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It is essential to have a proper baseline for the > main changes in the series. > > Subsequent patches add proper completion reporting, clarify completion mode > selection, and fix subtle sequencing and interrupt issues to ensure > predictable, robust operation across ACPI-based PCC implementations. > > Specifically, the series: > > 1. Removes redundant shared buffer logic, reverting an earlier change that > duplicated existing mailbox core features and caused maintenance overhead. > > 2. Adds ->last_tx_done() support to allow polling clients to verify > transmission completion without relying on interrupts. > > 3. Explicitly configures completion modes (txdone_irq or txdone_poll) based > on ACPI PCCT doorbell capability flag, ensuring the correct completion > mechanism is chosen for each platform. > > 4. Marks transmit completion in the IRQ handler by invoking mbox_chan_txdone(), > preventing timeouts and ensuring proper synchronization for interrupt-driven > transfers. > > 5. Initializes the shared memory region (SHMEM) before binding clients, > preventing race conditions where clients could access uninitialized memory. > > 6. Clears any pending responder interrupts before enabling IRQs, avoiding > spurious or false interrupts during startup. > > Together, these updates make the PCC mailbox driver cleaner, more reliable, > and fully aligned with the mailbox framework's expectations, improving > determinism and robustness across different hardware platforms. > > Signed-off-by: Sudeep Holla > --- > Sudeep Holla (6): > Revert "mailbox/pcc: support mailbox management of the shared buffer" > mailbox: pcc: Wire up ->last_tx_done() for PCC channels > mailbox: pcc: Set txdone_irq/txdone_poll based on PCCT flags > mailbox: pcc: Mark Tx as complete in PCC IRQ handler > mailbox: pcc: Initialize SHMEM before binding the channel with the client > mailbox: pcc: Clear any pending responder interrupts before enabling it > > drivers/mailbox/pcc.c | 118 ++++++++++---------------------------------------- > include/acpi/pcc.h | 29 ------------- > 2 files changed, 23 insertions(+), 124 deletions(-) > --- > base-commit: 7ea30958b3054f5e488fa0b33c352723f7ab3a2a > change-id: 20251016-pcc_mb_updates-d9d428985400 > >