package/kernel/mac80211/patches/652-0010-rtl8xxxu-Make-DMA-aggregation-optional-by-setting-a-.patch

   1 From 82cce22acd8ec7c75087825f23c053a642e7b672 Mon Sep 17 00:00:00 2001
   2 From: Jes Sorensen <Jes.Sorensen@redhat.com>
   3 Date: Mon, 27 Jun 2016 12:32:08 -0400
   4 Subject: [PATCH] rtl8xxxu: Make DMA aggregation optional by setting a module
   5  parameter
   6
   7 Let the default to off until we have more data on the right default
   8 tuning values.
   9
  10 Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
  11 Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
  12 ---
  13  drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c | 11 +++++++++--
  14  1 file changed, 9 insertions(+), 2 deletions(-)
  15
  16 --- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
  17 +++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
  18 @@ -44,6 +44,7 @@
  19
  20  int rtl8xxxu_debug = RTL8XXXU_DEBUG_EFUSE;
  21  static bool rtl8xxxu_ht40_2g;
  22 +static bool rtl8xxxu_dma_aggregation;
  23
  24  MODULE_AUTHOR("Jes Sorensen <Jes.Sorensen@redhat.com>");
  25  MODULE_DESCRIPTION("RTL8XXXu USB mac80211 Wireless LAN Driver");
  26 @@ -62,6 +63,8 @@ module_param_named(debug, rtl8xxxu_debug
  27  MODULE_PARM_DESC(debug, "Set debug mask");
  28  module_param_named(ht40_2g, rtl8xxxu_ht40_2g, bool, 0600);
  29  MODULE_PARM_DESC(ht40_2g, "Enable HT40 support on the 2.4GHz band");
  30 +module_param_named(dma_aggregation, rtl8xxxu_dma_aggregation, bool, 0600);
  31 +MODULE_PARM_DESC(dma_aggregation, "Enable DMA packet aggregation");
  32
  33  #define USB_VENDOR_ID_REALTEK          0x0bda
  34  #define RTL8XXXU_RX_URBS               32
  35 @@ -4411,14 +4414,18 @@ void rtl8xxxu_gen1_init_aggregation(stru
  36
  37         usb_spec = rtl8xxxu_read8(priv, REG_USB_SPECIAL_OPTION);
  38         usb_spec &= ~USB_SPEC_USB_AGG_ENABLE;
  39 +       rtl8xxxu_write8(priv, REG_USB_SPECIAL_OPTION, usb_spec);
  40
  41         agg_ctrl = rtl8xxxu_read8(priv, REG_TRXDMA_CTRL);
  42         agg_ctrl &= ~TRXDMA_CTRL_RXDMA_AGG_EN;
  43
  44 -       agg_ctrl |= TRXDMA_CTRL_RXDMA_AGG_EN;
  45 +       if (!rtl8xxxu_dma_aggregation) {
  46 +               rtl8xxxu_write8(priv, REG_TRXDMA_CTRL, agg_ctrl);
  47 +               return;
  48 +       }
  49
  50 +       agg_ctrl |= TRXDMA_CTRL_RXDMA_AGG_EN;
  51         rtl8xxxu_write8(priv, REG_TRXDMA_CTRL, agg_ctrl);
  52 -       rtl8xxxu_write8(priv, REG_USB_SPECIAL_OPTION, usb_spec);
  53
  54         /*
  55          * The number of packets we can take looks to be buffer size / 512