On Wednesday, August 03, 2016 04:01:09 PM Lv Zheng wrote: > There is a known issue in the EC driver. > > 1. During the suspend/resume process, the EC driver is required to work > even in the noirq stage. And currently the event handling is > disabled/enabled in the noirq stage. > 2. Unfortunately, the EC driver only implements the polling mode for > handling the transactions, and is not prepared to handle events in the > polling mode. > The result of the above conflict is: if an SCI_EVT is indicated during the > noirq stage (especially after resuming), the EC driver is not able to > detect the SCI_EVT unless: > 1. GPE STS not cleared: When the GPE is enabled, advance_transaction() will > be invoked to poll SCI_EVT. > 2. EC transaction occurred: When an EC transaction ocurred, > advance_transaction() will be invoked in the > polling mode. > If an SCI_EVT ocurred during noirq stage and the above 2 triggering sources > cannot handle it, then a problem could be seen by the users: > If SCI_EVT is left set after resuming and there is still no EC > transactions, this event cannot be handled. > > This patchset tries to disable/enable the event handling out of the noirq > stage to fix this issue. > > Though it is always correct to enable the event handling in a later stage > during resuming as long as the event won't be lost, it may not be correct > to disable the event handling in an earlier stage during suspending. This > patchset thus put a boot parameter for the suspending part tuning in order > to be able to respond to the possible regressions. > > Since the event handling is disabled for a longer period during > suspend/resume, this patchset can also tune the suspend/resume speed > faster. > > Lv Zheng (5): > ACPI / EC: Add EC_FLAGS_QUERY_ENABLED to reveal a hidden logic > ACPI / EC: Fix an issue that SCI_EVT cannot be detected after event > is enabled > ACPI / EC: Add PM operations to improve event handling for resume > process > ACPI / EC: Add PM operations to improve event handling for suspend > process > ACPI / EC: Enable event freeze mode to improve event handling > efficiency for suspend process Wholes series applied. Thanks, Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
