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mmc: dw_mmc: Avoid accessing registers in runtime suspended state
author
Shawn Lin
<shawn.lin@rock-chips.com>
Fri, 23 Feb 2018 08:47:25 +0000
(16:47 +0800)
committer
Greg Kroah-Hartman
<gregkh@linuxfoundation.org>
Fri, 9 Mar 2018 06:41:03 +0000
(22:41 -0800)
commit
5b43df8b4c1a7f0c3fbf793c9566068e6b1e570c
upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/mmc/host/dw_mmc.c
patch
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diff --git
a/drivers/mmc/host/dw_mmc.c
b/drivers/mmc/host/dw_mmc.c
index
4f28067
..
76b8dec
100644
(file)
--- a/
drivers/mmc/host/dw_mmc.c
+++ b/
drivers/mmc/host/dw_mmc.c
@@
-165,6
+165,8
@@
static int dw_mci_regs_show(struct seq_file *s, void *v)
{
struct dw_mci *host = s->private;
+ pm_runtime_get_sync(host->dev);
+
seq_printf(s, "STATUS:\t0x%08x\n", mci_readl(host, STATUS));
seq_printf(s, "RINTSTS:\t0x%08x\n", mci_readl(host, RINTSTS));
seq_printf(s, "CMD:\t0x%08x\n", mci_readl(host, CMD));
@@
-172,6
+174,8
@@
static int dw_mci_regs_show(struct seq_file *s, void *v)
seq_printf(s, "INTMASK:\t0x%08x\n", mci_readl(host, INTMASK));
seq_printf(s, "CLKENA:\t0x%08x\n", mci_readl(host, CLKENA));
+ pm_runtime_put_autosuspend(host->dev);
+
return 0;
}