linux-kernel - Re: [PATCH] net: thunderx: use proper interface type for RGMII

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Message-Id: <20200208.152838.322440086718054291.davem@davemloft.net>
Date:   Sat, 08 Feb 2020 15:28:38 +0100 (CET)
From:   David Miller <davem@...emloft.net>
To:     tharvey@...eworks.com
Cc:     netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, rrichter@...vell.com,
        sgoutham@...vell.com, andrew@...n.ch
Subject: Re: [PATCH] net: thunderx: use proper interface type for RGMII

From: Tim Harvey <tharvey@...eworks.com>
Date: Fri,  7 Feb 2020 12:40:26 -0800

> The configuration of the OCTEONTX XCV_DLL_CTL register via
> xcv_init_hw() is such that the RGMII RX delay is bypassed
> leaving the RGMII TX delay enabled in the MAC:
> 
> 	/* Configure DLL - enable or bypass
> 	 * TX no bypass, RX bypass
> 	 */
> 	cfg = readq_relaxed(xcv->reg_base + XCV_DLL_CTL);
> 	cfg &= ~0xFF03;
> 	cfg |= CLKRX_BYP;
> 	writeq_relaxed(cfg, xcv->reg_base + XCV_DLL_CTL);
> 
> This would coorespond to a interface type of PHY_INTERFACE_MODE_RGMII_RXID
> and not PHY_INTERFACE_MODE_RGMII.
> 
> Fixing this allows RGMII PHY drivers to do the right thing (enable
> RX delay in the PHY) instead of erroneously enabling both delays in the
> PHY.
> 
> Signed-off-by: Tim Harvey <tharvey@...eworks.com>

Applied, thanks.