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Date:   Wed, 4 Jul 2018 09:44:35 +0200
From:   Maxime Ripard <maxime.ripard@bootlin.com>
To:     Stefan Mavrodiev <stefan@olimex.com>
Cc:     Ulf Hansson <ulf.hansson@linaro.org>, Chen-Yu Tsai <wens@csie.org>,
        "open list:MULTIMEDIA CARD (MMC), SECURE DIGITAL (SD) AND..." 
        <linux-mmc@vger.kernel.org>,
        "moderated list:ARM/Allwinner sunXi SoC support" 
        <linux-arm-kernel@lists.infradead.org>,
        open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 1/1] mmc: sunxi: Disable irq during pm_suspend
Message-ID: <20180704074435.46aqhuthrn2vok5x@flea>
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On Wed, Jul 04, 2018 at 09:28:59AM +0300, Stefan Mavrodiev wrote:
> When mmc host controller enters suspend state, the clocks are
> disabled, but irqs are not. For some reason the irqchip emits
> false interrupts, which causes system lock loop.
>=20
> Debug log is:
>   ...
>   sunxi-mmc 1c11000.mmc: setting clk to 52000000, rounded 51200000
>   sunxi-mmc 1c11000.mmc: enabling the clock
>   sunxi-mmc 1c11000.mmc: cmd 13(8000014d) arg 10000 ie 0x0000bbc6 len 0
>   sunxi-mmc 1c11000.mmc: irq: rq (ptrval) mi 00000004 idi 00000000
>   sunxi-mmc 1c11000.mmc: cmd 6(80000146) arg 3210101 ie 0x0000bbc6 len 0
>   sunxi-mmc 1c11000.mmc: irq: rq (ptrval) mi 00000004 idi 00000000
>   sunxi-mmc 1c11000.mmc: cmd 13(8000014d) arg 10000 ie 0x0000bbc6 len 0
>   sunxi-mmc 1c11000.mmc: irq: rq (ptrval) mi 00000004 idi 00000000
>   mmc1: new DDR MMC card at address 0001
>   mmcblk1: mmc1:0001 AGND3R 14.6 GiB
>   mmcblk1boot0: mmc1:0001 AGND3R partition 1 4.00 MiB
>   mmcblk1boot1: mmc1:0001 AGND3R partition 2 4.00 MiB
>   sunxi-mmc 1c11000.mmc: cmd 18(80003352) arg 0 ie 0x0000fbc2 len 409
>   sunxi-mmc 1c11000.mmc: irq: rq (ptrval) mi 00004000 idi 00000002
>    mmcblk1: p1
>   sunxi-mmc 1c11000.mmc: irq: rq   (null) mi 00000000 idi 00000000
>   sunxi-mmc 1c11000.mmc: irq: rq   (null) mi 00000000 idi 00000000
>   sunxi-mmc 1c11000.mmc: irq: rq   (null) mi 00000000 idi 00000000
>   sunxi-mmc 1c11000.mmc: irq: rq   (null) mi 00000000 idi 00000000
> and so on...
>=20
> This issue apears on eMMC cards, routed on MMC2 slot. The patch is
> tested with A20-OLinuXino-MICRO/LIME/LIME2 boards.
>=20
> Fixes: 9a8e1e8cc2c0 ("mmc: sunxi: Add runtime_pm support")
> Signed-off-by: Stefan Mavrodiev <stefan@olimex.com>

Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>

Thanks!
Maxime

--=20
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

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