drivers/crypto/fsl: disable RNG oscillator maximum frequency check
authorAlex Porosanu <alexandru.porosanu@freescale.com>
Tue, 5 May 2015 13:48:33 +0000 (16:48 +0300)
committerYork Sun <yorksun@freescale.com>
Mon, 3 Aug 2015 19:06:37 +0000 (12:06 -0700)
commit026a3f1b7ca487bbce632060b8ca9193bb9edf87
tree3eff7e0b6200dd497776017fdd1f726898d73047
parent6a17365b658b1e5b1d33da0e77722d8a3d7da8d6
drivers/crypto/fsl: disable RNG oscillator maximum frequency check

The rtfrqmax & rtfrqmin set the bounds of the expected frequency of the
oscillator, when SEC runs at its maximum frequency. For certain platforms
(f.i. T2080), the oscillator is very fast and thus if the SEC runs at
a lower than normal frequency, the ring oscillator is incorrectly detected
as being out of bounds.

This patch effectively disables the maximum frequency check, by setting a
high enough maximum allowable frequency for the oscillator. The reasoning
behind this is that usually a broken oscillator will run too slow
(i.e. not run at all) rather than run too fast.

Signed-off-by: Alex Porosanu <alexandru.porosanu@freescale.com>
Acked-by: Ruchika Gupta<ruchika.gupta@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
drivers/crypto/fsl/jr.c
include/fsl_sec.h