[RESEND, PATCH 4/5] soc: mediatek: mtk-cmdq: Add cmdq_pkt_acquire_event() function

From: Jason-JH . Lin
Date: Fri Mar 01 2024 - 09:44:56 EST


Add cmdq_pkt_acquire_event() function to support CMDQ user making
an instruction for acquiring event.

CMDQ users can use cmdq_pkt_acquire_event() and cmdq_pkt_clear_event()
to acquire GCE event and release GCE event and achieve the MUTEX_LOCK
protection between GCE threads.

Signed-off-by: Jason-JH.Lin <jason-jh.lin@xxxxxxxxxxxx>
---
drivers/soc/mediatek/mtk-cmdq-helper.c | 15 +++++++++++++++
include/linux/soc/mediatek/mtk-cmdq.h | 9 +++++++++
2 files changed, 24 insertions(+)

diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
index 2e9fc9bb1183..0183b40a0eff 100644
--- a/drivers/soc/mediatek/mtk-cmdq-helper.c
+++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
@@ -342,6 +342,21 @@ int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event, bool clear)
}
EXPORT_SYMBOL(cmdq_pkt_wfe);

+int cmdq_pkt_acquire_event(struct cmdq_pkt *pkt, u16 event)
+{
+ struct cmdq_instruction inst = {};
+
+ if (event >= CMDQ_MAX_EVENT)
+ return -EINVAL;
+
+ inst.op = CMDQ_CODE_WFE;
+ inst.value = CMDQ_WFE_UPDATE | CMDQ_WFE_UPDATE_VALUE | CMDQ_WFE_WAIT;
+ inst.event = event;
+
+ return cmdq_pkt_append_command(pkt, inst);
+}
+EXPORT_SYMBOL(cmdq_pkt_acquire_event);
+
int cmdq_pkt_clear_event(struct cmdq_pkt *pkt, u16 event)
{
struct cmdq_instruction inst = { {0} };
diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
index 2fe9be240fbc..de93c0a8e8a9 100644
--- a/include/linux/soc/mediatek/mtk-cmdq.h
+++ b/include/linux/soc/mediatek/mtk-cmdq.h
@@ -202,6 +202,15 @@ int cmdq_pkt_mem_move(struct cmdq_pkt *pkt, dma_addr_t src_addr, dma_addr_t dst_
*/
int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event, bool clear);

+/**
+ * cmdq_pkt_acquire_event() - append acquire event command to the CMDQ packet
+ * @pkt: the CMDQ packet
+ * @event: the desired event to be acquired
+ *
+ * Return: 0 for success; else the error code is returned
+ */
+int cmdq_pkt_acquire_event(struct cmdq_pkt *pkt, u16 event);
+
/**
* cmdq_pkt_clear_event() - append clear event command to the CMDQ packet
* @pkt: the CMDQ packet
--
2.18.0