kernel-3.12.0: MMC fails to initialise #423
Description
When booting with a USB root-filesystem:
[ 4.766800] sdhci: Secure Digital Host Controller Interface driver
[ 4.774901] sdhci: Copyright(c) Pierre Ossman
[ 4.781188] sdhci: Enable low-latency mode
[ 4.787208] mmc0: Hardware doesn't report any support voltages.
[ 4.795020] bcm2708_sdhci bcm2708_sdhci.0: probe failed, err -19
This may be a timing issue, as the 'rootwait' parameter hasn't paused until the SDHC controller has become available - but this same configuration worked correctly with the 3.10.y kernels. I had unrelated problems with 3.11.y, so don't know if this series had the same issue.
err == -19 looks to be -ENODEV, which seems to suggest that 'sdhci_alloc_host' is failing - although this would seem to return -ENOMEM on error.
Relevant configuration:
CONFIG_MMC=y
# CONFIG_MMC_DEBUG is not set
CONFIG_MMC_UNSAFE_RESUME=y
CONFIG_MMC_CLKGATE=y
# MMC/SD/SDIO Card Drivers
CONFIG_MMC_BLOCK=y
CONFIG_MMC_BLOCK_MINORS=8
CONFIG_MMC_BLOCK_BOUNCE=y
# CONFIG_MMC_TEST is not set
# MMC/SD/SDIO Host Controller Drivers
# CONFIG_MMC_ARMMMCI is not set
CONFIG_MMC_SDHCI=y
CONFIG_MMC_SDHCI_IO_ACCESSORS=y
# CONFIG_MMC_SDHCI_PLTFM is not set
# CONFIG_MMC_SDHCI_PXAV3 is not set
# CONFIG_MMC_SDHCI_PXAV2 is not set
CONFIG_MMC_SDHCI_BCM2708=y
CONFIG_MMC_SDHCI_BCM2708_DMA=y
# CONFIG_MMC_SPI is not set
# CONFIG_MMC_DW is not set
# CONFIG_MMC_VUB300 is not set
# CONFIG_MMC_USHC is not set