base/libdrmresource/drmdevice.cpp - LeafOS-Devices/android_hardware_samsung_slsi-linaro_graphics - Gitiles

 /*
  * 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-device"

 #include "drmdevice.h"
 #include "drmconnector.h"
 #include "drmcrtc.h"
 #include "drmencoder.h"
 #include "drmeventlistener.h"
 #include "drmplane.h"

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

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

 #ifndef DRM_CLIENT_CAP_WRITEBACK_CONNECTORS
 #define DRM_CLIENT_CAP_WRITEBACK_CONNECTORS 5
 #endif

 namespace android {

 DrmDevice::DrmDevice() : event_listener_(this) {
 }

 DrmDevice::~DrmDevice() {
   event_listener_.Exit();
 }

 std::tuple<int, int> DrmDevice::Init(const char *path, int num_displays) {
   /* TODO: Use drmOpenControl here instead */
   fd_.Set(open(path, O_RDWR));
   if (fd() < 0) {
     ALOGE("Failed to open dri %s: %s", path, strerror(errno));
     return std::make_tuple(-ENODEV, 0);
   }

   if (drmGetNodeTypeFromFd(fd()) != DRM_NODE_PRIMARY) {
     ALOGE("Node Type is not Primary.. retry..");
     fd_.Set(close(fd()));
     return std::make_tuple(-EEXIST, 0);
   }

   int ret = drmSetClientCap(fd(), DRM_CLIENT_CAP_UNIVERSAL_PLANES, 1);
   if (ret) {
     ALOGE("Failed to set universal plane cap %d", ret);
     return std::make_tuple(ret, 0);
   }

   ret = drmSetClientCap(fd(), DRM_CLIENT_CAP_ATOMIC, 1);
   if (ret) {
     ALOGE("Failed to set atomic cap %d", ret);
     return std::make_tuple(ret, 0);
   }

 #ifdef DRM_CLIENT_CAP_WRITEBACK_CONNECTORS
   ret = drmSetClientCap(fd(), DRM_CLIENT_CAP_WRITEBACK_CONNECTORS, 1);
   if (ret) {
     ALOGI("Failed to set writeback cap %d", ret);
     ret = 0;
   }
 #endif

   drmModeResPtr res = drmModeGetResources(fd());
   if (!res) {
     ALOGE("Failed to get DrmDevice resources");
     return std::make_tuple(-ENODEV, 0);
   }

   min_resolution_ = std::pair<uint32_t, uint32_t>(res->min_width,
                                                   res->min_height);
   max_resolution_ = std::pair<uint32_t, uint32_t>(res->max_width,
                                                   res->max_height);

   // Assumes that the primary display will always be in the first
   // drm_device opened.
   bool found_primary = num_displays != 0;

   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;
     }

     std::unique_ptr<DrmCrtc> crtc(new DrmCrtc(this, c, i));
     drmModeFreeCrtc(c);

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

   std::vector<int> possible_clones;
   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 (auto &crtc : crtcs_) {
       if ((1 << crtc->pipe()) & e->possible_crtcs)
         possible_crtcs.push_back(crtc.get());

       if (crtc->id() == e->crtc_id)
         current_crtc = crtc.get();
     }

     std::unique_ptr<DrmEncoder> enc(
         new DrmEncoder(e, current_crtc, possible_crtcs));
     possible_clones.push_back(e->possible_clones);
     drmModeFreeEncoder(e);

     encoders_.emplace_back(std::move(enc));
   }

   for (unsigned int i = 0; i < encoders_.size(); i++) {
     for (unsigned int j = 0; j < encoders_.size(); j++)
       if (possible_clones[i] & (1 << j))
         encoders_[i]->AddPossibleClone(encoders_[j].get());
   }

   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 (auto &encoder : encoders_) {
         if (encoder->id() == c->encoders[j])
           possible_encoders.push_back(encoder.get());
         if (encoder->id() == c->encoder_id)
           current_encoder = encoder.get();
       }
     }

     std::unique_ptr<DrmConnector> conn(
         new DrmConnector(this, c, current_encoder, possible_encoders));

     drmModeFreeConnector(c);

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

     if (conn->writeback())
       writeback_connectors_.emplace_back(std::move(conn));
     else
       connectors_.emplace_back(std::move(conn));
   }

   // First look for primary amongst internal connectors
   for (auto &conn : connectors_) {
     if (conn->internal() && !found_primary) {
       conn->set_display(num_displays);
       displays_[num_displays] = num_displays;
       ++num_displays;
       found_primary = true;
       break;
     }
   }

