# # MMC core configuration # config MMC_UNSAFE_RESUME bool "Assume MMC/SD cards are non-removable (DANGEROUS)" help If you say Y here, the MMC layer will assume that all cards stayed in their respective slots during the suspend. The normal behaviour is to remove them at suspend and redetecting them at resume. Breaking this assumption will in most cases result in data corruption. This option is usually just for embedded systems which use a MMC/SD card for rootfs. Most people should say N here. This option sets a default which can be overridden by the module parameter "removable=0" or "removable=1". config MMC_CLKGATE bool "MMC host clock gating (EXPERIMENTAL)" depends on EXPERIMENTAL help This will attempt to aggressively gate the clock to the MMC card. This is done to save power due to gating off the logic and bus noise when the MMC card is not in use. Your host driver has to support handling this in order for it to be of any use. If unsure, say N. config MMC_EMBEDDED_SDIO boolean "MMC embedded SDIO device support (EXPERIMENTAL)" depends on EXPERIMENTAL help If you say Y here, support will be added for embedded SDIO devices which do not contain the necessary enumeration support in hardware to be properly detected. config MMC_PARANOID_SD_INIT bool "Enable paranoid SD card initialization (EXPERIMENTAL)" depends on EXPERIMENTAL help If you say Y here, the MMC layer will be extra paranoid about re-trying SD init requests. This can be a useful work-around for buggy controllers and hardware. Enable if you are experiencing issues with SD detection. config MMC_FREQ_SCALING bool "Enable dynamic frequency scaling for SD/MMC/SDIO devices" depends on EXPERIMENTAL default N help If you say Y here, the MMC layer will vary the SD/MMC/SDIO device frequency dynamically. Enable this config only if there is a custom implementation to determine the frequency using the device stats.