On Sat, Aug 27, 2016 at 03:39:30PM +0800, Zhuo-hao Lee wrote: > There are several ways to set the SDA hold time for i2c controller, > including: Device Tree, built-in device properties and ACPI. However, > if the SDA hold time is not specified by above method, we should > read the value, where it is preset by firmware, and save it to > sda_hold_time. This is needed because when i2c controller enters > runtime suspend, the DW_IC_SDA_HOLD value will be reset to chipset > default value. And during runtime resume, i2c_dw_init will be called > to reconfigure i2c controller. If sda_hold_time is zero, the chipset > default hold time will be used, that will be too short for some > platforms. Therefore, to have a better tolerance, the DW_IC_SDA_HOLD > value should be kept by sda_hold_time. > > Signed-off-by: Zhuo-hao Lee <zhuo-hao.lee@xxxxxxxxx> Applied to for-current, thanks!
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