On 14 December 2017 at 00:48, Zhoujie Wu <zjwu@xxxxxxxxxxx> wrote: > According to SD spec 3.00 3.6.1 signal voltage switch > procedure, host should wait 5ms after set 1.8V signal > enable bit in Host Control 2 register and check if 1.8V > is stable or not. > The core already deals with this. See mmc_set_uhs_voltage() and mmc_host_set_uhs_voltage(). We even have a retry mechanism in place. > On some cards, found without the delay would see "1.8V > regulator output did not became stable" err log. Seems like you need to fix the regulator instead. BTW, is this a regression? No? [...] Kind regards Uffe -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
