On Wed, Nov 25, 2015 at 11:16 PM, Jean-Christophe Dubois <j...@tribudubois.net> wrote: > Signed-off-by: Jean-Christophe Dubois <j...@tribudubois.net>
This seems to slow down boot performance for i.MX25 Linux. Admittedly, the issue looks to be in timeout code for an unmodelled periph (NAND): ------------[ cut here ]------------ WARNING: CPU: 0 PID: 1 at /home/pcrost/poky/build/tmp/work-shared/qemuarmv5imx/kernel-source/drivers/mtd/nand/mxc_nand.c:464 wait_op_done+0xf0/0x114() timeout! useirq=0 Modules linked in: CPU: 0 PID: 1 Comm: swapper Not tainted 4.2.1 #1 Hardware name: Freescale i.MX25 (Device Tree Support) [<c000eec8>] (unwind_backtrace) from [<c000d2b0>] (show_stack+0x10/0x14) [<c000d2b0>] (show_stack) from [<c0019154>] (warn_slowpath_common+0x74/0xac) [<c0019154>] (warn_slowpath_common) from [<c00191bc>] (warn_slowpath_fmt+0x30/0x40) [<c00191bc>] (warn_slowpath_fmt) from [<c036eaa0>] (wait_op_done+0xf0/0x114) [<c036eaa0>] (wait_op_done) from [<c0369698>] (nand_scan_ident+0xdc/0x1560) [<c0369698>] (nand_scan_ident) from [<c036e6a8>] (mxcnd_probe+0x378/0x5c0) [<c036e6a8>] (mxcnd_probe) from [<c03081a4>] (platform_drv_probe+0x44/0xac) [<c03081a4>] (platform_drv_probe) from [<c0306654>] (driver_probe_device+0x180/0x2c4) [<c0306654>] (driver_probe_device) from [<c0306824>] (__driver_attach+0x8c/0x90) [<c0306824>] (__driver_attach) from [<c0304a80>] (bus_for_each_dev+0x70/0xa0) [<c0304a80>] (bus_for_each_dev) from [<c0305d08>] (bus_add_driver+0x188/0x210) [<c0305d08>] (bus_add_driver) from [<c03071d4>] (driver_register+0x78/0xf8) [<c03071d4>] (driver_register) from [<c00095e0>] (do_one_initcall+0x84/0x1f0) [<c00095e0>] (do_one_initcall) from [<c071bd24>] (kernel_init_freeable+0x108/0x1c8) [<c071bd24>] (kernel_init_freeable) from [<c0541a0c>] (kernel_init+0x8/0xec) [<c0541a0c>] (kernel_init) from [<c000a340>] (ret_from_fork+0x14/0x34) ---[ end trace 13248cb1a1bbcb9c ]--- <<Delay happens here>> nand: No NAND device found ... Without this patch, the delay is around 2 seconds, with this patch it is 10+. Any idea what would cause it? Are you removing the NAND from DTS for your testing and do we not care about these errors paths? Regards, Peter > --- > > Changes since v1: > * rework loging to match other i.MX drivers > > Changes since v2: > * We moved to an inheritance QOM scheme > > Changes since v3: > * Rework logging based on comments. > > hw/arm/fsl-imx25.c | 2 +- > hw/misc/Makefile.objs | 1 + > hw/misc/imx25_ccm.c | 276 > ++++++++++++++++++++++++++++++++++++++++++++ > include/hw/arm/fsl-imx25.h | 4 +- > include/hw/misc/imx25_ccm.h | 59 ++++++++++ > 5 files changed, 339 insertions(+), 3 deletions(-) > create mode 100644 hw/misc/imx25_ccm.c > create mode 100644 include/hw/misc/imx25_ccm.h >
