linux-kernel - [PATCH] rtl8xxxu: disable interrupt_in transfer for 8188cu and 8192cu

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Message-Id: <20210701163354.118403-1-chris.chiu@canonical.com>
Date:   Fri,  2 Jul 2021 00:33:54 +0800
From:   chris.chiu@...onical.com
To:     Jes.Sorensen@...il.com, kvalo@...eaurora.org, davem@...emloft.net,
        kuba@...nel.org, code@...o-schneider.ch
Cc:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Chris Chiu <chris.chiu@...onical.com>
Subject: [PATCH] rtl8xxxu: disable interrupt_in transfer for 8188cu and 8192cu

From: Chris Chiu <chris.chiu@...onical.com>

There will be crazy numbers of interrupts triggered by 8188cu and
8192cu module, around 8000~10000 interrupts per second, on the usb
host controller. Compare with the vendor driver source code, it's
mapping to the configuration CONFIG_USB_INTERRUPT_IN_PIPE and it is
disabled by default.

Since the interrupt transfer is neither used for TX/RX nor H2C
commands. Disable it to avoid the confusing interrupts for the
8188cu and 8192cu module which I only have for verification.

Signed-off-by: Chris Chiu <chris.chiu@...onical.com>
---
 drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
index 03c6ed7efe06..6a3dfa71b27f 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
@@ -1670,7 +1670,7 @@ static int rtl8xxxu_identify_chip(struct rtl8xxxu_priv *priv)
 			priv->rf_paths = 2;
 			priv->rx_paths = 2;
 			priv->tx_paths = 2;
-			priv->usb_interrupts = 1;
+			priv->usb_interrupts = 0;
 			priv->rtl_chip = RTL8192C;
 		}
 		priv->has_wifi = 1;
@@ -1680,7 +1680,7 @@ static int rtl8xxxu_identify_chip(struct rtl8xxxu_priv *priv)
 		priv->rx_paths = 1;
 		priv->tx_paths = 1;
 		priv->rtl_chip = RTL8188C;
-		priv->usb_interrupts = 1;
+		priv->usb_interrupts = 0;
 		priv->has_wifi = 1;
 	}
 
-- 
2.20.1