On Wed, 25 Jul 2018 09:58:37 +0300
Mikko Perttunen [off-list ref] wrote:

Looks like patch 6 will probably cause tegra-sdhci to start advertising 
faster modes (see " if (!IS_ERR(host->mmc->supply.vqmmc))" in 
sdhci-tegra.c). With that patch and this, will the SDHCI core start to 
try putting us into these higher modes? Clearly that won't work yet 
before the upcoming patches.

The SDHCI core won't do that yet at this point. The host capability bits
for the higher speed modes are currently masked by tegra_sdhci_reset()
in sdhci-tegra. The modes are unmasked in another patch after everything
that's required to support the modes has been implemented.

 -Aapo