/* * rcar_du_kms.c -- R-Car Display Unit Mode Setting * * Copyright (C) 2013-2014 Renesas Electronics Corporation * * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #include #include #include #include #include #include #include #include #include #include "rcar_du_crtc.h" #include "rcar_du_drv.h" #include "rcar_du_encoder.h" #include "rcar_du_kms.h" #include "rcar_du_lvdsenc.h" #include "rcar_du_regs.h" /* ----------------------------------------------------------------------------- * Format helpers */ static const struct rcar_du_format_info rcar_du_format_infos[] = { { .fourcc = DRM_FORMAT_RGB565, .bpp = 16, .planes = 1, .pnmr = PnMR_SPIM_TP | PnMR_DDDF_16BPP, .edf = PnDDCR4_EDF_NONE, }, { .fourcc = DRM_FORMAT_ARGB1555, .bpp = 16, .planes = 1, .pnmr = PnMR_SPIM_ALP | PnMR_DDDF_ARGB, .edf = PnDDCR4_EDF_NONE, }, { .fourcc = DRM_FORMAT_XRGB1555, .bpp = 16, .planes = 1, .pnmr = PnMR_SPIM_ALP | PnMR_DDDF_ARGB, .edf = PnDDCR4_EDF_NONE, }, { .fourcc = DRM_FORMAT_XRGB8888, .bpp = 32, .planes = 1, .pnmr = PnMR_SPIM_TP | PnMR_DDDF_16BPP, .edf = PnDDCR4_EDF_RGB888, }, { .fourcc = DRM_FORMAT_ARGB8888, .bpp = 32, .planes = 1, .pnmr = PnMR_SPIM_ALP | PnMR_DDDF_16BPP, .edf = PnDDCR4_EDF_ARGB8888, }, { .fourcc = DRM_FORMAT_UYVY, .bpp = 16, .planes = 1, .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC, .edf = PnDDCR4_EDF_NONE, }, { .fourcc = DRM_FORMAT_YUYV, .bpp = 16, .planes = 1, .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC, .edf = PnDDCR4_EDF_NONE, }, { .fourcc = DRM_FORMAT_NV12, .bpp = 12, .planes = 2, .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC, .edf = PnDDCR4_EDF_NONE, }, { .fourcc = DRM_FORMAT_NV21, .bpp = 12, .planes = 2, .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC, .edf = PnDDCR4_EDF_NONE, }, { /* In YUV 4:2:2, only NV16 is supported (NV61 isn't) */ .fourcc = DRM_FORMAT_NV16, .bpp = 16, .planes = 2, .pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC, .edf = PnDDCR4_EDF_NONE, }, }; const struct rcar_du_format_info *rcar_du_format_info(u32 fourcc) { unsigned int i; for (i = 0; i < ARRAY_SIZE(rcar_du_format_infos); ++i) { if (rcar_du_format_infos[i].fourcc == fourcc) return &rcar_du_format_infos[i]; } return NULL; } /* ----------------------------------------------------------------------------- * Frame buffer */ int rcar_du_dumb_create(struct drm_file *file, struct drm_device *dev, struct drm_mode_create_dumb *args) { struct rcar_du_device *rcdu = dev->dev_private; unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); unsigned int align; /* The R8A7779 DU requires a 16 pixels pitch alignment as documented, * but the R8A7790 DU seems to require a 128 bytes pitch alignment. */ if (rcar_du_needs(rcdu, RCAR_DU_QUIRK_ALIGN_128B)) align = 128; else align = 16 * args->bpp / 8; args->pitch = roundup(min_pitch, align); return drm_gem_cma_dumb_create_internal(file, dev, args); } static struct drm_framebuffer * rcar_du_fb_create(struct drm_device *dev, struct drm_file *file_priv, struct drm_mode_fb_cmd2 *mode_cmd) { struct rcar_du_device *rcdu = dev->dev_private; const struct rcar_du_format_info *format; unsigned int max_pitch; unsigned int align; unsigned int bpp; format = rcar_du_format_info(mode_cmd->pixel_format); if (format == NULL) { dev_dbg(dev->dev, "unsupported pixel format %08x\n", mode_cmd->pixel_format); return ERR_PTR(-EINVAL); } /* * The pitch and alignment constraints are expressed in pixels on the * hardware side and in bytes in the DRM API. */ bpp = format->planes == 2 ? 