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7abf56eed1
DeviceClass::reset models a "cold power-on" reset which can
also be used to powercycle a device; but there is no "hot reset"
(a.k.a. soft-reset) method available.
The OMAP MMC Power-Up Control bit is not designed to powercycle
a card, but to disable it without powering it off (pseudo-reset):
Multimedia Card (MMC/SD/SDIO) Interface [SPRU765A]
MMC_CON[11] Power-Up Control (POW)
This bit must be set to 1 before any valid transaction to either
MMC/SD or SPI memory cards.
When 1, the card is considered powered-up and the controller core
is enabled.
When 0, the card is considered powered-down (system dependent),
and the controller core logic is in pseudo-reset state. This is,
the MMC_STAT flags and the FIFO pointers are reset, any access to
MMC_DATA[DATA] has no effect, a write into the MMC.CMD register
is ignored, and a setting of MMC_SPI[STR] to 1 is ignored.
By splitting the 'pseudo-reset' code out of the 'power-on' reset
function, this patch fixes a latent bug in omap_mmc_write(MMC_CON)i
recently exposed by
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| .. | ||
| bcm2835_sdhost.c | ||
| core.c | ||
| Makefile.objs | ||
| milkymist-memcard.c | ||
| omap_mmc.c | ||
| pl181.c | ||
| pxa2xx_mmci.c | ||
| sd.c | ||
| sdhci-internal.h | ||
| sdhci.c | ||
| sdmmc-internal.c | ||
| sdmmc-internal.h | ||
| ssi-sd.c | ||
| trace-events | ||