linux-kernel - Re: [PATCH] ARM: dts: qcom: msm8974-hammerhead: increase load on l20 for sdhci

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Message-ID: <20180731222928.GA24465@builder>
Date:   Tue, 31 Jul 2018 15:29:28 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Bhushan Shah <bshah@....org>
Cc:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Brian Masney <masneyb@...tation.org>
Subject: Re: [PATCH] ARM: dts: qcom: msm8974-hammerhead: increase load on l20
 for sdhci

On Mon 09 Jul 02:16 PDT 2018, Bhushan Shah wrote:

> The kernel would not boot on the hammerhead hardware due to the
> following error:
> 
> mmc0: Timeout waiting for hardware interrupt.
> mmc0: sdhci: ============ SDHCI REGISTER DUMP ===========
> mmc0: sdhci: Sys addr:  0x00000200 | Version:  0x00003802
> mmc0: sdhci: Blk size:  0x00000200 | Blk cnt:  0x00000200
> mmc0: sdhci: Argument:  0x00000000 | Trn mode: 0x00000023
> mmc0: sdhci: Present:   0x03e80000 | Host ctl: 0x00000034
> mmc0: sdhci: Power:     0x00000001 | Blk gap:  0x00000000
> mmc0: sdhci: Wake-up:   0x00000000 | Clock:    0x00000007
> mmc0: sdhci: Timeout:   0x0000000e | Int stat: 0x00000000
> mmc0: sdhci: Int enab:  0x02ff900b | Sig enab: 0x02ff100b
> mmc0: sdhci: AC12 err:  0x00000000 | Slot int: 0x00000000
> mmc0: sdhci: Caps:      0x642dc8b2 | Caps_1:   0x00008007
> mmc0: sdhci: Cmd:       0x00000c1b | Max curr: 0x00000000
> mmc0: sdhci: Resp[0]:   0x00000c00 | Resp[1]:  0x00000000
> mmc0: sdhci: Resp[2]:   0x00000000 | Resp[3]:  0x00000000
> mmc0: sdhci: Host ctl2: 0x00000008
> mmc0: sdhci: ADMA Err:  0x00000000 | ADMA Ptr: 0x70040220
> mmc0: sdhci: ============================================
> mmc0: Card stuck in wrong state! mmcblk0 card_busy_detect status: 0xe00
> mmc0: cache flush error -110
> mmc0: Reset 0x1 never completed.
> 
> This patch increases the load on l20 to 0.2 amps for the sdhci
> and allows the device to boot normally.
> 
> Signed-off-by: Bhushan Shah <bshah@....org>
> Suggested-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> Tested-by: Brian Masney <masneyb@...tation.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> ---
>  arch/arm/boot/dts/qcom-msm8974-lge-nexus5-hammerhead.dts | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/qcom-msm8974-lge-nexus5-hammerhead.dts b/arch/arm/boot/dts/qcom-msm8974-lge-nexus5-hammerhead.dts
> index 4dc0b347b1ee..c2dc9d09484a 100644
> --- a/arch/arm/boot/dts/qcom-msm8974-lge-nexus5-hammerhead.dts
> +++ b/arch/arm/boot/dts/qcom-msm8974-lge-nexus5-hammerhead.dts
> @@ -189,6 +189,8 @@
>  						regulator-max-microvolt = <2950000>;
>  
>  						regulator-boot-on;
> +						regulator-system-load = <200000>;
> +						regulator-allow-set-load;
>  					};
>  
>  					l21 {
> -- 
> 2.17.1
>