drmresources.cpp - platform/external/drm_hwcomposer - Git at Google

 /*
  * Copyright (C) 2015 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #define LOG_TAG "hwc-drm-resources"

 #include "drmconnector.h"
 #include "drmcrtc.h"
 #include "drmencoder.h"
 #include "drmplane.h"
 #include "drmresources.h"

 #include <errno.h>
 #include <fcntl.h>
 #include <stdint.h>
 #include <xf86drm.h>
 #include <xf86drmMode.h>

 #include <cutils/log.h>
 #include <cutils/properties.h>

 namespace android {

 DrmResources::DrmResources() : fd_(-1), mode_id_(0), compositor_(this) {
 }

 DrmResources::~DrmResources() {
   for (std::vector<DrmConnector *>::const_iterator iter = connectors_.begin();
        iter != connectors_.end(); ++iter)
     delete *iter;
   connectors_.clear();

   for (std::vector<DrmEncoder *>::const_iterator iter = encoders_.begin();
        iter != encoders_.end(); ++iter)
     delete *iter;
   encoders_.clear();

   for (std::vector<DrmCrtc *>::const_iterator iter = crtcs_.begin();
        iter != crtcs_.end(); ++iter)
     delete *iter;
   crtcs_.clear();

   for (std::vector<DrmPlane *>::const_iterator iter = planes_.begin();
        iter != planes_.end(); ++iter)
     delete *iter;
   planes_.clear();

   if (fd_ >= 0)
     close(fd_);
 }

 int DrmResources::Init() {
   char path[PROPERTY_VALUE_MAX];
   property_get("hwc.drm.device", path, "/dev/dri/card0");

   /* TODO: Use drmOpenControl here instead */
   fd_ = open(path, O_RDWR);
   if (fd_ < 0) {
     ALOGE("Failed to open dri- %s", strerror(-errno));
     return -ENODEV;
   }

   int ret = drmSetClientCap(fd_, DRM_CLIENT_CAP_UNIVERSAL_PLANES, 1);
   if (ret) {
     ALOGE("Failed to set universal plane cap %d", ret);
     return ret;
   }

   ret = drmSetClientCap(fd_, DRM_CLIENT_CAP_ATOMIC, 1);
   if (ret) {
     ALOGE("Failed to set atomic cap %d", ret);
     return ret;
   }

   drmModeResPtr res = drmModeGetResources(fd_);
   if (!res) {
     ALOGE("Failed to get DrmResources resources");
     return -ENODEV;
   }

   bool found_primary = false;
   int display_num = 1;

   for (int i = 0; !ret && i < res->count_crtcs; ++i) {
     drmModeCrtcPtr c = drmModeGetCrtc(fd_, res->crtcs[i]);
     if (!c) {
       ALOGE("Failed to get crtc %d", res->crtcs[i]);
       ret = -ENODEV;
       break;
     }

     DrmCrtc *crtc = new DrmCrtc(this, c, i);

     drmModeFreeCrtc(c);

     if (!crtc) {
       ALOGE("Failed to allocate crtc %d", res->crtcs[i]);
       ret = -ENOMEM;
       break;
     }

     ret = crtc->Init();
     if (ret) {
       ALOGE("Failed to initialize crtc %d", res->crtcs[i]);
       delete crtc;
       break;
     }
     crtcs_.push_back(crtc);
   }

   for (int i = 0; !ret && i < res->count_encoders; ++i) {
     drmModeEncoderPtr e = drmModeGetEncoder(fd_, res->encoders[i]);
     if (!e) {
       ALOGE("Failed to get encoder %d", res->encoders[i]);
       ret = -ENODEV;
       break;
     }

     std::vector<DrmCrtc *> possible_crtcs;
     DrmCrtc *current_crtc = NULL;
     for (std::vector<DrmCrtc *>::const_iterator iter = crtcs_.begin();
          iter != crtcs_.end(); ++iter) {
       if ((1 << (*iter)->pipe()) & e->possible_crtcs)
         possible_crtcs.push_back(*iter);

       if ((*iter)->id() == e->crtc_id)
         current_crtc = (*iter);
     }

     DrmEncoder *enc = new DrmEncoder(e, current_crtc, possible_crtcs);

     drmModeFreeEncoder(e);

