linux-kernel - [PATCH 3/3] uart: mediatek: move the in-band wakeup logic to core

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Message-Id: <20200506072314.112409-4-tientzu@chromium.org>
Date:   Wed,  6 May 2020 15:23:14 +0800
From:   Claire Chang <tientzu@...omium.org>
To:     robh@...nel.org, gregkh@...uxfoundation.org, jslaby@...e.com,
        long.cheng@...iatek.com, changqi.hu@...iatek.com
Cc:     linux-serial@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Claire Chang <tientzu@...omium.org>
Subject: [PATCH 3/3] uart: mediatek: move the in-band wakeup logic to core

Move the in-band wakeup logic to core so that we can control the wakeup
behavior by serdev controller's power/wakeup node and align with other
serial drivers.

Signed-off-by: Claire Chang <tientzu@...omium.org>
---
 drivers/tty/serial/8250/8250_mtk.c | 24 +++---------------------
 1 file changed, 3 insertions(+), 21 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c
index f839380c2f4c1..52cb41e4e493d 100644
--- a/drivers/tty/serial/8250/8250_mtk.c
+++ b/drivers/tty/serial/8250/8250_mtk.c
@@ -71,7 +71,6 @@ struct mtk8250_data {
 #ifdef CONFIG_SERIAL_8250_DMA
 	enum dma_rx_status	rx_status;
 #endif
-	int			rx_wakeup_irq;
 };
 
 /* flow control mode */
@@ -496,6 +495,8 @@ static int mtk8250_probe(struct platform_device *pdev)
 	struct uart_8250_port uart = {};
 	struct resource *regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	struct resource *irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	struct resource *wakeup_irq =
+		platform_get_resource(pdev, IORESOURCE_IRQ, 1);
 	struct mtk8250_data *data;
 	int err;
 
@@ -525,6 +526,7 @@ static int mtk8250_probe(struct platform_device *pdev)
 	spin_lock_init(&uart.port.lock);
 	uart.port.mapbase = regs->start;
 	uart.port.irq = irq->start;
+	uart.port.wakeup_irq = wakeup_irq ? wakeup_irq->start : -ENXIO;
 	uart.port.pm = mtk8250_do_pm;
 	uart.port.type = PORT_16550;
 	uart.port.flags = UPF_BOOT_AUTOCONF | UPF_FIXED_PORT;
@@ -556,8 +558,6 @@ static int mtk8250_probe(struct platform_device *pdev)
 	if (data->line < 0)
 		return data->line;
 
-	data->rx_wakeup_irq = platform_get_irq_optional(pdev, 1);
-
 	return 0;
 }
 
@@ -581,23 +581,9 @@ static int mtk8250_remove(struct platform_device *pdev)
 static int __maybe_unused mtk8250_suspend(struct device *dev)
 {
 	struct mtk8250_data *data = dev_get_drvdata(dev);
-	int irq = data->rx_wakeup_irq;
-	int err;
 
 	serial8250_suspend_port(data->line);
-
 	pinctrl_pm_select_sleep_state(dev);
-	if (irq >= 0) {
-		err = enable_irq_wake(irq);
-		if (err) {
-			dev_err(dev,
-				"failed to enable irq wake on IRQ %d: %d\n",
-				irq, err);
-			pinctrl_pm_select_default_state(dev);
-			serial8250_resume_port(data->line);
-			return err;
-		}
-	}
 
 	return 0;
 }
@@ -605,12 +591,8 @@ static int __maybe_unused mtk8250_suspend(struct device *dev)
 static int __maybe_unused mtk8250_resume(struct device *dev)
 {
 	struct mtk8250_data *data = dev_get_drvdata(dev);
-	int irq = data->rx_wakeup_irq;
 
-	if (irq >= 0)
-		disable_irq_wake(irq);
 	pinctrl_pm_select_default_state(dev);
-
 	serial8250_resume_port(data->line);
 
 	return 0;
-- 
2.26.2.526.g744177e7f7-goog