linux-kernel - tty/8250: Deactivate the HSUART DMA for the DNV CPU

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Message-Id: <20250625031409.2404219-1-opensource@ruijie.com.cn>
Date: Tue, 24 Jun 2025 22:14:09 -0500
From: micas-opensource <zjianan156@...il.com>
To: andy@...nel.org,
	gregkh@...uxfoundation.org,
	jirislaby@...nel.org
Cc: linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org,
	Philo Shao <philo@...asnetworks.com>
Subject: tty/8250: Deactivate the HSUART DMA for the DNV CPU

From: Philo Shao <philo@...asnetworks.com>

Intel DNV CPU reports an error, indicating that there is a possibility of abnormal serial port functionality and the CPU may hang. 
The HSUART DMA will be deactivated for the DNV CPU.

Signed-off-by: Philo Shao<philo@...asnetworks.com>
---
 drivers/tty/serial/8250/8250_mid.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_mid.c b/drivers/tty/serial/8250/8250_mid.c
index 2cc78a4bf..e4a5d6358 100644
--- a/drivers/tty/serial/8250/8250_mid.c
+++ b/drivers/tty/serial/8250/8250_mid.c
@@ -321,13 +321,17 @@ static int mid8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	if (!uart.port.membase)
 		return -ENOMEM;
 
-	ret = mid->board->setup(mid, &uart.port);
-	if (ret)
-		return ret;
-
-	ret = mid8250_dma_setup(mid, &uart);
-	if (ret)
-		goto err;
+	if (id->device != PCI_DEVICE_ID_INTEL_DNV_UART) {
+		ret = mid->board->setup(mid, &uart.port);
+		if (ret)
+			return ret;
+
+		ret = mid8250_dma_setup(mid, &uart);
+		if (ret)
+			goto err;
+	} else {
+		uart.port.handle_irq = dnv_handle_irq;
+	}
 
 	ret = serial8250_register_8250_port(&uart);
 	if (ret < 0)
-- 
2.25.1