1 : format->bpp / 8; max_pitch = 4096 * bpp; if (rcar_du_needs(rcdu, RCAR_DU_QUIRK_ALIGN_128B)) align = 128; else align = 16 * bpp; if (mode_cmd->pitches[0] & (align - 1) || mode_cmd->pitches[0] >= max_pitch) { dev_dbg(dev->dev, "invalid pitch value %u\n", mode_cmd->pitches[0]); return ERR_PTR(-EINVAL); } if (format->planes == 2) { if (mode_cmd->pitches[1] != mode_cmd->pitches[0]) { dev_dbg(dev->dev, "luma and chroma pitches do not match\n"); return ERR_PTR(-EINVAL); } } return drm_fb_cma_create(dev, file_priv, mode_cmd); } static void rcar_du_output_poll_changed(struct drm_device *dev) { struct rcar_du_device *rcdu = dev->dev_private; drm_fbdev_cma_hotplug_event(rcdu->fbdev); } /* ----------------------------------------------------------------------------- * Atomic Check and Update */ /* * Atomic hardware plane allocator * * The hardware plane allocator is solely based on the atomic plane states * without keeping any external state to avoid races between .atomic_check() * and .atomic_commit(). * * The core idea is to avoid using a free planes bitmask that would need to be * shared between check and commit handlers with a collective knowledge based on * the allocated hardware plane(s) for each KMS plane. The allocator then loops * over all plane states to compute the free planes bitmask, allocates hardware * planes based on that bitmask, and stores the result back in the plane states. * * For this to work we need to access the current state of planes not touched by * the atomic update. To ensure that it won't be modified, we need to lock all * planes using drm_atomic_get_plane_state(). This effectively serializes atomic * updates from .atomic_check() up to completion (when swapping the states if * the check step has succeeded) or rollback (when freeing the states if the * check step has failed). * * Allocation is performed in the .atomic_check() handler and applied * automatically when the core swaps the old and new states. */ static bool rcar_du_plane_needs_realloc(struct rcar_du_plane *plane, struct rcar_du_plane_state *state) { const struct rcar_du_format_info *cur_format; cur_format = to_rcar_plane_state(plane->plane.state)->format; /* Lowering the number of planes doesn't strictly require reallocation * as the extra hardware plane will be freed when committing, but doing * so could lead to more fragmentation. */ return !cur_format || cur_format->planes != state->format->planes; } static unsigned int rcar_du_plane_hwmask(struct rcar_du_plane_state *state) { unsigned int mask; if (state->hwindex == -1) return 0; mask = 1 << state->hwindex; if (state->format->planes == 2) mask |= 1 << ((state->hwindex + 1) % 8); return mask; } static int rcar_du_plane_hwalloc(unsigned int num_planes, unsigned int free) { unsigned int i; for (i = 0; i < RCAR_DU_NUM_HW_PLANES; ++i) { if (!(free & (1 << i))) continue; if (num_planes == 1 || free & (1 << ((i + 1) % 8))) break; } return i == RCAR_DU_NUM_HW_PLANES ? -EBUSY : i; } static int rcar_du_atomic_check(struct drm_device *dev, struct drm_atomic_state *state) { struct rcar_du_device *rcdu = dev->dev_private; unsigned int group_freed_planes[RCAR_DU_MAX_GROUPS] = { 0, }; unsigned int group_free_planes[RCAR_DU_MAX_GROUPS] = { 0, }; bool needs_realloc = false; unsigned int groups = 0; unsigned int i; int ret; ret = drm_atomic_helper_check(dev, state); if (ret < 0) return