   // Then pick first available as primary and for the others assign
   // consecutive display_numbers.
   for (auto &conn : connectors_) {
     if (conn->external() || conn->internal()) {
       if (!found_primary) {
         conn->set_display(num_displays);
         displays_[num_displays] = num_displays;
         found_primary = true;
         ++num_displays;
       } else if (conn->display() < 0) {
         conn->set_display(num_displays);
         displays_[num_displays] = num_displays;
         ++num_displays;
       }
     }
   }

   if (res)
     drmModeFreeResources(res);

   // Catch-all for the above loops
   if (ret)
     return std::make_tuple(ret, 0);

   drmModePlaneResPtr plane_res = drmModeGetPlaneResources(fd());
   if (!plane_res) {
     ALOGE("Failed to get plane resources");
     return std::make_tuple(-ENOENT, 0);
   }

   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;
     }

     std::unique_ptr<DrmPlane> plane(new DrmPlane(this, p));

     drmModeFreePlane(p);

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

     planes_.emplace_back(std::move(plane));
   }
   drmModeFreePlaneResources(plane_res);
   if (ret)
     return std::make_tuple(ret, 0);

   ret = event_listener_.Init();
   if (ret) {
     ALOGE("Can't initialize event listener %d", ret);
     return std::make_tuple(ret, 0);
   }

   for (auto &conn : connectors_) {
     ret = CreateDisplayPipe(conn.get());
     if (ret) {
       ALOGE("Failed CreateDisplayPipe %d with %d", conn->id(), ret);
       return std::make_tuple(ret, 0);
     }
   }
   return std::make_tuple(ret, displays_.size());
 }

 bool DrmDevice::HandlesDisplay(int display) const {
   return displays_.find(display) != displays_.end();
 }

 DrmConnector *DrmDevice::GetConnectorForDisplay(int display) const {
   for (auto &conn : connectors_) {
     if (conn->display() == display)
       return conn.get();
   }
   return NULL;
 }

 DrmConnector *DrmDevice::GetWritebackConnectorForDisplay(int display) const {
   for (auto &conn : writeback_connectors_) {
     if (conn->display() == display)
       return conn.get();
   }
   return NULL;
 }

 DrmConnector *DrmDevice::AvailableWritebackConnector(int display) {
   DrmConnector *writeback_conn = GetWritebackConnectorForDisplay(display);
   if (writeback_conn) {
     ALOGI("use attached writeback connector");
     return writeback_conn;
   }

   if (AttachWriteback(display)) {
     ALOGE("Display %d cannot has writeback connector", display);
     return NULL;
   }

   writeback_conn = GetWritebackConnectorForDisplay(display);
   if (!writeback_conn) {
     ALOGE("cannot get writeback_conn");
     return NULL;
   }
   return writeback_conn;
 }

 DrmCrtc *DrmDevice::GetCrtcForDisplay(int display) const {
   for (auto &crtc : crtcs_) {
     if (crtc->display() == display)
       return crtc.get();
   }
   return NULL;
 }

 DrmPlane *DrmDevice::GetPlane(uint32_t id) const {
   for (auto &plane : planes_) {
     if (plane->id() == id)
       return plane.get();
   }
   return NULL;
 }

 const std::vector<std::unique_ptr<DrmCrtc>> &DrmDevice::crtcs() const {
   return crtcs_;
 }

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

 int DrmDevice::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);
     enc->set_crtc(crtc);
     return 0;
   }

   /* Try to find a possible crtc which will work */
   for (DrmCrtc *crtc : enc->possible_crtcs()) {
     /* We've already tried this earlier */
     if (crtc == enc->crtc())
       continue;

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

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

 int DrmDevice::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 (DrmEncoder *enc : connector->possible_encoders()) {
     int ret = TryEncoderForDisplay(display, enc);
     if (!ret) {
       connector->set_encoder(enc);
       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 DrmDevice::AttachWriteback(int display) {
   if (GetWritebackConnectorForDisplay(display) != NULL) {
     ALOGI("Display already has writeback attach to it");
     return 0;
   }

