| Commit message (Collapse) | Author | Age |
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Consider two threads calling read() on the same uinput-fd, both
non-blocking. Assume there is data-available so both will simultaneously
pass:
udev->head == udev->tail
Then the first thread goes to sleep and the second one pops the message
from the queue. Now assume udev->head == udev->tail. If the first thread
wakes up it will call wait_event_*() and sleep in the waitq. This
effectively turns the non-blocking FD into a blocking one.
We fix this by attempting to fetch events from the queue first and only
if we fail to retrieve any events we either return -EAGAIN (in case of
non-blocing read) or wait until there are more events.
This also fixes incorrect return code (we were returning 0 instead of
-EAGAIN for non-blocking reads) when an event is "stolen" by another
thread. Blocking reads will now continue to wait instead of returning 0
in this scenario.
Count of 0 continues to be a special case, as per spec: we will check for
device existence and whether there are events in the queue, but no events
will be actually retrieved.
Reported-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
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Let's check whether the user-supplied buffer is actually big enough and
return -EINVAL if it is not. This differs from current behavior, which
caused 0 to be returned and actually does not make any sense, as
broken application will simply repeat the read getting into endless
loop.
Note that we treat 0 as a special case, according to the standard:
"Before any action described below is taken, and if nbyte is zero,
the read() function may detect and return errors as described below.
In the absence of errors, or if error detection is not performed,
the read() function shall return zero and have no other results."
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
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When fetching events form device's buffer in uinput_read() we need to
take input device's event_lock to avoid racing with new event delivery.
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
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MATCH_BIT() is ugly and stupid, we have much nicer bitmap_subset() which
does the same and does not hide control flow.
Reported-by: Baodong Chen <chenbdchenbd@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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This adds devicetree bindings to the rotary encoder driver and some
documentation about how to use them. Tested on a PXA3xx platform.
Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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Drivers should not be changing platform data attached to the device
because they do not own it.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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Use gpio_request_one() instead of separate calls to gpio_request() and
gpio_direction_input() to simplify the code.
Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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Don't call gpio_to_irq() on GPIOs before gpio_request() succeeded on
them. This avoids Ooopses with incorrect DT bindings.
Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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Signed-off-by: Alexandre Pereira da Silva <aletes.xgr@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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Fixes for some coding style issues reported by scripts/checkpatch.pl
utility.
Signed-off-by: Baodong Chen <chenbdchenbd@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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As the power button causes a wake from suspend, we need to register
the event with the pm sustem to avoid racing with suspend.
As the input event is reported in the interrupt handler, as simple
pm_wakeup_event() is sufficient.
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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In order to avoid races with suspend, a wakeup event must register as
such by calling pm_wakeup_event() or pm_stay_awake(). This will ensure
that the current suspend cycle aborts.
When the user-space visible event is created in the interrupt handler
(gpio_keys_irq_isr), a simple pm_wakeup_event() with no delay is
sufficient as suspend will synchronise with all interrupt delivery.
When the user-space visible event is created later
(gpio_keys_gpio_isr), we need to bracket the event with
pm_stay_awake() and pm_relax().
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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- fix sizeof in memset;
- clean up dt properties extraction;
- use for_each_chil_of_node macro;
- use of_get_child_count();
- use of_match_ptr macro.
Signed-off-by: Alexandre Pereira da Silva <aletes.xgr@gmail.com>
Acked-by: Rob Herring <rob.herring@calxeda.com>
[Fabio Estevam <fabio.estevam@freescale.com>: fix fix NULL pointer
dereference for dt case - pdata->buttons wasn't initialized]
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
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If the ExpressKeys on the Intuos5 are touched, they currently result
an out-of-prox packet being sent even if the pad is already out of
prox. This can cause some confusion in the X driver. To restore the
expected semantics, we make being touched a sufficient condition to
signal proximity.
https://bugs.freedesktop.org/show_bug.cgi?id=54250
Reported-by: Timo Aaltonen <tjaalton@ubuntu.com>
Signed-off-by: Jason Gerecke <killertofu@gmail.com>
Reviewed-by: Chris Bagwell <chris@cnpbagwell.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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Commit c039450 (Input: synaptics - handle out of bounds values from the
hardware) caused any hardware reported values over 7167 to be treated as
a wrapped-around negative value. It turns out that some firmware uses
the value 8176 to indicate a finger near the edge of the touchpad whose
actual position cannot be determined. This value now gets treated as
negative, which can cause pointer jumps and broken edge scrolling on
these machines.
