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Message-ID: <ZYPmZj8l01eQsDS5@debian.cyg>
Date: Thu, 21 Dec 2023 15:16:54 +0800
From: fuyao <fuyao@...erm.com>
To: Jernej Škrabec <jernej.skrabec@...il.com>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>,
Jose Abreu <joabreu@...opsys.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Chen-Yu Tsai <wens@...e.org>, Samuel Holland <samuel@...lland.org>,
Maxime Coquelin <mcoquelin.stm32@...il.com>, netdev@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
linux-stm32@...md-mailman.stormreply.com,
linux-kernel@...r.kernel.org,
麦健建 <maijianzhang@...winnertech.com>
Subject: Re: [PATCH] gmac: sun8i: r40: add gmac tx_delay support
On Wed, Dec 20, 2023 at 06:04:28PM +0100, Jernej Škrabec wrote:
> Dne sreda, 20. december 2023 ob 10:08:25 CET je fuyao napisal(a):
> > r40 can support tx_delay, so we add it.
>
> I don't see how. User manual, 3.3.4.64. GMAC Clock Register talks only
> about RX delay.
>
I don't see it in the user manual also.
it works fine in 100M, but it doesn't work good in 1G without tx_delay
in my board.
Read the sdk from allwinner I found in:
https://sourcegraph.com/github.com/tinalinux/linux-3.10/-/blob/arch/arm/boot/dts/sun8iw11p1.dtsi?L1826
https://sourcegraph.com/github.com/tinalinux/linux-3.10@r40-v1.y/-/blob/drivers/net/ethernet/allwinner/sunxi-gmac.c?L877
And I add it to my board, it works fine.
So, I think it may be exist register but not documented.
Best regards,
fuyao
> Best regards,
> Jernej
>
> >
> > Signed-off-by: fuyao <fuyao1697@....com>
> > ---
> > drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c | 1 +
> > 1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
> > index 137741b94122..fd07573afc9b 100644
> > --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
> > +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
> > @@ -127,6 +127,7 @@ static const struct emac_variant emac_variant_r40 = {
> > .support_mii = true,
> > .support_rgmii = true,
> > .rx_delay_max = 7,
> > + .tx_delay_max = 7,
> > };
> >
> > static const struct emac_variant emac_variant_a64 = {
> >
>
>
>
>
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