On Thu, Mar 12, 2026 at 02:46:27PM +0530, Moteen Shah wrote: > Hey Tom and Udit, > > On 10/03/26 04:45, Tom Rini wrote: > > On Fri, Feb 20, 2026 at 03:17:37PM +0530, Moteen Shah wrote: > > > On 20/02/26 14:05, Kumar, Udit wrote: > > > > On 2/20/2026 12:55 PM, Moteen Shah wrote: > > > > > Add config to allow UHS support, in turn allowing to select > > > > > UHS speed modes for the SD card > > > > > > > > > > Signed-off-by: Moteen Shah <[email protected]> > > > > > --- > > > > > Test logs: > > > > > https://gist.github.com/Jamm02/e8b8b8c95cb62a7145d73f7ef50b2d8e > > > > > > > > > > configs/j722s_evm_a53_defconfig | 1 + > > > > > 1 file changed, 1 insertion(+) > > > > > > > > > > diff --git a/configs/j722s_evm_a53_defconfig > > > > > b/configs/j722s_evm_a53_defconfig > > > > > index e84670c75ed..24ee293c803 100644 > > > > > --- a/configs/j722s_evm_a53_defconfig > > > > > +++ b/configs/j722s_evm_a53_defconfig > > > > > @@ -107,6 +107,7 @@ CONFIG_MMC_SDHCI=y > > > > > CONFIG_MMC_SDHCI_ADMA=y > > > > > CONFIG_SPL_MMC_SDHCI_ADMA=y > > > > > CONFIG_MMC_SDHCI_AM654=y > > > > > +CONFIG_MMC_UHS_SUPPORT=y > > > > > > > > you may need at A72/SPL stage as well, > > > Other J7 boards already have this config enabled in the a72 stage. > > > > and do you think , R5/SPL will need this too ? > > > Any of the K3 devices does not enables this in R5 SPL, though we do have > > > HS400 enabled in the R5 stage. > > > Adding the config should result in a little performance gain I think. > > Is this a function of board design, or a SoC-level feature? > > SOC level feature, thought it has dependency on the board to provide the > right voltage to the card. > > @udit, I did some profiling with UHS enabled at the R5 stage on J784s4-EVM > but I see no performance gain there, likely due to the fact that the R5 > stage takes up very minimal percentage of the boot time. This patch can go > in as it is.
I think we should imply this under ARCH_K3 then, so that boards which do not meet the design requirements can turn it off, as I am assuming most do. -- Tom
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