mmc: dw_mmc: Avoid accessing registers in runtime suspended state

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cat /sys/kernel/debug/mmc0/regs will hang up the system since
it's in runtime suspended state, so the genpd and biu_clk is
off. This patch fixes this problem by calling pm_runtime_get_sync
to wake it up before reading the registers.

Fixes: e9ed8835e9 ("mmc: dw_mmc: add runtime PM callback")
Cc: <stable@vger.kernel.org>
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

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Shawn Lin 2018-02-23 16:47:25 +08:00 • committed by Ulf Hansson

parent 0d84b9e563

commit 5b43df8b4c

1 changed files with 4 additions and 0 deletions

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drivers/mmc/host/dw_mmc.c

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