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27 March 2024, 02:37:15 UTC
Revision c9b75d51c940c25587a2ad72ec7ec60490abfb6c authored by Heiko Stübner on 11 January 2015, 22:09:23 UTC, committed by Olof Johansson on 17 January 2015, 03:10:39 UTC 
ARM: rockchip: disable jtag/sdmmc autoswitching on rk3288
 
rk3288 SoCs have a function to automatically switch between jtag/sdmmc pinmux
settings depending on the card state. This collides with a lot of assumptions.

It only works when using the internal card-detect mechanism and breaks
horribly when using either the normal card-detect via the slot-gpio function
or via any other pin. Also there is of course no link between the mmc and jtag
on the software-side, so the jtag clocks may very well be disabled when the
card is ejected and the soc switches back to the jtag pinmux.

Leaving the switching function enabled did result in mmc timeouts and rcu
stalls thus hanging the system on 3.19-rc1. Therefore disable it in all cases,
as we expect the devicetree to explicitly select either mmc or jtag pinmuxes
anyway.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Olof Johansson <olof@lixom.net>
1 parent 1dbb36b
History
Tip revision: c9b75d51c940c25587a2ad72ec7ec60490abfb6c authored by Heiko Stübner on 11 January 2015, 22:09:23 UTC
ARM: rockchip: disable jtag/sdmmc autoswitching on rk3288
Tip revision: c9b75d5
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