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

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Message-ID: <8411f1c0-29e4-cba3-6cce-8b343d40d8aa@ti.com>
Date:   Wed, 21 Dec 2022 20:20:44 +0530
From:   "Raghavendra, Vignesh" <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 12/20/2022 6:37 PM, Sjoerd Simons wrote:
> Hey Vignesh
> 
> On Tue, 2022-12-20 at 16:49 +0530, Vignesh Raghavendra wrote:
>>
>>
>> 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
> 
> Right; itap-del-sel-legacy is properly documented in the device-tree
> binding and was already previously set ofcourse so i didn't pick up it
> needed more driver changes. That said the dtb change itself should
> still be valid even if not actually applied.
> 
>> 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?
> 
> It's a Collabora branded UHS class 1 (SDR104) card; Matching the commit
> message indication given by Nitin. So that in particular i guess, will
> have been fixed by the change to the ti,otap-del-sel-sdr104 value for
> sdhci1.
> 
> For the two patches you highlighted above; Is TI planning to upstream
> those as well? 
>

Yes, the plan is to post those patches to mmc list post 6.2-rc1

Regards
Vignesh