linux-kernel - Re: [PATCH v2 2/2] mmc: sdhci-msm: Enable delay circuit calibration clocks

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Date:   Wed, 20 Sep 2017 15:52:38 -0500
From:   Rob Herring <robh@...nel.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Mark Rutland <mark.rutland@....com>, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Venkat Gopalakrishnan <venkatg@...eaurora.org>,
        Ritesh Harjani <riteshh@...eaurora.org>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v2 2/2] mmc: sdhci-msm: Enable delay circuit calibration
 clocks

On Fri, Sep 15, 2017 at 04:35:24PM -0700, Bjorn Andersson wrote:
> The delay circuit used to support HS400 is calibrated based on two
> additional clocks. When these clocks are not available and
> FF_CLK_SW_RST_DIS is not set in CORE_HC_MODE, reset might fail. But on
> some platforms this doesn't work properly and below dump can be seen in
> the kernel log.
> 
>   mmc0: Reset 0x1 never completed.
>   mmc0: sdhci: ============ SDHCI REGISTER DUMP ===========
>   mmc0: sdhci: Sys addr:  0x00000000 | Version:  0x00001102
>   mmc0: sdhci: Blk size:  0x00004000 | Blk cnt:  0x00000000
>   mmc0: sdhci: Argument:  0x00000000 | Trn mode: 0x00000000
>   mmc0: sdhci: Present:   0x01f80000 | Host ctl: 0x00000000
>   mmc0: sdhci: Power:     0x00000000 | Blk gap:  0x00000000
>   mmc0: sdhci: Wake-up:   0x00000000 | Clock:    0x00000002
>   mmc0: sdhci: Timeout:   0x00000000 | Int stat: 0x00000000
>   mmc0: sdhci: Int enab:  0x00000000 | Sig enab: 0x00000000
>   mmc0: sdhci: AC12 err:  0x00000000 | Slot int: 0x00000000
>   mmc0: sdhci: Caps:      0x742dc8b2 | Caps_1:   0x00008007
>   mmc0: sdhci: Cmd:       0x00000000 | Max curr: 0x00000000
>   mmc0: sdhci: Resp[0]:   0x00000000 | Resp[1]:  0x00000000
>   mmc0: sdhci: Resp[2]:   0x00000000 | Resp[3]:  0x00000000
>   mmc0: sdhci: Host ctl2: 0x00000000
>   mmc0: sdhci: ============================================
> 
> Add support for the additional calibration clocks to allow these
> platforms to be configured appropriately.
> 
> Cc: Venkat Gopalakrishnan <venkatg@...eaurora.org>
> Cc: Ritesh Harjani <riteshh@...eaurora.org>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
> 
> Changes since v1:
> - Add new clocks to DT binding
> 
>  Documentation/devicetree/bindings/mmc/sdhci-msm.txt |  2 ++

Acked-by: Rob Herring <robh@...nel.org>

>  drivers/mmc/host/sdhci-msm.c                        | 12 +++++++++++-
>  2 files changed, 13 insertions(+), 1 deletion(-)