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