zircon/system/dev/display/intel-i915/igd.cpp - fuchsia - Git at Google

 // Copyright 2018 The Fuchsia Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include <limits.h>
 #include <ddk/protocol/pci-lib.h>
 #include <hwreg/bitfields.h>
 #include <lib/zx/object.h>
 #include <lib/zx/vmar.h>

 #include "igd.h"
 #include "intel-i915.h"
 #include "macros.h"

 namespace {

 // Register definitions from IGD OpRegion/Software SCI documentation. Section
 // numbers reference Skylake Sept 2016 rev 0.5.

 // The number of eDP panel types supported by the IGD API
 static const uint32_t kNumPanelTypes = 16;

 // GMCH SWSCI Register - 5.1.1
 class GmchSwsciRegister : public hwreg::RegisterBase<GmchSwsciRegister, uint16_t> {
 public:
     DEF_BIT(15, sci_event_select);
     DEF_BIT(0, gmch_sw_sci_trigger);

     static auto Get() { return hwreg::RegisterAddr<GmchSwsciRegister>(0); }
 };

 // Entry half of Software SCI Entry/Exit Parameters - 3.3.1
 class SciEntryParam : public hwreg::RegisterBase<SciEntryParam, uint32_t> {
 public:
     DEF_RSVDZ_FIELD(31, 16);
     DEF_FIELD(15, 8, subfunction);
     DEF_RSVDZ_FIELD(7, 5);
     DEF_FIELD(4, 1, function);
     DEF_BIT(0, swsci_indicator);

     // Main function codes
     static const uint32_t kFuncGetBiosData = 4;

     // GetBiosData sub-function codes
     static const uint32_t kGbdaSupportedCalls = 0;
     static const uint32_t kGbdaPanelDetails = 5;

     static auto Get() { return hwreg::RegisterAddr<SciEntryParam>(0); }
 };

 // Exit half of Software SCI Entry/Exit Parameters - 3.3.1
 class SciExitParam : public hwreg::RegisterBase<SciExitParam, uint32_t> {
 public:
     DEF_RSVDZ_FIELD(31, 16);
     DEF_FIELD(15, 8, exit_param);
     DEF_FIELD(7, 5, exit_result);
     DEF_RSVDZ_FIELD(4, 1);
     DEF_BIT(0, swsci_indicator);

     constexpr static uint32_t kResultOk = 1;

     static auto Get() { return hwreg::RegisterAddr<SciExitParam>(0); }
 };

 // Additional param return value for GetBiosData supported calls function - 4.2.2
 class GbdaSupportedCalls : public hwreg::RegisterBase<GbdaSupportedCalls, uint32_t> {
 public:
     DEF_RSVDZ_FIELD(31, 11);
     DEF_BIT(10, get_aksv);
     DEF_BIT(9, spread_spectrum_clocks);
     DEF_RSVDZ_FIELD(8, 7);
     DEF_BIT(6, internal_graphics);
     DEF_BIT(5, tv_std_video_connector_info);
     DEF_BIT(4, get_panel_details);
     DEF_BIT(3, get_boot_display_preference);
     DEF_RSVDZ_FIELD(2, 1);
     DEF_BIT(0, requested_system_callbacks);

     static auto Get() { return hwreg::RegisterAddr<GbdaSupportedCalls>(0); }
 };

 // Additional param return value for GetBiosData panel details function - 4.2.5
 class GbdaPanelDetails : public hwreg::RegisterBase<GbdaPanelDetails, uint32_t> {
 public:
     DEF_RSVDZ_FIELD(31, 23);
     DEF_FIELD(22, 20, bia_ctrl);
     DEF_FIELD(19, 18, blc_support);
     DEF_RSVDZ_BIT(17);
     DEF_BIT(16, lid_state);
     DEF_FIELD(15, 8, panel_type_plus1);
     DEF_FIELD(7, 0, panel_scaling);

     static auto Get() { return hwreg::RegisterAddr<GbdaPanelDetails>(0); }
 };

 static uint8_t iboost_idx_to_level(uint8_t iboost_idx) {
     switch (iboost_idx) {
         case 0: return 1;
         case 1: return 3;
         case 2: return 7;
         default:
             LOG_INFO("Invalid iboost override\n");
             return 0;
     }
 }

