On Mon, Sep 30, 2013 at 01:23:54AM +0200, Marek Vasut wrote: > Analyze and rework the PIO mode operation. The PIO mode operation > was unreliable on MX28, by analyzing the bus with LA, the checks > for when data were available or were to be sent were wrong. > > The PIO WRITE has to be completely reworked as it multiple problems. > The MX23 datasheet helped here, see comments in the code for details. > The problems boil down to: > - RUN bit in CTRL0 must be set after DATA register was written > - The PIO transfer must be 4 bytes long tops, otherwise use > clock stretching. > Both of these fixes are implemented. > > The PIO READ operation can only be done for up to four bytes as > we are unable to read out the data from the DATA register fast > enough. > > This patch also tries to document the investigation within the > code. > > Signed-off-by: Marek Vasut <[email protected]>
Yay, there it is. Thanks, looks good to me. Will wait a few days so people can donate Tested-by tags.
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