[intel-i915] Load clock rate from DP transcoder

Configuring a transcoder for DP requires knowing the pixel clock rate.
Since we reallocate transcoders rather aggressively, we need to load
the pixel clock rate from hardware if we're reusing the BIOS display
configuration.

Test: Run gfxtest on a NUC with 2 DP monitors and make sure both
monitors work after the test finishes.

Change-Id: I8fc96f45d6d3ca21c2cc316f05604b616f6f1c0f

[intel-i915] Be more aggressive about reusing HW state

There are still displays that the Intel display driver has trouble
initializing. The BIOS is generally more reliable, so skip checking
certain less-important timing flags to more aggressively reuse the BIOS
initialization.

Bug: ZX-2539
Test: Boot to virtcon and run display-test on previously-failing display
Change-Id: I07ce3ac868bfd64c78d01995a5e7832cbc3700bc

[intel-i915] Init backlight when skipping display init

BUG: SU-22
Test: Check that backlight cmdline utility works
Change-Id: I432fc7f57aab1f0bdcfbb493f95f2b542e5f2d0c

[intel-i915] Read hardware state at initialization

Test: Boot to virtcon on NUC/eve, run display-test
Change-Id: Ie64e56eb46097db82bf3e9d6354b83024a8d89f1

[display] Move edid handling to core driver

Test: Boot to virtcon/hotplugging on NUC/eve/acer
Change-Id: Id531728ca7d218584cddc881d6635737abd1b55a

[intel-i915] Split i2c/dp_aux into separate objects

Test: Boot to virtcon on NUC/eve
Change-Id: If2d56129c7818fc5a7dd73ba18e5b92aef37d07c

[intel-i915] Clean up ddi configuration

This change does some small refactoring around what should be done when
configuring a DDI (i.e. when the display is plugged in) and what should
be done during modesetting.

Test: Boot to virtcon/modesetting on NUC/eve
Change-Id: If42b597f1b66f05afbb95c9079d19b8803a63248

[intel-i915] Don't detach pipe when changing mode

Test: display-test --mode-set
Change-Id: I7efe8bca6c67508a45f8cd14e170cd3bc52db45a

[intel-i915] Separate ddis from pipes/transcoders

This change creates a standalone Pipe class which manages hardware
pipes and transcoders, which leaves displays to only manage ddis. This
allows more dynamic configuration of the hardware.

Test: Virtcon and hotplugging on skl NUC/kbl NUC/eve/acer, virtcon
switching, boot menu, display-test, vkcube on skl NUC.

Change-Id: I845ec143b14866099f7b17840dfe24492f6e5909

[intel-i915] Don't require modesetting on boot

This reverts commit a9bb0f96899d3583748d87be7ed84a58a433d312, as the
modesetting required by that change doesn't reliably complete on some
hardware. To prevent regressing the specific issue fixed by the
reverted change, this change also makes setting PIPE_SRCSZ occur
unconditionally when applying a configuration.

Test: Boot to virtcon from boot menu. Boot to virtcon successfully on
kaby lake NUC.
Bug: ZX-2418
Change-Id: I3a7a20dad79bc14a2580f6e5060268e22f70170a

[intel-i915] Don't assume the preferred display mode

Don't initialize the display_mode_t info with the preferred display
timing, since it's possible that the display was initialized with some
other mode.

Test: Boot to virtcon from boot menu
Change-Id: I07dabfa846167c6d15e3d549e1ca2d5baba0f1ec

[display][edid] Add DTM and CEA timings

Test: display-test modesetting on NUC/vim2
Change-Id: I5aed7a701872da2af2ee48823dda0973f69d10f3

[intel-i915] Fix DP hotplugging

Test: display-test works with a hotplugged DP monitor
Change-Id: Iacb64c37af080240e5c92bb43de938e90389d685

[display][intel-i915] Fix uninitialized memory usage

This also cancels a wait which causing an assert following the reported
crash.

