Prima 3.2.3.124
lib: spinlock_debug: Avoid livelock in do_raw_spin_lock

The logic in do_raw_spin_lock attempts to acquire a spinlock
by invoking arch_spin_trylock in a loop with a delay between
each attempt. Now consider the following situation in a 2
CPU system:

1. Cpu 0 continually acquires and releases a spinlock in a
   tight loop; it stays in this loop until some condition X
   is satisfied. X can only be satisfied by another CPU.

2. Cpu 1 tries to acquire the same spinlock, in an attempt
   to satisfy the aforementioned condition X. However, it
   never sees the unlocked value of the lock because the
   debug spinlock code uses trylock instead of just lock;
   it checks at all the wrong moments - whenever Cpu 0 has
   locked the lock.

Now in the absence of debug spinlocks, the architecture specific
spinlock code can correctly allow Cpu1 to wait in a "queue"
(e.g., ticket spinlocks), ensuring that it acquires the lock at
some point. However, with the debug spinlock code, livelock
can easily occur due to the use of try_lock, which obviously
cannot put the CPU in that "queue".

Address this by actually attempting arch_spin_lock once it is
suspected that there is a spinlock lockup. If we're in a
situation that is described above, the arch_spin_lock should
succeed; otherwise other timeout mechanisms (e.g., watchdog)
should alert the system of a lockup.

Additionally, the delay between each trylock attempt adds up
to a total delay of 1 second. On some embedded architectures,
this is an unacceptably large value. Reduce this to a ~62 ms
delay.

CRs-Fixed: 393351
Change-Id: I56f0d8f5e483cd7e8167fc7a363b9de7777a0830
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>
Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>
USB: ci13xxx_udc: Reduce busywait time from 100msec to 25msec

Commit 037476 "lib: spinlock_debug: Avoid livelock in
do_raw_spin_lock" reduced timeout value in spin_try_lock from
1sec to 62msec. Once this timeout happens, system would then
crash detecting spinlock lockup.
USB driver is currently using 100msec as timeout during busywait
loops with spinlock acquired. It may result in above spin lockup
crash whenever timeout happens due to some hardware issue.
Fix this by reducing timeout to 25msec as confirmed by h/w team.

CRs-Fixed: 487591
Change-Id: Idadcbe4b21fea456256586657ef07dfcb578f5c1
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>
Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>