 } // namespace

 namespace i915 {

 IgdOpRegion::IgdOpRegion() {}

 IgdOpRegion::~IgdOpRegion() {
     if (igd_opregion_pages_base_) {
         zx::vmar::root_self()->unmap(igd_opregion_pages_base_, igd_opregion_pages_len_);
     }
 }

 template<typename T> T* IgdOpRegion::GetSection(uint16_t* size) {
     return reinterpret_cast<T*>(GetSection(T::kBlockType, size));
 }

 uint8_t* IgdOpRegion::GetSection(uint8_t type, uint16_t* size) {
     uint8_t* data = reinterpret_cast<uint8_t*>(bdb_);
     uint16_t idx = bdb_->header_size;

     while (idx < bdb_->bios_data_blocks_size - sizeof(block_header_t)) {
         block_header_t* header = reinterpret_cast<block_header_t*>(data + idx);
         uint16_t block_size = static_cast<uint16_t>(header->size_low | (header->size_high << 8));
         if (block_size > bdb_->bios_data_blocks_size) {
             return nullptr;
         }
         uint16_t new_idx = static_cast<uint16_t>(idx + block_size + sizeof(block_header_t));
         if (new_idx <= bdb_->bios_data_blocks_size && header->type == type) {
             *size = block_size;
             return data + idx + sizeof(block_header_t);
         }
         idx = new_idx;
     }

     return nullptr;
 }

 bool IgdOpRegion::ProcessDdiConfigs() {
     uint16_t size;
     general_definitions_t* defs = GetSection<general_definitions_t>(&size);
     if (defs == nullptr) {
         LOG_ERROR("Couldn't find vbt general definitions\n");
         return false;
     }
     if (size < sizeof(general_definitions_t)) {
         LOG_ERROR("Bad size in vbt general definitions\n");
         return false;
     }
     uint16_t num_configs = static_cast<uint16_t>(
             (size - sizeof(general_definitions_t)) / defs->ddi_config_size);
     for (int i = 0; i < num_configs; i++) {
         ddi_config_t* cfg = reinterpret_cast<ddi_config_t*>(defs->ddis + i * defs->ddi_config_size);
         if (!cfg->ddi_flags) {
             continue;
         }

         auto ddi_flags = DdiFlags::Get().FromValue(cfg->ddi_flags);
         uint8_t idx;
         if (cfg->port_type < 4 || cfg->port_type == 12) {
             // Types 0, 1, 2, 3, and 12 are HDMI ports A, B, C, D, and E
             if (!ddi_flags.tmds()) {
                 LOG_WARN("Malformed hdmi config\n");
                 continue;
             }

             idx = cfg->port_type < 4 ? static_cast<registers::Ddi>(cfg->port_type)
                                      : registers::DDI_E;
         } else if (7 <= cfg->port_type && cfg->port_type <= 11) {
             // Types 7, 8, 9, 10, 11 are DP ports B, C, D, A, E
             if (!ddi_flags.dp()) {
                 LOG_WARN("Malformed dp config\n");
                 continue;
             }

             if (cfg->port_type <= 9) {
                 idx = static_cast<uint8_t>(cfg->port_type - 6);
             } else if (cfg->port_type == 10) {
                 idx = registers::DDI_A;
             } else {
                 ZX_DEBUG_ASSERT(cfg->port_type == 11);
                 idx = registers::DDI_E;
             }
         } else {
             continue;
         }

         if (ddi_supports_dvi_[idx] || ddi_supports_dp_[idx]) {
             LOG_WARN("Duplicate ddi config\n");
             continue;
         }
         ddi_supports_dvi_[idx] = ddi_flags.tmds();
         ddi_supports_hdmi_[idx] = ddi_flags.tmds() && !ddi_flags.not_hdmi();
         ddi_supports_dp_[idx] = ddi_flags.dp();
         ddi_is_edp_[idx] = ddi_flags.dp() && ddi_flags.internal();

         hdmi_buffer_translation_idx_[idx] = cfg->ddi_buf_trans_idx();
         if (cfg->has_iboost_override()) {
             iboosts_[idx].dp_iboost = iboost_idx_to_level(cfg->dp_iboost_override());
             iboosts_[idx].hdmi_iboost = iboost_idx_to_level(cfg->hdmi_iboost_override());
         } else {
             iboosts_[idx].dp_iboost = 0;
             iboosts_[idx].hdmi_iboost = 0;
         }
     }

