2018-04-24 03:04:06

by Ooi, Joyce

Subject: [PATCH] arm64: dts: stratix10: Change pad skew values for EMAC0 PHY driver

The HPS EMAC0 drive strength is changed to 4mA because the initial 8mA
drive strength has caused CE test to fail. This requires changes on the
pad skew for EMAC0 PHY driver. Based on several measurements done, Tx
clock does not require the extra 0.96ns delay.

Signed-off-by: Ooi, Joyce <[email protected]>
---
.../boot/dts/altera/socfpga_stratix10_socdk.dts | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts b/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts
index 0007564..8785f78 100644
--- a/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts
+++ b/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts
@@ -79,7 +79,7 @@
rxd2-skew-ps = <420>; /* 0ps */
rxd3-skew-ps = <420>; /* 0ps */
txen-skew-ps = <0>; /* -420ps */
- txc-skew-ps = <1860>; /* 960ps */
+ txc-skew-ps = <900>; /* 0ps */
rxdv-skew-ps = <420>; /* 0ps */
rxc-skew-ps = <1680>; /* 780ps */
};
--
1.7.1

2018-04-24 15:16:03

by Dinh Nguyen

Subject: Re: [PATCH] arm64: dts: stratix10: Change pad skew values for EMAC0 PHY driver

On 04/23/2018 10:01 PM, Ooi, Joyce wrote:
> The HPS EMAC0 drive strength is changed to 4mA because the initial 8mA
> drive strength has caused CE test to fail. This requires changes on the
> pad skew for EMAC0 PHY driver. Based on several measurements done, Tx
> clock does not require the extra 0.96ns delay.
>
> Signed-off-by: Ooi, Joyce <[email protected]>
> ---
> .../boot/dts/altera/socfpga_stratix10_socdk.dts | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts b/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts
> index 0007564..8785f78 100644
> --- a/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts
> +++ b/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts
> @@ -79,7 +79,7 @@
> rxd2-skew-ps = <420>; /* 0ps */
> rxd3-skew-ps = <420>; /* 0ps */
> txen-skew-ps = <0>; /* -420ps */
> - txc-skew-ps = <1860>; /* 960ps */
> + txc-skew-ps = <900>; /* 0ps */
> rxdv-skew-ps = <420>; /* 0ps */
> rxc-skew-ps = <1680>; /* 780ps */
> };
>

Applied, thanks!

Dinh