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[PATCH 3.19.y-ckt 077/160] ARM: dts: vf610: use reset values for L2 cache latencies

From Kamal Mostafa <kamal@canonical.com>
Newsgroups linux.kernel
Subject [PATCH 3.19.y-ckt 077/160] ARM: dts: vf610: use reset values for L2 cache latencies
Date 2016-01-20 02:30 +0100
Message-ID <qSPKZ-7CF-75@gated-at.bofh.it> (permalink)
References <qSPrA-7sT-9@gated-at.bofh.it>
Organization linux.* mail to news gateway

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3.19.8-ckt13 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Stefan Agner <stefan@agner.ch>

commit 9c17190595840b4ed30e8d5f286636ceb28aae4f upstream.

Linux on Vybrid used several different L2 latencies so far, none
of them seem to be the right ones. According to the application note
AN4947 ("Understanding Vybrid Architecture"), the tag portion runs
on CPU clock and is inside the L2 cache controller, whereas the data
portion is stored in the external SRAM running on platform clock.
Hence it is likely that the correct value requires a higher data
latency then tag latency.

These are the values which have been used so far:
- The mainline values:
  arm,data-latency = <1 1 1>;
  arm,tag-latency = <2 2 2>;
  Those values have lead to problems on higher clocks. They look
  like a poor translation from the reset values (missing +1 offset
  and a mix up between tag/latency values).
- The Linux 3.0 (SoC vendor BSP) values (converted to DT notation):
  arm,data-latency = <4 2 3>
  arm,tag-latency = <4 2 3>
  The cache initialization function along with the value matches the
  i.MX6 code from the same kernel, so it seems that those values have
  just been copied.
- The Colibri values:
  arm,data-latency = <2 1 2>;
  arm,tag-latency = <3 2 3>;
  Those were a mix between the values of the Linux 3.0 based BSP and
  the mainline values above.
- The SoC Reset values (converted to DT notation):
  arm,data-latency = <3 3 3>;
  arm,tag-latency = <2 2 2>;

So far there is no official statement on what the correct values are.
See also the related Freescale community thread:
https://community.freescale.com/message/579785#579785

For now, the reset values seem to be the best bet. Remove all other
"bogus" values and use the reset value on vf610.dtsi level.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 arch/arm/boot/dts/vf610-colibri.dtsi | 5 -----
 arch/arm/boot/dts/vf610.dtsi         | 2 +-
 2 files changed, 1 insertion(+), 6 deletions(-)

diff --git a/arch/arm/boot/dts/vf610-colibri.dtsi b/arch/arm/boot/dts/vf610-colibri.dtsi
index 19fe045..2d7eab7 100644
--- a/arch/arm/boot/dts/vf610-colibri.dtsi
+++ b/arch/arm/boot/dts/vf610-colibri.dtsi
@@ -18,8 +18,3 @@
 		reg = <0x80000000 0x10000000>;
 	};
 };
-
-&L2 {
-	arm,data-latency = <2 1 2>;
-	arm,tag-latency = <3 2 3>;
-};
diff --git a/arch/arm/boot/dts/vf610.dtsi b/arch/arm/boot/dts/vf610.dtsi
index 5f8eb1b..58bc6e4 100644
--- a/arch/arm/boot/dts/vf610.dtsi
+++ b/arch/arm/boot/dts/vf610.dtsi
@@ -19,7 +19,7 @@
 		reg = <0x40006000 0x1000>;
 		cache-unified;
 		cache-level = <2>;
-		arm,data-latency = <1 1 1>;
+		arm,data-latency = <3 3 3>;
 		arm,tag-latency = <2 2 2>;
 	};
 };
-- 
1.9.1

