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How to enable UHS SDR104 support in SDHCI1

Mohamed Kalilullah
Prodigy 45 points
Part Number: AM62A7

Hi,

The UHS (SDR104) support want to enable in EVM SDHCI1 controller .

Thank you
Kalilullah

  • 0
    TI__Guru**** 167581 points

    Hi Kalilullah,

    Are you using Linux on AM62A7? The Processor SDK Linux for AM62A7 already supports SDR104 mode. SDHCI1 would switch to SDR104 mode when the card supports it.

  • 0 in reply to Bin Liu
    Prodigy 45 points

    Hi Bin Liu,


    The "no-1-8-v" dts property is defined under SDHCI1 node by default in AM62A7 processor SDK Linux (ti-processor-sdk-linux-am62axx-evm-08.06.00.45).
     
    after removing this property below prints are observed with UHS card in debug console.

        root@am62axx-evm:/opt/edgeai-gst-apps# cat /sys/kernel/debug/mmc1/ios
        clock:          50000000 Hz
        actual clock:   50000000 Hz
        vdd:            21 (3.3 ~ 3.4 V)
        bus mode:       2 (push-pull)
        chip select:    0 (don't care)
        power mode:     2 (on)
        bus width:      2 (4 bits)
        timing spec:    2 (sd high-speed)
        signal voltage: 0 (3.30 V)
        driver type:    0 (driver type B)
        root@am62axx-evm:/opt/edgeai-gst-apps# dmesg | grep mmc1
        [    1.466835] mmc1: CQHCI version 5.10
        [    1.514597] mmc1: SDHCI controller on fa00000.mmc [fa00000.mmc] using ADMA 64-bit
        [    3.588654] mmc1: Skipping voltage switch
        [    3.766663] mmc1: new high speed SDHC card at address aaaa
        [    3.772649] mmcblk1: mmc1:aaaa SS08G 7.40 GiB

    Thank you,

  • 0 in reply to Mohamed Kalilullah
    TI__Guru**** 167581 points

    Hi Kalilullah,

    Sorry I didn't realize "no-1-8-v" is still defined in the device tree. I am checking internally to understand why UHS-I mode is not enabled by default in the SDK, and will keep you posted.

  • 0 in reply to Mohamed Kalilullah
    TI__Guru**** 167581 points

    Hi Kalilullah,

    The current SDK8.6 doesn't have the PMIC driver to switch the SD card IO voltage so UHS-I support is disabled. It will be enabled in SDK9.0 which will be released next month.

  • 0 in reply to Bin Liu
    Prodigy 45 points

    Hi Bin Liu,

    We want to validate our Hardware, which is having similar SD interface design like EVM.
    are you able to share this driver?
    I will integrate same in existing SDK and validate our hardware.


    Thank you

  • 0 in reply to Mohamed Kalilullah
    TI__Guru**** 167581 points

    Hi Kalilullah,

    The Processor SDK v9.0 for AM62A7 will support UHS-I. This SDK will be released in the mid of next month.