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  1. 18 Dec, 2010 5 commits
    • Santosh Shilimkar's avatar
      omap4: l2x0: Enable early BRESP bit · b89cd71a
      Santosh Shilimkar authored 
      The AXI protocol specifies that the write response can only
be sent back to an AXI master when the last write data has been
accepted. This optimization enables the PL310 to send the write
response of certain write transactions as soon as the store buffer
accepts the write address. This behavior is not compatible with
the AXI protocol and is disabled by default. You enable this
optimization by setting the Early BRESP Enable bit in the
Auxiliary Control Register (bit [30]).
Signed-off-by: default avatarSantosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: default avatarMans Rullgard <mans@mansr.com>
Tested-by: default avatarNishanth Menon <nm@ti.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
      b89cd71a
    • Santosh Shilimkar's avatar
      omap4: l2x0: Set share override bit · b0f20ff9
      Santosh Shilimkar authored 
      Clearing bit 22 in the PL310 Auxiliary Control register (shared
attribute override enable) has the side effect of transforming Normal
Shared Non-cacheable reads into Cacheable no-allocate reads.

Coherent DMA buffers in Linux always have a Cacheable alias via the
kernel linear mapping and the processor can speculatively load cache
lines into the PL310 controller. With bit 22 cleared, Non-cacheable
reads would unexpectedly hit such cache lines leading to buffer
corruption
Signed-off-by: default avatarSantosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: default avatarNishanth Menon <nm@ti.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
      b0f20ff9
    • Mans Rullgard's avatar
      omap4: l2x0: enable instruction and data prefetching · 11e02640
      Mans Rullgard authored 
      Enabling L2 prefetching improves performance as shown on Panda
ES2.1 board with mem test, and it has measurable impact on
performances. I think we should consider it, even though it damages
"writes" a bit. (rebased to k.org)
Usually the prefetch is used at both levels together L1 + L2, however,
to enable the CP15 prefetch engines, these are under security, and on
GP devices, we cannot enable it(e.g. on PandaBoard). However, just
enabling PL310 prefetch seems to provide performance improvement,
as shown in the data below (from Ubuntu) and would be a great thing
to pull in.

What prefetch does is enable automatic next line prefetching. With this
enabled, whenever the PL310 receives a cachable read request, it
automatically prefetches the following cache line as well.

Measurement Data:
==
STOCK 10.10 WITHOUT PATCH

========================
~# ./memspeed
size    8388608 8192k 8M
offset  8388608, 0
buffers 0x2aaad000 0x2b2ad000
copy  libc          133 MB/s
copy  Android v5    273 MB/s
copy  Android NEON  235 MB/s
copy  INT32         116 MB/s
copy  ASM ARM       187 MB/s
copy  ASM VLDM 64   204 MB/s
copy  ASM VLDM 128  173 MB/s
copy  ASM VLD1      216 MB/s
read  ASM ARM       286 MB/s
read  ASM VLDM      242 MB/s
read  ASM VLD1      286 MB/s
write libc         1947 MB/s
write ASM ARM      1943 MB/s
write ASM VSTM     1942 MB/s
write ASM VST1     1935 MB/s

10.10 + PATCH
=============
~# ./memspeed
size    8388608 8192k 8M
offset  8388608, 0
buffers 0x2ab17000 0x2b317000
copy  libc          129 MB/s
copy  Android v5    256 MB/s
copy  Android NEON  356 MB/s
copy  INT32         127 MB/s
copy  ASM ARM       321 MB/s
copy  ASM VLDM 64   337 MB/s
copy  ASM VLDM 128  321 MB/s
copy  ASM VLD1      350 MB/s
read  ASM ARM       496 MB/s
read  ASM VLDM      470 MB/s
read  ASM VLD1      488 MB/s
write libc         1701 MB/s
write ASM ARM      1682 MB/s
write ASM VSTM     1693 MB/s
write ASM VST1     1681 MB/s
Signed-off-by: default avatarMans Rullgard <mans@mansr.com>
Signed-off-by: default avatarSantosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: default avatarNishanth Menon <nm@ti.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
      11e02640
    • Santosh Shilimkar's avatar
      omap4: l2x0: Construct the AUXCTRL value using defines · 1773e60a
      Santosh Shilimkar authored 
      This patch removes the hardcoded value of auxctrl value and
construct it using bitfields

Bit 25 is reserved and is always set to 1. Same value
of this bit is retained in this patch
Signed-off-by: default avatarSantosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: default avatarNishanth Menon <nm@ti.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
      1773e60a
    • Santosh Shilimkar's avatar
      ARM: l2x0: Add aux control register bitfields · 0aaa6f8f
      Santosh Shilimkar authored 
      This patch adds the PL310 Auxiliary Control Register bitfields
so that SOC's can use these bit fields to construct the AUXCTRL
value to be passed/programmed instead of hardcoding it.
Signed-off-by: default avatarSantosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
      0aaa6f8f
  3. 16 Dec, 2010 2 commits
  5. 15 Dec, 2010 16 commits
  7. 14 Dec, 2010 17 commits
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