diff options
Diffstat (limited to 'drivers/gpu/drm/rcar-du/rcar_du_kms.c')
| -rw-r--r-- | drivers/gpu/drm/rcar-du/rcar_du_kms.c | 747 |
1 files changed, 747 insertions, 0 deletions
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c new file mode 100644 index 000000000..93117f159 --- /dev/null +++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c @@ -0,0 +1,747 @@ +/* + * 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 <drm/drmP.h> +#include <drm/drm_atomic.h> +#include <drm/drm_atomic_helper.h> +#include <drm/drm_crtc.h> +#include <drm/drm_crtc_helper.h> +#include <drm/drm_fb_cma_helper.h> +#include <drm/drm_gem_cma_helper.h> + +#include <linux/of_graph.h> +#include <linux/wait.h> + +#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_du_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_du_plane_state(state->plane_states[i]); + + /* 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) { + index = plane - plane->group->planes.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)) { + groups |= 1 << plane->group->index; + needs_realloc = true; + + index = plane - plane->group->planes.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; + + for (i = 0; i < RCAR_DU_NUM_KMS_PLANES; ++i) { + struct rcar_du_plane *plane = &group->planes.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)) + continue; + + plane_state = to_rcar_du_plane_state(plane->plane.state); + used_planes |= rcar_du_plane_hwmask(plane_state); + } + + group_free_planes[index] = 0xff & ~used_planes; + groups &= ~(1 << 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; + int idx; + + if (!state->planes[i]) + continue; + + plane = to_rcar_plane(state->planes[i]); + plane_state = to_rcar_du_plane_state(state->plane_states[i]); + + /* 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; + + idx = rcar_du_plane_hwalloc(plane_state->format->planes, + group_free_planes[plane->group->index]); + if (idx < 0) { + dev_dbg(rcdu->dev, "%s: no available hardware plane\n", + __func__); + return idx; + } + + plane_state->hwindex = idx; + + group_free_planes[plane->group->index] &= + ~rcar_du_plane_hwmask(plane_state); + } + + 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) + return -ENOMEM; + + 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); + return ret; + } + + /* 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; +} + +/* ----------------------------------------------------------------------------- + * 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 0; + } + + 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 0; + } + + 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 0; + } + } 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); + + return ret < 0 ? ret : 1; +} + +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; + } + + dev_info(rcdu->dev, + "encoder initialization failed, skipping\n"); + continue; + } + + num_encoders += ret; + } + + return num_encoders; +} + +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; + + /* 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; + + 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; +} |