On Thu, Dec 03, 2020 at 02:51:24PM -0800, Raj, Ashok wrote: > - Press ATTN, > - Slot is empty > - After 5 seconds synthetic PDC arrives. > but since no presence and no link active, we leave slot in > BLINKINGON_STATE, and led keeps blinking > > if someone were to add a card after the 5 seconds, no hot-add is processed > since we don't get notifications for PDC events when ATTN exists. > > Can we automatically cancel the blinking and return slot back to OFF_STATE? Yes. > If the operation initiated by the attention button fails for any reason, it > is recommended that system software present an error message explaining > failure via a software user interface, or add the error message to system > log. Ah so we're supposed to log a message if the slot is empty. That needs to be added then to the code snippet I sent you yesterday in response to your off-list e-mail. > Alternately we can also choose to subscribe to PDC, but ignore if slot is > in OFF_STATE. So we let ATTN drive the add. But if PDC happens and we are > in BLINKINGON_STATE, then we can process the hot-add? Spec says a software > recommendation, but i think the cancel after 5 seconds seems better? That approach seems more complicated. It's better to stop blinking and return to OFF_STATE if after the 5 second interval the slot is found to be empty. Thanks, Lukas