   DrmCrtc *display_crtc = NULL;
   for (auto &crtc : crtcs_) {
     if (crtc->display() == display)
       display_crtc = crtc.get();
   }

   for (auto &writeback_conn : writeback_connectors_) {
     for (DrmEncoder *writeback_enc : writeback_conn->possible_encoders()) {
       for (DrmCrtc *possible_crtc : writeback_enc->possible_crtcs()) {
         if ((display_crtc != NULL) && (possible_crtc != display_crtc))
           continue;
         if (display_crtc == NULL) {
           if (possible_crtc->display() >= 0) {
             continue;
           }
           else {
             display_crtc = possible_crtc;
           }
         }
         display_crtc->set_display(display);
         writeback_enc->set_crtc(display_crtc);
         writeback_conn->set_encoder(writeback_enc);
         writeback_conn->set_display(display_crtc->display());
         writeback_conn->UpdateModes();
         return 0;
        }
      }
    }
   return -EINVAL;
 }

 int DrmDevice::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 DrmDevice::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 %" PRIu32 "/%d", blob_id, ret);
     return ret;
   }
   return 0;
 }

 DrmEventListener *DrmDevice::event_listener() {
   return &event_listener_;
 }

 int DrmDevice::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);
   }

   if (!found)
       property->SetName(prop_name);

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

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

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

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

 int DrmDevice::UpdateCrtcProperty(const DrmCrtc &crtc, DrmProperty *property) {
     drmModeObjectPropertiesPtr props;
     props = drmModeObjectGetProperties(fd(), crtc.id(), DRM_MODE_OBJECT_CRTC);
     if (!props) {
         ALOGE("Failed to get properties for crtc %s", property->name().c_str());
         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 (props->props[i] == property->id()) {
             property->UpdateValue(props->prop_values[i]);
             found = true;
         }
         drmModeFreeProperty(p);
     }
     drmModeFreeObjectProperties(props);
     return found ? 0 : -ENOENT;
 }

 int DrmDevice::UpdateConnectorProperty(const DrmConnector &connector, DrmProperty *property) {
     drmModeObjectPropertiesPtr props;
     props = drmModeObjectGetProperties(fd(), connector.id(), DRM_MODE_OBJECT_CONNECTOR);
     if (!props) {
         ALOGE("Failed to get properties for connector %s", property->name().c_str());
         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 (props->props[i] == property->id()) {
             property->UpdateValue(props->prop_values[i]);
             found = true;
         }
         drmModeFreeProperty(p);
     }
     drmModeFreeObjectProperties(props);
     return found ? 0 : -ENOENT;
 }
 }  // namespace android
	/*
	* 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-device"

	#include "drmdevice.h"
	#include "drmconnector.h"
	#include "drmcrtc.h"
	#include "drmencoder.h"
	#include "drmeventlistener.h"
	#include "drmplane.h"

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

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

	#ifndef DRM_CLIENT_CAP_WRITEBACK_CONNECTORS
	#define DRM_CLIENT_CAP_WRITEBACK_CONNECTORS 5
	#endif

	namespace android {

	DrmDevice::DrmDevice() : event_listener_(this) {
	}

	DrmDevice::~DrmDevice() {
	event_listener_.Exit();
	}

	std::tuple<int, int> DrmDevice::Init(const char *path, int num_displays) {
	/* TODO: Use drmOpenControl here instead */
	fd_.Set(open(path, O_RDWR));
	if (fd() < 0) {
	ALOGE("Failed to open dri %s: %s", path, strerror(errno));
	return std::make_tuple(-ENODEV, 0);
	}

	if (drmGetNodeTypeFromFd(fd()) != DRM_NODE_PRIMARY) {
	ALOGE("Node Type is not Primary.. retry..");
	fd_.Set(close(fd()));
	return std::make_tuple(-EEXIST, 0);
	}

	int ret = drmSetClientCap(fd(), DRM_CLIENT_CAP_UNIVERSAL_PLANES, 1);
	if (ret) {
	ALOGE("Failed to set universal plane cap %d", ret);
	return std::make_tuple(ret, 0);
	}

	ret = drmSetClientCap(fd(), DRM_CLIENT_CAP_ATOMIC, 1);
	if (ret) {
	ALOGE("Failed to set atomic cap %d", ret);
	return std::make_tuple(ret, 0);
	}

	#ifdef DRM_CLIENT_CAP_WRITEBACK_CONNECTORS
	ret = drmSetClientCap(fd(), DRM_CLIENT_CAP_WRITEBACK_CONNECTORS, 1);
	if (ret) {
	ALOGI("Failed to set writeback cap %d", ret);
	ret = 0;
	}
	#endif

	drmModeResPtr res = drmModeGetResources(fd());
	if (!res) {
	ALOGE("Failed to get DrmDevice resources");
	return std::make_tuple(-ENODEV, 0);
	}

	min_resolution_ = std::pair<uint32_t, uint32_t>(res->min_width,
	res->min_height);
	max_resolution_ = std::pair<uint32_t, uint32_t>(res->max_width,
	res->max_height);

