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Commit 430b454c authored by Jes Sorensen's avatar Jes Sorensen Committed by Kalle Valo
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rtl8xxxu: Flush FIFO before powering down devices 



This should help when reloading the driver for 8723bu devices

Signed-off-by: default avatarJes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: default avatarKalle Valo <kvalo@codeaurora.org>
parent fe37d5f6

drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.c

+34 −0
Original line number Diff line number Diff line
@@ -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

	 */

drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_regs.h

+2 −0
Original line number Diff line number Diff line
@@ -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 */