mmc: zynq_sdhci: Allow configuring zero Tap values
Allow configuring ITAP and OTAP values with zero to avoid failures in some cases (one of them is SD boot mode). Legacy, SDR12 modes require to program the ITAP and OTAP values as zero, whereas for SDR50 and SDR104 modes ITAP value is zero. In SD boot mode firmware configures the SD ITAP and OTAP values and in this case u-boot has to re-configure required tap values(including zero) based on the operating mode. Signed-off-by: NAshok Reddy Soma <ashok.reddy.soma@xilinx.com> Reviewed-by: NJaehoon Chung <jh80.chung@samsung.com> Signed-off-by: NMichal Simek <michal.simek@xilinx.com>
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