     if (!enc) {
       ALOGE("Failed to allocate enc %d", res->encoders[i]);
       ret = -ENOMEM;
       break;
     }
     encoders_.push_back(enc);
   }

   for (int i = 0; !ret && i < res->count_connectors; ++i) {
     drmModeConnectorPtr c = drmModeGetConnector(fd_, res->connectors[i]);
     if (!c) {
       ALOGE("Failed to get connector %d", res->connectors[i]);
       ret = -ENODEV;
       break;
     }

     std::vector<DrmEncoder *> possible_encoders;
     DrmEncoder *current_encoder = NULL;
     for (int j = 0; j < c->count_encoders; ++j) {
       for (std::vector<DrmEncoder *>::const_iterator iter = encoders_.begin();
            iter != encoders_.end(); ++iter) {
         if ((*iter)->id() == c->encoders[j])
           possible_encoders.push_back((*iter));
         if ((*iter)->id() == c->encoder_id)
           current_encoder = *iter;
       }
     }

     DrmConnector *conn =
         new DrmConnector(this, c, current_encoder, possible_encoders);

     drmModeFreeConnector(c);

     if (!conn) {
       ALOGE("Failed to allocate conn %d", res->connectors[i]);
       ret = -ENOMEM;
       break;
     }

     ret = conn->Init();
     if (ret) {
       ALOGE("Init connector %d failed", res->connectors[i]);
       delete conn;
       break;
     }
     connectors_.push_back(conn);

     if (conn->built_in() && !found_primary) {
       conn->set_display(0);
       found_primary = true;
     } else {
       conn->set_display(display_num);
       ++display_num;
     }
   }
   if (res)
     drmModeFreeResources(res);

   // Catch-all for the above loops
   if (ret)
     return ret;

   drmModePlaneResPtr plane_res = drmModeGetPlaneResources(fd_);
   if (!plane_res) {
     ALOGE("Failed to get plane resources");
     return -ENOENT;
   }

   for (uint32_t i = 0; i < plane_res->count_planes; ++i) {
     drmModePlanePtr p = drmModeGetPlane(fd_, plane_res->planes[i]);
     if (!p) {
       ALOGE("Failed to get plane %d", plane_res->planes[i]);
       ret = -ENODEV;
       break;
     }

     DrmPlane *plane = new DrmPlane(this, p);

     drmModeFreePlane(p);

     if (!plane) {
       ALOGE("Allocate plane %d failed", plane_res->planes[i]);
       ret = -ENOMEM;
       break;
     }

     ret = plane->Init();
     if (ret) {
       ALOGE("Init plane %d failed", plane_res->planes[i]);
       delete plane;
       break;
     }

     planes_.push_back(plane);
   }
   drmModeFreePlaneResources(plane_res);
   if (ret)
     return ret;

   ret = compositor_.Init();
   if (ret)
     return ret;

   for (auto i = begin_connectors(); i != end_connectors(); ++i) {
     ret = CreateDisplayPipe(*i);
     if (ret) {
       ALOGE("Failed CreateDisplayPipe %d with %d", (*i)->id(), ret);
       return ret;
     }
   }
   return 0;
 }

 int DrmResources::fd() const {
   return fd_;
 }

 DrmResources::ConnectorIter DrmResources::begin_connectors() const {
   return connectors_.begin();
 }

 DrmResources::ConnectorIter DrmResources::end_connectors() const {
   return connectors_.end();
 }

 DrmConnector *DrmResources::GetConnectorForDisplay(int display) const {
   for (ConnectorIter iter = connectors_.begin(); iter != connectors_.end();
        ++iter) {
     if ((*iter)->display() == display)
       return *iter;
   }
   return NULL;
 }

 DrmCrtc *DrmResources::GetCrtcForDisplay(int display) const {
   for (std::vector<DrmCrtc *>::const_iterator iter = crtcs_.begin();
        iter != crtcs_.end(); ++iter) {
     if ((*iter)->display() == display)
       return *iter;
   }
   return NULL;
 }

 DrmResources::PlaneIter DrmResources::begin_planes() const {
   return planes_.begin();
 }

 DrmResources::PlaneIter DrmResources::end_planes() const {
   return planes_.end();
 }

