From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pali =?utf-8?q?Roh=C3=A1r?= <pali.rohar@gmail.com>
Subject: v3.19: Nokia N900 (qemu) - omap_aes error
Date: Sat, 31 Jan 2015 16:29:36 +0100
Message-ID: <201501311629.36431@pali>
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Cc: linux-kernel@vger.kernel.org, Pavel Machek <pavel@ucw.cz>, Sebastian Reichel <sre@kernel.org>, Aaro Koskinen <aaro.koskinen@iki.fi>, Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>, Tony Lindgren <tony@atomide.com>, Felipe Balbi <balbi@ti.com>, Nishanth Menon <nm@ti.com>
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Hello,

when I enable problematic omap_aes.ko driver (also in DT) for=20
Nokia N900 machine in qemu (it emulates OMAP GP device, not HS) I=20
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=20
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>]=20
(show_stack+0x10/0x14)
[   37.686920] [<c0010d44>] (show_stack) from [<c0032194>]=20
(warn_slowpath_common+0x84/0xac)
[   37.690765] [<c0032194>] (warn_slowpath_common) from=20
[<c003223c>] (warn_slowpath_fmt+0x2c/0x3c)
[   37.694366] [<c003223c>] (warn_slowpath_fmt) from [<c0020cb0>]=20
(_idle+0x28/0x64)
[   37.698791] [<c0020cb0>] (_idle) from [<c0021078>]=20
(omap_hwmod_idle+0x30/0x78)
[   37.702636] [<c0021078>] (omap_hwmod_idle) from [<c00222c4>]=20
(omap_device_idle+0x48/0x6c)
[   37.707153] [<c00222c4>] (omap_device_idle) from [<c0022304>]=20
(_od_runtime_suspend+0x1c/0x24)
[   37.710723] [<c0022304>] (_od_runtime_suspend) from=20
[<c0269680>] (__rpm_callback+0x8c/0xdc)
[   37.714385] [<c0269680>] (__rpm_callback) from [<c0269740>]=20
(rpm_callback+0x70/0x88)
[   37.717987] [<c0269740>] (rpm_callback) from [<c0269f74>]=20
(rpm_suspend+0x2e8/0x5a4)
[   37.721710] [<c0269f74>] (rpm_suspend) from [<c026a6ec>]=20
(__pm_runtime_idle+0x58/0x9c)
[   37.725402] [<c026a6ec>] (__pm_runtime_idle) from [<bf00129c>]=20
(omap_aes_probe+0x15c/0x448 [omap_aes])
[   37.733489] [<bf00129c>] (omap_aes_probe [omap_aes]) from=20
[<c0263d78>] (platform_drv_probe+0x48/0x90)
[   37.740936] [<c0263d78>] (platform_drv_probe) from=20
[<c02624ec>] (really_probe+0xac/0x1e0)
[   37.745025] [<c02624ec>] (really_probe) from [<c0262718>]=20
(driver_probe_device+0x30/0x48)
[   37.749847] [<c0262718>] (driver_probe_device) from=20
[<c0262790>] (__driver_attach+0x60/0x84)
[   37.753601] [<c0262790>] (__driver_attach) from [<c0261070>]=20
(bus_for_each_dev+0x50/0x84)
[   37.758422] [<c0261070>] (bus_for_each_dev) from [<c0261e20>]=20
(bus_add_driver+0xac/0x1bc)
[   37.762207] [<c0261e20>] (bus_add_driver) from [<c02630c8>]=20
(driver_register+0x9c/0xe0)
[   37.765899] [<c02630c8>] (driver_register) from [<c0008798>]=20
(do_one_initcall+0x100/0x1b0)
[   37.769653] [<c0008798>] (do_one_initcall) from [<c0085ca4>]=20
(do_init_module+0x34/0x158)
[   37.773590] [<c0085ca4>] (do_init_module) from [<c00868d8>]=20
(SyS_init_module+0x54/0x64)
[   37.777252] [<c00868d8>] (SyS_init_module) from [<c000dbe0>]=20
(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=20
of node '/ocp/aes@480c5000' missing or empty
[   37.797668] omap-aes 480c5000.aes: Unable to request in DMA=20
channel
[   37.801391]    omap_aes_dma_init: error: -12

Error is not fatal, kernel does not crash and qemu emulation=20
working fine. But error is there.

I'm sure that qemu does not support omap aes hw emulation and so=20
I except error message about missing hw part (or something else).=20
But not above unwind_backtrace error message.

Any idea why it happens? It is probably not related to AES but to=20
DMA. It is for OMAP GP device (but emulated), so can TI comment=20
this problem (as this is not HS under NDA)?

=2D-=20
Pali Roh=C3=A1r
pali.rohar@gmail.com

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