rtl8xxxu: Flush FIFO before powering down devices

This should help when reloading the driver for 8723bu devices

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.c
index ef60e83..e444e2b 100644 (file)
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.c
@@ -5687,6 +5687,36 @@ static int rtl8xxxu_emu_to_disabled(struct rtl8xxxu_priv *priv)
        return 0;
 }
 
+static int rtl8xxxu_flush_fifo(struct rtl8xxxu_priv *priv)
+{
+       u32 val32;
+       int retry, retval;
+
+       rtl8xxxu_write8(priv, REG_TXPAUSE, 0xff);
+
+       val32 = rtl8xxxu_read32(priv, REG_RXPKT_NUM);
+       val32 |= RXPKT_NUM_RW_RELEASE_EN;
+       rtl8xxxu_write32(priv, REG_RXPKT_NUM, val32);
+
+       retry = 100;
+       retval = -EBUSY;
+
+       do {
+               val32 = rtl8xxxu_read32(priv, REG_RXPKT_NUM);
+               if (val32 & RXPKT_NUM_RXDMA_IDLE) {
+                       retval = 0;
+                       break;
+               }
+       } while (retry--);
+
+       rtl8xxxu_write16(priv, REG_RQPN_NPQ, 0);
+       rtl8xxxu_write32(priv, REG_RQPN, 0x80000000);
+       mdelay(2);
+       pr_info("%s: retry %i\n", __func__, retry);
+
+       return retval;
+}
+
 static int rtl8723au_power_on(struct rtl8xxxu_priv *priv)
 {
        u8 val8;
@@ -5957,6 +5987,8 @@ static void rtl8xxxu_power_off(struct rtl8xxxu_priv *priv)
                rtl8xxxu_write32(priv, REG_FPGA0_XCD_RF_PARM, val32);
        }
 
+       rtl8xxxu_flush_fifo(priv);
+
        rtl8xxxu_active_to_lps(priv);
 
        /* Turn off RF */
@@ -5995,6 +6027,8 @@ static void rtl8723bu_power_off(struct rtl8xxxu_priv *priv)
        u8 val8;
        u16 val16;
 
+       rtl8xxxu_flush_fifo(priv);
+
        /*
         * Disable TX report timer
         */

diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_regs.h b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_regs.h
index a8d5c9f..e545e84 100644 (file)
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_regs.h
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_regs.h
@@ -404,6 +404,8 @@
 #define REG_RXDMA_AGG_PG_TH            0x0280
 #define  RXDMA_USB_AGG_ENABLE          BIT(31)
 #define REG_RXPKT_NUM                  0x0284
+#define  RXPKT_NUM_RXDMA_IDLE          BIT(17)
+#define  RXPKT_NUM_RW_RELEASE_EN       BIT(18)
 #define REG_RXDMA_STATUS               0x0288
 
 /* Presumably only found on newer chips such as 8723bu */