linux-kernel - [PATCH v7, 2/3] mailbox: mtk-cmdq: add gce ddr enable support flow

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Date:   Fri, 30 Sep 2022 17:59:14 +0800
From:   Yongqiang Niu <yongqiang.niu@...iatek.com>
To:     CK Hu <ck.hu@...iatek.com>, Chun-Kuang Hu <chunkuang.hu@...nel.org>
CC:     Jassi Brar <jassisinghbrar@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Yongqiang Niu <yongqiang.niu@...iatek.com>
Subject: [PATCH v7, 2/3] mailbox: mtk-cmdq: add gce ddr enable support flow

add gce ddr enable control flow when gce suspend/resume

Signed-off-by: Yongqiang Niu <yongqiang.niu@...iatek.com>
---
 drivers/mailbox/mtk-cmdq-mailbox.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c
index 04eb44d89119..84a60750d0c4 100644
--- a/drivers/mailbox/mtk-cmdq-mailbox.c
+++ b/drivers/mailbox/mtk-cmdq-mailbox.c
@@ -94,6 +94,21 @@ struct gce_plat {
 	u32 gce_num;
 };
 
+static void cmdq_sw_ddr_enable(struct cmdq *cmdq, bool enable)
+{
+	if (!cmdq->sw_ddr_en)
+		return;
+
+	WARN_ON(clk_bulk_enable(cmdq->gce_num, cmdq->clocks));
+
+	if (enable)
+		writel(GCE_DDR_EN | GCE_CTRL_BY_SW, cmdq->base + GCE_GCTL_VALUE);
+	else
+		writel(GCE_CTRL_BY_SW, cmdq->base + GCE_GCTL_VALUE);
+
+	clk_bulk_disable(cmdq->gce_num, cmdq->clocks);
+}
+
 u8 cmdq_get_shift_pa(struct mbox_chan *chan)
 {
 	struct cmdq *cmdq = container_of(chan->mbox, struct cmdq, mbox);
@@ -319,6 +334,8 @@ static int cmdq_suspend(struct device *dev)
 	if (task_running)
 		dev_warn(dev, "exist running task(s) in suspend\n");
 
+	cmdq_sw_ddr_enable(cmdq, false);
+
 	clk_bulk_unprepare(cmdq->gce_num, cmdq->clocks);
 
 	return 0;
@@ -330,6 +347,9 @@ static int cmdq_resume(struct device *dev)
 
 	WARN_ON(clk_bulk_prepare(cmdq->gce_num, cmdq->clocks));
 	cmdq->suspended = false;
+
+	cmdq_sw_ddr_enable(cmdq, true);
+
 	return 0;
 }
 
@@ -337,6 +357,8 @@ static int cmdq_remove(struct platform_device *pdev)
 {
 	struct cmdq *cmdq = platform_get_drvdata(pdev);
 
+	cmdq_sw_ddr_enable(cmdq, false);
+
 	clk_bulk_unprepare(cmdq->gce_num, cmdq->clocks);
 	return 0;
 }
-- 
2.25.1