     return true;
 }

 bool IgdOpRegion::Swsci(pci_protocol_t* pci,
                         uint16_t function, uint16_t subfunction, uint32_t additional_param,
                         uint16_t* exit_param, uint32_t* additional_res) {
     uint16_t val;
     if (pci_config_read16(pci, kIgdSwSciReg, &val) != ZX_OK) {
         LOG_WARN("Failed to read SWSCI register\n");
         return false;
     }
     auto gmch_swsci_reg = GmchSwsciRegister::Get().FromValue(val);
     if (!gmch_swsci_reg.sci_event_select() || gmch_swsci_reg.gmch_sw_sci_trigger()) {
         LOG_WARN("Bad GMCH SWSCI register value (%04x)\n", val);
         return false;
     }

     sci_interface_protocol_t* sci_interface = reinterpret_cast<sci_interface_protocol_t*>(igd_opregion_->mailbox2);

     auto sci_entry_param = SciEntryParam::Get().FromValue(0);
     sci_entry_param.set_function(function);
     sci_entry_param.set_subfunction(subfunction);
     sci_entry_param.set_swsci_indicator(1);
     sci_interface->entry_and_exit_params = sci_entry_param.reg_value();
     sci_interface->additional_params = additional_param;

     if (pci_config_write16(pci, kIgdSwSciReg,
                            gmch_swsci_reg.set_gmch_sw_sci_trigger(1).reg_value()) != ZX_OK) {
         LOG_WARN("Failed to write SWSCI register\n");
         return false;
     }

     // The spec says to wait for 2ms if driver_sleep_timeout isn't set, but that's not
     // long enough. I've seen delays as long as 10ms, so use 50ms to be safe.
     int timeout_ms = sci_interface->driver_sleep_timeout ? sci_interface->driver_sleep_timeout : 50;
     while (timeout_ms-- > 0) {
         auto sci_exit_param = SciExitParam::Get().FromValue(sci_interface->entry_and_exit_params);
         if (!sci_exit_param.swsci_indicator()) {
             if (sci_exit_param.exit_result() == SciExitParam::kResultOk) {
                 *exit_param = static_cast<uint16_t>(sci_exit_param.exit_param());
                 *additional_res = sci_interface->additional_params;
                 return true;
             } else {
                 LOG_WARN("SWSCI failed (%x)\n", sci_exit_param.exit_result());
                 return false;
             }
         }
         zx_nanosleep(zx_deadline_after(ZX_MSEC(1)));
     }
     LOG_WARN("SWSCI timeout\n");
     return false;
 }

 bool IgdOpRegion::GetPanelType(pci_protocol_t* pci, uint8_t* type) {
     uint16_t exit_param;
     uint32_t additional_res;
     // TODO(stevensd): cache the supported calls when we need to use Swsci more than once
     if (Swsci(pci, SciEntryParam::kFuncGetBiosData, SciEntryParam::kGbdaSupportedCalls,
               0 /* unused additional_param */, &exit_param, &additional_res)) {
         auto support = GbdaSupportedCalls::Get().FromValue(additional_res);
         if (support.get_panel_details()) {
             // TODO(stevensd): Support the case where there is >1 eDP panel
             uint32_t panel_number = 0;
             if (Swsci(pci, SciEntryParam::kFuncGetBiosData, SciEntryParam::kGbdaPanelDetails,
                       panel_number, &exit_param, &additional_res)) {
                 auto details = GbdaPanelDetails::Get().FromValue(additional_res);
                 if (details.panel_type_plus1()
                         && details.panel_type_plus1() < (kNumPanelTypes + 1)) {
                     *type = static_cast<uint8_t>(details.panel_type_plus1() - 1);
                     LOG_SPEW("SWSCI panel type %d\n", *type);
                     return true;
                 }
             }

