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a3fed9bc18
linux-kernel-test/arch/arm/mach-omap2
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Jon Hunter a3fed9bc18 omap3: Prevent SDRC deadlock when L3 is changing frequency 
When changing the L3 clock frequency, the CPU is executing from internal RAM
and the SDRC clock is disabled. During this time accesses made to external
DDR are stalled. If the ARM subsystem attempts to access the DDR while the
SDRC clock is disabled this will stall the CPU until the access to the SDRC
timeouts. A timeout on the SDRC should never occur. Once a timeout occurs all
the following accesses will be aborted and the DDR is no longer accessible.

Although the code being executed in the internal RAM does not directly access
the DDR, it was found that the branch prediction logic in the CPU may cause
the CPU to prefetch code from a DDR location while the SDRC clock is disabled.
This was causing an SDRC timeout which resulted in a system hang.

This patch fixes this problem by ensuring the branch prediction logic is
disabled while changing the L3 clock frequency. The branch prediction logic
is disabled by clearing the Z-bit in the ARM CTRL register.

Disabling the branch prediction logic does not have any noticable impact
on the execution time of this code section. The hardware observability
signals were used to monitor the sdrc idle time with and without this
patch when operating at different CPU frequencies (150MHz, 500MHz and
600MHz) and the total sdrc idle time when changing frequenct was in
the range of 9-11us. This was measured on an omap3430 SDP running the
omapzoom p-android-omap-2.6.29 branch.

Signed-off-by: Jon Hunter <jon-hunter@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Richard Woodruff <r-woodruff2@ti.com>
Cc: Tony Lindgren <tony@atomide.com>
2010-09-27 14:02:59 -06:00
..
include/mach omap4: control: Add the register definition headers 2010-09-27 14:02:58 -06:00
board-2430sdp.c Merge branch 'devel-map-io' into omap-for-linus 2010-08-04 14:43:45 +03:00
board-3430sdp.c Merge branch 'devel-map-io' into omap-for-linus 2010-08-04 14:43:45 +03:00
board-3630sdp.c Merge branch 'devel-map-io' into omap-for-linus 2010-08-04 14:43:45 +03:00
board-4430sdp.c Merge branch 'devel-map-io' into omap-for-linus 2010-08-04 14:43:45 +03:00
board-am3517evm.c omap3: introduce omap3_map_io 2010-08-04 14:43:18 +03:00
board-apollon.c Merge branch 'devel-map-io' into omap-for-linus 2010-08-04 14:43:45 +03:00
board-cm-t35.c Merge branch 'devel-map-io' into omap-for-linus 2010-08-04 14:43:45 +03:00
board-devkit8000.c Merge branch 'devel-map-io' into omap-for-linus 2010-08-04 14:43:45 +03:00
board-flash.c omap3 flash: rename board-sdp-flash.c to be use by other boards 2010-08-02 15:43:29 +03:00
board-generic.c Merge branch 'devel-map-io' into omap-for-linus 2010-08-04 14:43:45 +03:00
board-h4.c Merge branch 'devel-map-io' into omap-for-linus 2010-08-04 14:43:45 +03:00
board-igep0020.c omap3: introduce omap3_map_io 2010-08-04 14:43:18 +03:00
board-ldp.c Merge branch 'devel-map-io' into omap-for-linus 2010-08-04 14:43:45 +03:00
