linux-kernel - Re: [PATCH net 1/3] net: lan743x: disable WOL upon resume to restore full data path operation

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Date: Mon, 26 Feb 2024 09:27:17 +0100
From: Horatiu Vultur <horatiu.vultur@...rochip.com>
To: Raju Lakkaraju <Raju.Lakkaraju@...rochip.com>
CC: <netdev@...r.kernel.org>, <davem@...emloft.net>, <kuba@...nel.org>,
	<linux-kernel@...r.kernel.org>, <bryan.whitehead@...rochip.com>,
	<richardcochran@...il.com>, <UNGLinuxDriver@...rochip.com>
Subject: Re: [PATCH net 1/3] net: lan743x: disable WOL upon resume to restore
 full data path operation

The 02/26/2024 13:39, Raju Lakkaraju wrote:
> In order for datapath to be restored to normal functionality after resume
> we disable all wakeup events. Additionally we clear all W1C status bits by
> writing 1's to them.

Have you run get_maintainer.pl before sending this?
To me it seems that Eric and Paolo are missing from the email list.

> 
> Fixes: 4d94282afd95 ("lan743x: Add power management support")
> Signed-off-by: Raju Lakkaraju <Raju.Lakkaraju@...rochip.com>
> ---
>  drivers/net/ethernet/microchip/lan743x_main.c | 24 ++++++++++++++++++-
>  drivers/net/ethernet/microchip/lan743x_main.h | 24 +++++++++++++++++++
>  2 files changed, 47 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/microchip/lan743x_main.c b/drivers/net/ethernet/microchip/lan743x_main.c
> index 45e209a7d083..5641b466d70d 100644
> --- a/drivers/net/ethernet/microchip/lan743x_main.c
> +++ b/drivers/net/ethernet/microchip/lan743x_main.c
> @@ -3550,7 +3550,7 @@ static void lan743x_pm_set_wol(struct lan743x_adapter *adapter)
>  
>  	/* clear wake settings */
>  	pmtctl = lan743x_csr_read(adapter, PMT_CTL);
> -	pmtctl |= PMT_CTL_WUPS_MASK_;
> +	pmtctl |= PMT_CTL_WUPS_MASK_ | PMT_CTL_RES_CLR_WKP_MASK_;
>  	pmtctl &= ~(PMT_CTL_GPIO_WAKEUP_EN_ | PMT_CTL_EEE_WAKEUP_EN_ |
>  		PMT_CTL_WOL_EN_ | PMT_CTL_MAC_D3_RX_CLK_OVR_ |
>  		PMT_CTL_RX_FCT_RFE_D3_CLK_OVR_ | PMT_CTL_ETH_PHY_WAKE_EN_);
> @@ -3685,6 +3685,7 @@ static int lan743x_pm_resume(struct device *dev)
>  	struct pci_dev *pdev = to_pci_dev(dev);
>  	struct net_device *netdev = pci_get_drvdata(pdev);
>  	struct lan743x_adapter *adapter = netdev_priv(netdev);
> +	int data;
>  	int ret;
>  
>  	pci_set_power_state(pdev, PCI_D0);
> @@ -3715,6 +3716,27 @@ static int lan743x_pm_resume(struct device *dev)
>  	netif_info(adapter, drv, adapter->netdev,
>  		   "Wakeup source : 0x%08X\n", ret);
>  
> +	/* Clear the wol configuration and status bits when system
> +	 * events occurs.
> +	 * The status bits are "Write One to Clear (W1C)"
> +	 */
> +	data = MAC_WUCSR_EEE_TX_WAKE_ | MAC_WUCSR_EEE_RX_WAKE_ |
> +	       MAC_WUCSR_RFE_WAKE_FR_ | MAC_WUCSR_PFDA_FR_ | MAC_WUCSR_WUFR_ |
> +	       MAC_WUCSR_MPR_ | MAC_WUCSR_BCAST_FR_;
