Re: [PATCH net-next 03/30] net: dsa: mt7530: properly support MT7531AE and MT7531BE

Arınç ÜNAL
2023-05-25T06:01:55Z

On 24.05.2023 17:48, Vladimir Oltean wrote:
> On Mon, May 22, 2023 at 03:15:05PM +0300, arinc9.unal@gmail.com wrote:
>> From: Arınç ÜNAL <arinc.unal@arinc9.com>
>>
>> Introduce the p5_sgmii field to store the information for whether port 5
>> has got SGMII or not.
>>
>> Move the comment about MT7531AE and MT7531BE to mt7531_setup(), where the
>> switch is identified.
>>
>> Get rid of mt7531_dual_sgmii_supported() now that priv->p5_sgmii stores the
>> information. Address the code where mt7531_dual_sgmii_supported() is used.
>>
>> Get rid of mt7531_is_rgmii_port() which just prints the opposite of
>> priv->p5_sgmii.
>>
>> Remove P5_INTF_SEL_GMAC5_SGMII. The p5_interface_select enum is supposed to
>> represent the mode that port 5 is being used in, not the hardware
>> information of port 5. Set p5_intf_sel to P5_INTF_SEL_GMAC5 instead, if
>> port 5 is not dsa_is_unused_port().
>>
>> Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
>> Acked-by: Daniel Golle <daniel@makrotopia.org>
>> ---
>
> Pretty busy patch, and after reading it, I'm not sure:
>
> - why? (this seems to be absent from the commit message)
> - how are MT7531AE and MT7531BE supported any more properly after this
> change, as the commit title claims
> - what is the overall effect, other than just refactoring. If that's
> all, what's written on the tin needs to be a better representation of
> what's inside.
>
> Pure refactoring is not a bad goal in itself, as long as we're on the
> same page that there is a justification which makes the new code better
> than the old one.

With this patch, instead of reading the MT7531_TOP_SIG_SR register
multiple times, the register will be read once and the value will be
stored on the p5_sgmii field. This saves unnecessary reads of the
register. I will mention this on the patch log.

This is already being done on the U-Boot driver.

https://github.com/u-boot/u-boot/blob/master/drivers/net/mtk_eth.c#L859

I think "improve MT7531AE and MT7531BE support" will be a better subject.

Arınç