 DrmPlane *DrmResources::GetPlane(uint32_t id) const {
   for (std::vector<DrmPlane *>::const_iterator iter = planes_.begin();
        iter != planes_.end(); ++iter) {
     if ((*iter)->id() == id)
       return *iter;
   }
   return NULL;
 }

 uint32_t DrmResources::next_mode_id() {
   return ++mode_id_;
 }

 int DrmResources::TryEncoderForDisplay(int display, DrmEncoder *enc) {
   /* First try to use the currently-bound crtc */
   DrmCrtc *crtc = enc->crtc();
   if (crtc && crtc->can_bind(display)) {
     crtc->set_display(display);
     return 0;
   }

   /* Try to find a possible crtc which will work */
   for (DrmEncoder::CrtcIter iter = enc->begin_possible_crtcs();
        iter != enc->end_possible_crtcs(); ++iter) {
     /* We've already tried this earlier */
     if (*iter == enc->crtc())
       continue;

     if ((*iter)->can_bind(display)) {
       enc->set_crtc(*iter);
       (*iter)->set_display(display);
       return 0;
     }
   }

   /* We can't use the encoder, but nothing went wrong, try another one */
   return -EAGAIN;
 }

 int DrmResources::CreateDisplayPipe(DrmConnector *connector) {
   int display = connector->display();
   /* Try to use current setup first */
   if (connector->encoder()) {
     int ret = TryEncoderForDisplay(display, connector->encoder());
     if (!ret) {
       return 0;
     } else if (ret != -EAGAIN) {
       ALOGE("Could not set mode %d/%d", display, ret);
       return ret;
     }
   }

   for (DrmConnector::EncoderIter iter = connector->begin_possible_encoders();
        iter != connector->end_possible_encoders(); ++iter) {
     int ret = TryEncoderForDisplay(display, *iter);
     if (!ret) {
       connector->set_encoder(*iter);
       return 0;
     } else if (ret != -EAGAIN) {
       ALOGE("Could not set mode %d/%d", display, ret);
       return ret;
     }
   }
   ALOGE("Could not find a suitable encoder/crtc for display %d",
         connector->display());
   return -ENODEV;
 }

 int DrmResources::CreatePropertyBlob(void *data, size_t length,
                                      uint32_t *blob_id) {
   struct drm_mode_create_blob create_blob;
   memset(&create_blob, 0, sizeof(create_blob));
   create_blob.length = length;
   create_blob.data = (__u64)data;

   int ret = drmIoctl(fd_, DRM_IOCTL_MODE_CREATEPROPBLOB, &create_blob);
   if (ret) {
     ALOGE("Failed to create mode property blob %d", ret);
     return ret;
   }
   *blob_id = create_blob.blob_id;
   return 0;
 }

 int DrmResources::DestroyPropertyBlob(uint32_t blob_id) {
   if (!blob_id)
     return 0;

   struct drm_mode_destroy_blob destroy_blob;
   memset(&destroy_blob, 0, sizeof(destroy_blob));
   destroy_blob.blob_id = (__u32)blob_id;
   int ret = drmIoctl(fd_, DRM_IOCTL_MODE_DESTROYPROPBLOB, &destroy_blob);
   if (ret) {
     ALOGE("Failed to destroy mode property blob %ld/%d", blob_id, ret);
     return ret;
   }
   return 0;
 }

 int DrmResources::SetDisplayActiveMode(int display, const DrmMode &mode) {
   std::unique_ptr<DrmComposition> comp(compositor_.CreateComposition(NULL));
   if (!comp) {
     ALOGE("Failed to create composition for dpms on %d", display);
     return -ENOMEM;
   }
   int ret = comp->SetDisplayMode(display, mode);
   if (ret) {
     ALOGE("Failed to add mode to composition on %d %d", display, ret);
     return ret;
   }
   ret = compositor_.QueueComposition(std::move(comp));
   if (ret) {
     ALOGE("Failed to queue dpms composition on %d %d", display, ret);
     return ret;
   }
   return 0;
 }

 int DrmResources::SetDpmsMode(int display, uint64_t mode) {
   if (mode != DRM_MODE_DPMS_ON && mode != DRM_MODE_DPMS_OFF) {
     ALOGE("Invalid dpms mode %d", mode);
     return -EINVAL;
   }

   std::unique_ptr<DrmComposition> comp(compositor_.CreateComposition(NULL));
   if (!comp) {
     ALOGE("Failed to create composition for dpms on %d", display);
     return -ENOMEM;
   }
   int ret = comp->SetDpmsMode(display, mode);
   if (ret) {
     ALOGE("Failed to add dpms %ld to composition on %d %d", mode, display, ret);
     return ret;
   }
   ret = compositor_.QueueComposition(std::move(comp));
   if (ret) {
     ALOGE("Failed to queue dpms composition on %d %d", display, ret);
     return ret;
   }
   return 0;
 }

