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    i2c: rk3x: handle dynamic clock rate changes correctly · 249051f4
    Max Schwarz 提交于
    The i2c input clock can change dynamically, e.g. on the RK3066 where
    pclk_i2c0 and pclk_i2c1 are connected to the armclk, which changes
    rate on cpu frequency scaling.
    
    Until now, we incorrectly called clk_get_rate() while holding the
    i2c->lock in rk3x_i2c_xfer() to adapt to clock rate changes.
    Thanks to Huang Tao for reporting this issue.
    
    Do it properly now using the clk notifier framework. The callback
    logic was taken from i2c-cadence.c.
    
    Also rename all misleading "i2c_rate" variables to "clk_rate", as they
    describe the *input* clk rate.
    Signed-off-by: NMax Schwarz <max.schwarz@online.de>
    Tested-by: Doug Anderson <dianders@chromium.org> on RK3288
    Reviewed-by: NDoug Anderson <dianders@chromium.org>
    Signed-off-by: NWolfram Sang <wsa@the-dreams.de>
    249051f4
i2c-rk3x.c 24.3 KB