cleanup linux cpuinfo code

sonynwz: quirk for cpufreq broken driver

There was some redundancy between frequency_linux(cpu, true) and
current_scaling_frequency(), also I see no reason to compile the cpuinfo stuff
unconditionally and the scaling info only on DX since it was already printed
some partial scaling info anyway. Thus compile all the code unconditionally
and simplify the logic in the debug menu. Also avoid putting buffers of size
PATH_MAX on stack since it can be quite big and we only requires 64 bytes
for those paths.

On Sony NWZ, the cpu driver reports frequency in MHz instead of kHz thus we need
to make the cpuinfo code aware of that bug.

Change-Id: I61af45ab5f179ecc909b4841b9137a915a60193a

1 files changed, 5 insertions, 3 deletions

diff --git a/firmware/target/hosted/cpuinfo-linux.h b/firmware/target/hosted/cpuinfo-linux.h
index 0483a3a9aa..defbf2f374 100644
--- a/firmware/target/hosted/cpuinfo-linux.h
+++ b/firmware/target/hosted/cpuinfo-linux.h
@@ -39,9 +39,12 @@ struct time_state {
 };
 
 int cpuusage_linux(struct cpuusage* u);
-int frequency_linux(int cpu, bool scaling);
+/* Return the frequency of a CPU. Note that whenever CPU frequency scaling is supported by the
+ * driver, this frequency may not be accurate and may vaguely reflect the cpu mode. Use
+ * current_scaling_frequency() to get the actual frequency if scaling is supported.
+ * Return -1 on error. */
+int frequency_linux(int cpu);
 
-#if defined(DX50) || defined(DX90)
 /*
     Get the current cpufreq scaling governor.
     cpu [in]: The number of the cpu to query.
@@ -60,7 +63,6 @@ bool current_scaling_governor(int cpu, char* governor, int governor_size);
 int min_scaling_frequency(int cpu);
 int current_scaling_frequency(int cpu);
 int max_scaling_frequency(int cpu);
-#endif
 
 int cpustatetimes_linux(int cpu, struct time_state* data, int max_elements);
 int cpucount_linux(void);