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  1. Jan 08, 2015
    • Gregory Nutt's avatar
    • Gregory Nutt's avatar
      Update ChangeLog · 1b011146
      Gregory Nutt authored
      1b011146
    • Gregory Nutt's avatar
      MMCSD SDIO: Add support for a new SDWAIT_WRCOMPLETE condition. The previous... · 1842525c
      Gregory Nutt authored
      MMCSD SDIO:  Add support for a new SDWAIT_WRCOMPLETE condition.  The previous logic used a busy-wait loop to pool the card R1 start to determine when the card was ready for the next transfer.  That busy-wait can be quite long -- hundreds of milliseconds.  And alternative is to look the the SD D0 pin which will change state when the card is no longer busy.
      
      This logic implements a change the avoids the busy-wait poll by reconfiguring the SD D0 pin as a GPIO interrupt, then waiting for the card to becom ready without taking up CPU cycles.
      
      This change is conditioned on CONFIG_MMCSD_SDIOWATI_WRCOMPLETE and is currenlty only implemented for the STM32 SDIO driver.
      
      From David Sidrane
      1842525c
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