db04b755ed
The mcs index of HT mode is 0 to 31, please refer http://mcsindex.com/. Its spatial stream(Nss) number is from 1 to 4, mcs index is 0~7 for Nss=1, 8~15 for Nss=2, 16~23 for Nss=3 and 24~31 is for Nss=4. The mcs is reported from firmware in wmi_tlv_peer_stats_info of event WMI_TLV_PEER_STATS_INFO_EVENTID, its range is from 0~15 for QCA6174 SDIO and PCIe. It is for both Nss=1 and Nss=2, and it has 2 rate table supported_ht_mcs_rate_nss1 and supported_ht_mcs_rate_nss2 in ath10k, they are for Nss=1 and Nss=2, each table has 8 rates. It need to find the matched row number with the mcs index, for example, mcs index is 2, it is <=7, so it is Nss=1, and match row 2 in table of Nss=1. If mcs index is 12, it is >= 8 and <= 15, so it is Nss=2, it match row 4(12-8) in table of Nss=2. If mcs index is >=16, it is for Nss=3/4, it need to add rate table, so it is not support in current ath10k. This patch is to find the row number in rate table of Nss=1 or Nss=2 with the mcs index reported from firmware. This patch only effect the chips which supports_peer_stats_info of its hw_params is true, it is true only for QCA6174 currently. Tested-on: QCA6174 hw3.2 SDIO WLAN.RMH.4.4.1-00048 Tested-on: QCA6174 hw3.2 PCI WLAN.RM.4.4.1-00110-QCARMSWP-1 Signed-off-by: Wen Gong <wgong@codeaurora.org> Signed-off-by: Kalle Valo <kvalo@codeaurora.org> Link: https://lore.kernel.org/r/1597392294-13124-1-git-send-email-wgong@codeaurora.org
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.
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.