netdev - Re: [PATCH net-next v3 4/7] net: dsa: mt7530: move XTAL check to mt7530

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Message-ID: <f6234b46-ce30-4b2a-9681-15633a06feff@arinc9.com>
Date: Sun, 4 Feb 2024 16:55:40 +0300
From: Arınç ÜNAL <arinc.unal@...nc9.com>
To: Daniel Golle <daniel@...rotopia.org>
Cc: "Russell King (Oracle)" <linux@...linux.org.uk>,
 DENG Qingfang <dqfext@...il.com>, Sean Wang <sean.wang@...iatek.com>,
 Andrew Lunn <andrew@...n.ch>, Florian Fainelli <f.fainelli@...il.com>,
 Vladimir Oltean <olteanv@...il.com>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 mithat.guner@...ont.com, erkin.bozoglu@...ont.com,
 Bartel Eerdekens <bartel.eerdekens@...stell8.be>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net-next v3 4/7] net: dsa: mt7530: move XTAL check to
 mt7530_setup()

On 2.02.2024 21:39, Daniel Golle wrote:
> On Fri, Feb 02, 2024 at 09:16:02PM +0300, Arınç ÜNAL wrote:
>> On 2.02.2024 14:48, Russell King (Oracle) wrote:
>>> On Fri, Feb 02, 2024 at 12:19:10PM +0300, Arınç ÜNAL via B4 Relay wrote:
>>>> From: Arınç ÜNAL <arinc.unal@...nc9.com>
>>>>
>>>> The crystal frequency concerns the switch core. The frequency should be
>>>> checked when the switch is being set up so the driver can reject the
>>>> unsupported hardware earlier and without requiring port 6 to be used.
>>>>
>>>> Move it to mt7530_setup(). Drop the unnecessary function printing.
>>>>
>>>> Signed-off-by: Arınç ÜNAL <arinc.unal@...nc9.com>
>>>> Reviewed-by: Andrew Lunn <andrew@...n.ch>
>>>> Reviewed-by: Vladimir Oltean <olteanv@...il.com>
>>>
>>> I would prefer this to be earlier in the series, before patch 2 which
>>> moves mt7530_setup_port6() to be called from mac_config(). mac_config()
>>> is supposed to be configuration error-free - in other words, all state
>>> should have been checked before hand.
>>
>> I agree but mt7530_mac_config() is not a void function yet. The
>> mac_port_config member of the mt753x_info structure points to this
>> function. My next patch series gets rid of all useless error returns on the
>> phylink path and change mac_port_config to void. So I don't think working
>> on this patch series further will worth the effort. I'd rather have this
>> version applied as is.
> 
> I agree regarding not changing the patch itself, but I also agree
> with Russell regarding the patch ordering. I know it's a 10-minute
> git headache to rebase the patches on top of each other in a different
> order, but you can easily compare the end result being identical to
> what you had before and hence don't need to retest.

This is not about laziness. This is before patch 2:

phylink_mac_ops :: mac_config() -> dsa_port_phylink_mac_config()
-> dsa_switch_ops :: phylink_mac_config() -> mt753x_phylink_mac_config()
    -> mt753x_mac_config()
       -> mt753x_info :: mac_port_config() -> mt7530_mac_config()
          -> mt7530_setup_port5()
    -> mt753x_pad_setup()
       -> mt753x_info :: pad_setup() -> mt7530_pad_clk_setup()

This is after:

phylink_mac_ops :: mac_config() -> dsa_port_phylink_mac_config()
-> dsa_switch_ops :: phylink_mac_config() -> mt753x_phylink_mac_config()
    -> mt753x_mac_config()
       -> mt753x_info :: mac_port_config() -> mt7530_mac_config()
          -> mt7530_setup_port5()
          -> mt7530_setup_port6()

Patch 2 does not move mt7530_setup_port6() to be called from
phylink_mac_ops :: mac_config(), it already is. There is no valid reason to
reorder the patches.

My response to Russell should've stated this instead of focusing on his
second sentence.

pw-bot: under-review

Arınç