linux-kernel - [PATCH v2 02/11] soc: mediatek: Support GCE jump to absolute

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Message-ID: <20230918084207.23604-3-shawn.sung@mediatek.com>
Date:   Mon, 18 Sep 2023 16:41:58 +0800
From:   Hsiao Chien Sung <shawn.sung@...iatek.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     Daniel Vetter <daniel@...ll.ch>, David Airlie <airlied@...il.com>,
        "Philipp Zabel" <p.zabel@...gutronix.de>,
        Chen-Yu Tsai <wenst@...omium.org>, CK Hu <ck.hu@...iatek.com>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Hsiao Chien Sung <shawn.sung@...iatek.com>
Subject: [PATCH v2 02/11] soc: mediatek: Support GCE jump to absolute

Add a new API to jump to the head of cmdq packet by
appending a jump command at the end of it.

Signed-off-by: Hsiao Chien Sung <shawn.sung@...iatek.com>
---
 drivers/soc/mediatek/mtk-cmdq-helper.c | 16 ++++++++++++++++
 include/linux/soc/mediatek/mtk-cmdq.h  |  2 ++
 2 files changed, 18 insertions(+)

diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
index b0cd071c4719..e029ce231df1 100644
--- a/drivers/soc/mediatek/mtk-cmdq-helper.c
+++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
@@ -441,4 +441,20 @@ int cmdq_pkt_flush_async(struct cmdq_pkt *pkt)
 }
 EXPORT_SYMBOL(cmdq_pkt_flush_async);
 
+int cmdq_pkt_jump_absolute(struct cmdq_pkt *pkt)
+{
+	struct cmdq_instruction inst = { 0 };
+	u8 shift_pa;
+
+	shift_pa = cmdq_get_shift_pa(((struct cmdq_client *)pkt->cl)->chan);
+
+	/* jump to head of the packet */
+	inst.op = CMDQ_CODE_JUMP;
+	inst.offset = CMDQ_JUMP_RELATIVE;
+	inst.value = pkt->pa_base >> shift_pa;
+
+	return cmdq_pkt_append_command(pkt, inst);
+}
+EXPORT_SYMBOL(cmdq_pkt_jump_absolute);
+
 MODULE_LICENSE("GPL v2");
diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
index a253c001c861..106988cc5f01 100644
--- a/include/linux/soc/mediatek/mtk-cmdq.h
+++ b/include/linux/soc/mediatek/mtk-cmdq.h
@@ -276,6 +276,8 @@ int cmdq_pkt_jump(struct cmdq_pkt *pkt, dma_addr_t addr);
  */
 int cmdq_pkt_finalize(struct cmdq_pkt *pkt);
 
+int cmdq_pkt_jump_absolute(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