Hi Wolfram-san, > From: Wolfram Sang, Sent: Tuesday, December 17, 2019 8:41 PM > > R-Car Gen3 cannot use correction error status with HS400. > HS200: CMD and DAT signal timing are based on CLK signal. > HS400: CMD signal is based on CLK. DAT signal is based on DS signal. > > In HS400, CMD signal is 200MHz(SDR). DAT signal is 200MHz(DDR). > Center position of signal is different between CMD and DAT. > > TAP position should be adjusted to the center position of CMD signal. > DAT sampling timing is adjusted by HS400 calibration circuit regardless > of TAP position. Refer to renesas_sdhi_adjust_hs400mode_enable(). > > However, correction error status contains CMD and DAT status in HS400 > (DAT signal is not masked in HS400). Therefore, correction error status > cannot use in HS400. It means that auto correction cannot be uses in > HS400. Manual correction can change to the correct TAP position by > ignoring DAT correction error status and using only CMD correction > status. > > Signed-off-by: Takeshi Saito <takeshi.saito.xv@xxxxxxxxxxx> > [wsa: refactored patch from BSP] > Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx> Thank you for the patch! Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx> Best regards, Yoshihiro Shimoda
