linux-kernel - [PATCH v2] mailbox: mtk-cmdq: Refine GCE_GCTL

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Message-ID: <20250224105414.3576243-1-jason-jh.lin@mediatek.com>
Date: Mon, 24 Feb 2025 18:50:13 +0800
From: Jason-JH Lin <jason-jh.lin@...iatek.com>
To: Chun-Kuang Hu <chunkuang.hu@...nel.org>, AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>
CC: "Jason-JH . Lin" <jason-jh.lin@...iatek.com>, Nancy Lin
	<nancy.lin@...iatek.com>, Singo Chang <singo.chang@...iatek.com>, Yongqiang
 Niu <yongqiang.niu@...iatek.com>, Sirius Wang <sirius.wang@...iatek.com>,
	Xavier Chang <xavier.chang@...iatek.com>, Fei Shao <fshao@...omium.org>,
	Chen-yu Tsai <wenst@...omium.org>, Pin-yen Lin <treapking@...omium.org>,
	<dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
	<linux-mediatek@...ts.infradead.org>, <linux-arm-kernel@...ts.infradead.org>,
	<Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: [PATCH v2] mailbox: mtk-cmdq: Refine GCE_GCTL_VALUE setting

Add cmdq_gctl_value_toggle() to configure GCE_CTRL_BY_SW and GCE_DDR_EN
together in the same GCE_GCTL_VALUE register.

For the SoCs whose GCE is located in MMINFRA and uses MMINFRA_AO power,
this allows it to be written without enabling the clocks. Otherwise, all
GCE registers should be written after the GCE clocks are enabled.
Move this function into cmdq_runtime_resume() and cmdq_runtime_suspend()
to ensure it is called when the GCE clock is enabled.

Fixes: 7abd037aa581 ("mailbox: mtk-cmdq: add gce ddr enable support flow")
Signed-off-by: Jason-JH Lin <jason-jh.lin@...iatek.com>
---
 drivers/mailbox/mtk-cmdq-mailbox.c | 41 +++++++++++++-----------------
 1 file changed, 17 insertions(+), 24 deletions(-)

diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c
index d186865b8dce..a1841e4dc414 100644
--- a/drivers/mailbox/mtk-cmdq-mailbox.c
+++ b/drivers/mailbox/mtk-cmdq-mailbox.c
@@ -92,16 +92,17 @@ struct gce_plat {
 	u32 gce_num;
 };
 
-static void cmdq_sw_ddr_enable(struct cmdq *cmdq, bool enable)
+static void cmdq_gctl_value_toggle(struct cmdq *cmdq, bool ddr_enable)
 {
-	WARN_ON(clk_bulk_enable(cmdq->pdata->gce_num, cmdq->clocks));
+	u32 val = cmdq->pdata->control_by_sw ? GCE_CTRL_BY_SW : 0;
 
-	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);
+	if (!cmdq->pdata->control_by_sw && !cmdq->pdata->sw_ddr_en)
+		return;
 
-	clk_bulk_disable(cmdq->pdata->gce_num, cmdq->clocks);
+	if (cmdq->pdata->sw_ddr_en && ddr_enable)
+		val |= GCE_DDR_EN;
+
+	writel(val, cmdq->base + GCE_GCTL_VALUE);
 }
 
 u8 cmdq_get_shift_pa(struct mbox_chan *chan)
@@ -140,16 +141,10 @@ static void cmdq_thread_resume(struct cmdq_thread *thread)
 static void cmdq_init(struct cmdq *cmdq)
 {
 	int i;
-	u32 gctl_regval = 0;
 
 	WARN_ON(clk_bulk_enable(cmdq->pdata->gce_num, cmdq->clocks));
-	if (cmdq->pdata->control_by_sw)
-		gctl_regval = GCE_CTRL_BY_SW;
-	if (cmdq->pdata->sw_ddr_en)
-		gctl_regval |= GCE_DDR_EN;
 
-	if (gctl_regval)
-		writel(gctl_regval, cmdq->base + GCE_GCTL_VALUE);
+	cmdq_gctl_value_toggle(cmdq, true);
 
 	writel(CMDQ_THR_ACTIVE_SLOT_CYCLES, cmdq->base + CMDQ_THR_SLOT_CYCLES);
 	for (i = 0; i <= CMDQ_MAX_EVENT; i++)
@@ -315,14 +310,21 @@ static irqreturn_t cmdq_irq_handler(int irq, void *dev)
 static int cmdq_runtime_resume(struct device *dev)
 {
 	struct cmdq *cmdq = dev_get_drvdata(dev);
+	int ret;
 
-	return clk_bulk_enable(cmdq->pdata->gce_num, cmdq->clocks);
+	ret = clk_bulk_enable(cmdq->pdata->gce_num, cmdq->clocks);
+	if (ret)
+		return ret;
+
+	cmdq_gctl_value_toggle(cmdq, true);
+	return 0;
 }
 
 static int cmdq_runtime_suspend(struct device *dev)
 {
 	struct cmdq *cmdq = dev_get_drvdata(dev);
 
+	cmdq_gctl_value_toggle(cmdq, false);
 	clk_bulk_disable(cmdq->pdata->gce_num, cmdq->clocks);
 	return 0;
 }
@@ -347,9 +349,6 @@ static int cmdq_suspend(struct device *dev)
 	if (task_running)
 		dev_warn(dev, "exist running task(s) in suspend\n");
 
-	if (cmdq->pdata->sw_ddr_en)
-		cmdq_sw_ddr_enable(cmdq, false);
-
 	return pm_runtime_force_suspend(dev);
 }
 
@@ -360,9 +359,6 @@ static int cmdq_resume(struct device *dev)
 	WARN_ON(pm_runtime_force_resume(dev));
 	cmdq->suspended = false;
 
-	if (cmdq->pdata->sw_ddr_en)
-		cmdq_sw_ddr_enable(cmdq, true);
-
 	return 0;
 }
 
@@ -370,9 +366,6 @@ static void cmdq_remove(struct platform_device *pdev)
 {
 	struct cmdq *cmdq = platform_get_drvdata(pdev);
 
-	if (cmdq->pdata->sw_ddr_en)
-		cmdq_sw_ddr_enable(cmdq, false);
-
 	if (!IS_ENABLED(CONFIG_PM))
 		cmdq_runtime_suspend(&pdev->dev);
 
-- 
2.43.0