I only know of one touchpad which reports negative values, and this
hardware never reports any value lower than -8 (i.e. 8184). Moving the
threshold for treating a value as negative up to 8176 should work fine
then for any hardware we currently know about, and since we're dealing
with unspecified behavior it's probably the best we can do. The special
8176 value is also likely to result in sudden jumps in position, so
let's also clamp this to the maximum specified value for the axis.
BugLink: http://bugs.launchpad.net/bugs/1046512
https://bugzilla.kernel.org/show_bug.cgi?id=46371
Cc: stable@vger.kernel.org
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Tested-by: Alan Swanson <swanson@ukfsn.org>
Tested-by: Arteom <arutemus@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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copy_to_user() returns the number of bytes remaining, but we want a
negative error code here.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
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When lifing finger off the surface some versions of touchpad send movement
packets with very low coordinates, which cause cursor to jump to the upper
left corner of the screen. Let's ignore least significant bits of X and Y
coordinates if higher bits are all zeroes and consider finger not touching
the pad.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=43197
Reported-and-tested-by: Aleksey Spiridonov <leks13@leks13.ru>
Tested-by: Eddie Dunn <eddie.dunn@gmail.com>
Tested-by: Jakub Luzny <limoto94@gmail.com>
Tested-by: Olivier Goffart <olivier@woboq.com>
Signed-off-by: Tai-hwa Liang <avatar@sentelic.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
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Clocks must be prepared before enabling and unprepared
after disabling. Use appropriate functions to do this
in one go.
Signed-off-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
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On Toshiba Satellite C850D, the touchpad and the keyboard might randomly
not work at boot. Preventing MUX mode activation solves this issue.
Signed-off-by: Anisse Astier <anisse@astier.eu>
Cc: stable@kernel.org
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
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This reverts commit ca3b3faf9bee4dc5df4f10eae2d1e48f7de0a8ad.
There was a plan to place ab8500_irq_get_virq() calls in each AB8500
child device prior to requesting an IRQ, but as we're no longer using
Device Tree to collect our IRQ numbers, it's actually better to allow
the core to do this during device registration time. So the IRQ number
we pull from its resource has already been converted to a virtual IRQ.
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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Sync with mainline so that I can revert an input patch that came in through
another subsystem tree.
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git://git.linaro.org/people/mszyprowski/linux-dma-mapping
Pull DMA-mapping fixes from Marek Szyprowski:
"Another set of fixes for ARM dma-mapping subsystem.
Commit e9da6e9905e6 replaced custom consistent buffer remapping code
with generic vmalloc areas. It however introduced some regressions
caused by limited support for allocations in atomic context. This
series contains fixes for those regressions.
For some subplatforms the default, pre-allocated pool for atomic
allocations turned out to be too small, so a function for setting its
size has been added.
Another set of patches adds support for atomic allocations to
IOMMU-aware DMA-mapping implementation.
The last part of this pull request contains two fixes for Contiguous
Memory Allocator, which relax too strict requirements."
* 'fixes-for-3.6' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping:
ARM: dma-mapping: IOMMU allocates pages from atomic_pool with GFP_ATOMIC
ARM: dma-mapping: Introduce __atomic_get_pages() for __iommu_get_pages()
ARM: dma-mapping: Refactor out to introduce __in_atomic_pool
ARM: dma-mapping: atomic_pool with struct page **pages
ARM: Kirkwood: increase atomic coherent pool size
ARM: DMA-Mapping: print warning when atomic coherent allocation fails
ARM: DMA-Mapping: add function for setting coherent pool size from platform code
ARM: relax conditions required for enabling Contiguous Memory Allocator
mm: cma: fix alignment requirements for contiguous regions
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Make use of the same atomic pool as DMA does, and skip a kernel page
mapping which can involve sleep'able operations at allocating a kernel
page table.
Signed-off-by: Hiroshi Doyu <hdoyu@nvidia.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
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Support atomic allocation in __iommu_get_pages().
Signed-off-by: Hiroshi Doyu <hdoyu@nvidia.com>
[moved __atomic_get_pages() under #ifdef CONFIG_ARM_DMA_USE_IOMMU
to avoid unused fuction warning for no-IOMMU case]
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
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Check the given range("start", "size") is included in "atomic_pool" or not.