 DrmCompositor *DrmResources::compositor() {
   return &compositor_;
 }

 int DrmResources::GetProperty(uint32_t obj_id, uint32_t obj_type,
                               const char *prop_name, DrmProperty *property) {
   drmModeObjectPropertiesPtr props;

   props = drmModeObjectGetProperties(fd_, obj_id, obj_type);
   if (!props) {
     ALOGE("Failed to get properties for %d/%x", obj_id, obj_type);
     return -ENODEV;
   }

   bool found = false;
   for (int i = 0; !found && (size_t)i < props->count_props; ++i) {
     drmModePropertyPtr p = drmModeGetProperty(fd_, props->props[i]);
     if (!strcmp(p->name, prop_name)) {
       property->Init(p, props->prop_values[i]);
       found = true;
     }
     drmModeFreeProperty(p);
   }

   drmModeFreeObjectProperties(props);
   return found ? 0 : -ENOENT;
 }

 int DrmResources::GetPlaneProperty(const DrmPlane &plane, const char *prop_name,
                                    DrmProperty *property) {
   return GetProperty(plane.id(), DRM_MODE_OBJECT_PLANE, prop_name, property);
 }

 int DrmResources::GetCrtcProperty(const DrmCrtc &crtc, const char *prop_name,
                                   DrmProperty *property) {
   return GetProperty(crtc.id(), DRM_MODE_OBJECT_CRTC, prop_name, property);
 }

 int DrmResources::GetConnectorProperty(const DrmConnector &connector,
                                        const char *prop_name,
                                        DrmProperty *property) {
   return GetProperty(connector.id(), DRM_MODE_OBJECT_CONNECTOR, prop_name,
                      property);
 }
 }
	/*
	* Copyright (C) 2015 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#define LOG_TAG "hwc-drm-resources"

	#include "drmconnector.h"
	#include "drmcrtc.h"
	#include "drmencoder.h"
	#include "drmplane.h"
	#include "drmresources.h"

	#include <errno.h>
	#include <fcntl.h>
	#include <stdint.h>
	#include <xf86drm.h>
	#include <xf86drmMode.h>

	#include <cutils/log.h>
	#include <cutils/properties.h>

	namespace android {

	DrmResources::DrmResources() : fd_(-1), mode_id_(0), compositor_(this) {
	}

	DrmResources::~DrmResources() {
	for (std::vector<DrmConnector *>::const_iterator iter = connectors_.begin();
	iter != connectors_.end(); ++iter)
	delete *iter;
	connectors_.clear();

	for (std::vector<DrmEncoder *>::const_iterator iter = encoders_.begin();
	iter != encoders_.end(); ++iter)
	delete *iter;
	encoders_.clear();

	for (std::vector<DrmCrtc *>::const_iterator iter = crtcs_.begin();
	iter != crtcs_.end(); ++iter)
	delete *iter;
	crtcs_.clear();

	for (std::vector<DrmPlane *>::const_iterator iter = planes_.begin();
	iter != planes_.end(); ++iter)
	delete *iter;
	planes_.clear();

	if (fd_ >= 0)
	close(fd_);
	}

	int DrmResources::Init() {
	char path[PROPERTY_VALUE_MAX];
	property_get("hwc.drm.device", path, "/dev/dri/card0");

