From: Jeffrey Hugo <jhugo@codeaurora.org>
To: Loic Poulain <loic.poulain@linaro.org>,
andy.gross@linaro.org, david.brown@linaro.org,
robh+dt@kernel.org
Cc: linux-arm-msm@vger.kernel.org, bjorn.andersson@linaro.org,
devicetree@vger.kernel.org
Subject: Re: [PATCH] arm64: dts: apq8096-db820c: Increase load on l21 for SDCARD
Date: Wed, 12 Dec 2018 10:23:30 -0700 [thread overview]
Message-ID: <8c92dc30-cfbe-00e2-ae70-243455549ecd@codeaurora.org> (raw)
In-Reply-To: <1544634806-1037-1-git-send-email-loic.poulain@linaro.org>
On 12/12/2018 10:13 AM, Loic Poulain wrote:
> In the same way as for msm8974-hammerhead, l21 load, used for SDCARD
> VMMC, needs to be increased in order to prevent any voltage drop issues
> (due to limited current) happening with some SDCARDS or during specific
> operations (e.g. write).
>
> Fixes: 660a9763c6a9 (arm64: dts: qcom: db820c: Add pm8994 regulator node)
> Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
> ---
> arch/arm64/boot/dts/qcom/apq8096-db820c.dtsi | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/apq8096-db820c.dtsi b/arch/arm64/boot/dts/qcom/apq8096-db820c.dtsi
> index 104cad9..c15e2c0 100644
> --- a/arch/arm64/boot/dts/qcom/apq8096-db820c.dtsi
> +++ b/arch/arm64/boot/dts/qcom/apq8096-db820c.dtsi
> @@ -634,6 +634,8 @@
> l21 {
> regulator-min-microvolt = <2950000>;
> regulator-max-microvolt = <2950000>;
> + regulator-allow-set-load;
> + regulator-system-load = <200000>;
> };
> l22 {
> regulator-min-microvolt = <3300000>;
>
I'm curious, why not update sdhci-msm to set the load on the regulator?
--
Jeffrey Hugo
Qualcomm Datacenter Technologies as an affiliate of Qualcomm
Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.
next prev parent reply other threads:[~2018-12-12 17:23 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-12 17:13 [PATCH] arm64: dts: apq8096-db820c: Increase load on l21 for SDCARD Loic Poulain
2018-12-12 17:23 ` Jeffrey Hugo [this message]
2018-12-13 7:55 ` Loic Poulain
2018-12-13 14:46 ` Jeffrey Hugo
2018-12-13 19:14 ` Doug Anderson
2018-12-12 19:46 ` Bjorn Andersson
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=8c92dc30-cfbe-00e2-ae70-243455549ecd@codeaurora.org \
--to=jhugo@codeaurora.org \
--cc=andy.gross@linaro.org \
--cc=bjorn.andersson@linaro.org \
--cc=david.brown@linaro.org \
--cc=devicetree@vger.kernel.org \
--cc=linux-arm-msm@vger.kernel.org \
--cc=loic.poulain@linaro.org \
--cc=robh+dt@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox