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To support dual-band variant of QCA9984, new extended board data (eBDF) is introduced since existing board data ran out of space. Below is the brief implementation & design detail, ---------------------------------------------------- 1. New OTP changes to inform eBDF support in existing OTP download to fetch board ID and chip ID. This is backward compatible and older card sends 0 by default for eBDF support bit (bit 18 of OTP response) we check in ath10k driver. 2. If eBDF is supported, then we need to fetch eBDF ID which is bundled in downloaded board data. So again OTP is executed for knowing the eBDF ID. This is done once we set 'board_data_initialized' bit. If eBDF ID returned is zero, we continue booting with previous board data downloaded. 3. Based on the eBDF ID fetched, ath10k driver tries to download the extended board data to a new offset ahead of already downloaded board data address. 4. A new BD IE type, ATH10K_BD_IE_BOARD_EXT is added to differentiate in bundling eBDF separately in board-2.bin and also to parse through board bundle for eBDF download in ath10k boot. 5. If eBDF is not present in the board-2.bin bundle or when board ID is zero, we do a fallback boot to "eboard.bin" in the same QCA9984/hw1.0 dir. This is same as done to existing "board.bin" if board ID is not present in board-2.bin bundle. Current design is that eBDF size will be 2KB and eBDF ID will be byte value. Tested the above changes with dual-band variant of QCA9984 card. OTP update needed for the test will be part of next FW release 10.4-3.6-xxxx. Below are the logs with ath10k BOOT debugs enabled. First OTP response : --------------------- .. boot upload otp to 0x1234 len 9478 for board id boot get otp board id result 0x00040400 board_id 1 chip_id 0 ext_bid_support 1 .. Second OTP response : --------------------- .. boot upload otp to 0x1234 len 9478 for ext board id boot get otp ext board id result 0x00000005 ext_board_id 5 boot using eboard name 'bus=pci,bmi-chip-id=0,bmi-eboard-id=5' .. Extended board data download: ------------------------------ .. board name 00000000: 62 75 73 3d 70 63 69 2c 62 6d 69 2d 63 68 69 70 bus=pci,bmi-chip 00000010: 2d 69 64 3d 30 2c 62 6d 69 2d 65 62 6f 61 72 64 -id=0,bmi-eboard 00000020: 2d 69 64 3d 35 -id=5 boot found match for name 'bus=pci,bmi-chip-id=0,bmi-eboard-id=5' boot found eboard data for 'bus=pci,bmi-chip-id=0,bmi-eboard-id=5' using board api 2 boot writing ext board data to addr 0xc3000 .. Fallback Extended board data download from "eboard.bin": --------------------------------------------------------- .. board name 00000000: 62 75 73 3d 70 63 69 2c 62 6d 69 2d 63 68 69 70 bus=pci,bmi-chip 00000010: 2d 69 64 3d 30 2c 62 6d 69 2d 62 6f 61 72 64 2d -id=0,bmi-board- 00000020: 69 64 3d 31 30 id=10 failed to fetch board data for bus=pci,bmi-chip-id=0,bmi-eboard-id=5 from ath10k/QCA9984/hw1.0/board-2.bin boot fw request 'ath10k/QCA9984/hw1.0/eboard.bin': 0 using board api 1 boot writing ext board data to addr 0xc3000 .. Signed-off-by: Sathishkumar Muruganandam <murugana@codeaurora.org> Signed-off-by: Kalle Valo <kvalo@codeaurora.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.