package/kernel/mac80211/patches/brcm/329-v5.0-0006-brcmfmac-update-43012-F2-watermark-setting-to-fix-DM.patch

   1 From f95a8d9c6aca196f1ace5b2e53a3dd3bc491b1b3 Mon Sep 17 00:00:00 2001
   2 From: Naveen Gupta <naveen.gupta@cypress.com>
   3 Date: Wed, 21 Nov 2018 07:53:49 +0000
   4 Subject: [PATCH] brcmfmac: update 43012 F2 watermark setting to fix DMA Error
   5  during UDP RX Traffic
   6
   7 The number of words that the read FIFO has to contain except
   8 the end of frame before sends data back to the host.
   9 Max watermark = (512B - 2* (BurstLength))/4 =
  10 (512 - 128)/4 = 384/4 = 0x60
  11 so if burst length (i.e. BurstLength = 64) is increased,
  12 watermark has to be reduced. This is the optimal setting for this chip.
  13
  14 Reviewed-by: Arend van Spriel <arend.vanspriel@broadcom.com>
  15 Signed-off-by: Naveen Gupta <naveen.gupta@cypress.com>
  16 Signed-off-by: Chi-Hsien Lin <chi-hsien.lin@cypress.com>
  17 Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
  18 ---
  19  .../net/wireless/broadcom/brcm80211/brcmfmac/sdio.c  | 12 ++++++++++++
  20  1 file changed, 12 insertions(+)
  21
  22 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
  23 +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
  24 @@ -52,6 +52,7 @@
  25  /* watermark expressed in number of words */
  26  #define DEFAULT_F2_WATERMARK    0x8
  27  #define CY_4373_F2_WATERMARK    0x40
  28 +#define CY_43012_F2_WATERMARK    0x60
  29
  30  #ifdef DEBUG
  31
  32 @@ -4173,6 +4174,17 @@ static void brcmf_sdio_firmware_callback
  33                                            CY_4373_F2_WATERMARK |
  34                                            SBSDIO_MESBUSYCTRL_ENAB, &err);
  35                         break;
  36 +               case SDIO_DEVICE_ID_CYPRESS_43012:
  37 +                       brcmf_dbg(INFO, "set F2 watermark to 0x%x*4 bytes\n",
  38 +                                 CY_43012_F2_WATERMARK);
  39 +                       brcmf_sdiod_writeb(sdiod, SBSDIO_WATERMARK,
  40 +                                          CY_43012_F2_WATERMARK, &err);
  41 +                       devctl = brcmf_sdiod_readb(sdiod, SBSDIO_DEVICE_CTL,
  42 +                                                  &err);
  43 +                       devctl |= SBSDIO_DEVCTL_F2WM_ENAB;
  44 +                       brcmf_sdiod_writeb(sdiod, SBSDIO_DEVICE_CTL, devctl,
  45 +                                          &err);
  46 +                       break;
  47                 default:
  48                         brcmf_sdiod_writeb(sdiod, SBSDIO_WATERMARK,
  49                                            DEFAULT_F2_WATERMARK, &err);