netdev - set mtu size broken for dwmac-sun8i

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Date:   Wed, 17 Mar 2021 10:19:26 +0100
From:   Belisko Marek <marek.belisko@...il.com>
To:     netdev <netdev@...r.kernel.org>
Subject: set mtu size broken for dwmac-sun8i

Hi,

I'm hunting an issue when setting mtu failed for dwmac-sun8i driver.
Basically adding more debug shows that in stmmac_change_mtu
tx_fifo_size is 0 and in this case EINVAL is reported. Isaw there was
fix for similar driver dwmac-sunxi driver by:
806fd188ce2a4f8b587e83e73c478e6484fbfa55

IIRC dwmac-sun8i should get tx and rx fifo size from dma but seems
it's not the case. I'm using 5.4 kernel LTS release. Any ideas?

Thanks and BR,

marek

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