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   1 From patchwork Thu Aug 29 11:29:59 2019
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   5 X-Patchwork-Submitter: Stanislaw Gruszka <sgruszka@redhat.com>
   6 X-Patchwork-Id: 11121089
   7 X-Patchwork-Delegate: kvalo@adurom.com
   8 From: Stanislaw Gruszka <sgruszka@redhat.com>
   9 To: linux-wireless@vger.kernel.org
  10 Subject: [PATCH 5.3] Revert "rt2800: enable TX_PIN_CFG_LNA_PE_ bits per band"
  11 Date: Thu, 29 Aug 2019 13:29:59 +0200
  12 Message-Id: <1567078199-3645-1-git-send-email-sgruszka@redhat.com>
  13 Sender: linux-wireless-owner@vger.kernel.org
  14 List-ID: <linux-wireless.vger.kernel.org>
  15 X-Mailing-List: linux-wireless@vger.kernel.org
  16
  17 This reverts commit 9ad3b55654455258a9463384edb40077439d879f.
  18
  19 As reported by Sergey:
  20
  21 "I got some problem after upgrade kernel to 5.2 version (debian testing
  22 linux-image-5.2.0-2-amd64). 5Ghz client  stopped to see AP.
  23 Some tests with 1metre distance between client-AP: 2.4Ghz  -22dBm, for
  24 5Ghz - 53dBm !, for longer distance (8m + walls) 2.4 - 61dBm, 5Ghz not
  25 visible."
  26
  27 It was identified that rx signal level degradation was caused by
  28 9ad3b5565445 ("rt2800: enable TX_PIN_CFG_LNA_PE_ bits per band").
  29 So revert this commit.
  30
  31 Cc: <stable@vger.kernel.org> # v5.1+
  32 Reported-and-tested-by: Sergey Maranchuk <slav0nic0@gmail.com>
  33 Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
  34 ---
  35  drivers/net/wireless/ralink/rt2x00/rt2800lib.c | 18 ++++++------------
  36  1 file changed, 6 insertions(+), 12 deletions(-)
  37
  38 --- a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
  39 +++ b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
  40 @@ -4242,24 +4242,18 @@ static void rt2800_config_channel(struct
  41         switch (rt2x00dev->default_ant.rx_chain_num) {
  42         case 3:
  43                 /* Turn on tertiary LNAs */
  44 -               rt2x00_set_field32(&tx_pin, TX_PIN_CFG_LNA_PE_A2_EN,
  45 -                                  rf->channel > 14);
  46 -               rt2x00_set_field32(&tx_pin, TX_PIN_CFG_LNA_PE_G2_EN,
  47 -                                  rf->channel <= 14);
  48 +               rt2x00_set_field32(&tx_pin, TX_PIN_CFG_LNA_PE_A2_EN, 1);
  49 +               rt2x00_set_field32(&tx_pin, TX_PIN_CFG_LNA_PE_G2_EN, 1);
  50                 /* fall-through */
  51         case 2:
  52                 /* Turn on secondary LNAs */
  53 -               rt2x00_set_field32(&tx_pin, TX_PIN_CFG_LNA_PE_A1_EN,
  54 -                                  rf->channel > 14);
  55 -               rt2x00_set_field32(&tx_pin, TX_PIN_CFG_LNA_PE_G1_EN,
  56 -                                  rf->channel <= 14);
  57 +               rt2x00_set_field32(&tx_pin, TX_PIN_CFG_LNA_PE_A1_EN, 1);
  58 +               rt2x00_set_field32(&tx_pin, TX_PIN_CFG_LNA_PE_G1_EN, 1);
  59                 /* fall-through */
  60         case 1:
  61                 /* Turn on primary LNAs */
  62 -               rt2x00_set_field32(&tx_pin, TX_PIN_CFG_LNA_PE_A0_EN,
  63 -                                  rf->channel > 14);
  64 -               rt2x00_set_field32(&tx_pin, TX_PIN_CFG_LNA_PE_G0_EN,
  65 -                                  rf->channel <= 14);
  66 +               rt2x00_set_field32(&tx_pin, TX_PIN_CFG_LNA_PE_A0_EN, 1);
  67 +               rt2x00_set_field32(&tx_pin, TX_PIN_CFG_LNA_PE_G0_EN, 1);
  68                 break;
  69         }
  70