[PATCH v7] i2c: rk3x: handle dynamic clock rate changes correctly
wsa at the-dreams.de
Fri Nov 21 10:18:34 PST 2014
On Thu, Nov 20, 2014 at 10:26:50AM +0100, Max Schwarz wrote:
> 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: Max Schwarz <max.schwarz at online.de>
> Tested-by: Max Schwarz <max.schwarz at online.de> on RK3188
Superfluous, I assume that you tested a patch when you send it :)
> Tested-by: Doug Anderson <dianders at chromium.org> on RK3288
> Reviewed-by: Doug Anderson <dianders at chromium.org>
Please drop such tags when there are significant changes between the
revisions (which happened here). They need to be sent again explicitly,
so I know really this version has been worked on.
So, Doug, please confirm those tags.
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