board-n8x0.c Merge branch 'devel-map-io' into omap-for-linus 2010-08-04 14:43:45 +03:00
board-omap3beagle.c Merge branch 'devel-map-io' into omap-for-linus 2010-08-04 14:43:45 +03:00
board-omap3evm.c Merge branch 'for-linus' of git://gitorious.org/linux-omap-dss2/linux 2010-08-08 10:02:59 -07:00
board-omap3pandora.c omap: pandora: pass wl1251 information to SDIO core 2010-08-11 08:59:04 -07:00
board-omap3stalker.c omap3: introduce omap3_map_io 2010-08-04 14:43:18 +03:00
board-omap3touchbook.c Merge branch 'devel-map-io' into omap-for-linus 2010-08-04 14:43:45 +03:00
board-omap4panda.c omap4: Add OMAP4 Panda Support 2010-08-02 13:18:05 +03:00
board-overo.c Merge branch 'devel-map-io' into omap-for-linus 2010-08-04 14:43:45 +03:00
board-rx51-peripherals.c Merge branch 'devel-misc' into omap-for-linus 2010-08-02 14:23:38 +03:00
board-rx51-sdram.c omap3: rx51: Add SDRAM init 2009-11-22 10:24:33 -08:00
board-rx51-video.c omap: mux: Remove old mux code 2010-07-05 16:31:40 +03:00
board-rx51.c omap3: Unify omap2_set_globals_3[43,6x]x functions 2010-08-04 14:43:18 +03:00
board-zoom2.c Merge branch 'devel-map-io' into omap-for-linus 2010-08-04 14:43:45 +03:00
board-zoom3.c Merge branch 'devel-map-io' into omap-for-linus 2010-08-04 14:43:45 +03:00
board-zoom-debugboard.c omap2/3: Fix DEBUG_LL for omap zoom2/3 2010-05-03 17:53:08 -07:00
board-zoom-peripherals.c omap3: zoom2/3 / 3630sdp: Don't init always all uarts 2010-03-15 16:34:17 -05:00
clkt2xxx_apll.c OMAP2 PRCM: convert OMAP2 PRCM macros to the _SHIFT/_MASK suffixes 2010-05-20 12:31:04 -06:00
clkt2xxx_dpllcore.c OMAP2xxx clock: move the DPLL+CORE composite clock code into mach-omap2/clkt2xxx_dpllcore.c 2010-01-26 20:13:06 -07:00
clkt2xxx_osc.c OMAP2xxx clock: move osc_clk code into mach-omap2/clkt2xxx_osc.c 2010-01-28 18:13:49 -07:00
clkt2xxx_sys.c OMAP2xxx clock: move sys_clk code into mach-omap2/clkt2xxx_sys.c 2010-01-28 18:13:49 -07:00
clkt2xxx_virt_prcm_set.c OMAP2 clock: fix recursive spinlock attempt when CONFIG_CPU_FREQ=y 2010-05-20 12:31:14 -06:00
clkt34xx_dpll3m2.c OMAP3/4 clock: split into per-chip family files 2010-02-24 12:16:15 -07:00
clkt_clksel.c OMAP2+ clock: clean up clkt_clksel.c 2010-05-20 12:31:06 -06:00
clkt_dpll.c OMAP2/3/4 clock: fix DPLL multiplier value errors; also copyrights, includes, documentation 2010-02-24 12:15:03 -07:00
clock2xxx.c OMAP2/3 clock: combine OMAP2 & 3 boot-time MPU rate change code 2010-02-24 17:45:15 -07:00
clock2xxx.h OMAP2 clock: split OMAP2420, OMAP2430 clock data into their own files 2010-02-24 12:29:42 -07:00
clock3xxx_data.c OMAP3: Fix a cpu type check problem 2010-08-16 09:21:19 +03:00
clock3xxx.c OMAP2/3 clock: combine OMAP2 & 3 boot-time MPU rate change code 2010-02-24 17:45:15 -07:00
clock3xxx.h OMAP3/4 clock: split into per-chip family files 2010-02-24 12:16:15 -07:00
clock34xx.c OMAP3/4 clock: split into per-chip family files 2010-02-24 12:16:15 -07:00
clock34xx.h OMAP3/4 clock: split into per-chip family files 2010-02-24 12:16:15 -07:00
clock36xx.c OMAP3/4 clock: split into per-chip family files 2010-02-24 12:16:15 -07:00
