OMAP4 errata i740

[Tomi Valkeinen <tomi.valkeinen@ti.com>]

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Hi,

I just found out about OMAP4 errata i740:

DESCRIPTION
A bug has been identified in the interconnect agent handling the connect-disconnect protocol between an
initiator and interconnect. When the disconnect protocol violation occurs, there is a dead lock and a
system lockup is observed.

The issue can occur in a corner case when the impacted module has started a transition to standby, for
the L3 initiator on which it is attached, exactly at the time the initiator gets an event for exiting idle state.
Such a situation can occur when the impacted initiator is generating short MStandby pulses (pulse
durations less than one L4 clock cycle).

DSS and ISS are the only initiators that are impacted.

WORKAROUND
L3_CLK1 must be kept in NO-IDLE when the DSS clock domain is ON. It can be switched back to
HW_AUTO when the DSS clock domain is IDLE.

L3_CLK2 must be kept in NO-IDLE when the ISS clock domain is ON. It can be switched back to
HW_AUTO when the ISS clock domain is IDLE.


All OMAP4 versions seem to be affected. I couldn't find a mention about
this in the mainline kernel. Any ideas how and where this should be
fixed?

 Tomi


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