IMX8MM SD UHS support

[Fabio Estevam]

Hi Tim,

On Wed, Dec 30, 2020 at 1:54 PM Tim Harvey <tharvey at gateworks.com> wrote:

> Andrey,
>
> I did mention that I am using the imx8mm-evk. When I saw that my
> custom board was having issues with sd_get_capabilities() I switched
> to the imx8mm-evk and confirmed my findings there.
>
> I'm using master (ab865a8ee5c1) with imx8mm_evk_defconfig running on
> an imx8mm-evk board configured via dip switches to boot from eMMC. I
> have a SDR104 microSD which detects and operates as such in Linux and
> this is what I see in U-Boot:
>
> U-Boot SPL 2021.01-rc4-00029-gab865a8 (Dec 30 2020 - 08:29:24 -0800)
> Normal Boot
> WDT:   Started with servicing (60s timeout)
> Trying to boot from MMC2
>
>
> U-Boot 2021.01-rc4-00029-gab865a8 (Dec 30 2020 - 08:29:24 -0800)
>
> CPU:   Freescale i.MX8MMQ rev1.0 at 1200 MHz
> Reset cause: POR
> Model: FSL i.MX8MM EVK board
> DRAM:  2 GiB
> WDT:   Started with servicing (60s timeout)
> MMC:   FSL_SDHC: 1, FSL_SDHC: 2
> Loading Environment from MMC... OK
> In:    serial
> Out:   serial
> Err:   serial
> Net:   eth0: ethernet at 30be0000
> Hit any key to stop autoboot:  0
> u-boot=> mmc dev 1
> Run CMD11 1.8V switch
> switch to partitions #0, OK
> mmc1 is current device
> u-boot=> mmc info
> Device: FSL_SDHC
> Manufacturer ID: 1b
> OEM: 534d
> Name: 00000
> Bus Speed: 50000000
> Mode: SD High Speed (50MHz)
> Rd Block Len: 512
> SD version 3.0
> High Capacity: Yes
> Capacity: 14.9 GiB
> Bus Width: 4-bit
> Erase Group Size: 512 Bytes
>
> You can see that the 1.8V switch succeeds and the card is recognized
> as high-speed but does not show the SDR104 capability.

Could you please test this patch from Adam?
https://patchwork.ozlabs.org/project/uboot/patch/20201230173907.2891555-1-aford173@gmail.com/