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  [PATCH 3.19.y-ckt 150/160] net: fix warnings in 'make htmldocs' by moving macro definition out of field declaration Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
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  [PATCH 3.19.y-ckt 053/160] dmaengine: at_xdmac: fix macro typo Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
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  [PATCH 3.19.y-ckt 147/160] amd-xgbe: fix a couple timeout loops Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 141/160] sctp: convert sack_needed and sack_generation to bits Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 093/160] genirq: Prevent chip buslock deadlock Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 104/160] powerpc/powernv: Fix the overflow of OPAL message notifiers head array Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 107/160] s390/dis: Fix handling of format specifiers Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 106/160] ALSA: hda - Set SKL+ hda controller power at freeze() and thaw() Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 128/160] ASoC: arizona: Fix bclk for sample rates that are multiple of 4kHz Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:40 +0100
  [PATCH 3.19.y-ckt 009/160] sctp: update the netstamp_needed counter when copying sockets Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 116/160] xen/pciback: Return error on XEN_PCI_OP_enable_msix when device has MSI or MSI-X enabled Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 110/160] xen-netback: use RING_COPY_REQUEST() throughout Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 158/160] net: possible use after free in dst_release Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 051/160] net: mvpp2: fix buffers' DMA handling on RX path Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 055/160] vhost: relax log address alignment Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 067/160] dm thin metadata: fix bug when taking a metadata snapshot Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 160/160] firmware: dmi_scan: Fix UUID endianness for SMBIOS >= 2.6 Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 046/160] ARM: 8465/1: mm: keep reserved ASIDs in sync with mm after multiple rollovers Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 010/160] sctp: also copy sk_tsflags when copying the socket Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 103/160] ARC: dw2 unwind: Ignore CIE version !=1 gracefully instead of bailing Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 002/160] sched/wait: Fix signal handling in bit wait helpers Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 109/160] xen-netback: don't use last request to determine minimum Tx credit Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 105/160] powerpc/powernv: pr_warn_once on unsupported OPAL_MSG type Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 081/160] powercap / RAPL: fix BIOS lock check Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 023/160] KVM: x86: Reload pit counters for all channels when restoring state Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 080/160] USB: add quirk for devices with broken LPM Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 021/160] af_unix: Revert 'lock_interruptible' in stream receive code Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 049/160] ALSA: rme96: Fix unexpected volume reset after rate changes Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 079/160] xhci: fix usb2 resume timing and races. Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 132/160] ftrace/scripts: Fix incorrect use of sprintf in recordmcount Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 056/160] virtio: fix memory leak of virtio ida cache layers Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 007/160] atl1c: Improve driver not to do order 4 GFP_ATOMIC allocation Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 140/160] usb: musb: USB_TI_CPPI41_DMA requires dmaengine support Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 083/160] mm: hugetlb: fix hugepage memory leak caused by wrong reserve count Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 094/160] ALSA: usb-audio: Add a more accurate volume quirk for AudioQuest DragonFly Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 157/160] net: sched: fix missing free per cpu on qstats Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 135/160] ARM: versatile: fix MMC/SD interrupt assignment Kamal Mostafa <kamal@canonical.com> - 2016-01-20 02:50 +0100
  [PATCH 3.19.y-ckt 070/160] ASoC: es8328: Fix deemphasis values Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100
  [PATCH 3.19.y-ckt 096/160] ARM: 8471/1: need to save/restore arm register(r11) when it is corrupted Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100
  [PATCH 3.19.y-ckt 061/160] radeon/cik: Fix GFX IB test on Big-Endian Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100
  [PATCH 3.19.y-ckt 043/160] usb: Use the USB_SS_MULT() macro to decode burst multiplier for log message Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100
  [PATCH 3.19.y-ckt 146/160] mISDN: fix a loop count Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100
  [PATCH 3.19.y-ckt 145/160] sh_eth: fix TX buffer byte-swapping Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100
  [PATCH 3.19.y-ckt 123/160] x86/mce: Ensure offline CPUs don't participate in rendezvous process Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100
  [PATCH 3.19.y-ckt 013/160] net: add validation for the socket syscall protocol argument Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100
  [PATCH 3.19.y-ckt 078/160] ses: fix additional element traversal bug Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100
  [PATCH 3.19.y-ckt 075/160] vgaarb: fix signal handling in vga_get() Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100
  [PATCH 3.19.y-ckt 089/160] sh64: fix __NR_fgetxattr Kamal Mostafa <kamal@canonical.com> - 2016-01-20 03:00 +0100

csiph-web