[PATCH v4] drm/i915/slpc: Add sysfs for SLPC power profiles

[Rodrigo Vivi]

On Sat, Jan 18, 2025 at 06:47:27PM +0100, Michal Wajdeczko wrote:
> 
> 
> On 17.01.2025 22:57, Vinay Belgaumkar wrote:
> > Default SLPC power profile is Base(0). Power Saving mode(1)
> > has conservative up/down thresholds and is suitable for use with
> > apps that typically need to be power efficient.
> > 
> > Selected power profile will be displayed in this format-
> > 
> > $ cat slpc_power_profile
> > 
> >   [base]    power_saving
> > 
> > $ echo power_saving > slpc_power_profile
> > $ cat slpc_power_profile
> > 
> >   base    [power_saving]
> > 
> 
> is that output aligned with the sysfs rules? from [1]

Please help me to understand why that is against the rule?

It is still ascii and it is one value per file.

How is this different from:

$ cat /sys/power/mem_sleep
[s2idle] shallow deep

?!

> 
> "Attributes should be ASCII text files, preferably with only one value
> per file. It is noted that it may not be efficient to contain only one
> value per file, so it is socially acceptable to express an array of
> values of the same type.
> 
> Mixing types, expressing multiple lines of data, and doing fancy
> formatting of data is heavily frowned upon. Doing these things may get
> you publicly humiliated and your code rewritten without not"
> 
> 
> [1] https://www.kernel.org/doc/html/latest/filesystems/sysfs.html#attributes
>