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| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2020-02-11 21:18:55 +0300 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2020-02-22 04:25:42 +0300 |
| commit | 30332eeefec8f83afcea00c360f99ef64b87f220 (patch) | |
| tree | f1d07f6fe23cb002d66933b9cc35e3c626d03db6 /include/linux/debugfs.h | |
| parent | 9e00df7156e45e42c695ffc596b4bf1328d00516 (diff) | |
| download | linux-30332eeefec8f83afcea00c360f99ef64b87f220.tar.xz | |
debugfs: regset32: Add Runtime PM support
Hardware registers of devices under control of power management cannot
be accessed at all times. If such a device is suspended, register
accesses may lead to undefined behavior, like reading bogus values, or
causing exceptions or system lock-ups.
Extend struct debugfs_regset32 with an optional field to let device
drivers specify the device the registers in the set belong to. This
allows debugfs_show_regset32() to make sure the device is resumed while
its registers are being read.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'include/linux/debugfs.h')
| -rw-r--r-- | include/linux/debugfs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h index 3d013de64f70..ad416853e722 100644 --- a/include/linux/debugfs.h +++ b/include/linux/debugfs.h @@ -35,6 +35,7 @@ struct debugfs_regset32 { const struct debugfs_reg32 *regs; int nregs; void __iomem *base; + struct device *dev; /* Optional device for Runtime PM */ }; extern struct dentry *arch_debugfs_dir; |