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Subject[PATCH 03/15] soc: mediatek: Support GCE thread loop
Date
Add a new API to create GCE thread loop by
appending a command at the end of CMDQ packet
to jump to the head of it.

Signed-off-by: Hsiao Chien Sung <shawn.sung@mediatek.com>
---
drivers/soc/mediatek/mtk-cmdq-helper.c | 30 ++++++++++++++++++++++++++
include/linux/soc/mediatek/mtk-cmdq.h | 2 ++
2 files changed, 32 insertions(+)

diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
index c1837a468267..7d503d491c0d 100644
--- a/drivers/soc/mediatek/mtk-cmdq-helper.c
+++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
@@ -430,6 +430,9 @@ int cmdq_pkt_flush_async(struct cmdq_pkt *pkt)
int err;
struct cmdq_client *client = (struct cmdq_client *)pkt->cl;

+ dma_sync_single_for_device(client->chan->mbox->dev, pkt->pa_base,
+ pkt->cmd_buf_size, DMA_TO_DEVICE);
+
err = mbox_send_message(client->chan, pkt);
if (err < 0)
return err;
@@ -440,4 +443,31 @@ int cmdq_pkt_flush_async(struct cmdq_pkt *pkt)
}
EXPORT_SYMBOL(cmdq_pkt_flush_async);

+int cmdq_pkt_finalize_loop(struct cmdq_pkt *pkt)
+{
+ struct cmdq_instruction inst = { {0} };
+ int err;
+ u8 shift_pa = 0;
+
+ shift_pa = cmdq_get_shift_pa(((struct cmdq_client *)pkt->cl)->chan);
+
+ /* insert EOC and generate IRQ for command iteration */
+ inst.op = CMDQ_CODE_EOC;
+ inst.value = CMDQ_EOC_IRQ_EN;
+ err = cmdq_pkt_append_command(pkt, inst);
+ if (err < 0)
+ return err;
+
+ /* jump to head of the packet */
+ inst.op = CMDQ_CODE_JUMP;
+ inst.offset = CMDQ_JUMP_RELATIVE;
+ inst.value = pkt->pa_base >> shift_pa;
+ err = cmdq_pkt_append_command(pkt, inst);
+
+ pkt->loop = true;
+
+ return err;
+}
+EXPORT_SYMBOL(cmdq_pkt_finalize_loop);
+
MODULE_LICENSE("GPL v2");
diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
index 3eb95ef34c6c..4c30f891d924 100644
--- a/include/linux/soc/mediatek/mtk-cmdq.h
+++ b/include/linux/soc/mediatek/mtk-cmdq.h
@@ -273,6 +273,8 @@ int cmdq_pkt_jump(struct cmdq_pkt *pkt, dma_addr_t addr);
*/
int cmdq_pkt_finalize(struct cmdq_pkt *pkt);

+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
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