clock36xx.h OMAP3/4 clock: split into per-chip family files 2010-02-24 12:16:15 -07:00
clock44xx_data.c OMAP4: clocks: Fix ES2 clock issues 2010-09-27 14:02:56 -06:00
clock44xx.h OMAP3/4 clock: split into per-chip family files 2010-02-24 12:16:15 -07:00
clock2420_data.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2010-05-21 14:46:51 -07:00
clock2430_data.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2010-05-21 14:46:51 -07:00
clock2430.c OMAP2 clock: split OMAP2420, OMAP2430 clock data into their own files 2010-02-24 12:29:42 -07:00
clock3517.c OMAP3/4 clock: split into per-chip family files 2010-02-24 12:16:15 -07:00
clock3517.h OMAP3/4 clock: split into per-chip family files 2010-02-24 12:16:15 -07:00
clock_common_data.c OMAP3 clock: rename RATE_IN_343X, RATE_IN_3430ES2 to match reality 2010-05-20 12:31:07 -06:00
clock.c OMAP2+ clock: clean up clkt_clksel.c 2010-05-20 12:31:06 -06:00
clock.h OMAP2+ clock: clean up clkt_clksel.c 2010-05-20 12:31:06 -06:00
clockdomain.c OMAP2 PRCM: convert OMAP2 PRCM macros to the _SHIFT/_MASK suffixes 2010-05-20 12:31:04 -06:00
clockdomains44xx.h OMAP4: PRM: Remove MPU internal code name and apply PRCM naming convention 2010-05-20 12:31:11 -06:00
clockdomains.h omap2: Convert ARCH_OMAP24XX to ARCH_OMAP2 2010-02-15 09:27:01 -08:00
cm4xxx.c OMAP4: hwmod & CM: Implement the omap4_cm_wait_module_ready function 2010-05-20 12:31:08 -06:00
cm44xx.h OMAP4: PM: Define additional registers for ES2 2010-09-27 14:02:56 -06:00
cm-regbits-24xx.h OMAP2 PRCM: convert OMAP2 PRCM macros to the _SHIFT/_MASK suffixes 2010-05-20 12:31:04 -06:00
cm-regbits-34xx.h OMAP3 PRCM: convert OMAP3 PRCM macros to the _SHIFT/_MASK suffixes 2010-05-20 12:31:05 -06:00
cm-regbits-44xx.h OMAP4: CM & PRM: Update PRCM register bitshifts and masks for ES2 2010-09-27 14:02:55 -06:00
cm.c OMAP24xx: CM: fix mask used for checking IDLEST status 2010-07-26 16:34:28 -06:00
cm.h OMAP4: hwmod & CM: Implement the omap4_cm_wait_module_ready function 2010-05-20 12:31:08 -06:00
control.c omap4: control: Add accessor api's for pad control module 2010-09-27 14:02:57 -06:00
cpuidle34xx.c OMAP3: cpuidle: Add valid field into C-state parameter passing 2010-02-23 11:05:02 -08:00
devices.c Merge branch 'v2.6.35-omap-mailbox-for-next' of git://gitorious.org/~doyu/lk/mainline into omap-for-linus 2010-08-04 16:10:38 +03:00
dpll3xxx.c fix typos concerning "hierarchy" 2010-06-16 18:03:14 +02:00
emu.c omap2/3: Fix initcalls for multi-omap 2010-02-15 09:27:05 -08:00
gpmc-nand.c omap3 nand: cleanup virtual address usages 2010-08-02 15:30:38 +03:00
gpmc-onenand.c omap: headers: Move remaining headers from include/mach to include/plat 2009-10-20 09:40:47 -07:00
gpmc-smc91x.c omap: use smc91x_platdata to setup smc91x 2009-12-11 16:16:33 -08:00
gpmc.c omap3 nand: cleanup virtual address usages 2010-08-02 15:30:38 +03:00
hsmmc.c omap4: control: Fix the control module register accesses 2010-09-27 14:02:58 -06:00
hsmmc.h omap: pandora: pass wl1251 information to SDIO core 2010-08-11 08:59:04 -07:00
i2c.c omap: mux: Convert 2420 platform init code to use new mux code 2010-07-05 16:31:40 +03:00