ret; /* Check if hardware planes need to be reallocated. */ for (i = 0; i < dev->mode_config.num_total_plane; ++i) { struct rcar_du_plane_state *plane_state; struct rcar_du_plane *plane; unsigned int index; if (!state->planes[i]) continue; plane = to_rcar_plane(state->planes[i]); plane_state = to_rcar_plane_state(state->plane_states[i]); dev_dbg(rcdu->dev, "%s: checking plane (%u,%u)\n", __func__, plane->group->index, plane - plane->group->planes); /* If the plane is being disabled we don't need to go through * the full reallocation procedure. Just mark the hardware * plane(s) as freed. */ if (!plane_state->format) { dev_dbg(rcdu->dev, "%s: plane is being disabled\n", __func__); index = plane - plane->group->planes; group_freed_planes[plane->group->index] |= 1 << index; plane_state->hwindex = -1; continue; } /* If the plane needs to be reallocated mark it as such, and * mark the hardware plane(s) as free. */ if (rcar_du_plane_needs_realloc(plane, plane_state)) { dev_dbg(rcdu->dev, "%s: plane needs reallocation\n", __func__); groups |= 1 << plane->group->index; needs_realloc = true; index = plane - plane->group->planes; group_freed_planes[plane->group->index] |= 1 << index; plane_state->hwindex = -1; } } if (!needs_realloc) return 0; /* Grab all plane states for the groups that need reallocation to ensure * locking and avoid racy updates. This serializes the update operation, * but there's not much we can do about it as that's the hardware * design. * * Compute the used planes mask for each group at the same time to avoid * looping over the planes separately later. */ while (groups) { unsigned int index = ffs(groups) - 1; struct rcar_du_group *group = &rcdu->groups[index]; unsigned int used_planes = 0; dev_dbg(rcdu->dev, "%s: finding free planes for group %u\n", __func__, index); for (i = 0; i < group->num_planes; ++i) { struct rcar_du_plane *plane = &group->planes[i]; struct rcar_du_plane_state *plane_state; struct drm_plane_state *s; s = drm_atomic_get_plane_state(state, &plane->plane); if (IS_ERR(s)) return PTR_ERR(s); /* If the plane has been freed in the above loop its * hardware planes must not be added to the used planes * bitmask. However, the current state doesn't reflect * the free state yet, as we've modified the new state * above. Use the local freed planes list to check for * that condition instead. */ if (group_freed_planes[index] & (1 << i)) { dev_dbg(rcdu->dev, "%s: plane (%u,%u) has been freed, skipping\n", __func__, plane->group->index, plane - plane->group->planes); continue; } plane_state = to_rcar_plane_state(plane->plane.state); used_planes |= rcar_du_plane_hwmask(plane_state); dev_dbg(rcdu->dev, "%s: plane (%u,%u) uses %u hwplanes (index %d)\n", __func__, plane->group->index, plane - plane->group->planes, plane_state->format ? plane_state->format->planes : 0, plane_state->hwindex); } group_free_planes[index] = 0xff & ~used_planes; groups &= ~(1 << index); dev_dbg(rcdu->dev, "%s: group %u free planes mask 0x%02x\n", __func__, index, group_free_planes[index]); } /* Reallocate hardware planes for each plane that needs it. */ for (i = 0; i < dev->mode_config.num_total_plane; ++i) { struct rcar_du_plane_state *plane_state; struct rcar_du_plane *plane; unsigned int crtc_planes; unsigned int free; int idx; if (!state->planes[i]) continue; plane = to_rcar_plane(state->planes[i]); plane_state = to_rcar_plane_state(state->plane_states[i]); dev_dbg(rcdu->dev, "%s: allocating plane (%u,%u)\n", __func__, plane->group->index, plane - plane->group->planes); /* Skip planes that are being disabled or don't need to be * reallocated. */ if (!plane_state->format || !rcar_du_plane_needs_realloc(plane, plane_state)) continue; /* Try to allocate the plane from the free planes currently * associated with the target CRTC to avoid restarting the CRTC * group and thus minimize flicker. If it fails fall back to * allocating from all free planes. */ crtc_planes = to_rcar_crtc(plane_state->state.crtc)->index % 2 ? plane->group->dptsr_planes : ~plane->group->dptsr_planes; free = group_free_planes[plane->group->index]; idx = rcar_du_plane_hwalloc(plane_state->format->planes, free & crtc_planes); if (idx < 0) idx = rcar_du_plane_hwalloc(plane_state->format->planes, free); if (idx < 0) { dev_dbg(rcdu->dev, "%s: no available hardware plane\n", __func__); return idx; } dev_dbg(rcdu->dev, "%s: allocated %u hwplanes (index %u)\n", __func__, plane_state->format->planes, idx); plane_state->hwindex = idx; group_free_planes[plane->group->index] &= ~rcar_du_plane_hwmask(plane_state); dev_dbg(rcdu->dev, "%s: group %u free planes mask 0x%02x\n", __func__, plane->group->index, group_free_planes[plane->group->index]); } return 0; } struct rcar_du_commit { struct work_struct work; struct drm_device *dev; struct drm_atomic_state *state; u32 crtcs; }; static void rcar_du_atomic_complete(struct rcar_du_commit *commit) { struct drm_device *dev = commit->dev; struct rcar_du_device *rcdu = dev->dev_private; struct drm_atomic_state *old_state = commit->state; /* Apply the atomic update. */ drm_atomic_helper_commit_modeset_disables(dev, old_state); drm_atomic_helper_commit_modeset_enables(dev, old_state); drm_atomic_helper_commit_planes(dev, old_state); drm_atomic_helper_wait_for_vblanks(dev, old_state); drm_atomic_helper_cleanup_planes(dev, old_state); drm_atomic_state_free(old_state); /* Complete the commit, wake up any waiter. */ spin_lock(&rcdu->commit.wait.lock); rcdu->commit.pending &= ~commit->crtcs; wake_up_all_locked(&rcdu->commit.wait); spin_unlock(&rcdu->commit.wait.lock); kfree(commit); } static void rcar_du_atomic_work(struct work_struct *work) { struct rcar_du_commit *commit = container_of(work, struct rcar_du_commit, work); rcar_du_atomic_complete(commit); } static int rcar_du_atomic_commit(struct drm_device *dev, struct drm_atomic_state *state, bool async) { struct rcar_du_device *rcdu = dev->dev_private; struct rcar_du_commit *commit; unsigned int i; int ret; ret = drm_atomic_helper_prepare_planes(dev, state); if (ret) return ret; /* Allocate the commit object. */ commit = kzalloc(sizeof(*commit), GFP_KERNEL); if (commit == NULL) { ret = -ENOMEM; goto error; } INIT_WORK(&commit->work, rcar_du_atomic_work); commit->dev = dev; commit->state = state; /* Wait until all affected CRTCs have completed previous commits and * mark them as pending. */ for (i = 0; i < dev->mode_config.num_crtc; ++i) { if (state->crtcs[i]) commit->crtcs |= 1 << drm_crtc_index(state->crtcs[i]); } spin_lock(&rcdu->commit.wait.lock); ret = wait_event_interruptible_locked(rcdu->commit.wait, !