linux-kernel - Re: sdhci-esdhc-imx/v5.0-rc5: i.MX50 system hangs when "per" clock is disabled

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Message-ID: <20190210213221.GC2061@latitude>
Date:   Sun, 10 Feb 2019 22:32:21 +0100
From:   Jonathan Neuschäfer <j.neuschaefer@....net>
To:     Jonathan Neuschäfer <j.neuschaefer@....net>
Cc:     linux-clk@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        NXP Linux Team <linux-imx@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: sdhci-esdhc-imx/v5.0-rc5: i.MX50 system hangs when "per" clock
 is disabled

On Thu, Feb 07, 2019 at 11:52:11PM +0100, Jonathan Neuschäfer wrote:
> However, as soon as the mmc driver (sdhci-esdhc-imx.c) disables clk_per
> in sdhci_esdhc_runtime_suspend[2], the whole system locks up in some way.

I've traced clk prepare/unprepare/enable/disable calls and got this
right before it hangs:

[    1.280981] sdhci_esdhc_runtime_suspend: unprepare clk_per
[    1.283356] clk_core_unprepare esdhc1_per_gate
[    1.285191] clk_core_unprepare esdhc_a_podf
[    1.286881] clk_core_unprepare esdhc_a_pred
[    1.288568] clk_core_unprepare esdhc_a_sel
[    1.290220] clk_core_unprepare pll2_sw

I suspect that there is a dependency on pll2_sw that is not represented
in the imx5 clock driver. I'm comparing it to the Reference Manual now.


Thanks,
Jonathan Neuschäfer

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