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584ce30c72
The current code for checking and fixing the weekday in ds1307_probe faces some issues: - This check is applied to all chips even if its applicable (AFAIK) to mcp794xx only - The check uses MCP794XX constants for registers and bits even though it's executed also on other chips (ok, this could be fixed easily) - It relies on tm_wday being properly populated when core calls set_time and set_alarm. This is not guaranteed at all. First two issue we could solve by moving the check to the mcp794xx-specific initialization (where also VBATEN flag is set). The proposed alternative is in the set_alarm path for mcp794xx only and calculates the alarm weekday based on the current weekday in the RTC timekeeping regs and the difference between alarm date and current date. So we are fine with any weekday even if it doesn't match the date. Still there are cases where this could fail, e.g.: - rtc date/time + weekday have power-on-reset default values - alarm is set to actual date/time + x - set_time is called (may change diff between rtc weekday and actual weekday) But similar issues we have with the current code too: - rtc date/time + weekday have power-on-reset default values - alarm is set to rtc date/time + x - set_time is called before the alarm triggers Using random rtc date/time with relative alarms simply can interfere with set_time. I'm not totally convinced of either option yet. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> |
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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.