netdev - Re: [PATCH] mt76: mt7615: do not advertise 5 GHz on first phy of MT7615D (DBDC)

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Date: Tue, 6 Jun 2023 11:16:26 +0200
From: Simon Horman <simon.horman@...igine.com>
To: Paul Fertser <fercerpav@...il.com>
Cc: linux-wireless@...r.kernel.org, Felix Fietkau <nbd@....name>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	Ryder Lee <ryder.lee@...iatek.com>,
	Shayne Chen <shayne.chen@...iatek.com>,
	Sean Wang <sean.wang@...iatek.com>, Kalle Valo <kvalo@...nel.org>,
	"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>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, Rani Hod <rani.hod@...il.com>,
	stable@...r.kernel.org
Subject: Re: [PATCH] mt76: mt7615: do not advertise 5 GHz on first phy of
 MT7615D (DBDC)

On Tue, Jun 06, 2023 at 12:12:51PM +0300, Paul Fertser wrote:
> Hi Simon,
> 
> On Tue, Jun 06, 2023 at 11:03:31AM +0200, Simon Horman wrote:
> > On Mon, Jun 05, 2023 at 10:34:07AM +0300, Paul Fertser wrote:
> > > On DBDC devices the first (internal) phy is only capable of using
> > > 2.4 GHz band, and the 5 GHz band is exposed via a separate phy object,
> > > so avoid the false advertising.
> > 
> > Can I clarify that the second object won't hit the logic change
> > below and thus be limited to 2GHz?
> 
> The second object (external 5 GHz phy) doesn't have an EEPROM of its
> own, and is created explicitly with just this band enabled:
> 
> https://elixir.bootlin.com/linux/latest/source/drivers/net/wireless/mediatek/mt76/mt7615/pci_init.c#L104
> https://elixir.bootlin.com/linux/latest/source/drivers/net/wireless/mediatek/mt76/mt7615/init.c#L573
> 
> So it won't hit the logic change and it will be limited to 5 GHz.

Thanks Paul,

in that case this patch looks good to me.

Reviewed-by: Simon Horman <simon.horman@...igine.com>