Signed-off-by: Hiroshi Doyu <hdoyu@nvidia.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
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struct page **pages is necessary to align with non atomic path in
__iommu_get_pages(). atomic_pool() has the intialized **pages instead
of just *page.
Signed-off-by: Hiroshi Doyu <hdoyu@nvidia.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
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The default 256 KiB coherent pool may be too small for some of the Kirkwood
devices, so increase it to make sure that devices will be able to allocate
their buffers with GFP_ATOMIC flag.
Suggested-by: Josh Coombs <josh.coombs@gmail.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Jason Cooper <jason@lakedaemon.net>
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Print a loud warning when system runs out of memory from atomic DMA
coherent pool to let users notice the potential problem.
Reported-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
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Some platforms might require to increase atomic coherent pool to make
sure that their device will be able to allocate all their buffers from
atomic context. This function can be also used to decrease atomic
coherent pool size if coherent allocations are not used for the given
sub-platform.
Suggested-by: Josh Coombs <josh.coombs@gmail.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
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Contiguous Memory Allocator requires only paging and MMU enabled not
particular CPU architectures, so there is no need for strict dependency
on CPU type. This enables to use CMA on some older ARM v5 systems which
also might need large contiguous blocks for the multimedia processing hw
modules.
Reported-by: Prabhakar Lad <prabhakar.lad@ti.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Prabhakar Lad <prabhakar.lad@ti.com>
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Contiguous Memory Allocator requires each of its regions to be aligned
in such a way that it is possible to change migration type for all
pageblocks holding it and then isolate page of largest possible order from
the buddy allocator (which is MAX_ORDER-1). This patch relaxes alignment
requirements by one order, because MAX_ORDER alignment is not really
needed.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
CC: Michal Nazarewicz <mina86@mina86.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
Pull input subsystem updates from Dmitry Torokhov.
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
Input: wacom - add support for EMR on Cintiq 24HD touch
Input: i8042 - add Gigabyte T1005 series netbooks to noloop table
Input: imx_keypad - reset the hardware before enabling
Input: edt-ft5x06 - fix build error when compiling wthout CONFIG_DEBUG_FS
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git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid
Pull HID updates from Jiri Kosina:
"It contains a fix for Eaton Ellipse MAX UPS from Alan Stern,
performance improvement (not processing debug data if noone is
interested), by Henrik Rydberg, and allowing tpkbd-driven devices to
work even with generic driver in a crippled mode, by Andres Freund."
* 'upstream-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid:
HID: tpkbd: work even if the new Lenovo Keyboard driver is not configured
HID: Only dump input if someone is listening
HID: add NOGET quirk for Eaton Ellipse MAX UPS
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c1dcad2d32d0252e8a3023d20311b52a187ecda3 added a new driver configured by
HID_LENOVO_TPKBD but made the hid_have_special_driver entry non-optional which
lead to a recognized but non-working device if the new driver wasn't
configured (which is the correct default).
Signed-off-by: Andres Freund <andres@anarazel.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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Going through the motions of printing the debug message information
takes a long time; using the keyboard can lead to a 160 us irqsoff
latency. This patch skips hid_dump_input() when there are no open
handles, which brings latency down to 100 us.
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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This patch (as1603) adds a NOGET quirk for the Eaton Ellipse MAX UPS
device. (The USB IDs were already present in hid-ids.h, apparently
under a different name.)
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reported-by: Laurent Bigonville <l.bigonville@edpnet.be>
CC: <stable@vger.kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen
Pull Xen bug-fixes from Konrad Rzeszutek Wilk:
* Fix for TLB flushing introduced in v3.6
* Fix Xen-SWIOTLB not using proper DMA mask - device had 64bit but
in a 32-bit kernel we need to allocate for coherent pages from a
32-bit pool.
* When trying to re-use P2M nodes we had a one-off error and triggered
a BUG_ON check with specific CONFIG_ option.
* When doing FLR in Xen-PCI-backend we would first do FLR then save the
PCI configuration space. We needed to do it the other way around.
* tag 'stable/for-linus-3.6-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
xen/pciback: Fix proper FLR steps.
xen: Use correct masking in xen_swiotlb_alloc_coherent.
xen: fix logical error in tlb flushing
xen/p2m: Fix one-off error in checking the P2M tree directory.
