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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#include <linux/export.h>
#include <drm/drm_bridge.h>#include <drm/drm_device.h>#include <drm/drm_drv.h>#include <drm/drm_encoder.h>#include <drm/drm_managed.h>#include <drm/drm_print.h>
#include "drm_crtc_internal.h"#include "drm_internal.h"
/** * DOC: overview * * Encoders represent the connecting element between the CRTC (as the overall * pixel pipeline, represented by &struct drm_crtc) and the connectors (as the * generic sink entity, represented by &struct drm_connector). An encoder takes * pixel data from a CRTC and converts it to a format suitable for any attached * connector. Encoders are objects exposed to userspace, originally to allow * userspace to infer cloning and connector/CRTC restrictions. Unfortunately * almost all drivers get this wrong, making the uabi pretty much useless. On * top of that the exposed restrictions are too simple for today's hardware, and * the recommended way to infer restrictions is by using the * DRM_MODE_ATOMIC_TEST_ONLY flag for the atomic IOCTL. * * Otherwise encoders aren't used in the uapi at all (any modeset request from * userspace directly connects a connector with a CRTC), drivers are therefore * free to use them however they wish. Modeset helper libraries make strong use * of encoders to facilitate code sharing. But for more complex settings it is * usually better to move shared code into a separate &drm_bridge. Compared to * encoders, bridges also have the benefit of being purely an internal * abstraction since they are not exposed to userspace at all. * * Encoders are initialized with drm_encoder_init() and cleaned up using * drm_encoder_cleanup(). */static const struct drm_prop_enum_list drm_encoder_enum_list[] = { { DRM_MODE_ENCODER_NONE, "None" }, { DRM_MODE_ENCODER_DAC, "DAC" }, { DRM_MODE_ENCODER_TMDS, "TMDS" }, { DRM_MODE_ENCODER_LVDS, "LVDS" }, { DRM_MODE_ENCODER_TVDAC, "TV" }, { DRM_MODE_ENCODER_VIRTUAL, "Virtual" }, { DRM_MODE_ENCODER_DSI, "DSI" }, { DRM_MODE_ENCODER_DPMST, "DP MST" }, { DRM_MODE_ENCODER_DPI, "DPI" },};
int drm_encoder_register_all(struct drm_device *dev){ struct drm_encoder *encoder; int ret = 0;
drm_for_each_encoder(encoder, dev) { drm_debugfs_encoder_add(encoder);
if (encoder->funcs && encoder->funcs->late_register) ret = encoder->funcs->late_register(encoder); if (ret) return ret; }
return 0;}
void drm_encoder_unregister_all(struct drm_device *dev){ struct drm_encoder *encoder;
drm_for_each_encoder(encoder, dev) { if (encoder->funcs && encoder->funcs->early_unregister) encoder->funcs->early_unregister(encoder); drm_debugfs_encoder_remove(encoder); }}
__printf(5, 0)static int __drm_encoder_init(struct drm_device *dev, struct drm_encoder *encoder, const struct drm_encoder_funcs *funcs, int encoder_type, const char *name, va_list ap){ int ret;
/* encoder index is used with 32bit bitmasks */ if (WARN_ON(dev->mode_config.num_encoder >= 32)) return -EINVAL;
ret = drm_mode_object_add(dev, &encoder->base, DRM_MODE_OBJECT_ENCODER); if (ret) return ret;
encoder->dev = dev; encoder->encoder_type = encoder_type; encoder->funcs = funcs; if (name) { encoder->name = kvasprintf(GFP_KERNEL, name, ap); } else { encoder->name = kasprintf(GFP_KERNEL, "%s-%d", drm_encoder_enum_list[encoder_type].name, encoder->base.id); } if (!encoder->name) { ret = -ENOMEM; goto out_put; }
INIT_LIST_HEAD(&encoder->bridge_chain); mutex_init(&encoder->bridge_chain_mutex); list_add_tail(&encoder->head, &dev->mode_config.encoder_list); encoder->index = dev->mode_config.num_encoder++;
out_put: if (ret) drm_mode_object_unregister(dev, &encoder->base);
return ret;}
/** * drm_encoder_init - Init a preallocated encoder * @dev: drm device * @encoder: the encoder to init * @funcs: callbacks for this encoder * @encoder_type: user visible type of the encoder * @name: printf style format string for the encoder name, or NULL for default name * * Initializes a preallocated encoder. Encoder should be subclassed as part of * driver encoder objects. At driver unload time the driver's * &drm_encoder_funcs.destroy hook should call drm_encoder_cleanup() and kfree() * the encoder structure. The encoder structure should not be allocated with * devm_kzalloc(). * * Note: consider using drmm_encoder_alloc() or drmm_encoder_init() * instead of drm_encoder_init() to let the DRM managed resource * infrastructure take care of cleanup and deallocation. * * Returns: * Zero on success, error code on failure. */int drm_encoder_init(struct drm_device *dev, struct drm_encoder *encoder, const struct drm_encoder_funcs *funcs, int encoder_type, const char *name, ...){ va_list ap; int ret;
WARN_ON(!funcs->destroy);
va_start(ap, name); ret = __drm_encoder_init(dev, encoder, funcs, encoder_type, name, ap); va_end(ap);
return ret;}EXPORT_SYMBOL(drm_encoder_init);
/** * drm_encoder_cleanup - cleans up an initialised encoder * @encoder: encoder to cleanup * * Cleans up the encoder but doesn't free the object. */void drm_encoder_cleanup(struct drm_encoder *encoder){ struct drm_device *dev = encoder->dev; struct drm_bridge *bridge, *next; LIST_HEAD(tmplist);
