v3.19: Nokia N900 (qemu) - omap_aes error

["Pali Rohár" <pali.rohar@gmail.com>]

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Hello,

when I enable problematic omap_aes.ko driver (also in DT) for 
Nokia N900 machine in qemu (it emulates OMAP GP device, not HS) I 
get this error message in dmesg at modprobe time:

[   37.660339] ------------[ cut here ]------------
[   37.663940] WARNING: CPU: 0 PID: 173 at arch/arm/mach-
omap2/omap_hwmod.c:2182 _idle+0x28/0x64()
[   37.668762] omap_hwmod: aes: idle state can only be entered 
from enabled state
[   37.672271] Modules linked in: omap_aes(+)
[   37.675933] CPU: 0 PID: 173 Comm: modprobe Not tainted 3.19.0-
rc5+ #299
[   37.679534] Hardware name: Nokia RX-51 board
[   37.683227] [<c0012678>] (unwind_backtrace) from [<c0010d44>] 
(show_stack+0x10/0x14)
[   37.686920] [<c0010d44>] (show_stack) from [<c0032194>] 
(warn_slowpath_common+0x84/0xac)
[   37.690765] [<c0032194>] (warn_slowpath_common) from 
[<c003223c>] (warn_slowpath_fmt+0x2c/0x3c)
[   37.694366] [<c003223c>] (warn_slowpath_fmt) from [<c0020cb0>] 
(_idle+0x28/0x64)
[   37.698791] [<c0020cb0>] (_idle) from [<c0021078>] 
(omap_hwmod_idle+0x30/0x78)
[   37.702636] [<c0021078>] (omap_hwmod_idle) from [<c00222c4>] 
(omap_device_idle+0x48/0x6c)
[   37.707153] [<c00222c4>] (omap_device_idle) from [<c0022304>] 
(_od_runtime_suspend+0x1c/0x24)
[   37.710723] [<c0022304>] (_od_runtime_suspend) from 
[<c0269680>] (__rpm_callback+0x8c/0xdc)
[   37.714385] [<c0269680>] (__rpm_callback) from [<c0269740>] 
(rpm_callback+0x70/0x88)
[   37.717987] [<c0269740>] (rpm_callback) from [<c0269f74>] 
(rpm_suspend+0x2e8/0x5a4)
[   37.721710] [<c0269f74>] (rpm_suspend) from [<c026a6ec>] 
(__pm_runtime_idle+0x58/0x9c)
[   37.725402] [<c026a6ec>] (__pm_runtime_idle) from [<bf00129c>] 
(omap_aes_probe+0x15c/0x448 [omap_aes])
[   37.733489] [<bf00129c>] (omap_aes_probe [omap_aes]) from 
[<c0263d78>] (platform_drv_probe+0x48/0x90)
[   37.740936] [<c0263d78>] (platform_drv_probe) from 
[<c02624ec>] (really_probe+0xac/0x1e0)
[   37.745025] [<c02624ec>] (really_probe) from [<c0262718>] 
(driver_probe_device+0x30/0x48)
[   37.749847] [<c0262718>] (driver_probe_device) from 
[<c0262790>] (__driver_attach+0x60/0x84)
[   37.753601] [<c0262790>] (__driver_attach) from [<c0261070>] 
(bus_for_each_dev+0x50/0x84)
[   37.758422] [<c0261070>] (bus_for_each_dev) from [<c0261e20>] 
(bus_add_driver+0xac/0x1bc)
[   37.762207] [<c0261e20>] (bus_add_driver) from [<c02630c8>] 
(driver_register+0x9c/0xe0)
[   37.765899] [<c02630c8>] (driver_register) from [<c0008798>] 
(do_one_initcall+0x100/0x1b0)
[   37.769653] [<c0008798>] (do_one_initcall) from [<c0085ca4>] 
(do_init_module+0x34/0x158)
[   37.773590] [<c0085ca4>] (do_init_module) from [<c00868d8>] 
(SyS_init_module+0x54/0x64)
[   37.777252] [<c00868d8>] (SyS_init_module) from [<c000dbe0>] 
(ret_fast_syscall+0x0/0x30)
[   37.780975] ---[ end trace 86c3e025b92e700d ]---
[   37.784667] omap-aes 480c5000.aes: OMAP AES hw accel rev: 0.0
[   37.789794] of_dma_request_slave_channel: dma-names property 
of node '/ocp/aes@480c5000' missing or empty
[   37.797668] omap-aes 480c5000.aes: Unable to request in DMA 
channel
[   37.801391]    omap_aes_dma_init: error: -12

Error is not fatal, kernel does not crash and qemu emulation 
working fine. But error is there.

I'm sure that qemu does not support omap aes hw emulation and so 
I except error message about missing hw part (or something else). 
But not above unwind_backtrace error message.

Any idea why it happens? It is probably not related to AES but to 
DMA. It is for OMAP GP device (but emulated), so can TI comment 
this problem (as this is not HS under NDA)?

-- 
Pali Rohár
pali.rohar@gmail.com

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