[PATCH v2 12/14] soc: mediatek: cmdq: add loop function

Dennis YC Hsieh
2019-11-27T02:00:39Z

Add finalize loop function in cmdq helper functions which loop whole pkt
in gce hardware thread without cpu operation.

Signed-off-by: Dennis YC Hsieh <dennis-yc.hsieh@mediatek.com>
---
drivers/soc/mediatek/mtk-cmdq-helper.c | 22 ++++++++++++++++++++++
include/linux/soc/mediatek/mtk-cmdq.h | 8 ++++++++
2 files changed, 30 insertions(+)

diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
index 38e0c13e1922..10a9b4481e58 100644
--- a/drivers/soc/mediatek/mtk-cmdq-helper.c
+++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
@@ -414,6 +414,28 @@ int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
}
EXPORT_SYMBOL(cmdq_pkt_finalize);

+int cmdq_pkt_finalize_loop(struct cmdq_pkt *pkt)
+{
+ struct cmdq_client *cl = pkt->cl;
+ struct cmdq_instruction inst = { {0} };
+ int err;
+
+ /* insert EOC and generate IRQ for each command iteration */
+ inst.op = CMDQ_CODE_EOC;
+ err = cmdq_pkt_append_command(pkt, inst);
+ if (err < 0)
+ return err;
+
+ /* JUMP abaolute to begin */
+ inst.op = CMDQ_CODE_JUMP;
+ inst.offset = 1;
+ inst.value = pkt->pa_base >> cmdq_mbox_shift(cl->chan);
+ err = cmdq_pkt_append_command(pkt, inst);
+
+ return err;
+}
+EXPORT_SYMBOL(cmdq_pkt_finalize_loop);
+
static void cmdq_pkt_flush_async_cb(struct cmdq_cb_data data)
{
struct cmdq_pkt *pkt = (struct cmdq_pkt *)data.data;
diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
index 998bc90f9da9..d15d8c941992 100644
--- a/include/linux/soc/mediatek/mtk-cmdq.h
+++ b/include/linux/soc/mediatek/mtk-cmdq.h
@@ -212,6 +212,14 @@ int cmdq_pkt_assign(struct cmdq_pkt *pkt, u16 reg_idx, u32 value);
*/
int cmdq_pkt_finalize(struct cmdq_pkt *pkt);

+/**
+ * cmdq_pkt_finalize_loop() - Append EOC and jump command to loop pkt.
+ * @pkt: the CMDQ packet
+ *
+ * Return: 0 for success; else the error code is returned
+ */
+int cmdq_pkt_finalize_loop(struct cmdq_pkt *pkt);
+
/**
* cmdq_pkt_flush_async() - trigger CMDQ to asynchronously execute the CMDQ
* packet and call back at the end of done packet
--
2.18.0