/* * 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/drm_crtc.h> #include <drm/drm_atomic.h> #include <drm/drm_atomic_helper.h> #include <drm/drm_crtc_helper.h> #include <drm/drm_plane_helper.h> #include <drm/drm_gem_framebuffer_helper.h> #include "vc4_drv.h" #include "vc4_regs.h" struct vc4_ctm_state { struct drm_private_state base; struct drm_color_ctm *ctm; int fifo; }; static struct vc4_ctm_state *to_vc4_ctm_state(struct drm_private_state *priv) { return container_of(priv, struct vc4_ctm_state, base); } static struct vc4_ctm_state *vc4_get_ctm_state(struct drm_atomic_state *state, struct drm_private_obj *manager) { struct drm_device *dev = state->dev; struct vc4_dev *vc4 = dev->dev_private; struct drm_private_state *priv_state; int ret; ret = drm_modeset_lock(&vc4->ctm_state_lock, state->acquire_ctx); if (ret) return ERR_PTR(ret); priv_state = drm_atomic_get_private_obj_state(state, manager); if (IS_ERR(priv_state)) return ERR_CAST(priv_state); return to_vc4_ctm_state(priv_state); } static struct drm_private_state * vc4_ctm_duplicate_state(struct drm_private_obj *obj) { struct vc4_ctm_state *state; state = kmemdup(obj->state, sizeof(*state), GFP_KERNEL); if (!state) return NULL; __drm_atomic_helper_private_obj_duplicate_state(obj, &state->base); return &state->base; } static void vc4_ctm_destroy_state(struct drm_private_obj *obj, struct drm_private_state *state) { struct vc4_ctm_state *ctm_state = to_vc4_ctm_state(state); kfree(ctm_state); } static const struct drm_private_state_funcs vc4_ctm_state_funcs = { .atomic_duplicate_state = vc4_ctm_duplicate_state, .atomic_destroy_state = vc4_ctm_destroy_state, }; /* Converts a DRM S31.32 value to the HW S0.9 format. */ static u16 vc4_ctm_s31_32_to_s0_9(u64 in) { u16 r; /* Sign bit. */ r = in & BIT_ULL(63) ? BIT(9) : 0; if ((in & GENMASK_ULL(62, 32)) > 0) { /* We have zero integer bits so we can only saturate here. */ r |= GENMASK(8, 0); } else { /* Otherwise take the 9 most important fractional bits. */ r |= (in >> 23) & GENMASK(8, 0); } return r; } static void vc4_ctm_commit(struct vc4_dev *vc4, struct drm_atomic_state *state) { struct vc4_ctm_state *ctm_state = to_vc4_ctm_state(vc4->ctm_manager.state); struct drm_color_ctm *ctm = ctm_state->ctm; if (ctm_state->fifo) { HVS_WRITE(SCALER_OLEDCOEF2, VC4_SET_FIELD(vc4_ctm_s31_32_to_s0_9(ctm->matrix[0]), SCALER_OLEDCOEF2_R_TO_R) | VC4_SET_FIELD(vc4_ctm_s31_32_to_s0_9(ctm->matrix[3]), SCALER_OLEDCOEF2_R_TO_G) | VC4_SET_FIELD(vc4_ctm_s31_32_to_s0_9(ctm->matrix[6]), SCALER_OLEDCOEF2_R_TO_B)); HVS_WRITE(SCALER_OLEDCOEF1, VC4_SET_FIELD(vc4_ctm_s31_32_to_s0_9(ctm->matrix[1]), SCALER_OLEDCOEF1_G_TO_R) | VC4_SET_FIELD(vc4_ctm_s31_32_to_s0_9(ctm->matrix[4]), SCALER_OLEDCOEF1_G_TO_G) | VC4_SET_FIELD(vc4_ctm_s31_32_to_s0_9(ctm->matrix[7]), SCALER_OLEDCOEF1_G_TO_B)); HVS_WRITE(SCALER_OLEDCOEF0, VC4_SET_FIELD(vc4_ctm_s31_32_to_s0_9(ctm->matrix[2]), SCALER_OLEDCOEF0_B_TO_R) | VC4_SET_FIELD(vc4_ctm_s31_32_to_s0_9(ctm->matrix[5]), SCALER_OLEDCOEF0_B_TO_G) | VC4_SET_FIELD(vc4_ctm_s31_32_to_s0_9(ctm->matrix[8]), SCALER_OLEDCOEF0_B_TO_B)); } HVS_WRITE(SCALER_OLEDOFFS, VC4_SET_FIELD(ctm_state->fifo, SCALER_OLEDOFFS_DISPFIFO)); } static void vc4_atomic_complete_commit(struct drm_atomic_state *state) { struct drm_device *dev = state->dev; struct vc4_dev *vc4 = to_vc4_dev(dev); drm_atomic_helper_wait_for_fences(dev, state, false); drm_atomic_helper_wait_for_dependencies(state); drm_atomic_helper_commit_modeset_disables(dev, state); vc4_ctm_commit(vc4, state); drm_atomic_helper_commit_planes(dev, state, 0); drm_atomic_helper_commit_modeset_enables(dev, state); drm_atomic_helper_fake_vblank(state); drm_atomic_helper_commit_hw_done(state); drm_atomic_helper_wait_for_flip_done(dev, state); drm_atomic_helper_cleanup_planes(dev, state); drm_atomic_helper_commit_cleanup_done(state); drm_atomic_state_put(state); up(&vc4->async_modeset); } static void commit_work(struct work_struct *work) { struct drm_atomic_state *state = container_of(work, struct drm_atomic_state, commit_work); vc4_atomic_complete_commit(state); } /** * vc4_atomic_commit - commit validated state object * @dev: DRM device * @state: the driver state object * @nonblock: nonblocking 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 nonblock) { struct vc4_dev *vc4 = to_vc4_dev(dev); int ret; if (state->async_update) { ret = down_interruptible(&vc4->async_modeset); if (ret) return ret; ret = drm_atomic_helper_prepare_planes(dev, state); if (ret) { up(&vc4->async_modeset); return