The Multiblock write path was missing the the SDIO_WAITENABLE with SDIOWAIT_WRCOMPLETE. This could be seen with debugging turned on as mmcsd_eventwait: ERROR: Awakened with 10 mmcsd_transferready: ERROR: mmcsd_eventwait for transfer ready failed: -5
The Multiblock write path was missing the the SDIO_WAITENABLE with SDIOWAIT_WRCOMPLETE. This could be seen with debugging turned on as mmcsd_eventwait: ERROR: Awakened with 10 mmcsd_transferready: ERROR: mmcsd_eventwait for transfer ready failed: -5