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a38c9166be
Because we can't gate the clock when using ufs, so we remove
UFSHCD_CAP_CLK_GATING support. However, ufshcd_runtime_suspend still
be called which can still call ufshcd_suspend->ufshcd_setup_clocks,
then ufshcd_setup_clocks() still tries to gate the clock which we
don't actually allow. Except for gating clock, ufshcd_suspend also send
H8 to the device. This rule is applied to system PM as well.
So the problem looks like:
[ T217] ueventd: restorecon_recursive: /sys/devices/platform/regulatory.0
[ T146] ufshcd-rockchip 2a2d0000.ufs: uic cmd 0x14 with arg3 0x0 completion timeout
[ T146] ufshcd-rockchip 2a2d0000.ufs: dme-reset: error code -110
Remove them together with UFSHCD_CAP_CLK_GATING.
BTW, no matter whether we call ufshcd_*_suspend/resume or not, wlun RPM
make sure all status come back:
[ 29.213545][ T146] Workqueue: pm pm_runtime_work
[ 29.213567][ T146] Call trace:
[ 29.213578][ T146] dump_backtrace+0xec/0x10c
[ 29.213598][ T146] show_stack+0x14/0x1c
[ 29.213616][ T146] dump_stack_lvl+0x68/0x88
[ 29.213631][ T146] dump_stack+0x14/0x34
[ 29.213644][ T146] ufshcd_hba_enable+0x32c/0x3b4
[ 29.213659][ T146] ufshcd_host_reset_and_restore+0x54/0x12c
[ 29.213674][ T146] ufshcd_reset_and_restore+0x60/0x1f8
[ 29.213693][ T146] __ufshcd_wl_resume+0xa0/0x4a8
[ 29.213710][ T146] ufshcd_wl_runtime_resume+0x38/0x154
[ 29.213726][ T146] scsi_runtime_resume+0x58/0x80
[ 29.213746][ T146] __rpm_callback+0x78/0x3bc
[ 29.213765][ T146] rpm_resume+0x434/0x670
[ 29.213782][ T146] __rpm_callback+0x1ac/0x3bc
[ 29.213799][ T146] rpm_resume+0x458/0x670
[ 29.213816][ T146] pm_runtime_work+0x9c/0xa0
[ 29.213833][ T146] process_one_work+0x1a4/0x3b0
[ 29.213847][ T146] worker_thread+0x258/0x428
[ 29.213861][ T146] kthread+0xe8/0x1b4
[ 29.213878][ T146] ret_from_fork+0x10/0x20
Fixes: 83dbc34b20 （“scsi: ufs: rockchip: Fix stability issues and add WB support”）
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Change-Id: I30fcdf35575a882b1095c5f991d82e429eccd1ce
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
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https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.