id.c omap4: control: Fix the control module register accesses 2010-09-27 14:02:58 -06:00
io.c Merge branch 'devel-map-io' into omap-for-linus 2010-08-04 14:43:45 +03:00
iommu2.c omap iommu: move iommu_disable at fault to the above layer 2010-06-29 07:55:07 +03:00
irq.c OMAP2/3: IRQ: ensure valid base address 2010-02-03 08:48:06 -08:00
Kconfig omap4: Add OMAP4 Panda Support 2010-08-02 13:18:05 +03:00
mailbox.c omap: mailbox: reorganize headers 2010-08-04 15:50:20 +03:00
Makefile omap: Fix sev instruction usage for multi-omap 2010-08-16 09:22:04 +03:00
Makefile.boot
mcbsp.c Merge branch 'omap-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap-2.6 2010-08-08 10:01:46 -07:00
mux34xx.c omap: mux: Remove unncessary parens from mux34xx.c 2010-07-05 16:31:36 +03:00
mux34xx.h omap: mux: Add 36xx CBP package support 2009-12-11 16:16:33 -08:00
mux2420.c omap: mux: Add data for 2420 2010-07-05 16:31:36 +03:00
mux2420.h omap: mux: Add data for 2420 2010-07-05 16:31:36 +03:00
mux2430.c omap: mux: Add data for 2430 2010-07-05 16:31:36 +03:00
mux2430.h omap: mux: Add data for 2430 2010-07-05 16:31:36 +03:00
mux.c omap: mux: fix multipath gpio handling 2010-08-02 14:23:07 +03:00
mux.h omap: mux: Add data for 2430 2010-07-05 16:31:36 +03:00
omap4-common.c omap4: Move SOC specific code from board file 2010-05-20 11:17:51 -07:00
omap44xx-smc.S omap4: Add smc API to read AuxCoreBoot0 register 2010-08-02 13:18:18 +03:00
omap_hwmod_3xxx_data.c OMAP3: hwmod data: add data for OMAP3 IVA2 2010-07-26 16:34:32 -06:00
omap_hwmod_2420_data.c OMAP2: hwmod data: add IVA1 (2420), IVA2 (2430) hwmods 2010-07-26 16:34:33 -06:00
omap_hwmod_2430_data.c OMAP2: hwmod data: add IVA1 (2420), IVA2 (2430) hwmods 2010-07-26 16:34:33 -06:00
omap_hwmod_common_data.c OMAP: hwmod data: add class for IVA hwmods 2010-07-26 16:34:31 -06:00
omap_hwmod_common_data.h OMAP: hwmod data: add class for IVA hwmods 2010-07-26 16:34:31 -06:00
omap_hwmod.c OMAP2+: hwmod/device: update documentation and copyright 2010-07-26 16:34:33 -06:00
omap-headsmp.S omap4: Add smc API to read AuxCoreBoot0 register 2010-08-02 13:18:18 +03:00
omap-hotplug.c omap4: hotplug: Add basic CPU hotplug support 2010-08-02 13:18:19 +03:00
omap-iommu.c omap iommu: update ducati mmu irq define name 2010-06-29 07:55:08 +03:00
omap-smp.c omap: Fix sev instruction usage for multi-omap 2010-08-16 09:22:04 +03:00
opp2xxx.h omap2/3: Multiboot compile fixes to compile in omap2 and omap3 2010-02-15 09:26:55 -08:00
opp2420_data.c OMAP2xxx OPP: clean up comments in OPP data 2010-01-08 15:23:15 -07:00
opp2430_data.c OMAP2xxx OPP: clean up comments in OPP data 2010-01-08 15:23:15 -07:00
pm24xx.c omap: mux: Remove old mux code 2010-07-05 16:31:40 +03:00
pm34xx.c OMAP3: PM: ensure IO wakeups are properly disabled 2010-08-16 09:22:05 +03:00
pm44xx.c omap4: suspend: Add basic system suspend support 2010-08-02 13:18:18 +03:00
pm-debug.c OMAP3: PM: Add milliseconds interface to suspend wakeup timer 2010-05-12 09:39:00 -07:00
pm.c OMAP: PM: create omap_devices for MPU, DSP, L3 2010-07-26 16:34:31 -06:00
