On Sat, 4 Feb 2012, Woodruff, Richard wrote: > When you have aggressive PM working at the SOC level you many times lost > a character on UART every since OMAP2. A strange but true statement is > it is nice to see it losing a character on mainline as it as in > indication that PM is likely working. We've been losing wakeup characters in mainline for many years now ;-) > One irritation was some internal interrupt sources were not linked to > low power wakeup events. If you were in interrupt mode and got > characters below watermark you could sleep before interrupt status > showed up (as you had to wait several frame times before functional > interrupt asserted) but there was no wake at anticipated frame timeout > because lack of linking of internal event to wake event. Indeed, it seems that we are just now working around these wakeup-related bugs. Kind of surprising that no errata showed up for them. What's particularly remarkable is that it looks like the UARTs will idle-ack while their transmit FIFOs have data in them (!) - Paul -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
