From 251383c7c50cf17664a4d7d60d3a52d8827a0e11 Mon Sep 17 00:00:00 2001 From: Robin Getz Date: Thu, 14 Aug 2008 15:12:55 +0800 Subject: Blackfin arch: Allow ins functions to have a low latency version Signed-off-by: Robin Getz Signed-off-by: Bryan Wu --- arch/blackfin/Kconfig | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) (limited to 'arch/blackfin/Kconfig') diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig index cc2add7e39e..ededf9319f3 100644 --- a/arch/blackfin/Kconfig +++ b/arch/blackfin/Kconfig @@ -622,6 +622,33 @@ config CPLB_SWITCH_TAB_L1 If enabled, the CPLB Switch Tables are linked into L1 data memory. (less latency) +comment "Speed Optimizations" +config BFIN_INS_LOWOVERHEAD + bool "ins[bwl] low overhead, higher interrupt latency" + default y + help + Reads on the Blackfin are speculative. In Blackfin terms, this means + they can be interrupted at any time (even after they have been issued + on to the external bus), and re-issued after the interrupt occurs. + For memory - this is not a big deal, since memory does not change if + it sees a read. + + If a FIFO is sitting on the end of the read, it will see two reads, + when the core only sees one since the FIFO receives both the read + which is cancelled (and not delivered to the core) and the one which + is re-issued (which is delivered to the core). + + To solve this, interrupts are turned off before reads occur to + I/O space. This option controls which the overhead/latency of + controlling interrupts during this time + "n" turns interrupts off every read + (higher overhead, but lower interrupt latency) + "y" turns interrupts off every loop + (low overhead, but longer interrupt latency) + + default behavior is to leave this set to on (type "Y"). If you are experiencing + interrupt latency issues, it is safe and OK to turn this off. + endmenu -- cgit v1.2.3