> +	lan743x_csr_write(adapter, MAC_WUCSR, data);
> +
> +	data = MAC_WUCSR2_NS_RCD_ | MAC_WUCSR2_ARP_RCD_ |
> +	       MAC_WUCSR2_IPV6_TCPSYN_RCD_ | MAC_WUCSR2_IPV4_TCPSYN_RCD_;
> +	lan743x_csr_write(adapter, MAC_WUCSR2, data);
> +
> +	data = MAC_WK_SRC_ETH_PHY_WK_ | MAC_WK_SRC_IPV6_TCPSYN_RCD_WK_ |
> +	       MAC_WK_SRC_IPV4_TCPSYN_RCD_WK_ | MAC_WK_SRC_EEE_TX_WK_ |
> +	       MAC_WK_SRC_EEE_RX_WK_ | MAC_WK_SRC_RFE_FR_WK_ |
> +	       MAC_WK_SRC_PFDA_FR_WK_ | MAC_WK_SRC_MP_FR_WK_ |
> +	       MAC_WK_SRC_BCAST_FR_WK_ | MAC_WK_SRC_WU_FR_WK_ |
> +	       MAC_WK_SRC_WK_FR_SAVED_;
> +	lan743x_csr_write(adapter, MAC_WK_SRC, data);
> +
>  	return 0;
>  }
>  
> diff --git a/drivers/net/ethernet/microchip/lan743x_main.h b/drivers/net/ethernet/microchip/lan743x_main.h
> index be79cb0ae5af..77fc3abc1428 100644
> --- a/drivers/net/ethernet/microchip/lan743x_main.h
> +++ b/drivers/net/ethernet/microchip/lan743x_main.h
> @@ -60,6 +60,7 @@
>  #define PMT_CTL_RX_FCT_RFE_D3_CLK_OVR_		BIT(18)
>  #define PMT_CTL_GPIO_WAKEUP_EN_			BIT(15)
>  #define PMT_CTL_EEE_WAKEUP_EN_			BIT(13)
> +#define PMT_CTL_RES_CLR_WKP_MASK_		GENMASK(9, 8)
>  #define PMT_CTL_READY_				BIT(7)
>  #define PMT_CTL_ETH_PHY_RST_			BIT(4)
>  #define PMT_CTL_WOL_EN_				BIT(3)
> @@ -226,12 +227,31 @@
>  #define MAC_WUCSR				(0x140)
>  #define MAC_MP_SO_EN_				BIT(21)
>  #define MAC_WUCSR_RFE_WAKE_EN_			BIT(14)
> +#define MAC_WUCSR_EEE_TX_WAKE_			BIT(13)
> +#define MAC_WUCSR_EEE_RX_WAKE_			BIT(11)
> +#define MAC_WUCSR_RFE_WAKE_FR_			BIT(9)
> +#define MAC_WUCSR_PFDA_FR_			BIT(7)
> +#define MAC_WUCSR_WUFR_				BIT(6)
> +#define MAC_WUCSR_MPR_				BIT(5)
> +#define MAC_WUCSR_BCAST_FR_			BIT(4)
>  #define MAC_WUCSR_PFDA_EN_			BIT(3)
>  #define MAC_WUCSR_WAKE_EN_			BIT(2)
>  #define MAC_WUCSR_MPEN_				BIT(1)
>  #define MAC_WUCSR_BCST_EN_			BIT(0)
>  
>  #define MAC_WK_SRC				(0x144)
> +#define MAC_WK_SRC_ETH_PHY_WK_			BIT(17)
> +#define MAC_WK_SRC_IPV6_TCPSYN_RCD_WK_		BIT(16)
> +#define MAC_WK_SRC_IPV4_TCPSYN_RCD_WK_		BIT(15)
> +#define MAC_WK_SRC_EEE_TX_WK_			BIT(14)
> +#define MAC_WK_SRC_EEE_RX_WK_			BIT(13)
> +#define MAC_WK_SRC_RFE_FR_WK_			BIT(12)
> +#define MAC_WK_SRC_PFDA_FR_WK_			BIT(11)
> +#define MAC_WK_SRC_MP_FR_WK_			BIT(10)
> +#define MAC_WK_SRC_BCAST_FR_WK_			BIT(9)
> +#define MAC_WK_SRC_WU_FR_WK_			BIT(8)
> +#define MAC_WK_SRC_WK_FR_SAVED_			BIT(7)
> +
>  #define MAC_MP_SO_HI				(0x148)
>  #define MAC_MP_SO_LO				(0x14C)
>  
> @@ -294,6 +314,10 @@
>  #define RFE_INDX(index)			(0x580 + (index << 2))
>  
>  #define MAC_WUCSR2			(0x600)
> +#define MAC_WUCSR2_NS_RCD_		BIT(7)
> +#define MAC_WUCSR2_ARP_RCD_		BIT(6)
> +#define MAC_WUCSR2_IPV6_TCPSYN_RCD_	BIT(5)
> +#define MAC_WUCSR2_IPV4_TCPSYN_RCD_	BIT(4)
>  
>  #define SGMII_ACC			(0x720)
>  #define SGMII_ACC_SGMII_BZY_		BIT(31)
> -- 
> 2.34.1
> 

-- 
/Horatiu