On Fri 16 Oct 05:55 PDT 2015, Ulf Hansson wrote: > On 13 October 2015 at 03:00, Bjorn Andersson > <bjorn.andersson@xxxxxxxxxxxxxx> wrote: > > This allows us to specify expected current consumption of the vmmc and > > vqmmc regulators. This is needed to bring the supplying regulators out > > of their low-power-mode while accessing the mmc. > > This indeed makes sense, still I need to think a bit more on this. > Thanks. We can currently work around this by using "regulator-system-load" on the vmmc regulator, but a proper fix would be nice. > For example, can we allow these regulators to enter low power again at > some times? If so, when and what should that current value be. > The regulator framework recalculates the total load on a regulator upon enable/disable, but currently it doesn't depend on the state of the regulator. I talked to Mark about this a while back and he was positive to us correcting this, so disabled regulators wouldn't count towards the total load of a regulator. (So that still is on my todo) The second option would be to do what is done in the Qualcomm codeaurora kernels, where the regulators are never disabled and there's a smaller current specified for the suspend case. This would require bigger changes to the mmc core I presume, but the naming of the dt properties support such future adaption. > Moreover, wouldn't vmmc|vqmmc-active-current be depending what eMMC/SD > card that is attached? > I would say so, I do however not know how to acquire or encode that information. Any suggestions here are welcome. Regards, Bjorn -- 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
