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From 0640e5cd53bc004be1a9a1af6d340baab44d9351 Mon Sep 17 00:00:00 2001
From: Jes Sorensen <Jes.Sorensen@redhat.com>
Date: Thu, 16 Jun 2016 14:46:05 -0400
Subject: [PATCH] rtl8xxxu: Make DMA aggregation optional by setting a module
parameter
Let the default to off until we have more data on the right default
tuning values.
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
---
drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
@@ -44,6 +44,7 @@
int rtl8xxxu_debug = RTL8XXXU_DEBUG_EFUSE;
static bool rtl8xxxu_ht40_2g;
+static bool rtl8xxxu_dma_aggregation;
MODULE_AUTHOR("Jes Sorensen <Jes.Sorensen@redhat.com>");
MODULE_DESCRIPTION("RTL8XXXu USB mac80211 Wireless LAN Driver");
@@ -62,6 +63,8 @@ module_param_named(debug, rtl8xxxu_debug
MODULE_PARM_DESC(debug, "Set debug mask");
module_param_named(ht40_2g, rtl8xxxu_ht40_2g, bool, 0600);
MODULE_PARM_DESC(ht40_2g, "Enable HT40 support on the 2.4GHz band");
+module_param_named(dma_aggregation, rtl8xxxu_dma_aggregation, bool, 0600);
+MODULE_PARM_DESC(dma_aggregation, "Enable DMA packet aggregation");
#define USB_VENDOR_ID_REALTEK 0x0bda
#define RTL8XXXU_RX_URBS 32
@@ -4411,14 +4414,18 @@ void rtl8xxxu_gen1_init_aggregation(stru
usb_spec = rtl8xxxu_read8(priv, REG_USB_SPECIAL_OPTION);
usb_spec &= ~USB_SPEC_USB_AGG_ENABLE;
+ rtl8xxxu_write8(priv, REG_USB_SPECIAL_OPTION, usb_spec);
agg_ctrl = rtl8xxxu_read8(priv, REG_TRXDMA_CTRL);
agg_ctrl &= ~TRXDMA_CTRL_RXDMA_AGG_EN;
- agg_ctrl |= TRXDMA_CTRL_RXDMA_AGG_EN;
+ if (!rtl8xxxu_dma_aggregation) {
+ rtl8xxxu_write8(priv, REG_TRXDMA_CTRL, agg_ctrl);
+ return;
+ }
+ agg_ctrl |= TRXDMA_CTRL_RXDMA_AGG_EN;
rtl8xxxu_write8(priv, REG_TRXDMA_CTRL, agg_ctrl);
- rtl8xxxu_write8(priv, REG_USB_SPECIAL_OPTION, usb_spec);
/*
* The number of packets we can take looks to be buffer size / 512
|