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When we do FLR and save PCI config we did it in the wrong order.
The end result was that if a PCI device was unbind from
its driver, then binded to xen-pciback, and then back to its
driver we would get:
> lspci -s 04:00.0
04:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network Connection
13:42:12 # 4 :~/
> echo "0000:04:00.0" > /sys/bus/pci/drivers/pciback/unbind
> modprobe e1000e
e1000e: Intel(R) PRO/1000 Network Driver - 2.0.0-k
e1000e: Copyright(c) 1999 - 2012 Intel Corporation.
e1000e 0000:04:00.0: Disabling ASPM L0s L1
e1000e 0000:04:00.0: enabling device (0000 -> 0002)
xen: registering gsi 48 triggering 0 polarity 1
Already setup the GSI :48
e1000e 0000:04:00.0: Interrupt Throttling Rate (ints/sec) set to dynamic conservative mode
e1000e: probe of 0000:04:00.0 failed with error -2
This fixes it by first saving the PCI configuration space, then
doing the FLR.
Reported-by: Ren, Yongjie <yongjie.ren@intel.com>
Reported-and-Tested-by: Tobias Geiger <tobias.geiger@vido.info>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
CC: stable@vger.kernel.org
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When running 32-bit pvops-dom0 and a driver tries to allocate a coherent
DMA-memory the xen swiotlb-implementation returned memory beyond 4GB.
The underlaying reason is that if the supplied driver passes in a
DMA_BIT_MASK(64) ( hwdev->coherent_dma_mask is set to 0xffffffffffffffff)
our dma_mask will be u64 set to 0xffffffffffffffff even if we set it to
DMA_BIT_MASK(32) previously. Meaning we do not reset the upper bits.
By using the dma_alloc_coherent_mask function - it does the proper casting
and we get 0xfffffffff.
This caused not working sound on a system with 4 GB and a 64-bit
compatible sound-card with sets the DMA-mask to 64bit.
On bare-metal and the forward-ported xen-dom0 patches from OpenSuse a coherent
DMA-memory is always allocated inside the 32-bit address-range by calling
dma_alloc_coherent_mask.
This patch adds the same functionality to xen swiotlb and is a rebase of the
original patch from Ronny Hegewald which never got upstream b/c the
underlaying reason was not understood until now.
The original email with the original patch is in:
http://old-list-archives.xen.org/archives/html/xen-devel/2010-02/msg00038.html
the original thread from where the discussion started is in:
http://old-list-archives.xen.org/archives/html/xen-devel/2010-01/msg00928.html
Signed-off-by: Ronny Hegewald <ronny.hegewald@online.de>
Signed-off-by: Stefano Panella <stefano.panella@citrix.com>
Acked-By: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
CC: stable@vger.kernel.org
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While TLB_FLUSH_ALL gets passed as 'end' argument to
flush_tlb_others(), the Xen code was made to check its 'start'
parameter. That may give a incorrect op.cmd to MMUEXT_INVLPG_MULTI
instead of MMUEXT_TLB_FLUSH_MULTI. Then it causes some page can not
be flushed from TLB.
This patch fixed this issue.
Reported-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Alex Shi <alex.shi@intel.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Tested-by: Yongjie Ren <yongjie.ren@intel.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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stable/for-linus-3.6
* commit '4cb38750d49010ae72e718d46605ac9ba5a851b4': (6849 commits)
bcma: fix invalid PMU chip control masks
[libata] pata_cmd64x: whitespace cleanup
libata-acpi: fix up for acpi_pm_device_sleep_state API
sata_dwc_460ex: device tree may specify dma_channel
ahci, trivial: fixed coding style issues related to braces
ahci_platform: add hibernation callbacks
libata-eh.c: local functions should not be exposed globally
libata-transport.c: local functions should not be exposed globally
sata_dwc_460ex: support hardreset
ata: use module_pci_driver
drivers/ata/pata_pcmcia.c: adjust suspicious bit operation
pata_imx: Convert to clk_prepare_enable/clk_disable_unprepare
ahci: Enable SB600 64bit DMA on MSI K9AGM2 (MS-7327) v2
[libata] Prevent interface errors with Seagate FreeAgent GoFlex
drivers/acpi/glue: revert accidental license-related 6b66d95895c bits
libata-acpi: add missing inlines in libata.h
i2c-omap: Add support for I2C_M_STOP message flag
i2c: Fall back to emulated SMBus if the operation isn't supported natively
i2c: Add SCCB support
i2c-tiny-usb: Add support for the Robofuzz OSIF USB/I2C converter
...