	/* TODO: Use drmOpenControl here instead */
	fd_ = open(path, O_RDWR);
	if (fd_ < 0) {
	ALOGE("Failed to open dri- %s", strerror(-errno));
	return -ENODEV;
	}

	int ret = drmSetClientCap(fd_, DRM_CLIENT_CAP_UNIVERSAL_PLANES, 1);
	if (ret) {
	ALOGE("Failed to set universal plane cap %d", ret);
	return ret;
	}

	ret = drmSetClientCap(fd_, DRM_CLIENT_CAP_ATOMIC, 1);
	if (ret) {
	ALOGE("Failed to set atomic cap %d", ret);
	return ret;
	}

	drmModeResPtr res = drmModeGetResources(fd_);
	if (!res) {
	ALOGE("Failed to get DrmResources resources");
	return -ENODEV;
	}

	bool found_primary = false;
	int display_num = 1;

	for (int i = 0; !ret && i < res->count_crtcs; ++i) {
	drmModeCrtcPtr c = drmModeGetCrtc(fd_, res->crtcs[i]);
	if (!c) {
	ALOGE("Failed to get crtc %d", res->crtcs[i]);
	ret = -ENODEV;
	break;
	}

	DrmCrtc *crtc = new DrmCrtc(this, c, i);

	drmModeFreeCrtc(c);

	if (!crtc) {
	ALOGE("Failed to allocate crtc %d", res->crtcs[i]);
	ret = -ENOMEM;
	break;
	}

	ret = crtc->Init();
	if (ret) {
	ALOGE("Failed to initialize crtc %d", res->crtcs[i]);
	delete crtc;
	break;
	}
	crtcs_.push_back(crtc);
	}

	for (int i = 0; !ret && i < res->count_encoders; ++i) {
	drmModeEncoderPtr e = drmModeGetEncoder(fd_, res->encoders[i]);
	if (!e) {
	ALOGE("Failed to get encoder %d", res->encoders[i]);
	ret = -ENODEV;
	break;
	}

	std::vector<DrmCrtc *> possible_crtcs;
	DrmCrtc *current_crtc = NULL;
	for (std::vector<DrmCrtc *>::const_iterator iter = crtcs_.begin();
	iter != crtcs_.end(); ++iter) {
	if ((1 << (*iter)->pipe()) & e->possible_crtcs)
	possible_crtcs.push_back(*iter);

	if ((*iter)->id() == e->crtc_id)
	current_crtc = (*iter);
	}

	DrmEncoder *enc = new DrmEncoder(e, current_crtc, possible_crtcs);

	drmModeFreeEncoder(e);

	if (!enc) {
	ALOGE("Failed to allocate enc %d", res->encoders[i]);
	ret = -ENOMEM;
	break;
	}
	encoders_.push_back(enc);
	}

	for (int i = 0; !ret && i < res->count_connectors; ++i) {
	drmModeConnectorPtr c = drmModeGetConnector(fd_, res->connectors[i]);
	if (!c) {
	ALOGE("Failed to get connector %d", res->connectors[i]);
	ret = -ENODEV;
	break;
	}

	std::vector<DrmEncoder *> possible_encoders;
	DrmEncoder *current_encoder = NULL;
	for (int j = 0; j < c->count_encoders; ++j) {
	for (std::vector<DrmEncoder *>::const_iterator iter = encoders_.begin();
	iter != encoders_.end(); ++iter) {
	if ((*iter)->id() == c->encoders[j])
	possible_encoders.push_back((*iter));
	if ((*iter)->id() == c->encoder_id)
	current_encoder = *iter;
	}
	}

	DrmConnector *conn =
	new DrmConnector(this, c, current_encoder, possible_encoders);

	drmModeFreeConnector(c);

	if (!conn) {
	ALOGE("Failed to allocate conn %d", res->connectors[i]);
	ret = -ENOMEM;
	break;
	}

	ret = conn->Init();
	if (ret) {
	ALOGE("Init connector %d failed", res->connectors[i]);
	delete conn;
	break;
	}
	connectors_.push_back(conn);

	if (conn->built_in() && !found_primary) {
	conn->set_display(0);
	found_primary = true;
	} else {
	conn->set_display(display_num);
	++display_num;
	}
	}
	if (res)
	drmModeFreeResources(res);

	// Catch-all for the above loops
	if (ret)
	return ret;

	drmModePlaneResPtr plane_res = drmModeGetPlaneResources(fd_);
	if (!plane_res) {
	ALOGE("Failed to get plane resources");
	return -ENOENT;
	}

	for (uint32_t i = 0; i < plane_res->count_planes; ++i) {
	drmModePlanePtr p = drmModeGetPlane(fd_, plane_res->planes[i]);
	if (!p) {
	ALOGE("Failed to get plane %d", plane_res->planes[i]);
	ret = -ENODEV;
	break;
	}