Bug: SCN-831 #done
Test: vkcube followed by set_root_view vkcube
Change-Id: I9cfecbbe530379415a1daa6ff0ba6209364ce15c

[intel-i915] Write double-buffer arming registers together

Intel hardware does not support atomic updates for a whole composition
configuration, so group the register writes which arm the changes into
per-pipe batches to reduce the chance of partial applications.

Test: display-test
Change-Id: I288739d217e020f5c867b6d23c2701e44dbfb481

[intel-i915] Support layer scaling

Test: display-test
Change-Id: I6c6b9835d91e95d7911b1b47a20eaf21ec13ec2a

[display] Add support for color layers

Test: display-test
Change-Id: I270351824d264e5c905a74b43a2c09079059bd94

[display] Add layer alpha API

Test: manually run display-test
Change-Id: I8d6791f5ad286d54bca130e0d156010e61c3539d

[display] Add support for color space conversion

Test: manually run display-test
Change-Id: I81e2bcec9d7b800b572b8f579aa6eb8b57792894

[ddk][intel-i915] Add support for hardware cursors

Test: Manually run display-test
Change-Id: Id413e27cd9ee938c689495eee6bb58ad44ff8223

[device][intel-i915] Add reading backlight state from device.

This changelist exposes the current backlight state from the i915
driver. The returned values mirror those provided through the set
API.

Test: run "backlight --read" from shell and verify returned values.
Bug: SY-411
Change-Id: Ib46d8da928cb6786dbc8a50bc55f056f3a38eea2

[device][intel-i915] Add backlight device

Expose v0 backlight controls from i915 display driver.

Test: Manual testing with new backlight utility
Change-Id: I23b85894f2b1663df1914b5a127a74548d2580d1

[intel-i915] Add support for rotation

This is a revert of the revert 455cc09565a4f9018cd9921e9184d857bc5b7133
with an additional fix in DdkSuspend to fix crashing during mexec.

Test: display-test, boot with zedboot image including change
Change-Id: I55dcbd21496155357c30d5ac6a83215c642f8d9a

[intel-i915] Reverting: Add support for rotation

This reverts commit d6377109658b0e074dc853474febb2016be4cff3.

Reason for revert: This commit generates a zedboot that fails
to boot the system on pixelbook.

Original change's description:
> [intel-i915] Add support for rotation
>
> Test: display-test
> Change-Id: I4fdc948584acd76b4aab9a5044299449fd18b059

Change-Id: Iba0f2bda1819da230cb778961fcbe5bb7df5500a

[display][intel-i915] Add support for modesetting

Change-Id: I6a2a8a5ecae1514ae87ee2fb4c6511578d376fa4

[intel-i915] Add support for rotation

Test: display-test
Change-Id: I4fdc948584acd76b4aab9a5044299449fd18b059

[display] Add layers to ddk display protocol

Change-Id: I0e876353121ca8c58bcca4a5c0ada6ee61d0e259

[intel-i915] Clean up intel driver logging

Change-Id: I3873a7460d31cb0c94ef8cb00266f9598fa9f3d2

[display] Set zx framebuffer in core display driver

Change-Id: Id8d3638aa3a5a842ae8c623d32a1604d1038a511

[edid] Make the edid API mirror the underlying format

Change-Id: I580c3f61f7b31039e6abfc281958b62127473d3d

[intel-i915] Delete old display device implementation

Change-Id: I1e253629778288952ed3dc83111b84a0aac4a29f

[display] Use uint64_t for ids

Change-Id: I8538e3e53978045bc55a8d4116acf90393dbfdf8

[intel-i915] Add support for buffer tiling

Change-Id: Ib8bd40a07f086a4f65625a25560d2dfc84634605

[intel-i915] Add locking

Change-Id: I067fb1bb9a8db020d8f80272c12ec732cd15238a

[intel-i915] Implement intel-gpu-core protocol

Also change the address type in read_pci_config_16 to uint16_t, to
match the underlying pci API.

