linux-kernel - Re: [PATCH v3 0/8] arm64: rockchip: Initial GeekBox enablement

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Message-ID: <56E28B5D.6000708@st.com>
Date:	Fri, 11 Mar 2016 10:09:49 +0100
From:	Giuseppe CAVALLARO <peppe.cavallaro@...com>
To:	Dinh Nguyen <dinh.linux@...il.com>,
	Tomeu Vizoso <tomeu@...euvizoso.net>
CC:	Andreas Färber <afaerber@...e.de>,
	Fabrice GASNIER <fabrice.gasnier@...com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Heiko Stübner <heiko@...ech.de>,
	<netdev@...r.kernel.org>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	LAKML <linux-arm-kernel@...ts.infradead.org>,
	Gabriel Fernandez <gabriel.fernandez@...aro.org>,
	Alexandre TORGUE <alexandre.torgue@...com>,
	Frank Schäfer <fschaefer.oss@...glemail.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 0/8] arm64: rockchip: Initial GeekBox enablement

On 3/10/2016 5:47 PM, Dinh Nguyen wrote:
> On Thu, Mar 10, 2016 at 3:13 AM, Giuseppe CAVALLARO
> <peppe.cavallaro@...com> wrote:
>> On 3/9/2016 5:31 PM, Dinh Nguyen wrote:
>>>
>>> On Wed, Mar 9, 2016 at 8:53 AM, Giuseppe CAVALLARO
>>> <peppe.cavallaro@...com> wrote:
>>>>
>>>> Hi Tomeu, Dinh, Andreas
>>>>
>>>> I need a sum and help from you to go ahead on the
>>>> tx timeout.
>>>>
>>>> The "stmmac: MDIO fixes" seems to be the candidate to
>>>> fix the phy connection and I will send the V2 asap (Andreas' comment).
>>>>
>>>> So, supposing the probe is ok and phy is connected,
>>>> I need your input ...
>>>>
>>>>    Tomeu: after revering the 0e80bdc9a72d (stmmac: first frame
>>>>           prep at the end of xmit routine) the network is
>>>>           not stable and there is a timeout after a while.
>>>>           The box has 3.50 with normal desc settings.
>>>>
>>>>    Dinh: the network is ok, I wonder if you can share a boot
>>>>          log just to understand if the normal or enhanced
>>>>          descriptors are used.
>>>>
>>>
>>> Here it is:
>>
>> ...
>>>
>>> [    0.850523] stmmac - user ID: 0x10, Synopsys ID: 0x37
>>> [    0.855570]  Ring mode enabled
>>> [    0.858611]  DMA HW capability register supported
>>> [    0.863128]  Enhanced/Alternate descriptors
>>> [    0.867482]  Enabled extended descriptors
>>> [    0.871482]  RX Checksum Offload Engine supported (type 2)
>>> [    0.876948]  TX Checksum insertion supported
>>> [    0.881204]  Enable RX Mitigation via HW Watchdog Timer
>>> [    0.886863] socfpga-dwmac ff702000.ethernet eth0: No MDIO subnode found
>>> [    0.899090] libphy: stmmac: probed
>>> [    0.902484] eth0: PHY ID 00221611 at 4 IRQ POLL (stmmac-0:04) active
>>
>>
>> Thx Dinh, so you are using the Enhanced/Alternate descriptors
>> I am debugging on my side on a setup with normal descriptors, I let you
>> know
>>
>
> Doesn't the printout "Enhanced/Alternate descriptors"  mean that I'm using
> Enhanced/Alternate descriptors?

yes this means that you have the Databook 3.70a and, from the HW
capability register, the driver will use the Enhanced/Alternate
descriptors. This is the same HW I am using on my side where the
stmmac is working fine.

In the case where it is failing on net-next, although on Databook 3.50a,
the HW  capability register says that there is no enhanced descriptors
and the driver uses the normal ones.

Tomeu, I kindly ask you to try the patch attached. I found a bug on Tx
path for normal descriptors. Please let me know if this help.
Also let me know if we actually need to revert the 0e80bdc9a72d.

I am trying to find some HW where test the normal descriptors to
speed-up the tests on my side directly.

Let me know and thx in advance.

Regards,
Peppe

>
> Dinh
>

View attachment "0001-stmmac-fix-tx-prepare-for-normal-desc.patch" of type "text/x-patch" (1222 bytes)