On 23/08/18 07:32, Yinbo Zhu wrote: > In tuning mode of operation, when TBCTL[TB_EN] is set, eSDHC may report > one of the following errors : > 1)Tuning error while running tuning operation where SYSCTL2[SAMPCLKSEL] > will not get set even when SYSCTL2[EXTN] is reset. OR > 2)Data transaction error (e.g. IRQSTAT[DCE], IRQSTAT[DEBE]) during data > transaction errors. > This issue occurs when the data window sampled within eSDHC is in full > cycle. So, in that case, eSDHC is not able to find out the start and > end points of the data window and sets the sampling pointer at default > location (which is middle of the internal SD clock). If this sampling > point coincides with the data eye boundary, then it can result in the > above mentioned errors. Impact: Tuning mode of operation for SDR50, > SDR104 or HS200 speed modes may not work properly > Workaround: In case eSDHC reports tuning error or data errors in tuning > mode of operation, by add the erratum A008171 support to fix the issue. > > Signed-off-by: Yinbo Zhu <yinbo.zhu@xxxxxxx> > --- > Change in v5: > Modify some return value for tuning procedure. > > drivers/mmc/host/sdhci-esdhc.h | 1 + > drivers/mmc/host/sdhci-of-esdhc.c | 44 ++++++++++++++++++++++++++++++++++++- > drivers/mmc/host/sdhci.c | 9 ++++--- > drivers/mmc/host/sdhci.h | 1 + Please make the sdhci.[ch] changes a separate patch
