[BUG] broken mixer after second resume from mem

From	Tomeu Vizoso <tomeu.vizoso@collabora.com>
Newsgroups	linux.kernel
Subject	[BUG] broken mixer after second resume from mem
Date	2015-10-13 12:30 +0200
Message-ID	<qj50d-3He-15@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Hi,

have been hunting down a bug on exynos5250-snow which caused both HDMI
and LVDS output to be broken after the second resume (with suspend to
mem, but not to idle).

What I have found is that when powering down the DISP1 power domain
while suspending for the second time, the contents of the SRC_TOP3
register change from 0x1110550 to 0x1110500. IIUIC, this means that
ACLK_200_DISP1 is reparented to XXTI.

When the CPU comes up again, that register contains 0x1110550 again, but
it's set to 0x1110500 by the code that restores clk registers when resuming:

First suspend:

exynos_pd_power: SRC_TOP3 1110550 disp1-power-domain@100440A0 - before
exynos_pd_power: SRC_TOP3 1110550 disp1-power-domain@100440A0 - after
exynos5250_clk_suspend: SRC_TOP3 1110550
exynos5250_clk_resume: SRC_TOP3 1110550 - before
exynos5250_clk_resume: SRC_TOP3 1110550 - after
exynos_pd_power: SRC_TOP3 1110550 disp1-power-domain@100440A0 - before
exynos_pd_power: SRC_TOP3 1110550 disp1-power-domain@100440A0 - after


Second suspend:

exynos_pd_power: SRC_TOP3 1110550 disp1-power-domain@100440A0 - before
exynos_pd_power: SRC_TOP3 1110500 disp1-power-domain@100440A0 - after
exynos5250_clk_suspend: SRC_TOP3 1110500
exynos5250_clk_resume: SRC_TOP3 1110550 - before
exynos5250_clk_resume: SRC_TOP3 1110500 - after
exynos_pd_power: SRC_TOP3 1110500 disp1-power-domain@100440A0 - before
exynos_pd_power: SRC_TOP3 1110500 disp1-power-domain@100440A0 - after


I have no idea of why it happens on the second suspend, and also don't
know why it doesn't happen when suspending to idle.

Any ideas?

Thanks,

Tomeu
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Thread

[BUG] broken mixer after second resume from mem Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-10-13 12:30 +0200
  Re: [BUG] broken mixer after second resume from mem Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2015-10-14 08:00 +0200
    Re: [BUG] broken mixer after second resume from mem Tomeu Vizoso <tomeu.vizoso@collabora.com> - 2015-10-14 09:00 +0200
      Re: [BUG] broken mixer after second resume from mem Krzysztof Kozlowski <k.kozlowski@samsung.com> - 2015-10-15 01:40 +0200

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