ret; } drm_atomic_helper_async_commit(dev, state); drm_atomic_helper_cleanup_planes(dev, state); up(&vc4->async_modeset); return 0; } ret = drm_atomic_helper_setup_commit(state, nonblock); if (ret) return ret; INIT_WORK(&state->commit_work, commit_work); ret = down_interruptible(&vc4->async_modeset); if (ret) return ret; ret = drm_atomic_helper_prepare_planes(dev, state); if (ret) { up(&vc4->async_modeset); return ret; } if (!nonblock) { ret = drm_atomic_helper_wait_for_fences(dev, state, true); if (ret) { drm_atomic_helper_cleanup_planes(dev, state); up(&vc4->async_modeset); return ret; } } /* * 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. */ BUG_ON(drm_atomic_helper_swap_state(state, false) < 0); /* * 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. */ drm_atomic_state_get(state); if (nonblock) queue_work(system_unbound_wq, &state->commit_work); else vc4_atomic_complete_commit(state); return 0; } static struct drm_framebuffer *vc4_fb_create(struct drm_device *dev, struct drm_file *file_priv, const struct drm_mode_fb_cmd2 *mode_cmd) { struct drm_mode_fb_cmd2 mode_cmd_local; /* If the user didn't specify a modifier, use the * vc4_set_tiling_ioctl() state for the BO. */ if (!(mode_cmd->flags & DRM_MODE_FB_MODIFIERS)) { struct drm_gem_object *gem_obj; struct vc4_bo *bo; gem_obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[0]); if (!gem_obj) { DRM_DEBUG("Failed to look up GEM BO %d\n", mode_cmd->handles[0]); return ERR_PTR(-ENOENT); } bo = to_vc4_bo(gem_obj); mode_cmd_local = *mode_cmd; if (bo->t_format) { mode_cmd_local.modifier[0] = DRM_FORMAT_MOD_BROADCOM_VC4_T_TILED; } else { mode_cmd_local.modifier[0] = DRM_FORMAT_MOD_NONE; } drm_gem_object_put_unlocked(gem_obj); mode_cmd = &mode_cmd_local; } return drm_gem_fb_create(dev, file_priv, mode_cmd); } /* Our CTM has some peculiar limitations: we can only enable it for one CRTC * at a time and the HW only supports S0.9 scalars. To account for the latter, * we don't allow userland to set a CTM that we have no hope of approximating. */ static int vc4_ctm_atomic_check(struct drm_device *dev, struct drm_atomic_state *state) { struct vc4_dev *vc4 = to_vc4_dev(dev); struct vc4_ctm_state *ctm_state = NULL; struct drm_crtc *crtc; struct drm_crtc_state *old_crtc_state, *new_crtc_state; struct drm_color_ctm *ctm; int i; for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) { /* CTM is being disabled. */ if (!new_crtc_state->ctm && old_crtc_state->ctm) { ctm_state = vc4_get_ctm_state(state, &vc4->ctm_manager); if (IS_ERR(ctm_state)) return PTR_ERR(ctm_state); ctm_state->fifo = 0; } } for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) { if (new_crtc_state->ctm == old_crtc_state->ctm) continue; if (!ctm_state) { ctm_state = vc4_get_ctm_state(state, &vc4->ctm_manager); if (IS_ERR(ctm_state)) return PTR_ERR(ctm_state); } /* CTM is being enabled or the matrix changed. */ if (new_crtc_state->ctm) { /* fifo is 1-based since 0 disables CTM. */ int fifo = to_vc4_crtc(crtc)->channel + 1; /* Check userland isn't trying to turn on CTM for more * than one CRTC at a time. */ if (ctm_state->fifo && ctm_state->fifo != fifo) { DRM_DEBUG_DRIVER("Too many CTM configured\n"); return -EINVAL; } /* Check we can approximate the specified CTM. * We disallow scalars |c| > 1.0 since the HW has * no integer bits. */ ctm = new_crtc_state->ctm->data; for (i = 0; i < ARRAY_SIZE(ctm->matrix); i++) { u64 val = ctm->matrix[i]; val &= ~BIT_ULL(63); if (val > BIT_ULL(32)) return -EINVAL; } ctm_state->fifo = fifo; ctm_state->ctm = ctm; } } return 0; } static int vc4_atomic_check(struct drm_device *dev, struct drm_atomic_state *state) { int ret; ret = vc4_ctm_atomic_check(dev, state); if (ret < 0) return ret; return drm_atomic_helper_check(dev, state); } static const struct drm_mode_config_funcs vc4_mode_funcs = { .atomic_check = vc4_atomic_check, .atomic_commit = vc4_atomic_commit, .fb_create = vc4_fb_create, }; int vc4_kms_load(struct drm_device *dev) { struct vc4_dev *vc4 = to_vc4_dev(dev); struct vc4_ctm_state *ctm_state; int ret; sema_init(&vc4->async_modeset, 1); /* Set support for vblank irq fast disable, before drm_vblank_init() */ dev->vblank_disable_immediate = true; 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->mode_config.allow_fb_modifiers = true; drm_modeset_lock_init(&vc4->ctm_state_lock); ctm_state = kzalloc(sizeof(*ctm_state), GFP_KERNEL); if (!ctm_state) return -ENOMEM; drm_atomic_private_obj_init(&vc4->ctm_manager, &ctm_state->base, &vc4_ctm_state_funcs); drm_mode_config_reset(dev); drm_kms_helper_poll_init(dev); return 0; }