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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: 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>
This commit is contained in:
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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4
drivers/mmc/host/dw_mmc.c
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@ -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;
}