         }
     }

     uint16_t size;
     lvds_config_t* cfg = GetSection<lvds_config_t>(&size);
     if (!cfg || cfg->panel_type >= kNumPanelTypes) {
         return false;
     }
     *type = cfg->panel_type;

     return true;
 }

 bool IgdOpRegion::CheckForLowVoltageEdp(pci_protocol_t* pci) {
     bool has_edp = true;
     for (unsigned i = 0; i < registers::kDdiCount; i++) {
         has_edp |= ddi_is_edp_[i];
     }
     if (!has_edp) {
         LOG_SPEW("No edp found\n");
         return true;
     }

     uint16_t size;
     edp_config_t* edp = GetSection<edp_config_t>(&size);
     if (edp == nullptr) {
         LOG_WARN("Couldn't find edp general definitions\n");
         return false;
     }

     if (!GetPanelType(pci, &panel_type_)) {
         LOG_TRACE("No panel type\n");
         return false;
     }
     edp_is_low_voltage_ =
             !((edp->vswing_preemphasis[panel_type_ / 2] >> (4 * panel_type_ % 2)) & 0xf);

     LOG_TRACE("Is low voltage edp? %d\n", edp_is_low_voltage_);

     return true;
 }

 void IgdOpRegion::ProcessBacklightData() {
     uint16_t size;
     lfp_backlight_t* data = GetSection<lfp_backlight_t>(&size);

     if (data) {
         lfp_backlight_entry_t* e = &data->entries[panel_type_];
         min_backlight_brightness_ = e->min_brightness / 255.0;
     }
 }

 zx_status_t IgdOpRegion::Init(pci_protocol_t* pci) {
     uint32_t igd_addr;
     zx_status_t status = pci_config_read32(pci, kIgdOpRegionAddrReg, &igd_addr);
     if (status != ZX_OK || !igd_addr) {
         LOG_ERROR("Failed to locate IGD OpRegion (%d)\n", status);
         return status;
     }

     // TODO(stevensd): This is directly mapping a physical address into our address space, which
     // is not something we'll be able to do forever. At some point, there will need to be an
     // actual API (probably in ACPI) to do this.
     zx_handle_t vmo;
     uint32_t igd_opregion_pages_len_ = kIgdOpRegionLen + (igd_addr & PAGE_SIZE);
     // Please do not use get_root_resource() in new code. See ZX-1497.
     status = zx_vmo_create_physical(get_root_resource(),
                                     igd_addr & ~(PAGE_SIZE - 1),
                                     igd_opregion_pages_len_, &vmo);
     if (status != ZX_OK) {
         LOG_ERROR("Failed to access IGD OpRegion (%d)\n", status);
         return status;
     }
     igd_opregion_pages_ = zx::vmo(vmo);

     status = zx::vmar::root_self()->map(0, igd_opregion_pages_, 0, igd_opregion_pages_len_,
                                        ZX_VM_PERM_READ | ZX_VM_PERM_WRITE,
                                        &igd_opregion_pages_base_);
     if (status != ZX_OK) {
         LOG_ERROR("Failed to map IGD OpRegion (%d)\n", status);
         return status;
     }

     igd_opregion_ = reinterpret_cast<igd_opregion_t*>(
             igd_opregion_pages_base_ + (igd_addr % PAGE_SIZE));
     if (!igd_opregion_->validate()) {
         LOG_ERROR("Failed to validate IGD OpRegion\n");
         return ZX_ERR_INTERNAL;
     }

     vbt_header_t* vbt_header = reinterpret_cast<vbt_header_t*>(&igd_opregion_->mailbox4);
     if (!vbt_header->validate()) {
         LOG_ERROR("Failed to validate vbt header\n");
         return ZX_ERR_INTERNAL;
     }

     bdb_ = reinterpret_cast<bios_data_blocks_header_t*>(
             igd_opregion_->mailbox4 + vbt_header->bios_data_blocks_offset);
     uint16_t vbt_size = vbt_header->vbt_size;
     if (!bdb_->validate()
             || bdb_->bios_data_blocks_size > vbt_size
             || vbt_header->bios_data_blocks_offset + bdb_->bios_data_blocks_size > vbt_size) {
         LOG_ERROR("Failed to validate bdb header\n");
         return ZX_ERR_INTERNAL;
     }

     // TODO(stevensd): 196 seems old enough that all gen9 processors will have it. If we want to
     // support older hardware, we'll need to handle missing data.
     if (bdb_->version < 196) {
         LOG_ERROR("Out of date vbt (%d)\n", bdb_->version);
         return ZX_ERR_INTERNAL;
     }

     if (!ProcessDdiConfigs() || !CheckForLowVoltageEdp(pci)) {
         return ZX_ERR_INTERNAL;
     }

     ProcessBacklightData();

     return ZX_OK;
 }

 }
	// Copyright 2018 The Fuchsia Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include <limits.h>
	#include <ddk/protocol/pci-lib.h>
	#include <hwreg/bitfields.h>
	#include <lib/zx/object.h>
	#include <lib/zx/vmar.h>

	#include "igd.h"
	#include "intel-i915.h"
	#include "macros.h"

	namespace {

	// Register definitions from IGD OpRegion/Software SCI documentation. Section
	// numbers reference Skylake Sept 2016 rev 0.5.

