From: Naveen Gupta Date: Wed, 21 Nov 2018 07:53:49 +0000 (+0000) Subject: brcmfmac: update 43012 F2 watermark setting to fix DMA Error during UDP RX Traffic X-Git-Tag: v5.0-rc1~129^2~19^2~32 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=f95a8d9c6aca196f1ace5b2e53a3dd3bc491b1b3;p=linux.git brcmfmac: update 43012 F2 watermark setting to fix DMA Error during UDP RX Traffic The number of words that the read FIFO has to contain except the end of frame before sends data back to the host. Max watermark = (512B - 2* (BurstLength))/4 = (512 - 128)/4 = 384/4 = 0x60 so if burst length (i.e. BurstLength = 64) is increased, watermark has to be reduced. This is the optimal setting for this chip. Reviewed-by: Arend van Spriel Signed-off-by: Naveen Gupta Signed-off-by: Chi-Hsien Lin Signed-off-by: Kalle Valo --- diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c index 73a034172c4c..fe0cb398ab44 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c @@ -52,6 +52,7 @@ /* watermark expressed in number of words */ #define DEFAULT_F2_WATERMARK 0x8 #define CY_4373_F2_WATERMARK 0x40 +#define CY_43012_F2_WATERMARK 0x60 #ifdef DEBUG @@ -4173,6 +4174,17 @@ static void brcmf_sdio_firmware_callback(struct device *dev, int err, CY_4373_F2_WATERMARK | SBSDIO_MESBUSYCTRL_ENAB, &err); break; + case SDIO_DEVICE_ID_CYPRESS_43012: + brcmf_dbg(INFO, "set F2 watermark to 0x%x*4 bytes\n", + CY_43012_F2_WATERMARK); + brcmf_sdiod_writeb(sdiod, SBSDIO_WATERMARK, + CY_43012_F2_WATERMARK, &err); + devctl = brcmf_sdiod_readb(sdiod, SBSDIO_DEVICE_CTL, + &err); + devctl |= SBSDIO_DEVCTL_F2WM_ENAB; + brcmf_sdiod_writeb(sdiod, SBSDIO_DEVICE_CTL, devctl, + &err); + break; default: brcmf_sdiod_writeb(sdiod, SBSDIO_WATERMARK, DEFAULT_F2_WATERMARK, &err);