* [PATCH] ARM: dts: imx6-sr-som: increase at8035 PHY gigabit Tw parameter
@ 2021-01-15 23:36 Russell King
2021-01-29 7:07 ` Shawn Guo
0 siblings, 1 reply; 2+ messages in thread
From: Russell King @ 2021-01-15 23:36 UTC (permalink / raw)
To: Shawn Guo
Cc: devicetree, Sascha Hauer, Rob Herring, NXP Linux Team,
Pengutronix Kernel Team, Fabio Estevam, linux-arm-kernel
Increase the SmartEEE Tw parameter for Atheros PHYs to stop gigabit
links from sporadically dropping. Jon Nettleton found that a value
of 23 was the minimum to give a stable link, but testing with the
Com Express 7 module shows 24 is the minimum - so 23 may still be on
the margins. Use 24 instead for consistency across SolidRun platforms.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
The corresponding part of this has been merged into net-next:
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=e7fa5c80defe079190537fd6b6aecb8866b446a3
arch/arm/boot/dts/imx6qdl-sr-som.dtsi | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm/boot/dts/imx6qdl-sr-som.dtsi b/arch/arm/boot/dts/imx6qdl-sr-som.dtsi
index 1d1f9ec27045..fd387960a2c9 100644
--- a/arch/arm/boot/dts/imx6qdl-sr-som.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-sr-som.dtsi
@@ -69,10 +69,12 @@
ethernet-phy@0 {
reg = <0>;
qca,clk-out-frequency = <125000000>;
+ qca,smarteee-tw-us-1g = <24>;
};
ethernet-phy@4 {
reg = <4>;
qca,clk-out-frequency = <125000000>;
+ qca,smarteee-tw-us-1g = <24>;
};
};
};
--
2.20.1
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^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] ARM: dts: imx6-sr-som: increase at8035 PHY gigabit Tw parameter
2021-01-15 23:36 [PATCH] ARM: dts: imx6-sr-som: increase at8035 PHY gigabit Tw parameter Russell King
@ 2021-01-29 7:07 ` Shawn Guo
0 siblings, 0 replies; 2+ messages in thread
From: Shawn Guo @ 2021-01-29 7:07 UTC (permalink / raw)
To: Russell King
Cc: devicetree, Sascha Hauer, Rob Herring, NXP Linux Team,
Pengutronix Kernel Team, Fabio Estevam, linux-arm-kernel
On Fri, Jan 15, 2021 at 11:36:44PM +0000, Russell King wrote:
> Increase the SmartEEE Tw parameter for Atheros PHYs to stop gigabit
> links from sporadically dropping. Jon Nettleton found that a value
> of 23 was the minimum to give a stable link, but testing with the
> Com Express 7 module shows 24 is the minimum - so 23 may still be on
> the margins. Use 24 instead for consistency across SolidRun platforms.
>
> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Applied, thanks.
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linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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