linux-kernel - [PATCH v7 03/20] mailbox: mtk-cmdq: Add cmdq private data to cmdq

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Message-ID: <20250827114006.3310175-4-jason-jh.lin@mediatek.com>
Date: Wed, 27 Aug 2025 19:37:35 +0800
From: Jason-JH Lin <jason-jh.lin@...iatek.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Jassi Brar <jassisinghbrar@...il.com>,
	Chun-Kuang Hu <chunkuang.hu@...nel.org>, AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>, Mauro Carvalho Chehab
	<mchehab@...nel.org>
CC: Matthias Brugger <matthias.bgg@...il.com>, Nicolas Dufresne
	<nicolas@...fresne.ca>, Jason-JH Lin <jason-jh.lin@...iatek.com>, Nancy Lin
	<nancy.lin@...iatek.com>, Singo Chang <singo.chang@...iatek.com>, Paul-PL
 Chen <paul-pl.chen@...iatek.com>, Moudy Ho <moudy.ho@...iatek.com>, Xiandong
 Wang <xiandong.wang@...iatek.com>, Sirius Wang <sirius.wang@...iatek.com>,
	Fei Shao <fshao@...omium.org>, Chen-yu Tsai <wenst@...omium.org>,
	<Project_Global_Chrome_Upstream_Group@...iatek.com>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<dri-devel@...ts.freedesktop.org>, <linux-mediatek@...ts.infradead.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-media@...r.kernel.org>
Subject: [PATCH v7 03/20] mailbox: mtk-cmdq: Add cmdq private data to cmdq_pkt for generating instruction

Add the cmdq_mbox_priv structure to store the private data of GCE,
such as the shift bits of the physical address. Then, include the
cmdq_mbox_priv structure within the cmdq_pkt structure.

This allows CMDQ users to utilize the private data in cmdq_pkt to
generate GCE instructions when needed. Additionally, having
cmdq_mbox_priv makes it easier to expand and reference other GCE
private data in the future.

Add cmdq_get_mbox_priv() for CMDQ users to get all the private data
into the cmdq_mbox_priv of the cmdq_pkt.

Fixes: 0858fde496f8 ("mailbox: cmdq: variablize address shift in platform")
Signed-off-by: Jason-JH Lin <jason-jh.lin@...iatek.com>
---
 drivers/mailbox/mtk-cmdq-mailbox.c       |  8 ++++++++
 include/linux/mailbox/mtk-cmdq-mailbox.h | 18 ++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c
index a60486cbb533..6b6b0abe9c36 100644
--- a/drivers/mailbox/mtk-cmdq-mailbox.c
+++ b/drivers/mailbox/mtk-cmdq-mailbox.c
@@ -102,6 +102,14 @@ static inline dma_addr_t cmdq_reg_revert_addr(u32 addr, const struct gce_plat *p
 	return ((dma_addr_t)addr << pdata->shift);
 }
 
+void cmdq_get_mbox_priv(struct mbox_chan *chan, struct cmdq_mbox_priv *priv)
+{
+	struct cmdq *cmdq = container_of(chan->mbox, struct cmdq, mbox);
+
+	priv->shift_pa = cmdq->pdata->shift;
+}
+EXPORT_SYMBOL(cmdq_get_mbox_priv);
+
 u8 cmdq_get_shift_pa(struct mbox_chan *chan)
 {
 	struct cmdq *cmdq = container_of(chan->mbox, struct cmdq, mbox);
diff --git a/include/linux/mailbox/mtk-cmdq-mailbox.h b/include/linux/mailbox/mtk-cmdq-mailbox.h
index e1555e06e7e5..73b70be4a8a7 100644
--- a/include/linux/mailbox/mtk-cmdq-mailbox.h
+++ b/include/linux/mailbox/mtk-cmdq-mailbox.h
@@ -70,13 +70,31 @@ struct cmdq_cb_data {
 	struct cmdq_pkt		*pkt;
 };
 
+struct cmdq_mbox_priv {
+	u8 shift_pa;
+};
+
 struct cmdq_pkt {
 	void			*va_base;
 	dma_addr_t		pa_base;
 	size_t			cmd_buf_size; /* command occupied size */
 	size_t			buf_size; /* real buffer size */
+	struct cmdq_mbox_priv	priv; /* for generating instruction */
 };
 
+/**
+ * cmdq_get_mbox_priv() - get the private data of mailbox channel
+ * @chan: mailbox channel
+ * @priv: pointer to store the private data of mailbox channel
+ *
+ * While generating the GCE instruction to command buffer, the private data
+ * of GCE hardware may need to be referenced, such as the shift bits of
+ * physical address.
+ *
+ * This function should be called before generating the GCE instruction.
+ */
+void cmdq_get_mbox_priv(struct mbox_chan *chan, struct cmdq_mbox_priv *priv);
+
 /**
  * cmdq_get_shift_pa() - get the shift bits of physical address
  * @chan: mailbox channel
-- 
2.43.0