[PATCH v3 5/9] mailbox: mtk-cmdq: Support GCE loop packets in interrupt handler

Jason-JH.Lin
2023-12-22T04:53:29Z

1. Add a loop flag for CMDQ packet struct.
CMDQ helper will use a loop flag to mark CMDQ packet as lopping command
and make current command buffer jumps to the beginning when GCE executes
to the end of command buffer.

2. Add a looping task handle flow in irq handler.
GCE irq occurs when GCE executes to the end of command(EOC) instruction.
If the CMDQ packet is a loopping command, GCE irq handler can not
delete the CMDQ task and disable the GCE thread.

Signed-off-by: Jason-JH.Lin <jason-jh.lin@mediatek.com>
---
drivers/mailbox/mtk-cmdq-mailbox.c | 11 +++++++++++
include/linux/mailbox/mtk-cmdq-mailbox.h | 1 +
2 files changed, 12 insertions(+)

diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c
index 27ff3a3ccf2f..5390b6488ebc 100644
--- a/drivers/mailbox/mtk-cmdq-mailbox.c
+++ b/drivers/mailbox/mtk-cmdq-mailbox.c
@@ -267,6 +267,17 @@ static void cmdq_thread_irq_handler(struct cmdq *cmdq,

curr_pa = readl(thread->base + CMDQ_THR_CURR_ADDR) << cmdq->pdata->shift;

+ task = list_first_entry_or_null(&thread->task_busy_list,
+ struct cmdq_task, list_entry);
+ if (task && task->pkt->loop) {
+ struct cmdq_cb_data data;
+
+ data.sta = err;
+ data.pkt = task->pkt;
+ mbox_chan_received_data(task->thread->chan, &data);
+ return;
+ }
+
list_for_each_entry_safe(task, tmp, &thread->task_busy_list,
list_entry) {
task_end_pa = task->pa_base + task->pkt->cmd_buf_size;
diff --git a/include/linux/mailbox/mtk-cmdq-mailbox.h b/include/linux/mailbox/mtk-cmdq-mailbox.h
index a8f0070c7aa9..f78a08e7c6ed 100644
--- a/include/linux/mailbox/mtk-cmdq-mailbox.h
+++ b/include/linux/mailbox/mtk-cmdq-mailbox.h
@@ -76,6 +76,7 @@ struct cmdq_pkt {
size_t cmd_buf_size; /* command occupied size */
size_t buf_size; /* real buffer size */
void *cl;
+ bool loop;
};

u8 cmdq_get_shift_pa(struct mbox_chan *chan);
--
2.18.0