• Alexey Brodkin's avatar
    board: axs10x - cap max SDIO clock value to bus/2 · f6e27ba5
    Alexey Brodkin authored
    It turned out with some boards (FPGA firmwares?) and cards combos
    current clock settings doesn't work as expected leading to strange
    card freezes or corrupted data being read from the card.
    
    Especially this was seen with Transcend 2Gb cards shipped as a part of
    ARC SDP:
    ----------------->8---------------
    AXS# mmcinfo
    Device: Synopsys Mobile storage
    Manufacturer ID: 74
    OEM: 4a60
    Name: SDC
    Tran Speed: 50000000
    Rd Block Len: 512
    SD version 3.0
    High Capacity: No
    Capacity: 1.8 GiB
    Bus Width: 4-bit
    Erase Group Size: 512 Bytes
    AXS# fatload mmc 0
    ** Unrecognized filesystem type **
    ----------------->8---------------
    
    With this change that problem is fixed.
    Note "Tran Speed" above doesn't match clock value set in DW MMC.
    It is max value for card's speed class.
    Signed-off-by: default avatarAlexey Brodkin <abrodkin@synopsys.com>
    f6e27ba5
axs101.c 1.74 KB