On Thu, Sep 16, 2021 at 4:32 PM Tim Harvey tharvey@gateworks.com wrote:
Greetings,
Can anyone confirm if IMX8MM UHS/HS200/HS400 is working for them? I had this working in my U-Boot v2021.01 imx8mm-veice branch but it seems to not work in U-Boot master or v2021.07. I know there was a lot of back and forth on this... perhaps I missed something. I haven't been able to bisect yet as I had a lot of patches on top of my v2021.01 branch.
It looks to me like I was mistaken and we still don't have enough support upstream for IMX8MM UHS/HS200/HS400 to work.
The following are still needed: [1] fsl_esdhc_imx: Use esdhc_soc_data flags to set host caps - Adam submitted this some time ago which is required to set the IMX8MM MMC host capabilities such that UHS/HS200/HS400 are supported - it was never merged due to some uncertainty that everything was working with those modes. [2] mmc: fsl_esdhc_imx: use VENDORSPEC_FRC_SDCLK_ON to control card clock output - this was merged but later reverted [3] due to it causing a regression of extremely slow MMC in SPL/U-Boot on imx6qdl-pico for unknown reasons
That said, even though I had UHS/HS200/HS400/HS400ES support in my v2021.01 branch I ran into the following issues and ended up disabing HS200/HS400/HS400ES (but kept UHS enabled): - occasional failures with 'mmc init <emmcdev>' (nothing printed but an error code returned causing bootscripts to fail to boot to Linux - failures with eMMC parts that supported eMMC 5.1 HS400ES unless I disabled HS400ES (can't recall the exact failure and don't have a board handy to test with)
I'm going to kick off some testing to see if the above issues are still occuring with patch [1] and [2] on u-boot master.
Anyone else have some feedback regarding UHS/HS200/HS400/HS400ES on IMX8MM?
Best regards,
Tim [1] https://lists.denx.de/pipermail/u-boot/2020-December/436386.html [2] https://lists.denx.de/pipermail/u-boot/2021-March/443018.html [3] https://lists.denx.de/pipermail/u-boot/2021-June/451601.html