diff options
Diffstat (limited to 'drivers/gpu/drm/gud/gud_connector.c')
| -rw-r--r-- | drivers/gpu/drm/gud/gud_connector.c | 729 |
1 files changed, 729 insertions, 0 deletions
diff --git a/drivers/gpu/drm/gud/gud_connector.c b/drivers/gpu/drm/gud/gud_connector.c new file mode 100644 index 000000000000..ec495dcd6122 --- /dev/null +++ b/drivers/gpu/drm/gud/gud_connector.c @@ -0,0 +1,729 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright 2020 Noralf Trønnes + */ + +#include <linux/backlight.h> +#include <linux/workqueue.h> + +#include <drm/drm_atomic.h> +#include <drm/drm_atomic_state_helper.h> +#include <drm/drm_connector.h> +#include <drm/drm_drv.h> +#include <drm/drm_encoder.h> +#include <drm/drm_file.h> +#include <drm/drm_modeset_helper_vtables.h> +#include <drm/drm_print.h> +#include <drm/drm_probe_helper.h> +#include <drm/drm_simple_kms_helper.h> +#include <drm/gud.h> + +#include "gud_internal.h" + +struct gud_connector { + struct drm_connector connector; + struct drm_encoder encoder; + struct backlight_device *backlight; + struct work_struct backlight_work; + + /* Supported properties */ + u16 *properties; + unsigned int num_properties; + + /* Initial gadget tv state if applicable, applied on state reset */ + struct drm_tv_connector_state initial_tv_state; + + /* + * Initial gadget backlight brightness if applicable, applied on state reset. + * The value -ENODEV is used to signal no backlight. + */ + int initial_brightness; +}; + +static inline struct gud_connector *to_gud_connector(struct drm_connector *connector) +{ + return container_of(connector, struct gud_connector, connector); +} + +static void gud_conn_err(struct drm_connector *connector, const char *msg, int ret) +{ + dev_err(connector->dev->dev, "%s: %s (ret=%d)\n", connector->name, msg, ret); +} + +/* + * Use a worker to avoid taking kms locks inside the backlight lock. + * Other display drivers use backlight within their kms locks. + * This avoids inconsistent locking rules, which would upset lockdep. + */ +static void gud_connector_backlight_update_status_work(struct work_struct *work) +{ + struct gud_connector *gconn = container_of(work, struct gud_connector, backlight_work); + struct drm_connector *connector = &gconn->connector; + struct drm_connector_state *connector_state; + struct drm_device *drm = connector->dev; + struct drm_modeset_acquire_ctx ctx; + struct drm_atomic_state *state; + int idx, ret; + + if (!drm_dev_enter(drm, &idx)) + return; + + state = drm_atomic_state_alloc(drm); + if (!state) { + ret = -ENOMEM; + goto exit; + } + + drm_modeset_acquire_init(&ctx, 0); + state->acquire_ctx = &ctx; +retry: + connector_state = drm_atomic_get_connector_state(state, connector); + if (IS_ERR(connector_state)) { + ret = PTR_ERR(connector_state); + goto out; + } + + /* Reuse tv.brightness to avoid having to subclass */ + connector_state->tv.brightness = gconn->backlight->props.brightness; + + ret = drm_atomic_commit(state); +out: + if (ret == -EDEADLK) { + drm_atomic_state_clear(state); + drm_modeset_backoff(&ctx); + goto retry; + } + + drm_atomic_state_put(state); + + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); +exit: + drm_dev_exit(idx); + + if (ret) + dev_err(drm->dev, "Failed to update backlight, err=%d\n", ret); +} + +static int gud_connector_backlight_update_status(struct backlight_device *bd) +{ + struct drm_connector *connector = bl_get_data(bd); + struct