linux-kernel - Re: [RFC PATCH 00/13] Add tuning algorithm for delay chain

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Date: Wed, 31 Jan 2024 14:41:31 -0600
From: Judith Mendez <jm@...com>
To: "Raghavendra, Vignesh" <vigneshr@...com>,
        Ulf Hansson
	<ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof
 Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley
	<conor+dt@...nel.org>
CC: Adrian Hunter <adrian.hunter@...el.com>, <linux-mmc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Nishanth Menon <nm@...com>,
        Andrew Davis
	<afd@...com>, Udit Kumar <u-kumar1@...com>,
        Roger Quadros
	<rogerq@...nel.org>, <devicetree@...r.kernel.org>,
        Randolph Sapp <rs@...com>
Subject: Re: [RFC PATCH 00/13] Add tuning algorithm for delay chain

On 1/31/24 7:35 AM, Raghavendra, Vignesh wrote:
> Hi,
> 
> On 1/31/2024 6:07 AM, Judith Mendez wrote:
>> This patch series introduces a new tuning algorithm for
>> mmc. The new algorithm should be used when delay chain is
>> enabled. The ITAPDLY is selected from the largest passing
>> window and the buffer is not viewed as a circular buffer.
>> The new tuning algorithm is implemented as per the paper
>> published here [0] and has been tested on the following
>> platforms: AM62x SK, AM62A SK, AM62p SK, AM64x SK, and AM64x
>> EVM.
>>
>> The series also includes a few fixes in the sdhci_am654
>> driver on OTAPDLYEN/ITAPDLYEN and ITAPDELSEL. There are
>> also device tree node fixes for missing mmc nodes,
>> modifying DLL properties, and fixes for OTAP/ITAP delay
>> values.
>>
>> MMC0/MMC2 nodes are introduced for AM62ax in this series.
>>
>> This series is sent as a RFC mostly to get some feedback
>> and/or comments on the new tuning algorithm implementation.
>>
>> [0] https://www.ti.com/lit/an/spract9/spract9.pdf
>>
> 
> 
>> Judith Mendez (11):
>>    drivers: mmc: host: sdhci_am654: Add tuning algorithm for delay chain
>>    drivers: mmc: host: sdhci_am654: Write ITAPDLY for DDR52 timing
>>    drivers: mmc: host: sdhci_am654: Add missing OTAP/ITAP enable
>>    drivers: mmc: host: sdhci_am654: Add ITAPDLYSEL in
>>      sdhci_j721e_4bit_set_clock
>>    drivers: mmc: host: sdhci_am654: Fix ITAPDLY for HS400 timing
> 
> These patches needs to have Fixes: tag as they are bug fixes IMO.

Understood, will add.

> 
>>    arm64: dts: ti: k3-am62a-main: Add sdhci2 instance
>>    arm64: dts: ti: k3-am64-main: Update ITAP/OTAP values for MMC
>>    arm64: dts: ti: k3-am62-main: Update ITAP/OTAP values for MMC
>>    arm64: dts: ti: k3-am62p: Add missing properties for MMC
>>    arm64: dts: ti: k3-am6*: Remove DLL properties for soft phys
>>    arm64: dts: ti: k3-am6*: Reorganize MMC properties
>>
>> Nitin Yadav (2):
>>    arm64: dts: ti: k3-am62a-main: Add sdhci0 instance
>>    arm64: dts: ti: k3-am62a7-sk: Enable eMMC support
>>
> 
> Can the driver changes be merged independent of DT changes? Or are they
> meant to go together? Latter would be problematic as it creates cross
> tree dependencies.

The driver changes can be merged independently.

> 
>>   arch/arm64/boot/dts/ti/k3-am62-main.dtsi      |  57 +++--
>>   .../arm64/boot/dts/ti/k3-am625-beagleplay.dts |   5 -
>>   arch/arm64/boot/dts/ti/k3-am62a-main.dtsi     |  45 +++-
>>   arch/arm64/boot/dts/ti/k3-am62a7-sk.dts       |  27 ++-
>>   arch/arm64/boot/dts/ti/k3-am62p-main.dtsi     |  44 +++-
>>   arch/arm64/boot/dts/ti/k3-am62p5-sk.dts       |   7 +-
>>   .../arm64/boot/dts/ti/k3-am62x-sk-common.dtsi |   4 +-
>>   arch/arm64/boot/dts/ti/k3-am64-main.dtsi      |  17 +-
>>   arch/arm64/boot/dts/ti/k3-am642-evm.dts       |   4 +-
>>   arch/arm64/boot/dts/ti/k3-am642-sk.dts        |   2 -
>>   drivers/mmc/host/sdhci_am654.c                | 215 ++++++++++++++----
>>   11 files changed, 321 insertions(+), 106 deletions(-)
>>