Paul Walmsley <paul@xxxxxxxxx> writes: > On Tue, 18 Sep 2012, Paul Walmsley wrote: > >> What do you think about the following patch to handle part of the i582 >> workaround? > > That patch was an older version; here's one that builds and boots - sorry > about that. It passed the basic PM tests here on 3730ES1.0 Beagle XM and > 3730ES1.2 EVM. > > Kevin, care to ack it if you're happy with it? We still need to get the > other parts of the i582 workaround into place, of course... > > > - Paul > > From: Paul Walmsley <paul@xxxxxxxxx> > Date: Tue, 18 Sep 2012 16:02:38 -0600 > Subject: [PATCH] ARM: OMAP36xx: PM: apply part of the erratum i582 workaround > > On OMAP36xx chips with ES < 1.2, if the PER powerdomain goes to OSWR > or OFF while CORE stays at CSWR or ON, or if, upon chip wakeup from > OSWR or OFF, the CORE powerdomain goes ON before PER, the UART3/4 > FIFOs and McBSP2/3 SIDETONE memories will be unusable. This is > erratum i582 in the OMAP36xx Silicon Errata document. > > This patch implements one of several parts of the workaround: the > addition of the wakeup dependency between the PER and WKUP > clockdomains, such that PER will wake up at the same time CORE_L3 > does. > > This is not a complete workaround. For it to be complete: > > 1. the PER powerdomain's next power state must not be set to OSWR or > OFF if the CORE powerdomain's next power state is set to CSWR or > ON; > > 2. the UART3/4 FIFO and McBSP2/3 SIDETONE loopback tests should be run > if the LASTPOWERSTATEENTERED bits for PER and CORE indicate that > PER went OFF while CORE stayed on. If loopback tests fail, then > those devices will be unusable until PER and CORE can undergo a > transition from ON to OSWR/OFF and back ON. > > Signed-off-by: Paul Walmsley <paul@xxxxxxxxx> > Cc: Tero Kristo <t-kristo@xxxxxx> > Cc: Kevin Hilman <khilman@xxxxxx> Acked-by: Kevin Hilman <khilman@xxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
