From: Dudley Du <dudl@cypress.com>
To: Jeremiah Mahler <jmmahler@gmail.com>
CC: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [BUG] [PATCH] next: cyapa: fix inop touchpad after resume on Acer
 C720
Thread-Topic: [BUG] [PATCH] next: cyapa: fix inop touchpad after resume on
 Acer C720
Thread-Index: AQLRI7JC94tyVTJgY+eGfVWVB5Bb4JpwMGzQgAAIl1A=
Date: Wed, 26 Nov 2014 06:16:00 +0000
Message-ID: <af603da34acc4caca630ca58eda7eb1e@BN1PR06MB070.namprd06.prod.outlook.com>
References: <20141124085059.GA15770@hudson.localdomain>
 <20141125100703.GA9287@hudson.localdomain> 
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More info: I did all testings based on kernel 3.14.0 on Acer C70.

Thanks,
Dudley

> -----Original Message-----
> From: Dudley Du
> Sent: 2014?11?26? 14:01
> To: 'Jeremiah Mahler'
> Cc: 'linux-kernel@vger.kernel.org'
> Subject: RE: [BUG] [PATCH] next: cyapa: fix inop touchpad after resume on Acer
> C720
>
> Hi Jermiah,
>
> Does your code merged from chromiumos gerrit?
> If so, the patch you used seems very old, because the log shown the cyapa driver
> module name still be "cyapa", and it has already been changed to "cyapatp" for log
> time.
> Currently, I have already removed all old pathces from the gerrit system, now only
> v11 pathces existing in gerrit system.
> Could you please try to refetch again,
> or
> could you try the v11 patches that from
> http://patchwork.kernel.org/bundle/dudlx/input_cyapa_v11/
> or
> The attached zip file contians the v11 patches for chromiumos projects, same as
> currently existing in gerrit system.
> Besides the first and the latest patches which are specifical for chromionos, the
> reset pathces are exactly same as the cyapa v11 pathces that submitted to this
> kernel commuinty.
>
> Thanks,
> Dudley
>
> > -----Original Message-----
> > From: Jeremiah Mahler [mailto:jmmahler@gmail.com]
> > Sent: 2014?11?25? 18:07
> > To: Dudley Du
> > Cc: linux-kernel@vger.kernel.org
> > Subject: [BUG] [PATCH] next: cyapa: fix inop touchpad after resume on Acer C720
> >
> > On an Acer C720 running linux-next (20141124) the touchpad will become
> > inoperative after a resume.  Reloading the cyapa driver restores normal
> > operation.
> >
> > The following trace appeared in dmesg after a resume.
> >
> >   [   21.803878] ------------[ cut here ]------------
> >   [   21.803886] WARNING: CPU: 0 PID: 901 at kernel/irq/manage.c:444
> > enable_irq+0x3a/0x80()
> >   [   21.803886] Unbalanced enable for IRQ 0
> >   [   21.803927] Modules linked in: binfmt_misc bnep ecb ath3k btusb
> bluetooth
> > uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common
> > videodev media nfsd auth_rpcgss oid_registry nfs_acl nfs lockd grace fscache
> > sunrpc arc4 ath9k snd_hda_codec_hdmi ath9k_common ath9k_hw ath
> > tpm_infineon mac80211 i915 joydev x86_pkg_temp_thermal iTCO_wdt
> > intel_powerclamp cyapa iTCO_vendor_support intel_rapl iosf_mbi coretemp
> > kvm_intel kvm cfg80211 snd_hda_codec_realtek snd_hda_codec_generic
> > chromeos_laptop crct10dif_pclmul crc32_pclmul i2c_algo_bit crc32c_intel
> > snd_hda_intel drm_kms_helper xhci_pci xhci_hcd ghash_clmulni_intel
> > snd_hda_controller snd_hda_codec cryptd rfkill drm usbcore evdev pcspkr
> > snd_hwdep serio_raw snd_pcm i2c_i801 shpchp snd_timer usb_common lpc_ich
> > snd tpm_tis mfd_core video i2c_designware_pci
> >   [   21.803941]  tpm battery ac soundcore i2c_designware_platform
> > i2c_designware_core i2c_core processor button fuse autofs4 ext4 crc16 mbcache
> > jbd2 sg sd_mod ahci libahci libata scsi_mod fan thermal thermal_sys sdhci_acpi
> > sdhci mmc_core
> >   [   21.803945] CPU: 0 PID: 901 Comm: systemd-sleep Not tainted
