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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/drivers/mailbox/hi3660-mailbox.c
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@@ -38,6 +38,7 @@
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 #define MBOX_AUTOMATIC_ACK		1
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 #define MBOX_STATE_IDLE			BIT(4)
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+#define MBOX_STATE_READY		BIT(5)
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 #define MBOX_STATE_ACK			BIT(7)
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 #define MBOX_MSG_LEN			8
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@@ -91,8 +92,8 @@
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 	unsigned long val;
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 	unsigned int ret;
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-	/* Mailbox is idle so directly bail out */
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-	if (readl(base + MBOX_MODE_REG) & MBOX_STATE_IDLE)
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+	/* Mailbox is ready to use */
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+	if (readl(base + MBOX_MODE_REG) & MBOX_STATE_READY)
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 		return 0;
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 	/* Wait for acknowledge from remote */
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@@ -103,9 +104,9 @@
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 		return ret;
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 	}
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-	/* Ensure channel is released */
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-	writel(0xffffffff, base + MBOX_IMASK_REG);
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-	writel(BIT(mchan->ack_irq), base + MBOX_SRC_REG);
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+	/* clear ack state, mailbox will get back to ready state */
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+	writel(BIT(mchan->ack_irq), base + MBOX_ICLR_REG);
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+
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 	return 0;
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 }
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@@ -160,10 +161,6 @@
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 {
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 	int ret;
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-	ret = hi3660_mbox_check_state(chan);
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-	if (ret)
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-		return ret;
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-
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 	ret = hi3660_mbox_unlock(chan);
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 	if (ret)
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 		return ret;
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@@ -183,10 +180,11 @@
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 	void __iomem *base = MBOX_BASE(mbox, ch);
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 	u32 *buf = msg;
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 	unsigned int i;
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+	int ret;
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-	/* Ensure channel is released */
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-	writel_relaxed(0xffffffff, base + MBOX_IMASK_REG);
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-	writel_relaxed(BIT(mchan->ack_irq), base + MBOX_SRC_REG);
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+	ret = hi3660_mbox_check_state(chan);
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+	if (ret)
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+		return ret;
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 	/* Clear mask for destination interrupt */
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 	writel_relaxed(~BIT(mchan->dst_irq), base + MBOX_IMASK_REG);
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@@ -206,7 +204,7 @@
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 	return 0;
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 }
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-static struct mbox_chan_ops hi3660_mbox_ops = {
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+static const struct mbox_chan_ops hi3660_mbox_ops = {
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 	.startup	= hi3660_mbox_startup,
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 	.send_data	= hi3660_mbox_send_data,
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 };
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@@ -267,7 +265,7 @@
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 	for (ch = 0; ch < MBOX_CHAN_MAX; ch++)
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 		chan[ch].con_priv = (void *)ch;
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-	err = mbox_controller_register(&mbox->controller);
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+	err = devm_mbox_controller_register(dev, &mbox->controller);
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 	if (err) {
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 		dev_err(dev, "Failed to register mailbox %d\n", err);
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 		return err;
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@@ -278,17 +276,8 @@
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 	return 0;
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 }
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-static int hi3660_mbox_remove(struct platform_device *pdev)
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-{
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-	struct hi3660_mbox *mbox = platform_get_drvdata(pdev);
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-
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-	mbox_controller_unregister(&mbox->controller);
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-	return 0;
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-}
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-
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 static struct platform_driver hi3660_mbox_driver = {
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 	.probe  = hi3660_mbox_probe,
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-	.remove = hi3660_mbox_remove,
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 	.driver = {
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 		.name = "hi3660-mbox",
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 		.of_match_table = hi3660_mbox_of_match,