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| /linux/drivers/mmc/host/ |
| H A D | dw_mmc.c | diff 5b43df8b4c1a7f0c3fbf793c9566068e6b1e570c Fri Feb 23 09:47:25 CET 2018 Shawn Lin <shawn.lin@rock-chips.com> mmc: dw_mmc: Avoid accessing registers in runtime suspended state
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: e9ed8835e990 ("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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