +{ + struct vc4_dev *vc4 = to_vc4_dev(dev); + int ret; + int i; + uint64_t wait_seqno = 0; + struct vc4_commit *c; + + c = commit_init(state); + if (!c) + return -ENOMEM; + + /* Make sure that any outstanding modesets have finished. */ + ret = down_interruptible(&vc4->async_modeset); + if (ret) { + kfree(c); + return ret; + } + + ret = drm_atomic_helper_prepare_planes(dev, state); + if (ret) { + kfree(c); + up(&vc4->async_modeset); + return ret; + } + + for (i = 0; i < dev->mode_config.num_total_plane; i++) { + struct drm_plane *plane = state->planes[i]; + struct drm_plane_state *new_state = state->plane_states[i]; + + if (!plane) + continue; + + if ((plane->state->fb != new_state->fb) && new_state->fb) { + struct drm_gem_cma_object *cma_bo = + drm_fb_cma_get_gem_obj(new_state->fb, 0); + struct vc4_bo *bo = to_vc4_bo(&cma_bo->base); + + wait_seqno = max(bo->seqno, wait_seqno); + } + } + + /* + * This is the point of no return - everything below never fails except + * when the hw goes bonghits. Which means we can commit the new state on + * the software side now. + */ + + drm_atomic_helper_swap_state(dev, state); + + /* + * Everything below can be run asynchronously without the need to grab + * any modeset locks at all under one condition: It must be guaranteed + * that the asynchronous work has either been cancelled (if the driver + * supports it, which at least requires that the framebuffers get + * cleaned up with drm_atomic_helper_cleanup_planes()) or completed + * before the new state gets committed on the software side with + * drm_atomic_helper_swap_state(). + * + * This scheme allows new atomic state updates to be prepared and + * checked in parallel to the asynchronous completion of the previous + * update. Which is important since compositors need to figure out the + * composition of the next frame right after having submitted the + * current layout. + */ + + if (async) { + vc4_queue_seqno_cb(dev, &c->cb, wait_seqno, + vc4_atomic_complete_commit_seqno_cb); + } else { + vc4_wait_for_seqno(dev, wait_seqno, ~0ull, false); + vc4_atomic_complete_commit(c); + } + + return 0; +} + +static const struct drm_mode_config_funcs vc4_mode_funcs = { + .output_poll_changed = vc4_output_poll_changed, + .atomic_check = drm_atomic_helper_check, + .atomic_commit = vc4_atomic_commit, + .fb_create = drm_fb_cma_create, +}; + +int vc4_kms_load(struct drm_device *dev) +{ + struct vc4_dev *vc4 = to_vc4_dev(dev); + int ret; + + sema_init(&vc4->async_modeset, 1); + + ret = drm_vblank_init(dev, dev->mode_config.num_crtc); + if (ret < 0) { + dev_err(dev->dev, "failed to initialize vblank\n"); + return ret; + } + + dev->mode_config.max_width = 2048; + dev->mode_config.max_height = 2048; + dev->mode_config.funcs = &vc4_mode_funcs; + dev->mode_config.preferred_depth = 24; + dev->mode_config.async_page_flip = true; + + dev->vblank_disable_allowed = true; + + drm_mode_config_reset(dev); + + vc4->fbdev = drm_fbdev_cma_init(dev, 32, + dev->mode_config.num_crtc, + dev->mode_config.num_connector); + if (IS_ERR(vc4->fbdev)) + vc4->fbdev = NULL; + + drm_kms_helper_poll_init(dev); + + return 0; +} |