Change-Id: Ic16e79939ea5114c545809f993ff7ad1e2e93d86

[intel-i915] Add display controller implementation

Change-Id: Ic512b89645b512629eb42b7b54563c7369b2060b

[zx] Move public zx headers to match naming convention

The zx library provides headers intended for general use, so the
include path should be spelled <lib/zx/foo.h> as per
https://fuchsia.googlesource.com/docs/+/master/development/languages/c-cpp/naming.md.
This moves the headers into the proper location and updates includes to
match.

Change-Id: I6fc9b2a491b5f8b0d270c4dfc77fa4be5739071b

[intel-i915][edid] Create standalone edid library

Change-Id: I0bceb8ef276b836e25c89830ff155c8a02965a97

[dev][i915] Teach Intel graphics about BTIs

ZX-693 #comment

Change-Id: I09b00e34fdfb797bb39c22b109661c70a2a4c676

[intel-i915] Map framebuffers as write-combining

Change-Id: I5738e52590ce615b2bdebef133e7507479b0d45e

[intel-i915] Improve dpll allocation

Share dplls when possible. Also, given that the sparse documentation on
HDPORT makes it difficult to be confident in how the feature is
handled, just ignore it for now. Support can be needed when something
actually needs it and better documentation is available.

Change-Id: I186de9959bd9f1e7521c3333abb306aae4acfaea

[intel-i915] Only enable power wells when in use

Change-Id: I4cde102b41ef4a39f19f6c71a2de2725bfb34b10

[intel-i915] Use pixel size when computing stride

Change-Id: Ia145ee1c3ec3cc739570a02ae1ff057ab4a6af58

[intel-i915] Reinitialize displays on resume

Change-Id: I22449d4896d331c4808a9341ab5ea325a45a7472

[intel-i915] Handle transcoder EDP and DPLL0

Change-Id: Idc68e8f6932b38c0b7929b81ea50c4bcd54e6a8f

[intel-i915] Make the bootloader fb work on mexec

Change-Id: Ia8a95fd2fbcfd366bf02a8b9adb8192bc6bff139

[intel-i915] Back unused gfxmem with a scratch buffer

There are times during driver initialization and when mexecing where
there is nothing good to put on the display. To handle those cases,
back all unused graphics memory with a black scratch buffer (which is
quicker and easier than turning the display off and back on).

Change-Id: I9767dc1c6e14646f5e84effce8712c5ee908882e

[intel-i915] Add support for hotplugging

Change-Id: Idbc2721499a5b18acbb395d26b63bf13d08c79a0

[intel-i915] Add allocator to gtt

Change-Id: I49ecd0797938b3975701ccea566d90023d7d8928

[system][intel-i915] SKU specific DDI_BUF_TRANS values

Skylake PCI ids were taken from IHD-OS-SKL-Vol 4-05.16. Kaby lake PCI
ids were taken from IHD-OS-KBL-Vol 4-1.17. Skylake register tables were
taken from IHD-OS-SKL-Vol 12-05.16. Kaby lake register tables were
taken from IHD-OS-KBL-Vol 12-1.17.

Change-Id: Ie6b6b963c54e6c239efb50eddff15d6d936e25d0

[intel-i915] Determine HDMI vs DVI from edid

Change-Id: I129e183e7ec5c1b3b9244f1a17aacc35a531fe0a

[dev][i915] Switch code over to hwreg lib

The hwreg code is derived from registers-base.h and has support for
additional features (like reserved-zero bits).

Change-Id: I1476a23de273896e029c99231833d30d4105e3cd

[system][intel-i915] Improve display controller init

- Reset all pipes and ddis.
- Do fixed-allocation of display buffers across all pipes.

Change-Id: Iebca855147f0a9cb9cfe0465fa7e57656272c352

[system][intel-i915] Reset hardware when needed

Change-Id: I42a356ab099a6669e94d9fa49b8f92eaef38cdbe

[system][intel-i915] Add HDMI configuration

The bulk of this logic is disabled behind a #define flag.

Change-Id: I3240895203b71bfa4fc61f2a7df723bae55ede71

[dev][intel-i915] Create dedicated display class

Change-Id: I98e1a550ded205f66c56a74e98873478645b8e3c