pm.h OMAP3: PM: Add milliseconds interface to suspend wakeup timer 2010-05-12 09:39:00 -07:00
powerdomain.c OMAP2: powerdomain: Add break in switch statement 2010-08-03 10:21:07 +03:00
powerdomains24xx.h omap2: Convert ARCH_OMAP24XX to ARCH_OMAP2 2010-02-15 09:27:01 -08:00
powerdomains34xx.h omap: 3630: disable TLL SAR on 3630 ES1 2010-08-04 14:43:52 +03:00
powerdomains44xx.h OMAP4: powerdomain: Update DSS logic state for ES2 2010-09-27 14:02:56 -06:00
powerdomains.h OMAP2+ powerdomains/clockdomains: prepare for multi-OMAP configs 2010-01-29 10:14:23 -07:00
prcm-common.h OMAP4: PRCM: Remove duplicate definition of base addresses 2010-05-20 12:31:12 -06:00
prcm.c OMAP2+ PRCM: convert remaining PRCM macros to the _SHIFT/_MASK suffixes 2010-05-20 12:31:05 -06:00
prm44xx.h OMAP4: PM: Define additional registers for ES2 2010-09-27 14:02:56 -06:00
prm-regbits-24xx.h OMAP2 PRCM: convert OMAP2 PRCM macros to the _SHIFT/_MASK suffixes 2010-05-20 12:31:04 -06:00
prm-regbits-34xx.h OMAP3 PRCM: convert OMAP3 PRCM macros to the _SHIFT/_MASK suffixes 2010-05-20 12:31:05 -06:00
prm-regbits-44xx.h OMAP4: CM & PRM: Update PRCM register bitshifts and masks for ES2 2010-09-27 14:02:55 -06:00
prm.h OMAP4: PRM: Remove MPU internal code name and apply PRCM naming convention 2010-05-20 12:31:11 -06:00
sdram-hynix-h8mbx00u0mer-0em.h omap3: zoom: Introduce zoom3 board support 2009-11-22 10:24:33 -08:00
sdram-micron-mt46h32m32lf-6.h omap: headers: Move remaining headers from include/mach to include/plat 2009-10-20 09:40:47 -07:00
sdram-numonyx-m65kxxxxam.h omap3: SDRC: add timing data for Numonyx M65KxxxxAM 2010-02-17 17:23:20 -08:00
sdram-qimonda-hyb18m512160af-6.h omap: headers: Move remaining headers from include/mach to include/plat 2009-10-20 09:40:47 -07:00
sdrc2xxx.c omap: headers: Move remaining headers from include/mach to include/plat 2009-10-20 09:40:47 -07:00
sdrc.c omap2/3/4: ioremap omap_globals module 2010-02-23 10:57:40 -08:00
sdrc.h OMAP2 clock: convert clock24xx.h to clock2xxx_data.c, opp2xxx* 2009-12-11 16:16:00 -07:00
serial.c omap2/3/4: serial: errata i202: fix for MDR1 access 2010-08-02 13:18:12 +03:00
sleep24xx.S omap: headers: Move remaining headers from include/mach to include/plat 2009-10-20 09:40:47 -07:00
sleep34xx.S fix typos concerning "acquire" 2010-06-16 18:03:15 +02:00
sram34xx.S omap3: Prevent SDRC deadlock when L3 is changing frequency 2010-09-27 14:02:59 -06:00
sram242x.S omap: Split OMAP2_IO_ADDRESS to L3 and L4 2009-10-19 15:25:31 -07:00
sram243x.S omap: Split OMAP2_IO_ADDRESS to L3 and L4 2009-10-19 15:25:31 -07:00
timer-gp.c OMAP4: clock: Remove clock hacks from timer-gp.c 2010-02-24 17:45:17 -07:00
timer-mpu.c omap4: Use irq line defines from irq-44xx.h 2010-02-23 15:29:08 -08:00
usb-ehci.c omap: mux: Remove old mux code 2010-07-05 16:31:40 +03:00
usb-fs.c omap: mux: Make omap2 FS USB code use new mux functions 2010-07-05 16:31:38 +03:00
usb-musb.c omap: mux: Remove old mux code 2010-07-05 16:31:40 +03:00
usb-tusb6010.c omap: mux: Convert 2420 platform init code to use new mux code 2010-07-05 16:31:40 +03:00