	// The number of eDP panel types supported by the IGD API
	static const uint32_t kNumPanelTypes = 16;

	// GMCH SWSCI Register - 5.1.1
	class GmchSwsciRegister : public hwreg::RegisterBase<GmchSwsciRegister, uint16_t> {
	public:
	DEF_BIT(15, sci_event_select);
	DEF_BIT(0, gmch_sw_sci_trigger);

	static auto Get() { return hwreg::RegisterAddr<GmchSwsciRegister>(0); }
	};

	// Entry half of Software SCI Entry/Exit Parameters - 3.3.1
	class SciEntryParam : public hwreg::RegisterBase<SciEntryParam, uint32_t> {
	public:
	DEF_RSVDZ_FIELD(31, 16);
	DEF_FIELD(15, 8, subfunction);
	DEF_RSVDZ_FIELD(7, 5);
	DEF_FIELD(4, 1, function);
	DEF_BIT(0, swsci_indicator);

	// Main function codes
	static const uint32_t kFuncGetBiosData = 4;

	// GetBiosData sub-function codes
	static const uint32_t kGbdaSupportedCalls = 0;
	static const uint32_t kGbdaPanelDetails = 5;

	static auto Get() { return hwreg::RegisterAddr<SciEntryParam>(0); }
	};

	// Exit half of Software SCI Entry/Exit Parameters - 3.3.1
	class SciExitParam : public hwreg::RegisterBase<SciExitParam, uint32_t> {
	public:
	DEF_RSVDZ_FIELD(31, 16);
	DEF_FIELD(15, 8, exit_param);
	DEF_FIELD(7, 5, exit_result);
	DEF_RSVDZ_FIELD(4, 1);
	DEF_BIT(0, swsci_indicator);

	constexpr static uint32_t kResultOk = 1;

	static auto Get() { return hwreg::RegisterAddr<SciExitParam>(0); }
	};

	// Additional param return value for GetBiosData supported calls function - 4.2.2
	class GbdaSupportedCalls : public hwreg::RegisterBase<GbdaSupportedCalls, uint32_t> {
	public:
	DEF_RSVDZ_FIELD(31, 11);
	DEF_BIT(10, get_aksv);
	DEF_BIT(9, spread_spectrum_clocks);
	DEF_RSVDZ_FIELD(8, 7);
	DEF_BIT(6, internal_graphics);
	DEF_BIT(5, tv_std_video_connector_info);
	DEF_BIT(4, get_panel_details);
	DEF_BIT(3, get_boot_display_preference);
	DEF_RSVDZ_FIELD(2, 1);
	DEF_BIT(0, requested_system_callbacks);

	static auto Get() { return hwreg::RegisterAddr<GbdaSupportedCalls>(0); }
	};

	// Additional param return value for GetBiosData panel details function - 4.2.5
	class GbdaPanelDetails : public hwreg::RegisterBase<GbdaPanelDetails, uint32_t> {
	public:
	DEF_RSVDZ_FIELD(31, 23);
	DEF_FIELD(22, 20, bia_ctrl);
	DEF_FIELD(19, 18, blc_support);
	DEF_RSVDZ_BIT(17);
	DEF_BIT(16, lid_state);
	DEF_FIELD(15, 8, panel_type_plus1);
	DEF_FIELD(7, 0, panel_scaling);

	static auto Get() { return hwreg::RegisterAddr<GbdaPanelDetails>(0); }
	};

	static uint8_t iboost_idx_to_level(uint8_t iboost_idx) {
	switch (iboost_idx) {
	case 0: return 1;
	case 1: return 3;
	case 2: return 7;
	default:
	LOG_INFO("Invalid iboost override\n");
	return 0;
	}
	}

