Messages in this thread | | | Date | Thu, 16 Dec 2021 11:15:22 +0100 | Subject | Re: [PATCH 4/4] mmc: mmci: add hs200 support for stm32 sdmmc | From | Marek Vasut <> |
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On 12/16/21 10:44, Yann Gautier wrote: > On 12/16/21 10:14 AM, Marek Vasut wrote: >> On 12/15/21 15:17, Yann Gautier wrote: >>> Use feedback clock for HS200 mode, as for SDR104. >>> The HS200 mode can be enabled through DT by using mmc-hs200-1_8v. >>> It is possible to use it on STM32MP13, but not STM32MP15 platforms. >> >> HS200 is possible even on the MP15, it just doesn't yield any >> (performance) benefits due to the slower bus clock (125 MHz or so?), >> so it isn't worth enabling it on MP15. It is nice to see MP13 can do >> better. > > Hi Marek, > > There is a limitation on MP15, please see errata sheet [1], chapter 2.3.19. > HS200 (and SDR104) shouldn't be enabled on MP15. > > Best regards, > Yann > > [1] https://www.st.com/resource/en/errata_sheet/dm00516256.pdf
Oh, I see, so I was lucky to even ever get it working at all.
Thanks for the info.
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