On 08/15/2013 07:08 AM, Wolfram Sang wrote:
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@xxxxxxx>
Signed-off-by: Fabio Estevam <fabio.estevam@xxxxxxxxxxxxx>
What's with this one? Bogus? Needed? Still needed after PIO rework?
According to the mx23 erratum 2727 this patch is needed.
Regards,
Fabio Estevam
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