Re: [PATCH] i2c: i2c_mxs: Set ACK_MODE bit

[Wolfram Sang <wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org>]

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On Tue, Jul 02, 2013 at 01:01:00PM -0300, Fabio Estevam wrote:
> According to mx23 erratum 2727:
> 
> "2727 : I2C 9th Clock Pulse (ACK) not generated when RETAIN_CLOCK set.
> 
> Description:
> 
> When RETAIN_CLOCK is set, the ninth clock pulse (ACK) is not generated. 
> However, the SDA line is read at the proper timing interval. If 
> RETAIN_CLOCK is cleared, the ninth clock pulse is generated.
> Also, the HW_I2C_VERSION register incorrectly states the version is 1.2. 
> It should be 1.3.
> 
> Workaround:
> HW_I2C_CTRL1[ACK_MODE] has default value of 0. It should be set to 1 to 
> enable the fix for this issue."
> 
> It has also been noticed that mx28 needs to implement this fix in order to have
> SMBus to work properly.
> 
> Reported-by: Christoph Baumann <cb-/RsSufbtIHM@public.gmane.org>
> Signed-off-by: Fabio Estevam <fabio.estevam-KZfg59tc24xl57MIdRCFDg@public.gmane.org>

What's with this one? Bogus? Needed? Still needed after PIO rework?


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