package/kernel/mac80211/patches/650-0015-rtl8xxxu-Make-DMA-aggregation-optional-by-setting-a-.patch

   1 From 0640e5cd53bc004be1a9a1af6d340baab44d9351 Mon Sep 17 00:00:00 2001
   2 From: Jes Sorensen <Jes.Sorensen@redhat.com>
   3 Date: Thu, 16 Jun 2016 14:46:05 -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 ---
  12  drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c | 11 +++++++++--
  13  1 file changed, 9 insertions(+), 2 deletions(-)
  14
  15 --- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
  16 +++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
  17 @@ -44,6 +44,7 @@
  18
  19  int rtl8xxxu_debug = RTL8XXXU_DEBUG_EFUSE;
  20  static bool rtl8xxxu_ht40_2g;
  21 +static bool rtl8xxxu_dma_aggregation;
  22
  23  MODULE_AUTHOR("Jes Sorensen <Jes.Sorensen@redhat.com>");
  24  MODULE_DESCRIPTION("RTL8XXXu USB mac80211 Wireless LAN Driver");
  25 @@ -62,6 +63,8 @@ module_param_named(debug, rtl8xxxu_debug
  26  MODULE_PARM_DESC(debug, "Set debug mask");
  27  module_param_named(ht40_2g, rtl8xxxu_ht40_2g, bool, 0600);
  28  MODULE_PARM_DESC(ht40_2g, "Enable HT40 support on the 2.4GHz band");
  29 +module_param_named(dma_aggregation, rtl8xxxu_dma_aggregation, bool, 0600);
  30 +MODULE_PARM_DESC(dma_aggregation, "Enable DMA packet aggregation");
  31
  32  #define USB_VENDOR_ID_REALTEK          0x0bda
  33  #define RTL8XXXU_RX_URBS               32
  34 @@ -4411,14 +4414,18 @@ void rtl8xxxu_gen1_init_aggregation(stru
  35
  36         usb_spec = rtl8xxxu_read8(priv, REG_USB_SPECIAL_OPTION);
  37         usb_spec &= ~USB_SPEC_USB_AGG_ENABLE;
  38 +       rtl8xxxu_write8(priv, REG_USB_SPECIAL_OPTION, usb_spec);
  39
  40         agg_ctrl = rtl8xxxu_read8(priv, REG_TRXDMA_CTRL);
  41         agg_ctrl &= ~TRXDMA_CTRL_RXDMA_AGG_EN;
  42
  43 -       agg_ctrl |= TRXDMA_CTRL_RXDMA_AGG_EN;
  44 +       if (!rtl8xxxu_dma_aggregation) {
  45 +               rtl8xxxu_write8(priv, REG_TRXDMA_CTRL, agg_ctrl);
  46 +               return;
  47 +       }
  48
  49 +       agg_ctrl |= TRXDMA_CTRL_RXDMA_AGG_EN;
  50         rtl8xxxu_write8(priv, REG_TRXDMA_CTRL, agg_ctrl);
  51 -       rtl8xxxu_write8(priv, REG_USB_SPECIAL_OPTION, usb_spec);
  52
  53         /*
  54          * The number of packets we can take looks to be buffer size / 512