	// Assumes that the primary display will always be in the first
	// drm_device opened.
	bool found_primary = num_displays != 0;

	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;
	}

	std::unique_ptr<DrmCrtc> crtc(new DrmCrtc(this, c, i));
	drmModeFreeCrtc(c);

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

	std::vector<int> possible_clones;
	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 (auto &crtc : crtcs_) {
	if ((1 << crtc->pipe()) & e->possible_crtcs)
	possible_crtcs.push_back(crtc.get());

	if (crtc->id() == e->crtc_id)
	current_crtc = crtc.get();
	}

	std::unique_ptr<DrmEncoder> enc(
	new DrmEncoder(e, current_crtc, possible_crtcs));
	possible_clones.push_back(e->possible_clones);
	drmModeFreeEncoder(e);

	encoders_.emplace_back(std::move(enc));
	}

	for (unsigned int i = 0; i < encoders_.size(); i++) {
	for (unsigned int j = 0; j < encoders_.size(); j++)
	if (possible_clones[i] & (1 << j))
	encoders_[i]->AddPossibleClone(encoders_[j].get());
	}

	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 (auto &encoder : encoders_) {
	if (encoder->id() == c->encoders[j])
	possible_encoders.push_back(encoder.get());
	if (encoder->id() == c->encoder_id)
	current_encoder = encoder.get();
	}
	}

	std::unique_ptr<DrmConnector> conn(
	new DrmConnector(this, c, current_encoder, possible_encoders));

	drmModeFreeConnector(c);

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

	if (conn->writeback())
	writeback_connectors_.emplace_back(std::move(conn));
	else
	connectors_.emplace_back(std::move(conn));
	}

	// First look for primary amongst internal connectors
	for (auto &conn : connectors_) {
	if (conn->internal() && !found_primary) {
	conn->set_display(num_displays);
	displays_[num_displays] = num_displays;
	++num_displays;
	found_primary = true;
	break;
	}
	}

	// Then pick first available as primary and for the others assign
	// consecutive display_numbers.
	for (auto &conn : connectors_) {
	if (conn->external() \|\| conn->internal()) {
	if (!found_primary) {
	conn->set_display(num_displays);
	displays_[num_displays] = num_displays;
	found_primary = true;
	++num_displays;
	} else if (conn->display() < 0) {
	conn->set_display(num_displays);
	displays_[num_displays] = num_displays;
	++num_displays;
	}
	}
	}

	if (res)
	drmModeFreeResources(res);

	// Catch-all for the above loops
	if (ret)
	return std::make_tuple(ret, 0);

	drmModePlaneResPtr plane_res = drmModeGetPlaneResources(fd());
	if (!plane_res) {
	ALOGE("Failed to get plane resources");
	return std::make_tuple(-ENOENT, 0);
	}

	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;
	}

	std::unique_ptr<DrmPlane> plane(new DrmPlane(this, p));

	drmModeFreePlane(p);

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

	planes_.emplace_back(std::move(plane));
	}
	drmModeFreePlaneResources(plane_res);
	if (ret)
	return std::make_tuple(ret, 0);

	ret = event_listener_.Init();
	if (ret) {
	ALOGE("Can't initialize event listener %d", ret);
	return std::make_tuple(ret, 0);
	}

	for (auto &conn : connectors_) {
	ret = CreateDisplayPipe(conn.get());
	if (ret) {
	ALOGE("Failed CreateDisplayPipe %d with %d", conn->id(), ret);
	return std::make_tuple(ret, 0);
	}
	}
	return std::make_tuple(ret, displays_.size());
	}

	bool DrmDevice::HandlesDisplay(int display) const {
	return displays_.find(display) != displays_.end();
	}

	DrmConnector *DrmDevice::GetConnectorForDisplay(int display) const {
	for (auto &conn : connectors_) {
	if (conn->display() == display)
	return conn.get();
	}
	return NULL;
	}

	DrmConnector *DrmDevice::GetWritebackConnectorForDisplay(int display) const {
	for (auto &conn : writeback_connectors_) {
	if (conn->display() == display)
	return conn.get();
	}
	return NULL;
	}