gud_connector *gconn = to_gud_connector(connector); + + /* The USB timeout is 5 seconds so use system_long_wq for worst case scenario */ + queue_work(system_long_wq, &gconn->backlight_work); + + return 0; +} + +static const struct backlight_ops gud_connector_backlight_ops = { + .update_status = gud_connector_backlight_update_status, +}; + +static int gud_connector_backlight_register(struct gud_connector *gconn) +{ + struct drm_connector *connector = &gconn->connector; + struct backlight_device *bd; + const char *name; + const struct backlight_properties props = { + .type = BACKLIGHT_RAW, + .scale = BACKLIGHT_SCALE_NON_LINEAR, + .max_brightness = 100, + .brightness = gconn->initial_brightness, + }; + + name = kasprintf(GFP_KERNEL, "card%d-%s-backlight", + connector->dev->primary->index, connector->name); + if (!name) + return -ENOMEM; + + bd = backlight_device_register(name, connector->kdev, connector, + &gud_connector_backlight_ops, &props); + kfree(name); + if (IS_ERR(bd)) + return PTR_ERR(bd); + + gconn->backlight = bd; + + return 0; +} + +static int gud_connector_detect(struct drm_connector *connector, + struct drm_modeset_acquire_ctx *ctx, bool force) +{ + struct gud_device *gdrm = to_gud_device(connector->dev); + int idx, ret; + u8 status; + + if (!drm_dev_enter(connector->dev, &idx)) + return connector_status_disconnected; + + if (force) { + ret = gud_usb_set(gdrm, GUD_REQ_SET_CONNECTOR_FORCE_DETECT, + connector->index, NULL, 0); + if (ret) { + ret = connector_status_unknown; + goto exit; + } + } + + ret = gud_usb_get_u8(gdrm, GUD_REQ_GET_CONNECTOR_STATUS, connector->index, &status); + if (ret) { + ret = connector_status_unknown; + goto exit; + } + + switch (status & GUD_CONNECTOR_STATUS_CONNECTED_MASK) { + case GUD_CONNECTOR_STATUS_DISCONNECTED: + ret = connector_status_disconnected; + break; + case GUD_CONNECTOR_STATUS_CONNECTED: + ret = connector_status_connected; + break; + default: + ret = connector_status_unknown; + break; + }; + + if (status & GUD_CONNECTOR_STATUS_CHANGED) + connector->epoch_counter += 1; +exit: + drm_dev_exit(idx); + + return ret; +} + +struct gud_connector_get_edid_ctx { + void *buf; + size_t len; + bool edid_override; +}; + +static int gud_connector_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len) +{ + struct gud_connector_get_edid_ctx *ctx = data; + size_t start = block * EDID_LENGTH; + + ctx->edid_override = false; + + if (start + len > ctx->len) + return -1; + + memcpy(buf, ctx->buf + start, len); + + return 0; +} + +static int gud_connector_get_modes(struct drm_connector *connector) +{ + struct gud_device *gdrm = to_gud_device(connector->dev); + struct gud_display_mode_req *reqmodes = NULL; + struct gud_connector_get_edid_ctx edid_ctx; + unsigned int i, num_modes = 0; + struct edid *edid = NULL; + int idx, ret; + + if (!drm_dev_enter(connector->dev, &idx)) + return 0; + + edid_ctx.edid_override = true; + edid_ctx.buf = kmalloc(GUD_CONNECTOR_MAX_EDID_LEN, GFP_KERNEL); + if (!edid_ctx.buf) + goto out; + + ret = gud_usb_get(gdrm, GUD_REQ_GET_CONNECTOR_EDID, connector->index, + edid_ctx.buf, GUD_CONNECTOR_MAX_EDID_LEN); + if (ret > 0 && ret % EDID_LENGTH) { + gud_conn_err(connector, "Invalid EDID size", ret); + } else if (ret > 0) { + edid_ctx.len = ret; + edid = drm_do_get_edid(connector, gud_connector_get_edid_block, &edid_ctx); + } + + kfree(edid_ctx.buf); + drm_connector_update_edid_property(connector, edid); + + if (edid && edid_ctx.edid_override) + goto out; + + reqmodes = kmalloc_array(GUD_CONNECTOR_MAX_NUM_MODES, sizeof(*reqmodes), GFP_KERNEL); + if (!reqmodes) + goto out; + + ret = gud_usb_get(gdrm, GUD_REQ_GET_CONNECTOR_MODES, connector->index, + reqmodes, GUD_CONNECTOR_MAX_NUM_MODES * sizeof(*reqmodes)); + if (ret <= 0) + goto out; + if (ret % sizeof(*reqmodes)) { + gud_conn_err(connector, "Invalid display mode array size", ret); + goto out; + } + + num_modes = ret / sizeof(*reqmodes); + + for (i = 0; i < num_modes; i++) { + struct drm_display_mode *mode; + + mode = drm_mode_create(connector->dev); + if (!mode) { + num_modes = i; + goto out; + } + + gud_to_display_mode(mode, &reqmodes[i]); + drm_mode_probed_add(connector, mode); + } +out: + if (!num_modes) + num_modes = drm_add_edid_modes(connector, edid); + + kfree(reqmodes); + kfree(edid); + drm_dev_exit(idx); + + return num_modes; +} + +static int gud_connector_atomic_check(struct drm_connector *connector, + struct drm_atomic_state *state) +{ + struct drm_connector_state *new_state; + struct drm_crtc_state *new_crtc_state; + struct drm_connector_state *old_state; + + new_state = drm_atomic_get_new_connector_state(state, connector); + if (!new_state->crtc) + return 0; + + old_state = drm_atomic_get_old_connector_state(state, connector); + new_crtc_state = drm_atomic_get_new_crtc_state(state, new_state->crtc); + + if (old_state->tv.margins.left != new_state->tv.margins.left || + old_state->tv.margins.right != new_state->tv.margins.right || + old_state->tv.margins.top != new_state->tv.margins.top || + old_state->tv.margins.bottom != new_state->tv.margins.bottom || + old_state->tv.mode != new_state->tv.mode || + old_state->tv.brightness != new_state->tv.brightness || + old_state->tv.contrast != new_state->tv.contrast || + old_state->tv.flicker_reduction != new_state->tv.flicker_reduction || + old_state->tv.overscan != new_state->tv.overscan || + old_state->tv.saturation != new_state->tv.saturation || + old_state->tv.hue != new_state->tv.hue) + new_crtc_state->connectors_changed = true; + + return 0; +} + +static const struct drm_connector_helper_funcs gud_connector_helper_funcs = { + .detect_ctx = gud_connector_detect, + .get_modes = gud_connector_get_modes, + .atomic_check = gud_connector_atomic_check, +}; + +static int gud_connector_late_register(struct drm_connector *connector) +{ + struct gud_connector *gconn = to_gud_connector(connector); + + if (gconn->initial_brightness < 0) + return 0; + + return gud_connector_backlight_register(gconn); +} + +static void gud_connector_early_unregister(struct drm_connector *connector) +{ + struct gud_connector *gconn = to_gud_connector(connector); + + backlight_device_unregister(gconn->backlight); + cancel_work_sync(&gconn->backlight_work); +} + +static void gud_connector_destroy(struct drm_connector *connector) +{ + struct gud_connector *gconn = to_gud_connector(connector); + + drm_connector_cleanup(connector); + kfree(gconn->properties); + kfree(gconn); +} + +static void gud_connector_reset(struct drm_connector *connector) +{ + struct gud_connector *gconn = to_gud_connector(connector); + + drm_atomic_helper_connector_reset(connector); + connector->state->tv = gconn->initial_tv_state; + /* Set margins from command line */ + drm_atomic_helper_connector_tv_reset(connector); + if (gconn->initial_brightness >= 