linux-kernel - RE: [PATCH net-next 0/9] r8169:update hardware ephy parameter

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Message-ID: <80377ECBC5453840BA8C7155328B537701085AD8@RTITMBSV03.realtek.com.tw>
Date:	Wed, 10 Dec 2014 07:17:04 +0000
From:	Hau <hau@...ltek.com>
To:	David Miller <davem@...emloft.net>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	nic_swsd <nic_swsd@...ltek.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH net-next 0/9] r8169:update hardware ephy parameter

> From: David Miller [mailto:davem@...emloft.net]
> Sent: Wednesday, December 10, 2014 7:36 AM
> To: Hau
> Cc: netdev@...r.kernel.org; nic_swsd; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH net-next 0/9] r8169:update hardware ephy parameter
> 
> From: Chunhao Lin <hau@...ltek.com>
> Date: Wed, 10 Dec 2014 00:45:54 +0800
> 
> > Update hardware ephy parameter to improve pcie compatibility.
> 
> This really doesn't tell me anything, I really dislike patch series like this one.
> 
> All of the programming is magic values to magic offsets.
> 
> You aren't even trying to describe in the commit log message exactly what
> kind of settings are being changed, and exactly how those changes achieve
> the stated goal.
> 
> Furthermore, the commit description makes no sense at all to me.
> 
> How can programming the ethernet MAC PHY have any influence on PCI-E
> bus compatability?  Or are you programming the PCI bus interface's PHY?
> 
> In what way are you adjusting which settings and in what way do those
> adjustments help improve PCI-E bus behavior?
> 
> You absolutely must describe exactly what the new programming is actually
> doing, precisely, and in detail.  I want to know if some kind of timings are
> being adjusted, and in what way.
> Are some fifo limits being changes?  If so, in what way, and why does that
> help.
> 
> You have to describe what you are doing. Short and non-informative commit
> log messages alongside random changes to undocumented magic constant
> registers is simply unacceptable.
> 

These series patch is an alignment with our latest hardware pcie ephy parameters. I will try to explain more on my next patch.

Thanks.
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