Check for card detect each time an MMC/SD device is initialized. If card detection is not implemented, this code behaves as before and continues assuming a card is present. If no card is detected, has_init is reset for the MMC/SD device (to force initialization next time) and an error is returned. Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de> Tested-by: Jason Liu <jason.hui@linaro.org>master
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