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From: "Jonathan Neuschäfer" <j.neuschaefer@gmx.net>
To: "Jonathan Neuschäfer" <j.neuschaefer@gmx.net>
Cc: linux-clk@vger.kernel.org, linux-mmc@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	Shawn Guo <shawnguo@kernel.org>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Fabio Estevam <fabio.estevam@nxp.com>,
	NXP Linux Team <linux-imx@nxp.com>,
	Michael Turquette <mturquette@baylibre.com>,
	Stephen Boyd <sboyd@kernel.org>,
	Adrian Hunter <adrian.hunter@intel.com>,
	Ulf Hansson <ulf.hansson@linaro.org>
Subject: Re: sdhci-esdhc-imx/v5.0-rc5: i.MX50 system hangs when "per" clock is disabled
Date: Sun, 10 Feb 2019 22:32:21 +0100	[thread overview]
Message-ID: <20190210213221.GC2061@latitude> (raw)
In-Reply-To: <20190207225211.GA17552@latitude>

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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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      parent reply	other threads:[~2019-02-10 21:32 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-07 22:52 sdhci-esdhc-imx/v5.0-rc5: i.MX50 system hangs when "per" clock is disabled Jonathan Neuschäfer
2019-02-08  0:50 ` Fabio Estevam
2019-02-09 16:24   ` Jonathan Neuschäfer
2019-02-09 17:15     ` Fabio Estevam
2019-02-10 21:32 ` Jonathan Neuschäfer [this message]

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