Hi Wolfram, > On Sun, Oct 06, 2013 at 02:02:13PM +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 <marex@xxxxxxx> > > Applied the series to for-next, thanks! > > > (and fixed my local pre-commit hook) > > Yay :) Thanks! It was quite a lengthy gig here ;-) Best regards, Marek Vasut -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
