linux-kernel - Re: [PATCH V5 0/2] Re-initialize DLL when MCLK is gated dynamically

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Date:   Tue, 20 Nov 2018 10:29:52 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Rob Herring <robh+dt@...nel.org>,
        Evan Green <evgreen@...omium.org>,
        Doug Anderson <dianders@...gle.com>,
        Asutosh Das <asutoshd@...eaurora.org>,
        Harjani Ritesh <riteshh@...eaurora.org>,
        Sahitya Tummala <stummala@...eaurora.org>,
        Sayali Lokhande <sayalil@...eaurora.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>
Subject: Re: [PATCH V5 0/2] Re-initialize DLL when MCLK is gated dynamically

On 12 November 2018 at 07:52, Veerabhadrarao Badiganti
<vbadigan@...eaurora.org> wrote:
> On few SDHCI-MSM controllers, the host controller's clock tuning
> circuit may go out of sync if controller clocks are gated which
> eventually, result in data CRC and command CRC/timeout errors.
> To fix this issue, the DLL needs to be re-initialized and restored with
> its old settings once clocks are ungated. SDHC cotroller on SDM845 SOC
> has this limitation.
>
> Changes since V4:
>         - Exactly same as V3, posted multiple mails for V4.
>         So to avoid confusion updating it as V5.
>
> Changes since V3:
>         - Introduced SoC specific dt compatible string for sdhci-msm
>         controller
>         - Moved the condition which checks whether tuning is needed or
>         not, to a common function.
>
> Changes since V2:
>         - Removed an unused variable.
>         - Renamed the newly introduced flags to be more meaningful.
>         - Added new dt compatible string for SDM845 SOC.
>
> Changes since V1:
>         - Replaced dt flag with a dt compatible string to
>         indicate SHDCI-MSM controller varients which need this fix.
>         - Moved the DLL settings restoration logic from request
>         context to platform driver runtime pm context.
>
> Tested on: sdm845
> Veerabhadrarao Badiganti (2):
>   dt-bindings: mmc: sdhci-msm: Add SoC-specific compatible strings
>   mmc: sdhci-msm: Re-initialize DLL if MCLK is gated dynamically
>
>  .../devicetree/bindings/mmc/sdhci-msm.txt          | 21 ++++--
>  drivers/mmc/host/sdhci-msm.c                       | 78 +++++++++++++++++++---
>  2 files changed, 84 insertions(+), 15 deletions(-)

Applied for next, thanks!

Kind regards
Uffe