	DrmConnector *DrmDevice::AvailableWritebackConnector(int display) {
	DrmConnector *writeback_conn = GetWritebackConnectorForDisplay(display);
	if (writeback_conn) {
	ALOGI("use attached writeback connector");
	return writeback_conn;
	}

	if (AttachWriteback(display)) {
	ALOGE("Display %d cannot has writeback connector", display);
	return NULL;
	}

	writeback_conn = GetWritebackConnectorForDisplay(display);
	if (!writeback_conn) {
	ALOGE("cannot get writeback_conn");
	return NULL;
	}
	return writeback_conn;
	}

	DrmCrtc *DrmDevice::GetCrtcForDisplay(int display) const {
	for (auto &crtc : crtcs_) {
	if (crtc->display() == display)
	return crtc.get();
	}
	return NULL;
	}

	DrmPlane *DrmDevice::GetPlane(uint32_t id) const {
	for (auto &plane : planes_) {
	if (plane->id() == id)
	return plane.get();
	}
	return NULL;
	}

	const std::vector<std::unique_ptr<DrmCrtc>> &DrmDevice::crtcs() const {
	return crtcs_;
	}

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

	int DrmDevice::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);
	enc->set_crtc(crtc);
	return 0;
	}

	/* Try to find a possible crtc which will work */
	for (DrmCrtc *crtc : enc->possible_crtcs()) {
	/* We've already tried this earlier */
	if (crtc == enc->crtc())
	continue;

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

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

	int DrmDevice::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 (DrmEncoder *enc : connector->possible_encoders()) {
	int ret = TryEncoderForDisplay(display, enc);
	if (!ret) {
	connector->set_encoder(enc);
	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 DrmDevice::AttachWriteback(int display) {
	if (GetWritebackConnectorForDisplay(display) != NULL) {
	ALOGI("Display already has writeback attach to it");
	return 0;
	}

	DrmCrtc *display_crtc = NULL;
	for (auto &crtc : crtcs_) {
	if (crtc->display() == display)
	display_crtc = crtc.get();
	}

	for (auto &writeback_conn : writeback_connectors_) {
	for (DrmEncoder *writeback_enc : writeback_conn->possible_encoders()) {
	for (DrmCrtc *possible_crtc : writeback_enc->possible_crtcs()) {
	if ((display_crtc != NULL) && (possible_crtc != display_crtc))
	continue;
	if (display_crtc == NULL) {
	if (possible_crtc->display() >= 0) {
	continue;
	}
	else {
	display_crtc = possible_crtc;
	}
	}
	display_crtc->set_display(display);
	writeback_enc->set_crtc(display_crtc);
	writeback_conn->set_encoder(writeback_enc);
	writeback_conn->set_display(display_crtc->display());
	writeback_conn->UpdateModes();
	return 0;
	}
	}
	}
	return -EINVAL;
	}

	int DrmDevice::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 DrmDevice::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 %" PRIu32 "/%d", blob_id, ret);
	return ret;
	}
	return 0;
	}

	DrmEventListener *DrmDevice::event_listener() {
	return &event_listener_;
	}

	int DrmDevice::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);
	}

	if (!found)
	property->SetName(prop_name);

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

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

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

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

	int DrmDevice::UpdateCrtcProperty(const DrmCrtc &crtc, DrmProperty *property) {
	drmModeObjectPropertiesPtr props;
	props = drmModeObjectGetProperties(fd(), crtc.id(), DRM_MODE_OBJECT_CRTC);
	if (!props) {
	ALOGE("Failed to get properties for crtc %s", property->name().c_str());
	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 (props->props[i] == property->id()) {
	property->UpdateValue(props->prop_values[i]);
	found = true;
	}
	drmModeFreeProperty(p);
	}
	drmModeFreeObjectProperties(props);
	return found ? 0 : -ENOENT;
	}

	int DrmDevice::UpdateConnectorProperty(const DrmConnector &connector, DrmProperty *property) {
	drmModeObjectPropertiesPtr props;
	props = drmModeObjectGetProperties(fd(), connector.id(), DRM_MODE_OBJECT_CONNECTOR);
	if (!props) {
	ALOGE("Failed to get properties for connector %s", property->name().c_str());
	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 (props->props[i] == property->id()) {
	property->UpdateValue(props->prop_values[i]);
	found = true;
	}
	drmModeFreeProperty(p);
	}
	drmModeFreeObjectProperties(props);
	return found ? 0 : -ENOENT;
	}
	} // namespace android