linux-kernel - [PATCH v2, 1/1] mailbox: cmdq: add instruction time-out interrupt support

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Date:   Thu, 30 Sep 2021 21:18:50 +0800
From:   Yongqiang Niu <yongqiang.niu@...iatek.com>
To:     Chun-Kuang Hu <chunkuang.hu@...nel.org>
CC:     Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "David Airlie" <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Yongqiang Niu <yongqiang.niu@...iatek.com>,
        Fabien Parent <fparent@...libre.com>,
        Dennis YC Hsieh <dennis-yc.hsieh@...iatek.com>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        Hsin-Yi Wang <hsinyi@...omium.org>
Subject: [PATCH v2, 1/1] mailbox: cmdq: add instruction time-out interrupt support

add time-out cycle setting to make sure time-out interrupt irq
will happened when instruction time-out for wait and poll

Signed-off-by: Yongqiang Niu <yongqiang.niu@...iatek.com>
---
 drivers/mailbox/mtk-cmdq-mailbox.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c
index 64175a893312..197b03222f94 100644
--- a/drivers/mailbox/mtk-cmdq-mailbox.c
+++ b/drivers/mailbox/mtk-cmdq-mailbox.c
@@ -36,6 +36,7 @@
 #define CMDQ_THR_END_ADDR		0x24
 #define CMDQ_THR_WAIT_TOKEN		0x30
 #define CMDQ_THR_PRIORITY		0x40
+#define CMDQ_THR_INSTN_TIMEOUT_CYCLES	0x50
 
 #define GCE_GCTL_VALUE			0x48
 
@@ -54,6 +55,15 @@
 #define CMDQ_JUMP_BY_OFFSET		0x10000000
 #define CMDQ_JUMP_BY_PA			0x10000001
 
+/*
+ * instruction time-out
+ * cycles to issue instruction time-out interrupt for wait and poll instructions
+ * GCE axi_clock 156MHz
+ * 1 cycle = 6.41ns
+ * instruction time out 2^22*2*6.41ns = 53ms
+ */
+#define CMDQ_INSTN_TIMEOUT_CYCLES	22
+
 struct cmdq_thread {
 	struct mbox_chan	*chan;
 	void __iomem		*base;
@@ -376,6 +386,7 @@ static int cmdq_mbox_send_data(struct mbox_chan *chan, void *data)
 		writel((task->pa_base + pkt->cmd_buf_size) >> cmdq->shift_pa,
 		       thread->base + CMDQ_THR_END_ADDR);
 
+		writel(CMDQ_INSTN_TIMEOUT_CYCLES, thread->base + CMDQ_THR_INSTN_TIMEOUT_CYCLES);
 		writel(thread->priority, thread->base + CMDQ_THR_PRIORITY);
 		writel(CMDQ_THR_IRQ_EN, thread->base + CMDQ_THR_IRQ_ENABLE);
 		writel(CMDQ_THR_ENABLED, thread->base + CMDQ_THR_ENABLE_TASK);
-- 
2.25.1