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commitaf8a41cccfupstream. Some HP laptops have only a single wifi antenna. This would not be a problem except that they were shipped with an incorrectly encoded EFUSE. It should have been possible to open the computer and transfer the antenna connection to the other terminal except that such action might void the warranty, and moving the antenna broke the Windows driver. The fix was to add a module option that would override the EFUSE encoding. That was done with commitc18d8f5095("rtlwifi: rtl8723be: Add antenna select module parameter"). There was still a problem with Bluetooth coexistence, which was addressed with commitbaa1702290("rtlwifi: btcoexist: Implement antenna selection"). There were still problems, thus there were commit0ff78adeef("rtlwifi: rtl8723be: fix ant_sel code") and commit6d62269283("rtlwifi: btcoexist: Fix antenna selection code"). Despite all these attempts at fixing the problem, the code is not yet right. A proper fix is important as there are now instances of laptops having RTL8723DE chips with the same problem. The module parameter ant_sel is used to control antenna number and path. At present enum ANT_{X2,X1} is used to define the antenna number, but this choice is not intuitive, thus change to a new enum ANT_{MAIN,AUX} to make it more readable. This change showed examples where incorrect values were used. It was also possible to remove a workaround in halbtcoutsrc.c. The experimental results with single antenna connected to specific path are now as follows: ant_sel ANT_MAIN(#1) ANT_AUX(#2) 0 -8 -62 1 -62 -10 2 -6 -60 Signed-off-by: Ping-Ke Shih <pkshih@realtek.com> Fixes:c18d8f5095("rtlwifi: rtl8723be: Add antenna select module parameter") Fixes:baa1702290("rtlwifi: btcoexist: Implement antenna selection") Fixes:0ff78adeef("rtlwifi: rtl8723be: fix ant_sel code") Fixes:6d62269283("rtlwifi: btcoexist: Fix antenna selection code") Cc: Stable <stable@vger.kernel.org> # 4.7+ Reviewed-by: Larry Finger <Larry.Finger@lwfinger.net> Signed-off-by: Kalle Valo <kvalo@codeaurora.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.