netdev - Re: r8168 is needed to enter P-state: Package State 6 (pc6)onHaswell hardware: does the patch below against current kernel make a difference?

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Date:	Wed, 08 Oct 2014 22:29:16 +0200
From:	Ceriel Jacobs <linux-ide@...shplan.pro>
To:	Francois Romieu <romieu@...zoreil.com>,
	Hayes Wang <hayeswang@...ltek.com>
CC:	nic_swsd <nic_swsd@...ltek.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: r8168 is needed to enter P-state: Package State 6 (pc6)onHaswell
 hardware: does the patch below against current kernel make a difference?

Sorry for the delay. As newbie I first needed to learn about depmod to 
restore loading the r8169 module instead of r8168.

Now, I am struggling with applying the patch. Even with fuzz 99 applying 
this patch fails for hunk #2:

~/linux-3.13.0# patch -Np1 -F99 -r - --dry-run <<'END'
 > index 0921302..b4a3881 100644
...
 >  rtl_eri_write(tp, 0xb8, ERIAR_MASK_0011, 0x0000, ERIAR_EXGMAC);
 > END
checking file drivers/net/ethernet/realtek/r8169.c
Hunk #1 succeeded at 468 with fuzz 3.
Hunk #2 FAILED at 5280.
1 out of 2 hunks FAILED

~/linux-3.13.0# grep -nA8 'rtl_eri_write(tp, 0x2f8, ERIAR_MASK_0011, 
0x1d8f, ERIAR_EXGMAC)' drivers/net/ethernet/realtek/r8169.c
5274:	rtl_eri_write(tp, 0x2f8, ERIAR_MASK_0011, 0x1d8f, ERIAR_EXGMAC);
5275-
5276-	RTL_W8(ChipCmd, CmdTxEnb | CmdRxEnb);
5277-	RTL_W32(MISC, RTL_R32(MISC) & ~RXDV_GATED_EN);
5278-	RTL_W8(MaxTxPacketSize, EarlySize);
5279-
5280-	rtl_eri_write(tp, 0xc0, ERIAR_MASK_0011, 0x0000, ERIAR_EXGMAC);
5281-	rtl_eri_write(tp, 0xb8, ERIAR_MASK_0011, 0x0000, ERIAR_EXGMAC);
5282-

# ls -l $(locate drivers/net/ethernet/realtek/r8169.c)
-rw-r--r-- 1 root root 177933 Aug 12 23:42 
/home/user/src/linux-3.13.0/drivers/net/ethernet/realtek/r8169.c
-rw-r--r-- 1 root root 177933 Aug 24 22:41 
/root/linux-3.13.0/drivers/net/ethernet/realtek/r8169.c

# md5sum /root/linux-3.13.0/drivers/net/ethernet/realtek/r8169.c
95056b56932b375f8b65a6379009f704 
/root/linux-3.13.0/drivers/net/ethernet/realtek/r8169.c


Francois, could you help me apply your patch?


Francois Romieu schreef op 07-10-14 om 00:13:
> Hayes Wang <hayeswang@...ltek.com> :
>>   Francois Romieu [mailto:romieu@...zoreil.com]
> [...]
>> I don't sure if the following information is helpful. Besides, I remember
>> the rtl_init_one() would disable it.
>>
>> http://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git/commit/?id=d64ec841517a25f6d468bde9f67e5b4cffdc67c7
>>
>> http://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git/commit/?id=4521e1a94279ce610d3f9b7945c17d581f804242
>
> Yes, I did not expect this stuff to stay in geostationary orbit for long :o/
>
> Realtek's r8168 driver defaults to CONFIG_ASPM=1 but I guess some users
> need to disable it and there's no known pattern / blacklist, right ?
>
> Ceriel, does the patch below against current kernel make a difference ?
>
> diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
> index 0921302..b4a3881 100644
> --- a/drivers/net/ethernet/realtek/r8169.c
> +++ b/drivers/net/ethernet/realtek/r8169.c
> @@ -468,6 +468,7 @@ enum rtl8168_registers {
>   #define PWM_EN				(1 << 22)
>   #define RXDV_GATED_EN			(1 << 19)
>   #define EARLY_TALLY_EN			(1 << 16)
> +#define FORCE_CLK			(1 << 15) /* force clock request */
>   };
>
>   enum rtl_register_content {
> @@ -5279,8 +5280,10 @@ static void rtl_hw_start_8168g_1(struct rtl8169_private *tp)
>   	rtl_eri_write(tp, 0x2f8, ERIAR_MASK_0011, 0x1d8f, ERIAR_EXGMAC);
>
>   	RTL_W8(ChipCmd, CmdTxEnb | CmdRxEnb);
> -	RTL_W32(MISC, RTL_R32(MISC) & ~RXDV_GATED_EN);
> +	RTL_W32(MISC, (RTL_R32(MISC) | FORCE_CLK) & ~RXDV_GATED_EN);
>   	RTL_W8(MaxTxPacketSize, EarlySize);
> +	RTL_W8(Config5, RTL_R8(Config5) | ASPM_en);
> +	RTL_W8(Config2, RTL_R8(Config2) | ClkReqEn);
>
>   	rtl_eri_write(tp, 0xc0, ERIAR_MASK_0011, 0x0000, ERIAR_EXGMAC);
>   	rtl_eri_write(tp, 0xb8, ERIAR_MASK_0011, 0x0000, ERIAR_EXGMAC);
>
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