0) + connector->state->tv.brightness = gconn->initial_brightness; +} + +static const struct drm_connector_funcs gud_connector_funcs = { + .fill_modes = drm_helper_probe_single_connector_modes, + .late_register = gud_connector_late_register, + .early_unregister = gud_connector_early_unregister, + .destroy = gud_connector_destroy, + .reset = gud_connector_reset, + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, +}; + +/* + * The tv.mode property is shared among the connectors and its enum names are + * driver specific. This means that if more than one connector uses tv.mode, + * the enum names has to be the same. + */ +static int gud_connector_add_tv_mode(struct gud_device *gdrm, struct drm_connector *connector) +{ + size_t buf_len = GUD_CONNECTOR_TV_MODE_MAX_NUM * GUD_CONNECTOR_TV_MODE_NAME_LEN; + const char *modes[GUD_CONNECTOR_TV_MODE_MAX_NUM]; + unsigned int i, num_modes; + char *buf; + int ret; + + buf = kmalloc(buf_len, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + ret = gud_usb_get(gdrm, GUD_REQ_GET_CONNECTOR_TV_MODE_VALUES, + connector->index, buf, buf_len); + if (ret < 0) + goto free; + if (!ret || ret % GUD_CONNECTOR_TV_MODE_NAME_LEN) { + ret = -EIO; + goto free; + } + + num_modes = ret / GUD_CONNECTOR_TV_MODE_NAME_LEN; + for (i = 0; i < num_modes; i++) + modes[i] = &buf[i * GUD_CONNECTOR_TV_MODE_NAME_LEN]; + + ret = drm_mode_create_tv_properties(connector->dev, num_modes, modes); +free: + kfree(buf); + if (ret < 0) + gud_conn_err(connector, "Failed to add TV modes", ret); + + return ret; +} + +static struct drm_property * +gud_connector_property_lookup(struct drm_connector *connector, u16 prop) +{ + struct drm_mode_config *config = &connector->dev->mode_config; + + switch (prop) { + case GUD_PROPERTY_TV_LEFT_MARGIN: + return config->tv_left_margin_property; + case GUD_PROPERTY_TV_RIGHT_MARGIN: + return config->tv_right_margin_property; + case GUD_PROPERTY_TV_TOP_MARGIN: + return config->tv_top_margin_property; + case GUD_PROPERTY_TV_BOTTOM_MARGIN: + return config->tv_bottom_margin_property; + case GUD_PROPERTY_TV_MODE: + return config->tv_mode_property; + case GUD_PROPERTY_TV_BRIGHTNESS: + return config->tv_brightness_property; + case GUD_PROPERTY_TV_CONTRAST: + return config->tv_contrast_property; + case GUD_PROPERTY_TV_FLICKER_REDUCTION: + return config->tv_flicker_reduction_property; + case GUD_PROPERTY_TV_OVERSCAN: + return config->tv_overscan_property; + case GUD_PROPERTY_TV_SATURATION: + return config->tv_saturation_property; + case GUD_PROPERTY_TV_HUE: + return config->tv_hue_property; + default: + return ERR_PTR(-EINVAL); + } +} + +static unsigned int *gud_connector_tv_state_val(u16 prop, struct drm_tv_connector_state *state) +{ + switch (prop) { + case GUD_PROPERTY_TV_LEFT_MARGIN: + return &state->margins.left; + case GUD_PROPERTY_TV_RIGHT_MARGIN: + return &state->margins.right; + case GUD_PROPERTY_TV_TOP_MARGIN: + return &state->margins.top; + case GUD_PROPERTY_TV_BOTTOM_MARGIN: + return &state->margins.bottom; + case GUD_PROPERTY_TV_MODE: + return &state->mode; + case GUD_PROPERTY_TV_BRIGHTNESS: + return &state->brightness; + case GUD_PROPERTY_TV_CONTRAST: + return &state->contrast; + case GUD_PROPERTY_TV_FLICKER_REDUCTION: + return &state->flicker_reduction; + case GUD_PROPERTY_TV_OVERSCAN: + return &state->overscan; + case GUD_PROPERTY_TV_SATURATION: + return &state->saturation; + case GUD_PROPERTY_TV_HUE: + return &state->hue; + default: + return ERR_PTR(-EINVAL); + } +} + +static int gud_connector_add_properties(struct gud_device *gdrm, struct gud_connector *gconn) +{ + struct drm_connector *connector = &gconn->connector; + struct drm_device *drm = &gdrm->drm; + struct gud_property_req *properties; + unsigned int i, num_properties; + int ret; + + properties = kcalloc(GUD_CONNECTOR_PROPERTIES_MAX_NUM, sizeof(*properties), GFP_KERNEL); + if (!properties) + return -ENOMEM; + + ret = gud_usb_get(gdrm, GUD_REQ_GET_CONNECTOR_PROPERTIES, connector->index, + properties, GUD_CONNECTOR_PROPERTIES_MAX_NUM * sizeof(*properties)); + if (ret <= 0) + goto out; + if (ret % sizeof(*properties)) { + ret = -EIO; + goto out; + } + + num_properties = ret / sizeof(*properties); + ret = 0; + + gconn->properties = kcalloc(num_properties, sizeof(*gconn->properties), GFP_KERNEL); + if (!gconn->properties) { + ret = -ENOMEM; + goto out; + } + + for (i = 0; i < num_properties; i++) { + u16 prop = le16_to_cpu(properties[i].prop); + u64 val = le64_to_cpu(properties[i].val); + struct drm_property *property; + unsigned int *state_val; + + drm_dbg(drm, "property: %u = %llu(0x%llx)\n", prop, val, val); + + switch (prop) { + case GUD_PROPERTY_TV_LEFT_MARGIN: + fallthrough; + case GUD_PROPERTY_TV_RIGHT_MARGIN: + fallthrough; + case GUD_PROPERTY_TV_TOP_MARGIN: + fallthrough; + case GUD_PROPERTY_TV_BOTTOM_MARGIN: + ret = drm_mode_create_tv_margin_properties(drm); + if (ret) + goto out; + break; + case GUD_PROPERTY_TV_MODE: + ret = gud_connector_add_tv_mode(gdrm, connector); + if (ret) + goto out; + break; + case GUD_PROPERTY_TV_BRIGHTNESS: + fallthrough; + case GUD_PROPERTY_TV_CONTRAST: + fallthrough; + case GUD_PROPERTY_TV_FLICKER_REDUCTION: + fallthrough; + case GUD_PROPERTY_TV_OVERSCAN: + fallthrough; + case GUD_PROPERTY_TV_SATURATION: + fallthrough; + case GUD_PROPERTY_TV_HUE: + /* This is a no-op if already added. */ + ret = drm_mode_create_tv_properties(drm, 0, NULL); + if (ret) + goto out; + break; + case GUD_PROPERTY_BACKLIGHT_BRIGHTNESS: + if (val > 100) { + ret = -EINVAL; + goto out; + } + gconn->initial_brightness = val; + break; + default: + /* New ones might show up in future devices, skip those we don't know. */ + drm_dbg(drm, "Ignoring unknown property: %u\n", prop); + continue; + } + + gconn->properties[gconn->num_properties++] = prop; + + if (prop == GUD_PROPERTY_BACKLIGHT_BRIGHTNESS) + continue; /* not a DRM property */ + + property = gud_connector_property_lookup(connector, prop); + if (WARN_ON(IS_ERR(property))) + continue; + + state_val = gud_connector_tv_state_val(prop, &gconn->initial_tv_state); + if (WARN_ON(IS_ERR(state_val))) + continue; + + *state_val = val; + drm_object_attach_property(&connector->base, property, 0); + } +out: + kfree(properties); + + return ret; +} + +int gud_connector_fill_properties(struct drm_connector_state *connector_state, + struct gud_property_req *properties) +{ + struct gud_connector *gconn = to_gud_connector(connector_state->connector); + unsigned int i; + + for (i = 0; i < gconn->num_properties; i++) { + u16 prop = gconn->properties[i]; + u64 val; + + if (prop == GUD_PROPERTY_BACKLIGHT_BRIGHTNESS) { + val = connector_state->tv.brightness; + } else { + unsigned int *state_val; + + state_val = gud_connector_tv_state_val(prop, &connector_state->tv); + if (WARN_ON_ONCE(IS_ERR(state_val))) + return PTR_ERR(state_val); + + val = *state_val; + } + + properties[i].prop = cpu_to_le16(prop); + properties[i].val = cpu_to_le64(val); + } + + return gconn->num_properties; +} + +static int gud_connector_create(struct gud_device *gdrm, unsigned int index, + struct gud_connector_descriptor_req *desc) +{ + struct drm_device *drm = &gdrm->drm; + struct gud_connector *gconn; + struct drm_connector *connector; + struct drm_encoder *encoder; + int ret, connector_type; + u32 flags; + + gconn = kzalloc(sizeof(*gconn), GFP_KERNEL); + if (!gconn) + return -ENOMEM; + + INIT_WORK(&gconn->backlight_work, gud_connector_backlight_update_status_work); + gconn->initial_brightness = -ENODEV; + flags = le32_to_cpu(desc->flags); + connector = &gconn->connector; + + drm_dbg(drm, "Connector: index=%u type=%u flags=0x%x\n", index, desc->connector_type, flags); + + switch (desc->connector_type) { + case GUD_CONNECTOR_TYPE_PANEL: + connector_type = DRM_MODE_CONNECTOR_USB; + break; + case GUD_CONNECTOR_TYPE_VGA: + connector_type = DRM_MODE_CONNECTOR_VGA; + break; + case GUD_CONNECTOR_TYPE_DVI: + connector_type = DRM_MODE_CONNECTOR_DVID; + break; + case GUD_CONNECTOR_TYPE_COMPOSITE: + connector_type = DRM_MODE_CONNECTOR_Composite; + break; + case GUD_CONNECTOR_TYPE_SVIDEO: + connector_type = DRM_MODE_CONNECTOR_SVIDEO; + break; + case GUD_CONNECTOR_TYPE_COMPONENT: + connector_type = DRM_MODE_CONNECTOR_Component; + break; + case GUD_CONNECTOR_TYPE_DISPLAYPORT: + connector_type = DRM_MODE_CONNECTOR_DisplayPort; + break; + case GUD_CONNECTOR_TYPE_HDMI: + connector_type = DRM_MODE_CONNECTOR_HDMIA; + break; + default: /* future types */ + connector_type = DRM_MODE_CONNECTOR_USB; + break; + }; + + drm_connector_helper_add(connector, &gud_connector_helper_funcs); + ret = drm_connector_init(drm, connector, &gud_connector_funcs, connector_type); + if (ret) { + kfree(connector); + return ret; + } + + if (WARN_ON(connector->index != index)) + return -EINVAL; + + if (flags & GUD_CONNECTOR_FLAGS_POLL_STATUS) + connector->polled = (DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT); + if (flags & GUD_CONNECTOR_FLAGS_INTERLACE) + connector->interlace_allowed = true; + if (flags & GUD_CONNECTOR_FLAGS_DOUBLESCAN) + connector->doublescan_allowed = true; + + ret = gud_connector_add_properties(gdrm, gconn); + if (ret) { + gud_conn_err(connector, "Failed to add properties", ret); + return ret; + } + + /* The first connector is attached to the existing simple pipe encoder */ + if (!connector->index) { + encoder = &gdrm->pipe.encoder; + } else { + encoder = &gconn->encoder; + + ret = drm_simple_encoder_init(drm, encoder, DRM_MODE_ENCODER_NONE); + if (ret) + return ret; + + encoder->possible_crtcs = 1; + } + + return drm_connector_attach_encoder(connector, encoder); +} + +int gud_get_connectors(struct gud_device *gdrm) +{ + struct gud_connector_descriptor_req *descs; + unsigned int i, num_connectors; + int ret; + + descs = kmalloc_array(GUD_CONNECTORS_MAX_NUM, sizeof(*descs), GFP_KERNEL); + if (!descs) + return -ENOMEM; + + ret = gud_usb_get(gdrm, GUD_REQ_GET_CONNECTORS, 0, + descs, GUD_CONNECTORS_MAX_NUM * sizeof(descs)); + if (ret < 0) + goto free; + if (!ret || ret % sizeof(*descs)) { + ret = -EIO; + goto free; + } + + num_connectors = ret / sizeof(*descs); + + for (i = 0; i < num_connectors; i++) { + ret = gud_connector_create(gdrm, i, &descs[i]); + if (ret) + goto free; + } +free: + kfree(descs); + + return ret; +} |