/* Note that the encoder_list is considered to be static; should we * remove the drm_encoder at runtime we would have to decrement all * the indices on the drm_encoder after us in the encoder_list. */
/* * We need the bridge_chain_mutex to modify the chain, but * drm_bridge_detach() will call DRM_MODESET_LOCK_ALL_BEGIN() (in * drm_modeset_lock_fini()), resulting in a possible ABBA circular * deadlock. Avoid it by first moving all the bridges to a * temporary list holding the lock, and then calling * drm_bridge_detach() without the lock. */ mutex_lock(&encoder->bridge_chain_mutex); list_cut_before(&tmplist, &encoder->bridge_chain, &encoder->bridge_chain); mutex_unlock(&encoder->bridge_chain_mutex);
list_for_each_entry_safe(bridge, next, &tmplist, chain_node) drm_bridge_detach(bridge);
drm_mode_object_unregister(dev, &encoder->base); kfree(encoder->name); list_del(&encoder->head); dev->mode_config.num_encoder--; mutex_destroy(&encoder->bridge_chain_mutex);
memset(encoder, 0, sizeof(*encoder));}EXPORT_SYMBOL(drm_encoder_cleanup);
static void drmm_encoder_alloc_release(struct drm_device *dev, void *ptr){ struct drm_encoder *encoder = ptr;
if (WARN_ON(!encoder->dev)) return;
drm_encoder_cleanup(encoder);}
__printf(5, 0)static int __drmm_encoder_init(struct drm_device *dev, struct drm_encoder *encoder, const struct drm_encoder_funcs *funcs, int encoder_type, const char *name, va_list args){ int ret;
if (drm_WARN_ON(dev, funcs && funcs->destroy)) return -EINVAL;
ret = __drm_encoder_init(dev, encoder, funcs, encoder_type, name, args); if (ret) return ret;
ret = drmm_add_action_or_reset(dev, drmm_encoder_alloc_release, encoder); if (ret) return ret;
return 0;}
void *__drmm_encoder_alloc(struct drm_device *dev, size_t size, size_t offset, const struct drm_encoder_funcs *funcs, int encoder_type, const char *name, ...){ void *container; struct drm_encoder *encoder; va_list ap; int ret;
container = drmm_kzalloc(dev, size, GFP_KERNEL); if (!container) return ERR_PTR(-ENOMEM);
encoder = container + offset;
va_start(ap, name); ret = __drmm_encoder_init(dev, encoder, funcs, encoder_type, name, ap); va_end(ap); if (ret) return ERR_PTR(ret);
return container;}EXPORT_SYMBOL(__drmm_encoder_alloc);
/** * drmm_encoder_init - Initialize a preallocated encoder * @dev: drm device * @encoder: the encoder to init * @funcs: callbacks for this encoder (optional) * @encoder_type: user visible type of the encoder * @name: printf style format string for the encoder name, or NULL for default name * * Initializes a preallocated encoder. Encoder should be subclassed as * part of driver encoder objects. Cleanup is automatically handled * through registering drm_encoder_cleanup() with drmm_add_action(). The * encoder structure should be allocated with drmm_kzalloc(). * * The @drm_encoder_funcs.destroy hook must be NULL. * * Returns: * Zero on success, error code on failure. */int drmm_encoder_init(struct drm_device *dev, struct drm_encoder *encoder, const struct drm_encoder_funcs *funcs, int encoder_type, const char *name, ...){ va_list ap; int ret;
va_start(ap, name); ret = __drmm_encoder_init(dev, encoder, funcs, encoder_type, name, ap); va_end(ap); if (ret) return ret;
return 0;}EXPORT_SYMBOL(drmm_encoder_init);
static struct drm_crtc *drm_encoder_get_crtc(struct drm_encoder *encoder){ struct drm_connector *connector; struct drm_device *dev = encoder->dev; bool uses_atomic = false; struct drm_connector_list_iter conn_iter;
/* For atomic drivers only state objects are synchronously updated and * protected by modeset locks, so check those first. */ drm_connector_list_iter_begin(dev, &conn_iter); drm_for_each_connector_iter(connector, &conn_iter) { if (!connector->state) continue;
uses_atomic = true;
if (connector->state->best_encoder != encoder) continue;
drm_connector_list_iter_end(&conn_iter); return connector->state->crtc; } drm_connector_list_iter_end(&conn_iter);
/* Don't return stale data (e.g. pending async disable). */ if (uses_atomic) return NULL;
return encoder->crtc;}
int drm_mode_getencoder(struct drm_device *dev, void *data, struct drm_file *file_priv){ struct drm_mode_get_encoder *enc_resp = data; struct drm_encoder *encoder; struct drm_crtc *crtc;
if (!drm_core_check_feature(dev, DRIVER_MODESET)) return -EOPNOTSUPP;
encoder = drm_encoder_find(dev, file_priv, enc_resp->encoder_id); if (!encoder) return -ENOENT;
drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); crtc = drm_encoder_get_crtc(encoder); if (crtc && drm_lease_held(file_priv, crtc->base.id)) enc_resp->crtc_id = crtc->base.id; else enc_resp->crtc_id = 0; drm_modeset_unlock(&dev->mode_config.connection_mutex);
enc_resp->encoder_type = encoder->encoder_type; enc_resp->encoder_id = encoder->base.id; enc_resp->possible_crtcs = drm_lease_filter_crtcs(file_priv, encoder->possible_crtcs); enc_resp->possible_clones = encoder->possible_clones;
return 0;}