openwrt/package/kernel/mac80211/patches/653-0040-rtl8xxxu-Disable-packet-DMA-aggregation-on-8188eu.patch

From f435337a2fc97c97476d833700e4a8fd17d99007 Mon Sep 17 00:00:00 2001
From: Jes Sorensen <Jes.Sorensen@redhat.com>
Date: Wed, 10 Aug 2016 15:41:13 -0400
Subject: [PATCH] rtl8xxxu: Disable packet DMA aggregation on 8188eu

For now disable packet DMA aggregation on the 8188eu, rather then
risking the feature being left on by the init tables.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
---
 drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188e.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188e.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188e.c
@@ -461,6 +461,19 @@ void rtl8188eu_config_channel(struct iee
 	}
 }
 
+void rtl8188eu_init_aggregation(struct rtl8xxxu_priv *priv)
+{
+	u8 agg_ctrl, usb_spec;
+
+	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;
+	rtl8xxxu_write8(priv, REG_TRXDMA_CTRL, agg_ctrl);
+}
+
 static int rtl8188eu_parse_efuse(struct rtl8xxxu_priv *priv)
 {
 	struct rtl8188eu_efuse *efuse = &priv->efuse_wifi.efuse8188eu;
@@ -1223,6 +1236,7 @@ struct rtl8xxxu_fileops rtl8188eu_fops =
 	.phy_iq_calibrate = rtl8188eu_phy_iq_calibrate,
 	.config_channel = rtl8188eu_config_channel,
 	.parse_rx_desc = rtl8xxxu_parse_rxdesc16,
+	.init_aggregation = rtl8188eu_init_aggregation,
 	.enable_rf = rtl8188e_enable_rf,
 	.disable_rf = rtl8188e_disable_rf,
 	.usb_quirks = rtl8188e_usb_quirks,