> > 3.18.0-rc5-next-20141121 #50
> >   [   21.803946] Hardware name: Acer Peppy, BIOS          04/30/2014
> >   [   21.803949]  0000000000000000 ffffffff81725091 ffffffff81535c6c
> > ffff8800740cbc78
> >   [   21.803951]  ffffffff81069f61 ffff880100405400 0000000000000000
> > ffff88006c9c1c20
> >   [   21.803953]  ffff88006ae73220 0000000000000010 ffffffff81069fda
> > ffffffff8171bbb8
> >   [   21.803953] Call Trace:
> >   [   21.803959]  [<ffffffff81535c6c>] ? dump_stack+0x40/0x50
> >   [   21.803964]  [<ffffffff81069f61>] ? warn_slowpath_common+0x81/0xb0
> >   [   21.803967]  [<ffffffff81069fda>] ? warn_slowpath_fmt+0x4a/0x50
> >   [   21.803969]  [<ffffffff810b9792>] ? __irq_get_desc_lock+0x52/0x90
> >   [   21.803971]  [<ffffffff810bb32a>] ? enable_irq+0x3a/0x80
> >   [   21.803976]  [<ffffffffa0412535>] ? cyapa_resume+0x85/0xb0 [cyapa]
> >   [   21.803984]  [<ffffffffa01c3e90>] ? i2c_device_pm_thaw+0x40/0x40
> > [i2c_core]
> >   [   21.803988]  [<ffffffff813ce85a>] ? dpm_run_callback+0x4a/0x100
> >   [   21.803991]  [<ffffffff813cedd6>] ? device_resume+0xd6/0x210
> >   [   21.803994]  [<ffffffff813d02c9>] ? dpm_resume+0x109/0x2c0
> >   [   21.803997]  [<ffffffff813d07cd>] ? dpm_resume_end+0xd/0x20
> >   [   21.804000]  [<ffffffff810ae1e7>] ?
> > suspend_devices_and_enter+0x137/0x630
> >   [   21.804003]  [<ffffffff810aea32>] ? pm_suspend+0x352/0x3d0
> >   [   21.804005]  [<ffffffff810ad266>] ? state_store+0x76/0xf0
> >   [   21.804010]  [<ffffffff8122bd5c>] ? kernfs_fop_write+0x12c/0x180
> >   [   21.804013]  [<ffffffff811b78a2>] ? vfs_write+0xb2/0x1f0
> >   [   21.804015]  [<ffffffff811b8432>] ? SyS_write+0x42/0xb0
> >   [   21.804018]  [<ffffffff8153b6ad>] ? system_call_fastpath+0x16/0x1b
> >   [   21.804020] ---[ end trace 83d258439f6abe06 ]---
> >
> > Performing a bisect on the kernel revealed that the following commit
> > introduced the bug.
> >
> >   commit b1cfa7b4388285c0f0b486f152ab0cb18612c779
> >   Author: Dudley Du <dudley.dulixin@gmail.com>
> >   Date:   Sun Nov 9 12:36:34 2014 -0800
> >
> >       Input: cyapa - switch to using managed resources
> >
> >       Use of managed resources simplifies error handling and device removal
> > code.
> >
> >       Signed-off-by: Dudley Du <dudl@cypress.com>
> >       [Dmitry: added open/close methods so cyapa_remove is no longer
> needed.]
> >       Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
> >
> > The trace message "Unbalanced enable for IRQ 0" suggests there is a
> > problem with the interrupts.  Examing the patch which introduced the bug
> > revealed that the variable used to store the interrupt number was
> > changed from cyapa->irq to client->irq.  However, there was an old entry
> > in cyapa_resume() which wasn't updated and was trying to enable
> > interrupts using the old name.  Since it was undefined, it was trying to
> > enable irq 0, which produced the error.
> >
> > Fix the bug by using the correct variable name in cyapa_resume().
> >
> > Signed-off-by: Jeremiah Mahler <jmmahler@gmail.com>
> > ---
> >  drivers/input/mouse/cyapa.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/input/mouse/cyapa.c b/drivers/input/mouse/cyapa.c
> > index c84a9eb..d8d2ccb 100644
> > --- a/drivers/input/mouse/cyapa.c
> > +++ b/drivers/input/mouse/cyapa.c
> > @@ -964,7 +964,7 @@ static int __maybe_unused cyapa_resume(struct device
> > *dev)
> >  dev_warn(dev, "resume: set power mode to %d failed: %d\n",
> >   power_mode, error);
> >
> > -enable_irq(cyapa->irq);
> > +enable_irq(client->irq);
> >
> >  mutex_unlock(&input->mutex);
> >
> > --
> > 2.1.3
> >
> >
> > --
> > - Jeremiah Mahler

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