	} // namespace

	namespace i915 {

	IgdOpRegion::IgdOpRegion() {}

	IgdOpRegion::~IgdOpRegion() {
	if (igd_opregion_pages_base_) {
	zx::vmar::root_self()->unmap(igd_opregion_pages_base_, igd_opregion_pages_len_);
	}
	}

	template<typename T> T* IgdOpRegion::GetSection(uint16_t* size) {
	return reinterpret_cast<T*>(GetSection(T::kBlockType, size));
	}

	uint8_t* IgdOpRegion::GetSection(uint8_t type, uint16_t* size) {
	uint8_t* data = reinterpret_cast<uint8_t*>(bdb_);
	uint16_t idx = bdb_->header_size;

	while (idx < bdb_->bios_data_blocks_size - sizeof(block_header_t)) {
	block_header_t* header = reinterpret_cast<block_header_t*>(data + idx);
	uint16_t block_size = static_cast<uint16_t>(header->size_low \| (header->size_high << 8));
	if (block_size > bdb_->bios_data_blocks_size) {
	return nullptr;
	}
	uint16_t new_idx = static_cast<uint16_t>(idx + block_size + sizeof(block_header_t));
	if (new_idx <= bdb_->bios_data_blocks_size && header->type == type) {
	*size = block_size;
	return data + idx + sizeof(block_header_t);
	}
	idx = new_idx;
	}

	return nullptr;
	}

	bool IgdOpRegion::ProcessDdiConfigs() {
	uint16_t size;
	general_definitions_t* defs = GetSection<general_definitions_t>(&size);
	if (defs == nullptr) {
	LOG_ERROR("Couldn't find vbt general definitions\n");
	return false;
	}
	if (size < sizeof(general_definitions_t)) {
	LOG_ERROR("Bad size in vbt general definitions\n");
	return false;
	}
	uint16_t num_configs = static_cast<uint16_t>(
	(size - sizeof(general_definitions_t)) / defs->ddi_config_size);
	for (int i = 0; i < num_configs; i++) {
	ddi_config_t* cfg = reinterpret_cast<ddi_config_t>(defs->ddis + i defs->ddi_config_size);
	if (!cfg->ddi_flags) {
	continue;
	}

	auto ddi_flags = DdiFlags::Get().FromValue(cfg->ddi_flags);
	uint8_t idx;
	if (cfg->port_type < 4 \|\| cfg->port_type == 12) {
	// Types 0, 1, 2, 3, and 12 are HDMI ports A, B, C, D, and E
	if (!ddi_flags.tmds()) {
	LOG_WARN("Malformed hdmi config\n");
	continue;
	}

	idx = cfg->port_type < 4 ? static_cast<registers::Ddi>(cfg->port_type)
	: registers::DDI_E;
	} else if (7 <= cfg->port_type && cfg->port_type <= 11) {
	// Types 7, 8, 9, 10, 11 are DP ports B, C, D, A, E
	if (!ddi_flags.dp()) {
	LOG_WARN("Malformed dp config\n");
	continue;
	}

	if (cfg->port_type <= 9) {
	idx = static_cast<uint8_t>(cfg->port_type - 6);
	} else if (cfg->port_type == 10) {
	idx = registers::DDI_A;
	} else {
	ZX_DEBUG_ASSERT(cfg->port_type == 11);
	idx = registers::DDI_E;
	}
	} else {
	continue;
	}

	if (ddi_supports_dvi_[idx] \|\| ddi_supports_dp_[idx]) {
	LOG_WARN("Duplicate ddi config\n");
	continue;
	}
	ddi_supports_dvi_[idx] = ddi_flags.tmds();
	ddi_supports_hdmi_[idx] = ddi_flags.tmds() && !ddi_flags.not_hdmi();
	ddi_supports_dp_[idx] = ddi_flags.dp();
	ddi_is_edp_[idx] = ddi_flags.dp() && ddi_flags.internal();

	hdmi_buffer_translation_idx_[idx] = cfg->ddi_buf_trans_idx();
	if (cfg->has_iboost_override()) {
	iboosts_[idx].dp_iboost = iboost_idx_to_level(cfg->dp_iboost_override());
	iboosts_[idx].hdmi_iboost = iboost_idx_to_level(cfg->hdmi_iboost_override());
	} else {
	iboosts_[idx].dp_iboost = 0;
	iboosts_[idx].hdmi_iboost = 0;
	}
	}

	return true;
	}

	bool IgdOpRegion::Swsci(pci_protocol_t* pci,
	uint16_t function, uint16_t subfunction, uint32_t additional_param,
	uint16_t* exit_param, uint32_t* additional_res) {
	uint16_t val;
	if (pci_config_read16(pci, kIgdSwSciReg, &val) != ZX_OK) {
	LOG_WARN("Failed to read SWSCI register\n");
	return false;
	}
	auto gmch_swsci_reg = GmchSwsciRegister::Get().FromValue(val);
	if (!gmch_swsci_reg.sci_event_select() \|\| gmch_swsci_reg.gmch_sw_sci_trigger()) {
	LOG_WARN("Bad GMCH SWSCI register value (%04x)\n", val);
	return false;
	}

	sci_interface_protocol_t* sci_interface = reinterpret_cast<sci_interface_protocol_t*>(igd_opregion_->mailbox2);

	auto sci_entry_param = SciEntryParam::Get().FromValue(0);
	sci_entry_param.set_function(function);
	sci_entry_param.set_subfunction(subfunction);
	sci_entry_param.set_swsci_indicator(1);
	sci_interface->entry_and_exit_params = sci_entry_param.reg_value();
	sci_interface->additional_params = additional_param;

	if (pci_config_write16(pci, kIgdSwSciReg,
	gmch_swsci_reg.set_gmch_sw_sci_trigger(1).reg_value()) != ZX_OK) {
	LOG_WARN("Failed to write SWSCI register\n");
	return false;
	}

	// The spec says to wait for 2ms if driver_sleep_timeout isn't set, but that's not
	// long enough. I've seen delays as long as 10ms, so use 50ms to be safe.
	int timeout_ms = sci_interface->driver_sleep_timeout ? sci_interface->driver_sleep_timeout : 50;
	while (timeout_ms-- > 0) {
	auto sci_exit_param = SciExitParam::Get().FromValue(sci_interface->entry_and_exit_params);
	if (!sci_exit_param.swsci_indicator()) {
	if (sci_exit_param.exit_result() == SciExitParam::kResultOk) {
	*exit_param = static_cast<uint16_t>(sci_exit_param.exit_param());
	*additional_res = sci_interface->additional_params;
	return true;
	} else {
	LOG_WARN("SWSCI failed (%x)\n", sci_exit_param.exit_result());
	return false;
	}
	}
	zx_nanosleep(zx_deadline_after(ZX_MSEC(1)));
	}
	LOG_WARN("SWSCI timeout\n");
	return false;
	}

	bool IgdOpRegion::GetPanelType(pci_protocol_t* pci, uint8_t* type) {
	uint16_t exit_param;
	uint32_t additional_res;
	// TODO(stevensd): cache the supported calls when we need to use Swsci more than once
	if (Swsci(pci, SciEntryParam::kFuncGetBiosData, SciEntryParam::kGbdaSupportedCalls,
	0 /* unused additional_param */, &exit_param, &additional_res)) {
	auto support = GbdaSupportedCalls::Get().FromValue(additional_res);
	if (support.get_panel_details()) {
	// TODO(stevensd): Support the case where there is >1 eDP panel
	uint32_t panel_number = 0;
	if (Swsci(pci, SciEntryParam::kFuncGetBiosData, SciEntryParam::kGbdaPanelDetails,
	panel_number, &exit_param, &additional_res)) {
	auto details = GbdaPanelDetails::Get().FromValue(additional_res);
	if (details.panel_type_plus1()
	&& details.panel_type_plus1() < (kNumPanelTypes + 1)) {
	*type = static_cast<uint8_t>(details.panel_type_plus1() - 1);
	LOG_SPEW("SWSCI panel type %d\n", *type);
	return true;
	}
	}

