[RFC PATCH v2 3/5] ARM: kernel: update cpu_suspend code to use cache LoUIS operations

Tue Dec 11 11:07:56 EST 2012

Hi all

On Thu, 20 Sep 2012, Dave Martin wrote:

> On Thu, Sep 20, 2012 at 11:25:14AM +0100, Lorenzo Pieralisi wrote:
> > On Wed, Sep 19, 2012 at 02:46:58PM +0100, Dave Martin wrote:
> > > On Tue, Sep 18, 2012 at 05:35:33PM +0100, Lorenzo Pieralisi wrote:
> > > > In processors like A15/A7 L2 cache is unified and integrated within the
> > > > processor cache hierarchy, so that it is not considered an outer cache
> > > > anymore. For processors like A15/A7 flush_cache_all() ends up cleaning
> > > > all cache levels up to Level of Coherency (LoC) that includes
> > > > the L2 unified cache.
> > > > 
> > > > When a single CPU is suspended (CPU idle) a complete L2 clean is not
> > > > required, so generic cpu_suspend code must clean the data cache using the
> > > > newly introduced cache LoUIS function.

Git bisect identified this patch, in the mainline as

commit dbee0c6fb4c1269b2dfc8b0b7a29907ea7fed560
Author: Lorenzo Pieralisi <lorenzo.pieralisi at arm.com>
Date:   Fri Sep 7 11:06:57 2012 +0530

    ARM: kernel: update cpu_suspend code to use cache LoUIS operations

as the culprit of the broken wake up from STR on mackerel, based on an 
sh7372 A8 SoC. .config attached.

Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
-------------- next part --------------
# CONFIG_ARM_PATCH_PHYS_VIRT is not set
CONFIG_EXPERIMENTAL=y
CONFIG_CROSS_COMPILE="arm-none-linux-gnueabi-"
CONFIG_LOCALVERSION="-ap4"
# CONFIG_LOCALVERSION_AUTO is not set
CONFIG_SYSVIPC=y
CONFIG_IKCONFIG=y
CONFIG_IKCONFIG_PROC=y
CONFIG_CC_OPTIMIZE_FOR_SIZE=y
CONFIG_SYSCTL_SYSCALL=y
CONFIG_KALLSYMS_ALL=y
CONFIG_EMBEDDED=y
CONFIG_SLAB=y
CONFIG_MODULES=y
CONFIG_MODULE_UNLOAD=y
# CONFIG_LBDAF is not set
# CONFIG_BLK_DEV_BSG is not set
# CONFIG_IOSCHED_DEADLINE is not set
# CONFIG_IOSCHED_CFQ is not set
CONFIG_ARCH_SHMOBILE=y
CONFIG_ARCH_SH7372=y
CONFIG_MACH_AP4EVB=y
CONFIG_MACH_MACKEREL=y
CONFIG_MEMORY_SIZE=0x20000000
# CONFIG_SH_TIMER_CMT is not set
# CONFIG_EM_TIMER_STI is not set
# CONFIG_ARM_THUMB is not set
CONFIG_AEABI=y
CONFIG_FORCE_MAX_ZONEORDER=12
CONFIG_USE_OF=y
CONFIG_ZBOOT_ROM_TEXT=0x0
CONFIG_ZBOOT_ROM_BSS=0x0
CONFIG_ARM_APPENDED_DTB=y
CONFIG_ARM_ATAG_DTB_COMPAT=y
CONFIG_CMDLINE="console=ttySC0,115200 console=tty1 earlyprintk=sh-sci.0,115200"
CONFIG_KEXEC=y
CONFIG_VFP=y
CONFIG_NEON=y
# CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
CONFIG_PM_RUNTIME=y
CONFIG_NET=y
CONFIG_PACKET=m
CONFIG_UNIX=y
CONFIG_INET=y
CONFIG_IP_MULTICAST=y
CONFIG_IP_PNP=y
CONFIG_IP_PNP_DHCP=y
CONFIG_IP_PNP_BOOTP=y
# CONFIG_INET_XFRM_MODE_TRANSPORT is not set
# CONFIG_INET_XFRM_MODE_TUNNEL is not set
# CONFIG_INET_XFRM_MODE_BEET is not set
CONFIG_INET_DIAG=m
CONFIG_INET_UDP_DIAG=m
# CONFIG_INET6_XFRM_MODE_TRANSPORT is not set
# CONFIG_INET6_XFRM_MODE_TUNNEL is not set
# CONFIG_INET6_XFRM_MODE_BEET is not set
# CONFIG_IPV6_SIT is not set
CONFIG_CFG80211=m
CONFIG_CFG80211_WEXT=y
CONFIG_MAC80211=m
CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
# CONFIG_FIRMWARE_IN_KERNEL is not set
CONFIG_PROC_DEVICETREE=y
# CONFIG_BLK_DEV is not set
CONFIG_NETDEVICES=y
CONFIG_NETCONSOLE=y
# CONFIG_NET_VENDOR_BROADCOM is not set
# CONFIG_NET_VENDOR_CHELSIO is not set
# CONFIG_NET_VENDOR_CIRRUS is not set
# CONFIG_NET_VENDOR_FARADAY is not set
# CONFIG_NET_VENDOR_INTEL is not set
# CONFIG_NET_VENDOR_MARVELL is not set
# CONFIG_NET_VENDOR_MICREL is not set
# CONFIG_NET_VENDOR_NATSEMI is not set
# CONFIG_NET_VENDOR_SEEQ is not set
CONFIG_SMSC911X=y
# CONFIG_NET_VENDOR_STMICRO is not set
# CONFIG_NET_VENDOR_WIZNET is not set
CONFIG_MDIO_BITBANG=y
# CONFIG_WLAN is not set
CONFIG_INPUT_MOUSEDEV=m
# CONFIG_INPUT_MOUSEDEV_PSAUX is not set
CONFIG_INPUT_EVDEV=y
# CONFIG_KEYBOARD_ATKBD is not set
CONFIG_KEYBOARD_TCA6416=y
CONFIG_KEYBOARD_SH_KEYSC=y
# CONFIG_INPUT_MOUSE is not set
CONFIG_INPUT_TOUCHSCREEN=y
CONFIG_TOUCHSCREEN_TSC2007=y
CONFIG_TOUCHSCREEN_ST1232=y
CONFIG_INPUT_MISC=y
CONFIG_INPUT_ADXL34X=m
# CONFIG_SERIO is not set
# CONFIG_LEGACY_PTYS is not set
CONFIG_SERIAL_SH_SCI=y
CONFIG_SERIAL_SH_SCI_NR_UARTS=8
CONFIG_SERIAL_SH_SCI_CONSOLE=y
CONFIG_SERIAL_SH_SCI_DMA=y
CONFIG_I2C=y
CONFIG_I2C_CHARDEV=y
CONFIG_I2C_SH_MOBILE=y
CONFIG_SPI=y
CONFIG_SPI_GPIO=m
CONFIG_GPIO_SYSFS=y
CONFIG_POWER_SUPPLY=y
# CONFIG_HWMON is not set
CONFIG_SSB=m
CONFIG_SSB_SDIOHOST=y
CONFIG_REGULATOR=y
CONFIG_REGULATOR_DUMMY=y
CONFIG_MEDIA_SUPPORT=m
CONFIG_MEDIA_CAMERA_SUPPORT=y
CONFIG_MEDIA_CONTROLLER=y
CONFIG_VIDEO_V4L2_SUBDEV_API=y
CONFIG_VIDEO_ADV_DEBUG=y
CONFIG_VIDEO_OV7670=m
CONFIG_VIDEO_VIVI=m
CONFIG_V4L_PLATFORM_DRIVERS=y
CONFIG_VIDEO_SH_VOU=m
CONFIG_SOC_CAMERA=m
CONFIG_SOC_CAMERA_IMX074=m
CONFIG_SOC_CAMERA_MT9M111=m
CONFIG_SOC_CAMERA_MT9T112=m
CONFIG_SOC_CAMERA_MT9V022=m
CONFIG_SOC_CAMERA_PLATFORM=m
CONFIG_SOC_CAMERA_OV5642=m
CONFIG_VIDEO_SH_MOBILE_CSI2=m
CONFIG_VIDEO_SH_MOBILE_CEU=m
CONFIG_V4L_MEM2MEM_DRIVERS=y
CONFIG_VIDEO_MEM2MEM_TESTDEV=m
CONFIG_FB=y
CONFIG_FB_SH_MOBILE_LCDC=y
# CONFIG_LCD_CLASS_DEVICE is not set
# CONFIG_BACKLIGHT_GENERIC is not set
CONFIG_FRAMEBUFFER_CONSOLE=y
CONFIG_LOGO=y
# CONFIG_LOGO_LINUX_MONO is not set
# CONFIG_LOGO_LINUX_VGA16 is not set
CONFIG_SOUND=m
CONFIG_SND=m
# CONFIG_SND_SUPPORT_OLD_API is not set
# CONFIG_SND_DRIVERS is not set
# CONFIG_SND_ARM is not set
# CONFIG_SND_SPI is not set
CONFIG_SND_SOC=m
CONFIG_SND_SOC_SH4_FSI=m
# CONFIG_USB_SUPPORT is not set
CONFIG_MMC=m
CONFIG_MMC_CLKGATE=y
CONFIG_MMC_SDHI=m
CONFIG_MMC_SH_MMCIF=m
CONFIG_RTC_CLASS=y
# CONFIG_RTC_HCTOSYS is not set
CONFIG_DMADEVICES=y
CONFIG_SH_DMAE=m
CONFIG_DMATEST=m
# CONFIG_IOMMU_SUPPORT is not set
CONFIG_EXT3_FS=y
# CONFIG_EXT3_DEFAULTS_TO_ORDERED is not set
# CONFIG_DNOTIFY is not set
CONFIG_FANOTIFY=y
CONFIG_VFAT_FS=m
CONFIG_TMPFS=y
# CONFIG_MISC_FILESYSTEMS is not set
CONFIG_NFS_FS=y
CONFIG_ROOT_NFS=y
CONFIG_NLS_CODEPAGE_437=m
CONFIG_NLS_ISO8859_1=m
CONFIG_NLS_ISO8859_15=m
CONFIG_PRINTK_TIME=y
CONFIG_MAGIC_SYSRQ=y
CONFIG_LOCKUP_DETECTOR=y
# CONFIG_SCHED_DEBUG is not set
CONFIG_DEBUG_OBJECTS=y
CONFIG_DEBUG_OBJECTS_FREE=y
CONFIG_DEBUG_SLAB=y
CONFIG_DEBUG_ATOMIC_SLEEP=y
# CONFIG_FTRACE is not set
# CONFIG_ARM_UNWIND is not set
CONFIG_DEBUG_USER=y
CONFIG_CRYPTO=y
CONFIG_CRYPTO_CBC=m
CONFIG_CRYPTO_ECB=m
CONFIG_CRYPTO_MD5=m
CONFIG_CRYPTO_AES=y
CONFIG_CRYPTO_DES=m