netdev - Re: [PATCH] r8169: Reinstate ALDPS and ASPM support

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Message-Id: <8BAED2AC-DA94-4F63-BA16-EB3D54649BC5@canonical.com>
Date:   Wed, 6 Jun 2018 14:47:36 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     David Miller <davem@...emloft.net>,
        Hayes Wang <hayeswang@...ltek.com>, hkallweit1@...il.com,
        romieu@...zoreil.com, Linux Netdev List <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ryankao <ryankao@...ltek.com>
Subject: Re: [PATCH] r8169: Reinstate ALDPS and ASPM support

at 22:11, Andrew Lunn <andrew@...n.ch> wrote:

> On Tue, Jun 05, 2018 at 12:58:12PM +0800, Kai-Heng Feng wrote:
>> This patch reinstate ALDPS and ASPM support on r8169.
>>
>> On some Intel platforms, ASPM support on r8169 is the key factor to let
>> Package C-State achieve PC8. Without ASPM support, the deepest Package
>> C-State can hit is PC3. PC8 can save additional ~3W in comparison with
>> PC3.
>>
>> This patch is from Realtek.
>>
>> Fixes: e0c075577965 ("r8169: enable ALDPS for power saving")
>> Fixes: d64ec841517a ("r8169: enable internal ASPM and clock request  
>> settings")
>>
>> Cc: Ryankao <ryankao@...ltek.com>
>> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
>> ---
>>  drivers/net/ethernet/realtek/r8169.c | 190 +++++++++++++++++++++------
>>  1 file changed, 151 insertions(+), 39 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/realtek/r8169.c  
>> b/drivers/net/ethernet/realtek/r8169.c
>> index 75dfac0248f4..a28ef20be221 100644
>> --- a/drivers/net/ethernet/realtek/r8169.c
>> +++ b/drivers/net/ethernet/realtek/r8169.c
>> @@ -319,6 +319,8 @@ static const struct pci_device_id rtl8169_pci_tbl[]  
>> = {
>>
>>  MODULE_DEVICE_TABLE(pci, rtl8169_pci_tbl);
>>
>> +static int enable_aspm = 1;
>> +static int enable_aldps = 1;
>>  static int use_dac = -1;
>>  static struct {
>>  	u32 msg_enable;
>> @@ -817,6 +819,10 @@ struct rtl8169_private {
>>
>>  MODULE_AUTHOR("Realtek and the Linux r8169 crew <netdev@...r.kernel.org>");
>>  MODULE_DESCRIPTION("RealTek RTL-8169 Gigabit Ethernet driver");
>> +module_param(enable_aspm, int, 0);
>> +MODULE_PARM_DESC(enable_aspm, "Enable ASPM");
>> +module_param(enable_aldps, int, 0);
>> +MODULE_PARM_DESC(enable_aldps, "Enable ALDPS");
>
> Hi Kai
>
> No module parameter please. Just turn it on by default. Assuming
> testing shows works.

Hi Andrew,

Sure.

Do you think we should also strip out the enable/disable logic?

Or just remove the parameter?

Kai-Heng

>
> 	Andrew