linux-kernel - Re: [PATCH] mmc: tegra: Add Runtime PM callbacks

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Message-ID: <b0c41edb-e9cc-2c36-be21-e52e80577c97@nvidia.com>
Date:   Tue, 28 Jul 2020 15:12:21 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Aniruddha Rao <anrao@...dia.com>, <adrian.hunter@...el.com>,
        <ulf.hansson@...aro.org>, <thierry.reding@...il.com>,
        <p.zabel@...gutronix.de>
CC:     <linux-mmc@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mmc: tegra: Add Runtime PM callbacks


On 27/07/2020 13:47, Aniruddha Rao wrote:
> Add runtime suspend/resume callbacks to save power
> when the bus is not in use.
> In runtime suspend
> - Turn off the SDMMC host CAR clock.
> - Turn off the trimmer/DLL circuit(BG) power supply(VREG).
> - Turn off the SDMMC host internal clocks.
> 
> Re-enable all the disabled clocks/regulators in runtime resume.
> 
> Signed-off-by: Aniruddha Rao <anrao@...dia.com>


This patch is causing a boot regression on Tegra20 Ventana. Other boards
appear to be booting fine, but this is breaking something for Tegra20.
The bootlogs don't appear to show any particular crash, but I see a hang
when initialising the sdhci controllers.

Cheers
Jon

-- 
nvpublic