netdev - Re: [PATCH 2/2] r8169: Reinstate ASPM Support

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Date:   Tue, 12 Jun 2018 21:35:47 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>, davem@...emloft.net
Cc:     ryankao@...ltek.com, hayeswang@...ltek.com, hau@...ltek.com,
        romieu@...zoreil.com, bhelgaas@...gle.com, netdev@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] r8169: Reinstate ASPM Support

On 12.06.2018 11:57, Kai-Heng Feng wrote:
> On newer Intel platforms, ASPM support in r8169 is the last missing
> puzzle to let Package C-State achieves PC8. Without ASPM support, the
> deepest Package C-State can hit is PC3.
> PC8 can save additional ~3W in comparison with PC3 on my testing
> platform.
> 
Maybe we should replace PC8 with "beyond PC3". My system
(Haswell 2961Y) reaches 50% PC7 + 5% PC9 + 45% PC10 now.
It never seems to use PC8.

> The original patch is from Realtek.
> 
Please add a link to this original patch.

> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> ---
> v2:
> - Remove module parameter.
> - Remove pci_disable_link_state().
> 
>  drivers/net/ethernet/realtek/r8169.c | 41 +++++++++++++++++++---------
>  1 file changed, 28 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
> index 9b55ce513a36..85f4e746b040 100644
> --- a/drivers/net/ethernet/realtek/r8169.c
> +++ b/drivers/net/ethernet/realtek/r8169.c
> @@ -5289,6 +5289,18 @@ static void rtl_pcie_state_l2l3_enable(struct rtl8169_private *tp, bool enable)
>  	RTL_W8(tp, Config3, data);
>  }
>  
> +static void rtl_hw_internal_aspm_clkreq_enable(struct rtl8169_private *tp,
> +					       bool enable)

Do we need this hw_internal in the function name?