	}
	}

	uint16_t size;
	lvds_config_t* cfg = GetSection<lvds_config_t>(&size);
	if (!cfg \|\| cfg->panel_type >= kNumPanelTypes) {
	return false;
	}
	*type = cfg->panel_type;

	return true;
	}

	bool IgdOpRegion::CheckForLowVoltageEdp(pci_protocol_t* pci) {
	bool has_edp = true;
	for (unsigned i = 0; i < registers::kDdiCount; i++) {
	has_edp \|= ddi_is_edp_[i];
	}
	if (!has_edp) {
	LOG_SPEW("No edp found\n");
	return true;
	}

	uint16_t size;
	edp_config_t* edp = GetSection<edp_config_t>(&size);
	if (edp == nullptr) {
	LOG_WARN("Couldn't find edp general definitions\n");
	return false;
	}

	if (!GetPanelType(pci, &panel_type_)) {
	LOG_TRACE("No panel type\n");
	return false;
	}
	edp_is_low_voltage_ =
	!((edp->vswing_preemphasis[panel_type_ / 2] >> (4 * panel_type_ % 2)) & 0xf);

	LOG_TRACE("Is low voltage edp? %d\n", edp_is_low_voltage_);

	return true;
	}

	void IgdOpRegion::ProcessBacklightData() {
	uint16_t size;
	lfp_backlight_t* data = GetSection<lfp_backlight_t>(&size);

	if (data) {
	lfp_backlight_entry_t* e = &data->entries[panel_type_];
	min_backlight_brightness_ = e->min_brightness / 255.0;
	}
	}

	zx_status_t IgdOpRegion::Init(pci_protocol_t* pci) {
	uint32_t igd_addr;
	zx_status_t status = pci_config_read32(pci, kIgdOpRegionAddrReg, &igd_addr);
	if (status != ZX_OK \|\| !igd_addr) {
	LOG_ERROR("Failed to locate IGD OpRegion (%d)\n", status);
	return status;
	}

	// TODO(stevensd): This is directly mapping a physical address into our address space, which
	// is not something we'll be able to do forever. At some point, there will need to be an
	// actual API (probably in ACPI) to do this.
	zx_handle_t vmo;
	uint32_t igd_opregion_pages_len_ = kIgdOpRegionLen + (igd_addr & PAGE_SIZE);
	// Please do not use get_root_resource() in new code. See ZX-1497.
	status = zx_vmo_create_physical(get_root_resource(),
	igd_addr & ~(PAGE_SIZE - 1),
	igd_opregion_pages_len_, &vmo);
	if (status != ZX_OK) {
	LOG_ERROR("Failed to access IGD OpRegion (%d)\n", status);
	return status;
	}
	igd_opregion_pages_ = zx::vmo(vmo);

	status = zx::vmar::root_self()->map(0, igd_opregion_pages_, 0, igd_opregion_pages_len_,
	ZX_VM_PERM_READ \| ZX_VM_PERM_WRITE,
	&igd_opregion_pages_base_);
	if (status != ZX_OK) {
	LOG_ERROR("Failed to map IGD OpRegion (%d)\n", status);
	return status;
	}

	igd_opregion_ = reinterpret_cast<igd_opregion_t*>(
	igd_opregion_pages_base_ + (igd_addr % PAGE_SIZE));
	if (!igd_opregion_->validate()) {
	LOG_ERROR("Failed to validate IGD OpRegion\n");
	return ZX_ERR_INTERNAL;
	}

	vbt_header_t* vbt_header = reinterpret_cast<vbt_header_t*>(&igd_opregion_->mailbox4);
	if (!vbt_header->validate()) {
	LOG_ERROR("Failed to validate vbt header\n");
	return ZX_ERR_INTERNAL;
	}

	bdb_ = reinterpret_cast<bios_data_blocks_header_t*>(
	igd_opregion_->mailbox4 + vbt_header->bios_data_blocks_offset);
	uint16_t vbt_size = vbt_header->vbt_size;
	if (!bdb_->validate()
	\|\| bdb_->bios_data_blocks_size > vbt_size
	\|\| vbt_header->bios_data_blocks_offset + bdb_->bios_data_blocks_size > vbt_size) {
	LOG_ERROR("Failed to validate bdb header\n");
	return ZX_ERR_INTERNAL;
	}

	// TODO(stevensd): 196 seems old enough that all gen9 processors will have it. If we want to
	// support older hardware, we'll need to handle missing data.
	if (bdb_->version < 196) {
	LOG_ERROR("Out of date vbt (%d)\n", bdb_->version);
	return ZX_ERR_INTERNAL;
	}

	if (!ProcessDdiConfigs() \|\| !CheckForLowVoltageEdp(pci)) {
	return ZX_ERR_INTERNAL;
	}

	ProcessBacklightData();

	return ZX_OK;
	}

	}