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.
>
> 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...
>
> This issue apears on eMMC cards, routed on MMC2 slot. The patch is
> tested with A20-OLinuXino-MICRO/LIME/LIME2 boards.
>
> Fixes: 9a8e1e8cc2c0 ("mmc: sunxi: Add runtime_pm support")
> Signed-off-by: Stefan Mavrodiev <stefan@xxxxxxxxxx>
Acked-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxx>
Thanks!
Maxime
--
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com
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