> +{
> +	if (enable) {
> +		RTL_W8(tp, Config2, RTL_R8(tp, Config2) | ClkReqEn);
> +		RTL_W8(tp, Config5, RTL_R8(tp, Config5) | ASPM_en);
> +	} else {
> +		RTL_W8(tp, Config2, RTL_R8(tp, Config2) & ~ClkReqEn);
> +		RTL_W8(tp, Config5, RTL_R8(tp, Config5) & ~ASPM_en);
> +	}
> +}
> +
>  static void rtl_hw_start_8168bb(struct rtl8169_private *tp)
>  {
>  	RTL_W8(tp, Config3, RTL_R8(tp, Config3) & ~Beacon_en);
> @@ -5645,9 +5657,9 @@ static void rtl_hw_start_8168g_1(struct rtl8169_private *tp)
>  	rtl_hw_start_8168g(tp);
>  
>  	/* disable aspm and clock request before access ephy */
> -	RTL_W8(tp, Config2, RTL_R8(tp, Config2) & ~ClkReqEn);
> -	RTL_W8(tp, Config5, RTL_R8(tp, Config5) & ~ASPM_en);
> +	rtl_hw_internal_aspm_clkreq_enable(tp, false);
>  	rtl_ephy_init(tp, e_info_8168g_1, ARRAY_SIZE(e_info_8168g_1));
> +	rtl_hw_internal_aspm_clkreq_enable(tp, true);
>  }
>  
>  static void rtl_hw_start_8168g_2(struct rtl8169_private *tp)
> @@ -5680,9 +5692,9 @@ static void rtl_hw_start_8411_2(struct rtl8169_private *tp)
>  	rtl_hw_start_8168g(tp);
>  
>  	/* disable aspm and clock request before access ephy */
> -	RTL_W8(tp, Config2, RTL_R8(tp, Config2) & ~ClkReqEn);
> -	RTL_W8(tp, Config5, RTL_R8(tp, Config5) & ~ASPM_en);
> +	rtl_hw_internal_aspm_clkreq_enable(tp, false);
>  	rtl_ephy_init(tp, e_info_8411_2, ARRAY_SIZE(e_info_8411_2));
> +	rtl_hw_internal_aspm_clkreq_enable(tp, true);
>  }
>  
>  static void rtl_hw_start_8168h_1(struct rtl8169_private *tp)
> @@ -5699,8 +5711,7 @@ static void rtl_hw_start_8168h_1(struct rtl8169_private *tp)
>  	};
>  
>  	/* disable aspm and clock request before access ephy */
> -	RTL_W8(tp, Config2, RTL_R8(tp, Config2) & ~ClkReqEn);
> -	RTL_W8(tp, Config5, RTL_R8(tp, Config5) & ~ASPM_en);
> +	rtl_hw_internal_aspm_clkreq_enable(tp, false);
>  	rtl_ephy_init(tp, e_info_8168h_1, ARRAY_SIZE(e_info_8168h_1));
>  
>  	RTL_W32(tp, TxConfig, RTL_R32(tp, TxConfig) | TXCFG_AUTO_FIFO);
> @@ -5779,6 +5790,8 @@ static void rtl_hw_start_8168h_1(struct rtl8169_private *tp)
>  	r8168_mac_ocp_write(tp, 0xe63e, 0x0000);
>  	r8168_mac_ocp_write(tp, 0xc094, 0x0000);
>  	r8168_mac_ocp_write(tp, 0xc09e, 0x0000);
> +
> +	rtl_hw_internal_aspm_clkreq_enable(tp, true);
>  }
>  
>  static void rtl_hw_start_8168ep(struct rtl8169_private *tp)
> @@ -5830,11 +5843,12 @@ static void rtl_hw_start_8168ep_1(struct rtl8169_private *tp)
>  	};
>  
>  	/* disable aspm and clock request before access ephy */
> -	RTL_W8(tp, Config2, RTL_R8(tp, Config2) & ~ClkReqEn);
> -	RTL_W8(tp, Config5, RTL_R8(tp, Config5) & ~ASPM_en);
> +	rtl_hw_internal_aspm_clkreq_enable(tp, false);
>  	rtl_ephy_init(tp, e_info_8168ep_1, ARRAY_SIZE(e_info_8168ep_1));
>  
>  	rtl_hw_start_8168ep(tp);
> +
> +	rtl_hw_internal_aspm_clkreq_enable(tp, true);
>  }
>  
>  static void rtl_hw_start_8168ep_2(struct rtl8169_private *tp)
> @@ -5846,14 +5860,15 @@ static void rtl_hw_start_8168ep_2(struct rtl8169_private *tp)
>  	};
>  
>  	/* disable aspm and clock request before access ephy */
> -	RTL_W8(tp, Config2, RTL_R8(tp, Config2) & ~ClkReqEn);
> -	RTL_W8(tp, Config5, RTL_R8(tp, Config5) & ~ASPM_en);
> +	rtl_hw_internal_aspm_clkreq_enable(tp, false);
>  	rtl_ephy_init(tp, e_info_8168ep_2, ARRAY_SIZE(e_info_8168ep_2));
>  
>  	rtl_hw_start_8168ep(tp);
>  
>  	RTL_W8(tp, DLLPR, RTL_R8(tp, DLLPR) & ~PFM_EN);
>  	RTL_W8(tp, MISC_1, RTL_R8(tp, MISC_1) & ~PFM_D3COLD_EN);
> +
> +	rtl_hw_internal_aspm_clkreq_enable(tp, true);
>  }
>  
>  static void rtl_hw_start_8168ep_3(struct rtl8169_private *tp)
> @@ -5867,8 +5882,7 @@ static void rtl_hw_start_8168ep_3(struct rtl8169_private *tp)
>  	};
>  
>  	/* disable aspm and clock request before access ephy */
> -	RTL_W8(tp, Config2, RTL_R8(tp, Config2) & ~ClkReqEn);
> -	RTL_W8(tp, Config5, RTL_R8(tp, Config5) & ~ASPM_en);
> +	rtl_hw_internal_aspm_clkreq_enable(tp, false);
>  	rtl_ephy_init(tp, e_info_8168ep_3, ARRAY_SIZE(e_info_8168ep_3));
>  
>  	rtl_hw_start_8168ep(tp);
> @@ -5888,6 +5902,8 @@ static void rtl_hw_start_8168ep_3(struct rtl8169_private *tp)
>  	data = r8168_mac_ocp_read(tp, 0xe860);
>  	data |= 0x0080;
>  	r8168_mac_ocp_write(tp, 0xe860, data);
> +
> +	rtl_hw_internal_aspm_clkreq_enable(tp, true);
>  }
>  
>  static void rtl_hw_start_8168(struct rtl8169_private *tp)
> @@ -7646,7 +7662,6 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
>  	mii->reg_num_mask = 0x1f;
>  	mii->supports_gmii = cfg->has_gmii;
>  
> -
>  	/* enable device (incl. PCI PM wakeup and hotplug setup) */
>  	rc = pcim_enable_device(pdev);
>  	if (rc < 0) {
>