	DrmPlane *plane = new DrmPlane(this, p);

	drmModeFreePlane(p);

	if (!plane) {
	ALOGE("Allocate plane %d failed", plane_res->planes[i]);
	ret = -ENOMEM;
	break;
	}

	ret = plane->Init();
	if (ret) {
	ALOGE("Init plane %d failed", plane_res->planes[i]);
	delete plane;
	break;
	}

	planes_.push_back(plane);
	}
	drmModeFreePlaneResources(plane_res);
	if (ret)
	return ret;

	ret = compositor_.Init();
	if (ret)
	return ret;

	for (auto i = begin_connectors(); i != end_connectors(); ++i) {
	ret = CreateDisplayPipe(*i);
	if (ret) {
	ALOGE("Failed CreateDisplayPipe %d with %d", (*i)->id(), ret);
	return ret;
	}
	}
	return 0;
	}

	int DrmResources::fd() const {
	return fd_;
	}

	DrmResources::ConnectorIter DrmResources::begin_connectors() const {
	return connectors_.begin();
	}

	DrmResources::ConnectorIter DrmResources::end_connectors() const {
	return connectors_.end();
	}

	DrmConnector *DrmResources::GetConnectorForDisplay(int display) const {
	for (ConnectorIter iter = connectors_.begin(); iter != connectors_.end();
	++iter) {
	if ((*iter)->display() == display)
	return *iter;
	}
	return NULL;
	}

	DrmCrtc *DrmResources::GetCrtcForDisplay(int display) const {
	for (std::vector<DrmCrtc *>::const_iterator iter = crtcs_.begin();
	iter != crtcs_.end(); ++iter) {
	if ((*iter)->display() == display)
	return *iter;
	}
	return NULL;
	}

	DrmResources::PlaneIter DrmResources::begin_planes() const {
	return planes_.begin();
	}

	DrmResources::PlaneIter DrmResources::end_planes() const {
	return planes_.end();
	}

	DrmPlane *DrmResources::GetPlane(uint32_t id) const {
	for (std::vector<DrmPlane *>::const_iterator iter = planes_.begin();
	iter != planes_.end(); ++iter) {
	if ((*iter)->id() == id)
	return *iter;
	}
	return NULL;
	}

	uint32_t DrmResources::next_mode_id() {
	return ++mode_id_;
	}

	int DrmResources::TryEncoderForDisplay(int display, DrmEncoder *enc) {
	/* First try to use the currently-bound crtc */
	DrmCrtc *crtc = enc->crtc();
	if (crtc && crtc->can_bind(display)) {
	crtc->set_display(display);
	return 0;
	}

	/* Try to find a possible crtc which will work */
	for (DrmEncoder::CrtcIter iter = enc->begin_possible_crtcs();
	iter != enc->end_possible_crtcs(); ++iter) {
	/* We've already tried this earlier */
	if (*iter == enc->crtc())
	continue;

	if ((*iter)->can_bind(display)) {
	enc->set_crtc(*iter);
	(*iter)->set_display(display);
	return 0;
	}
	}

	/* We can't use the encoder, but nothing went wrong, try another one */
	return -EAGAIN;
	}

	int DrmResources::CreateDisplayPipe(DrmConnector *connector) {
	int display = connector->display();
	/* Try to use current setup first */
	if (connector->encoder()) {
	int ret = TryEncoderForDisplay(display, connector->encoder());
	if (!ret) {
	return 0;
	} else if (ret != -EAGAIN) {
	ALOGE("Could not set mode %d/%d", display, ret);
	return ret;
	}
	}

	for (DrmConnector::EncoderIter iter = connector->begin_possible_encoders();
	iter != connector->end_possible_encoders(); ++iter) {
	int ret = TryEncoderForDisplay(display, *iter);
	if (!ret) {
	connector->set_encoder(*iter);
	return 0;
	} else if (ret != -EAGAIN) {
	ALOGE("Could not set mode %d/%d", display, ret);
	return ret;
	}
	}
	ALOGE("Could not find a suitable encoder/crtc for display %d",
	connector->display());
	return -ENODEV;
	}

