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Message-Id: <20191026192359.27687-1-frank-w@public-files.de>
Date:   Sat, 26 Oct 2019 21:23:59 +0200
From:   Frank Wunderlich <frank-w@...lic-files.de>
To:     linux-mediatek@...ts.infradead.org
Cc:     Frank Wunderlich <frank-w@...lic-files.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-serial@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: 

Date: Sat, 26 Oct 2019 20:53:28 +0200
Subject: [PATCH] serial: 8250-mtk: Ask for IRQ-count before request one

at least on bananapi-r2 we have only 1 IRQ and need to
check for IRQ-count to fix following Errors during probe:

[    4.935780] mt6577-uart 11004000.serial: IRQ index 1 not found
[    4.962589] 11002000.serial: ttyS1 at MMIO 0x11002000 (irq = 202, base_baud = 1625000) is a ST16650V2
[    4.972127] mt6577-uart 11002000.serial: IRQ index 1 not found
[    4.998927] 11003000.serial: ttyS2 at MMIO 0x11003000 (irq = 203, base_baud = 1625000) is a ST16650V2
[    5.008474] mt6577-uart 11003000.serial: IRQ index 1 not found

based on Patch from Anson Huang
https://patchwork.ozlabs.org/patch/1164500/

Signed-off-by: Frank Wunderlich <frank-w@...lic-files.de>
---
 drivers/tty/serial/8250/8250_mtk.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c
index b411ba4eb5e9..bf250187928a 100644
--- a/drivers/tty/serial/8250/8250_mtk.c
+++ b/drivers/tty/serial/8250/8250_mtk.c
@@ -485,6 +485,7 @@ static int mtk8250_probe(struct platform_device *pdev)
 	struct resource *regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	struct resource *irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 	struct mtk8250_data *data;
+	int irq_count;
 	int err;
 
 	if (!regs || !irq) {
@@ -544,7 +545,15 @@ static int mtk8250_probe(struct platform_device *pdev)
 	pm_runtime_set_active(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
 
-	data->rx_wakeup_irq = platform_get_irq(pdev, 1);
+	irq_count = platform_irq_count(pdev);
+	if (irq_count < 0)
+		return irq_count;
+
+	if (irq_count > 1) {
+		data->rx_wakeup_irq = platform_get_irq(pdev, 1);
+		if (data->rx_wakeup_irq < 0)
+			data->rx_wakeup_irq = 0;
+	}
 
 	return 0;
 }
-- 
2.17.1