linux-kernel - Re: [PATCH 1/3] arm64: dts: ti: k3-am62-main: Update OTAP and ITAP delay select

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Date:   Tue, 20 Dec 2022 16:49:31 +0530
From:   Vignesh Raghavendra <vigneshr@...com>
To:     Sjoerd Simons <sjoerd@...labora.com>, Nishanth Menon <nm@...com>
CC:     <martyn.welch@...labora.com>, Nitin Yadav <n-yadav@...com>,
        "Aswath Govindraju" <a-govindraju@...com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        "Tero Kristo" <kristo@...nel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] arm64: dts: ti: k3-am62-main: Update OTAP and ITAP
 delay select



On 16/12/22 8:06 pm, Sjoerd Simons wrote:
> From: Nitin Yadav <n-yadav@...com>
> 
> UHS Class U1 sd-card are not getting detected due to incorrect
> OTAP/ITAP delay select values in linux. Update OTAP and ITAP
> delay select values for various speed modes. For sdhci0, update
> OTAP delay values for ddr52 & HS200 and add ITAP delay for legacy
> & mmc-hs. For sdhci1 & sdhci2, update OTAP & ITAP delay select
> recommended as in RIOT for various speed modes.
> 
> Signed-off-by: Nitin Yadav <n-yadav@...com>
> [cherry-pick from vendor BSP]
> Signed-off-by: Sjoerd Simons <sjoerd@...labora.com>
> ---
> 
>  arch/arm64/boot/dts/ti/k3-am62-main.dtsi | 46 ++++++++++++------------
>  1 file changed, 24 insertions(+), 22 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-am62-main.dtsi b/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
> index 03660476364f..28c250a8d1ec 100644
> --- a/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
> @@ -391,8 +391,10 @@ sdhci0: mmc@...0000 {
>  		ti,clkbuf-sel = <0x7>;
>  		ti,otap-del-sel-legacy = <0x0>;
>  		ti,otap-del-sel-mmc-hs = <0x0>;
> -		ti,otap-del-sel-ddr52 = <0x9>;
> -		ti,otap-del-sel-hs200 = <0x6>;
> +		ti,otap-del-sel-ddr52 = <0x5>;
> +		ti,otap-del-sel-hs200 = <0x5>;
> +		ti,itap-del-sel-legacy = <0xa>;

This is pretty useless without corresponding driver changes 
to pick up ti,itap-del-sel-legacy as well

https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/commit/drivers/mmc/host/sdhci_am654.c?h=ti-linux-5.10.y&id=93d22fc56007ee13e589debf0d32c8b1d5fdc6d8
https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/commit/drivers/mmc/host/sdhci_am654.c?h=ti-linux-5.10.y&id=9c878c3dc642f7f1f3ab6ca7f812cd43fe7ed7d8

Could you list that cards affected and fixed by this change?

Regards
Vignesh

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