	int DrmResources::CreatePropertyBlob(void *data, size_t length,
	uint32_t *blob_id) {
	struct drm_mode_create_blob create_blob;
	memset(&create_blob, 0, sizeof(create_blob));
	create_blob.length = length;
	create_blob.data = (__u64)data;

	int ret = drmIoctl(fd_, DRM_IOCTL_MODE_CREATEPROPBLOB, &create_blob);
	if (ret) {
	ALOGE("Failed to create mode property blob %d", ret);
	return ret;
	}
	*blob_id = create_blob.blob_id;
	return 0;
	}

	int DrmResources::DestroyPropertyBlob(uint32_t blob_id) {
	if (!blob_id)
	return 0;

	struct drm_mode_destroy_blob destroy_blob;
	memset(&destroy_blob, 0, sizeof(destroy_blob));
	destroy_blob.blob_id = (__u32)blob_id;
	int ret = drmIoctl(fd_, DRM_IOCTL_MODE_DESTROYPROPBLOB, &destroy_blob);
	if (ret) {
	ALOGE("Failed to destroy mode property blob %ld/%d", blob_id, ret);
	return ret;
	}
	return 0;
	}

	int DrmResources::SetDisplayActiveMode(int display, const DrmMode &mode) {
	std::unique_ptr<DrmComposition> comp(compositor_.CreateComposition(NULL));
	if (!comp) {
	ALOGE("Failed to create composition for dpms on %d", display);
	return -ENOMEM;
	}
	int ret = comp->SetDisplayMode(display, mode);
	if (ret) {
	ALOGE("Failed to add mode to composition on %d %d", display, ret);
	return ret;
	}
	ret = compositor_.QueueComposition(std::move(comp));
	if (ret) {
	ALOGE("Failed to queue dpms composition on %d %d", display, ret);
	return ret;
	}
	return 0;
	}

	int DrmResources::SetDpmsMode(int display, uint64_t mode) {
	if (mode != DRM_MODE_DPMS_ON && mode != DRM_MODE_DPMS_OFF) {
	ALOGE("Invalid dpms mode %d", mode);
	return -EINVAL;
	}

	std::unique_ptr<DrmComposition> comp(compositor_.CreateComposition(NULL));
	if (!comp) {
	ALOGE("Failed to create composition for dpms on %d", display);
	return -ENOMEM;
	}
	int ret = comp->SetDpmsMode(display, mode);
	if (ret) {
	ALOGE("Failed to add dpms %ld to composition on %d %d", mode, display, ret);
	return ret;
	}
	ret = compositor_.QueueComposition(std::move(comp));
	if (ret) {
	ALOGE("Failed to queue dpms composition on %d %d", display, ret);
	return ret;
	}
	return 0;
	}

	DrmCompositor *DrmResources::compositor() {
	return &compositor_;
	}

	int DrmResources::GetProperty(uint32_t obj_id, uint32_t obj_type,
	const char prop_name, DrmProperty property) {
	drmModeObjectPropertiesPtr props;

	props = drmModeObjectGetProperties(fd_, obj_id, obj_type);
	if (!props) {
	ALOGE("Failed to get properties for %d/%x", obj_id, obj_type);
	return -ENODEV;
	}

	bool found = false;
	for (int i = 0; !found && (size_t)i < props->count_props; ++i) {
	drmModePropertyPtr p = drmModeGetProperty(fd_, props->props[i]);
	if (!strcmp(p->name, prop_name)) {
	property->Init(p, props->prop_values[i]);
	found = true;
	}
	drmModeFreeProperty(p);
	}

	drmModeFreeObjectProperties(props);
	return found ? 0 : -ENOENT;
	}

	int DrmResources::GetPlaneProperty(const DrmPlane &plane, const char *prop_name,
	DrmProperty *property) {
	return GetProperty(plane.id(), DRM_MODE_OBJECT_PLANE, prop_name, property);
	}

	int DrmResources::GetCrtcProperty(const DrmCrtc &crtc, const char *prop_name,
	DrmProperty *property) {
	return GetProperty(crtc.id(), DRM_MODE_OBJECT_CRTC, prop_name, property);
	}

	int DrmResources::GetConnectorProperty(const DrmConnector &connector,
	const char *prop_name,
	DrmProperty *property) {
	return GetProperty(connector.id(), DRM_MODE_OBJECT_CONNECTOR, prop_name,
	property);
	}
	}