linux-kernel - Re: [PATCH v2 02/12] dts: mvebu: Update A8K AP806/AP807 SDHCI settings

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Message-ID: <20210211104208.GX1463@shell.armlinux.org.uk>
Date:   Thu, 11 Feb 2021 10:42:08 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     kostap@...vell.com
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, robh+dt@...nel.org,
        sebastian.hesselbarth@...il.com, gregory.clement@...tlin.com,
        andrew@...n.ch, mw@...ihalf.com, jaz@...ihalf.com,
        nadavh@...vell.com, stefanc@...vell.com, bpeled@...vell.com
Subject: Re: [PATCH v2 02/12] dts: mvebu: Update A8K AP806/AP807 SDHCI
 settings

On Wed, Feb 10, 2021 at 04:09:39PM +0200, kostap@...vell.com wrote:
> From: Konstantin Porotchkin <kostap@...vell.com>
> 
> Select the AP SDHCI PHY slow mode for AP806 die only (move it
> from armada-ap80x.dtsi to armada-ap806.dtsi). This will allow
> running AP807 based devices at HS400 speed.
> Remove Ap SDHCI slow mode property from MacchiatoBin board DTS
> since it is already selected on the SoC level.
> 
> Signed-off-by: Konstantin Porotchkin <kostap@...vell.com>

Acked-by: Russell King <rmk+kernel@...linux.org.uk>

> ---
>  arch/arm64/boot/dts/marvell/armada-8040-mcbin.dtsi |  5 -----
>  arch/arm64/boot/dts/marvell/armada-ap806.dtsi      | 12 ++++++++++++
>  arch/arm64/boot/dts/marvell/armada-ap80x.dtsi      |  1 -
>  3 files changed, 12 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/marvell/armada-8040-mcbin.dtsi b/arch/arm64/boot/dts/marvell/armada-8040-mcbin.dtsi
> index 73733b4126e2..69653de998e2 100644
> --- a/arch/arm64/boot/dts/marvell/armada-8040-mcbin.dtsi
> +++ b/arch/arm64/boot/dts/marvell/armada-8040-mcbin.dtsi
> @@ -109,11 +109,6 @@
>  
>  &ap_sdhci0 {
>  	bus-width = <8>;
> -	/*
> -	 * Not stable in HS modes - phy needs "more calibration", so add
> -	 * the "slow-mode" and disable SDR104, SDR50 and DDR50 modes.
> -	 */
> -	marvell,xenon-phy-slow-mode;
>  	no-1-8-v;
>  	no-sd;
>  	no-sdio;
> diff --git a/arch/arm64/boot/dts/marvell/armada-ap806.dtsi b/arch/arm64/boot/dts/marvell/armada-ap806.dtsi
> index 866628679ac7..828cd539173b 100644
> --- a/arch/arm64/boot/dts/marvell/armada-ap806.dtsi
> +++ b/arch/arm64/boot/dts/marvell/armada-ap806.dtsi
> @@ -28,3 +28,15 @@
>  		reg = <0x278 0xa30>;
>  	};
>  };
> +
> +&ap_sdhci0 {
> +	/*
> +	 * SoC based on AP806 revision A0, A1 and A2 should use slow mode
> +	 * settings for Ap SDHCI due to HW Erratum HWE-7296210
> +	 * AP806 revesion B0 and later has this erratum fixed and the slow
> +	 * mode could be removed in board DTS:
> +	 *     /delete-property/marvell,xenon-phy-slow-mode;
> +	 * Starting from B0 revision, the AP SDHCI can run with HS400 timing.
> +	 */
> +	marvell,xenon-phy-slow-mode;
> +};
> diff --git a/arch/arm64/boot/dts/marvell/armada-ap80x.dtsi b/arch/arm64/boot/dts/marvell/armada-ap80x.dtsi
> index 12e477f1aeb9..edd6131a0587 100644
> --- a/arch/arm64/boot/dts/marvell/armada-ap80x.dtsi
> +++ b/arch/arm64/boot/dts/marvell/armada-ap80x.dtsi
> @@ -257,7 +257,6 @@
>  				clock-names = "core";
>  				clocks = <&ap_clk 4>;
>  				dma-coherent;
> -				marvell,xenon-phy-slow-mode;
>  				status = "disabled";
>  			};
>  
> -- 
> 2.17.1
> 
> 

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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