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We would traverse the full P2M top directory (from 0->MAX_DOMAIN_PAGES
inclusive) when trying to figure out whether we can re-use some of the
P2M middle leafs.
Which meant that if the kernel was compiled with MAX_DOMAIN_PAGES=512
we would try to use the 512th entry. Fortunately for us the p2m_top_index
has a check for this:
BUG_ON(pfn >= MAX_P2M_PFN);
which we hit and saw this:
(XEN) domain_crash_sync called from entry.S
(XEN) Domain 0 (vcpu#0) crashed on cpu#0:
(XEN) ----[ Xen-4.1.2-OVM x86_64 debug=n Tainted: C ]----
(XEN) CPU: 0
(XEN) RIP: e033:[<ffffffff819cadeb>]
(XEN) RFLAGS: 0000000000000212 EM: 1 CONTEXT: pv guest
(XEN) rax: ffffffff81db5000 rbx: ffffffff81db4000 rcx: 0000000000000000
(XEN) rdx: 0000000000480211 rsi: 0000000000000000 rdi: ffffffff81db4000
(XEN) rbp: ffffffff81793db8 rsp: ffffffff81793d38 r8: 0000000008000000
(XEN) r9: 4000000000000000 r10: 0000000000000000 r11: ffffffff81db7000
(XEN) r12: 0000000000000ff8 r13: ffffffff81df1ff8 r14: ffffffff81db6000
(XEN) r15: 0000000000000ff8 cr0: 000000008005003b cr4: 00000000000026f0
(XEN) cr3: 0000000661795000 cr2: 0000000000000000
Fixes-Oracle-Bug: 14570662
CC: stable@vger.kernel.org # only for v3.5
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
Pull PCI updates from Bjorn Helgaas:
"Power management
- PCI/PM: Enable D3/D3cold by default for most devices
- PCI/PM: Keep parent bridge active when probing device
- PCI/PM: Fix config reg access for D3cold and bridge suspending
- PCI/PM: Add ABI document for sysfs file d3cold_allowed
Core
- PCI: Don't print anything while decoding is disabled"
* tag '3.6-pci-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
PCI: Don't print anything while decoding is disabled
PCI/PM: Add ABI document for sysfs file d3cold_allowed
PCI/PM: Fix config reg access for D3cold and bridge suspending
PCI/PM: Keep parent bridge active when probing device
PCI/PM: Enable D3/D3cold by default for most devices
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If we try to print to the console device while its decoding is disabled,
the system will hang.
Reported-and-tested-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Olof Johansson <olof@lixom.net>
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This patch adds ABI document for the following sysfs file:
/sys/bus/pci/devices/.../d3cold_allowed
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
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This patch fixes the following bug:
http://marc.info/?l=linux-pci&m=134338059022620&w=2
Where lspci does not work properly if a device and the corresponding
parent bridge (such as PCIe port) is suspended. This is because the
device configuration space registers will be not accessible if the
corresponding parent bridge is suspended or the device is put into
D3cold state.
To solve the issue, the bridge/PCIe port connected to the device is
put into active state before read/write configuration space registers.
If the device is in D3cold state, it will be put into active state
too.
To avoid resume/suspend PCIe port for each configuration register
read/write, a small delay is added before the PCIe port to go
suspended.
Reported-by: Bjorn Mork <bjorn@mork.no>
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rafael J. Wysocki <rjw@sisk.pl>
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This patch fixes the following bug:
http://marc.info/?l=linux-pci&m=134329923124234&w=2
The root cause of the bug is as follow.
If a device is not bound with the corresponding driver, the device
runtime PM will be disabled and the device will be put into suspended
state. So that, the bridge/PCIe port connected to it may be put into
suspended and low power state. When do probing for the device later,
because the bridge/PCIe port connected to it is in low power state,
the IO access to device may fail.
To solve the issue, the bridge/PCIe port connected to the device is
put into active state before probing.
Reported-by: Bjorn Mork <bjorn@mork.no>
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rafael J. