On Tue, Mar 1, 2011 at 8:57 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > On Tue, 1 Mar 2011, Pierre Tardy wrote: > >> On Tue, Mar 1, 2011 at 8:33 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: >> > On Tue, 1 Mar 2011, Pierre Tardy wrote: >> > >> >> Please find sdhci runtime_pm implementation. >> >> >> >> It uses clock gating fw as a tip to know when our chip is idle. >> >> It implements wake up from card insertion/removal. >> >> >> >> This is RFC, please dont merge yet. I really would like to have deep review >> >> from PCI linux-pm guys. >> >> >> >> Opens are: >> >> >> >> 1/ Not sure if the pci configs in the driver in rpm_suspend/resume flow >> >> are not duplicate from what the core is doing. >> > >> > There may be one or two small errors. >> > >> >> 2/ Wakeup from D3hot: I cannot find any driver that is implementing it in current upstream, >> > >> > Other drivers do it, but they use PCI PME# instead of interrupts. >> Could you please elaborate? >> My understanding is that PCI PME will generate MSI, which translate in >> interrupt. > > It depends on the platform. On systems with ACPI, PCI PME generates an > ACPI I/O event, which is handled by the ACPI and PM cores. It does not > invoke the device driver's interrupt handler. So, let's say, in the ACPI case, if the interrupt handler dont get called, how would the driver know that he got a sdcard insert event, and trigger a mmc_rescan() ? Regards, Pierre _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