(rcdu->commit.pending & commit->crtcs)); if (ret == 0) rcdu->commit.pending |= commit->crtcs; spin_unlock(&rcdu->commit.wait.lock); if (ret) { kfree(commit); goto error; } /* Swap the state, this is the point of no return. */ drm_atomic_helper_swap_state(dev, state); if (async) schedule_work(&commit->work); else rcar_du_atomic_complete(commit); return 0; error: drm_atomic_helper_cleanup_planes(dev, state); return ret; } /* ----------------------------------------------------------------------------- * Initialization */ static const struct drm_mode_config_funcs rcar_du_mode_config_funcs = { .fb_create = rcar_du_fb_create, .output_poll_changed = rcar_du_output_poll_changed, .atomic_check = rcar_du_atomic_check, .atomic_commit = rcar_du_atomic_commit, }; static int rcar_du_encoders_init_one(struct rcar_du_device *rcdu, enum rcar_du_output output, struct of_endpoint *ep) { static const struct { const char *compatible; enum rcar_du_encoder_type type; } encoders[] = { { "adi,adv7123", RCAR_DU_ENCODER_VGA }, { "adi,adv7511w", RCAR_DU_ENCODER_HDMI }, { "thine,thc63lvdm83d", RCAR_DU_ENCODER_LVDS }, }; enum rcar_du_encoder_type enc_type = RCAR_DU_ENCODER_NONE; struct device_node *connector = NULL; struct device_node *encoder = NULL; struct device_node *ep_node = NULL; struct device_node *entity_ep_node; struct device_node *entity; int ret; /* * Locate the connected entity and infer its type from the number of * endpoints. */ entity = of_graph_get_remote_port_parent(ep->local_node); if (!entity) { dev_dbg(rcdu->dev, "unconnected endpoint %s, skipping\n", ep->local_node->full_name); return -ENODEV; } entity_ep_node = of_parse_phandle(ep->local_node, "remote-endpoint", 0); for_each_endpoint_of_node(entity, ep_node) { if (ep_node == entity_ep_node) continue; /* * We've found one endpoint other than the input, this must * be an encoder. Locate the connector. */ encoder = entity; connector = of_graph_get_remote_port_parent(ep_node); of_node_put(ep_node); if (!connector) { dev_warn(rcdu->dev, "no connector for encoder %s, skipping\n", encoder->full_name); of_node_put(entity_ep_node); of_node_put(encoder); return -ENODEV; } break; } of_node_put(entity_ep_node); if (encoder) { /* * If an encoder has been found, get its type based on its * compatible string. */ unsigned int i; for (i = 0; i < ARRAY_SIZE(encoders); ++i) { if (of_device_is_compatible(encoder, encoders[i].compatible)) { enc_type = encoders[i].type; break; } } if (i == ARRAY_SIZE(encoders)) { dev_warn(rcdu->dev, "unknown encoder type for %s, skipping\n", encoder->full_name); of_node_put(encoder); of_node_put(connector); return -EINVAL; } } else { /* * If no encoder has been found the entity must be the * connector. */ connector = entity; } ret = rcar_du_encoder_init(rcdu, enc_type, output, encoder, connector); of_node_put(encoder); of_node_put(connector); if (ret && ret != -EPROBE_DEFER) dev_warn(rcdu->dev, "failed to initialize encoder %s (%d), skipping\n", encoder->full_name, ret); return ret; } static int rcar_du_encoders_init(struct rcar_du_device *rcdu) { struct device_node *np = rcdu->dev->of_node; struct device_node *ep_node; unsigned int num_encoders = 0; /* * Iterate over the endpoints and create one encoder for each output * pipeline. */ for_each_endpoint_of_node(np, ep_node) { enum rcar_du_output output; struct of_endpoint ep; unsigned int i; int ret; ret = of_graph_parse_endpoint(ep_node, &ep); if (ret < 0) { of_node_put(ep_node); return ret; } /* Find the output route corresponding to the port number. */ for (i = 0; i < RCAR_DU_OUTPUT_MAX; ++i) { if (rcdu->info->routes[i].possible_crtcs && rcdu->info->routes[i].port == ep.port) { output = i; break; } } if (i == RCAR_DU_OUTPUT_MAX) { dev_warn(rcdu->dev, "port %u references unexisting output, skipping\n", ep.port); continue; } /* Process the output pipeline. */ ret = rcar_du_encoders_init_one(rcdu, output, &ep); if (ret < 0) { if (ret == -EPROBE_DEFER) { of_node_put(ep_node); return ret; } continue; } num_encoders++; } return num_encoders; } static int rcar_du_properties_init(struct rcar_du_device *rcdu) { rcdu->props.alpha = drm_property_create_range(rcdu->ddev, 0, "alpha", 0, 255); if (rcdu->props.alpha == NULL) return -ENOMEM; /* The color key is expressed as an RGB888 triplet stored in a 32-bit * integer in XRGB8888 format. Bit 24 is used as a flag to disable (0) * or enable source color keying (1). */ rcdu->props.colorkey = drm_property_create_range(rcdu->ddev, 0, "colorkey", 0, 0x01ffffff); if (rcdu->props.colorkey == NULL) return -ENOMEM; rcdu->props.zpos = drm_property_create_range(rcdu->ddev, 0, "zpos", 1, 7); if (rcdu->props.zpos == NULL) return -ENOMEM; return 0; } int rcar_du_modeset_init(struct rcar_du_device *rcdu) { static const unsigned int mmio_offsets[] = { DU0_REG_OFFSET, DU2_REG_OFFSET }; struct drm_device *dev = rcdu->ddev; struct drm_encoder *encoder; struct drm_fbdev_cma *fbdev; unsigned int num_encoders; unsigned int num_groups; unsigned int i; int ret; drm_mode_config_init(dev); dev->mode_config.min_width = 0; dev->mode_config.min_height = 0; dev->mode_config.max_width = 4095; dev->mode_config.max_height = 2047; dev->mode_config.funcs = &rcar_du_mode_config_funcs; rcdu->num_crtcs = rcdu->info->num_crtcs; ret = rcar_du_properties_init(rcdu); if (ret < 0) return ret; /* Initialize the groups. */ num_groups = DIV_ROUND_UP(rcdu->num_crtcs, 2); for (i = 0; i < num_groups; ++i) { struct rcar_du_group *rgrp = &rcdu->groups[i]; mutex_init(&rgrp->lock); rgrp->dev = rcdu; rgrp->mmio_offset = mmio_offsets[i]; rgrp->index = i; rgrp->num_crtcs = min(rcdu->num_crtcs - 2 * i, 2U); /* If we have more than one CRTCs in this group pre-associate * planes 0-3 with CRTC 0 and planes 4-7 with CRTC 1 to minimize * flicker occurring when the association is changed. */ rgrp->dptsr_planes = rgrp->num_crtcs > 1 ? 0xf0 : 0; ret = rcar_du_planes_init(rgrp); if (ret < 0) return ret; } /* Create the CRTCs. */ for (i = 0; i < rcdu->num_crtcs; ++i) { struct rcar_du_group *rgrp = &rcdu->groups[i / 2]; ret = rcar_du_crtc_create(rgrp, i); if (ret < 0) return ret; } /* Initialize the encoders. */ ret = rcar_du_lvdsenc_init(rcdu); if (ret < 0) return ret; ret = rcar_du_encoders_init(rcdu); if (ret < 0) return ret; if (ret == 0) { dev_err(rcdu->dev, "error: no encoder could be initialized\n"); return -EINVAL; } num_encoders = ret; /* Set the possible CRTCs and possible clones. There's always at least * one way for all encoders to clone each other, set all bits in the * possible clones field. */ list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { struct rcar_du_encoder *renc = to_rcar_encoder(encoder); const struct rcar_du_output_routing *route = &rcdu->info->routes[renc->output]; encoder->possible_crtcs = route->possible_crtcs; encoder->possible_clones = (1 << num_encoders) - 1; } drm_mode_config_reset(dev); drm_kms_helper_poll_init(dev); if (dev->mode_config.num_connector) { fbdev = drm_fbdev_cma_init(dev, 32, dev->mode_config.num_crtc, dev->mode_config.num_connector); if (IS_ERR(fbdev)) return PTR_ERR(fbdev); rcdu->fbdev = fbdev; } else { dev_info(rcdu->dev, "no connector found, disabling fbdev emulation\n"); } return 0; }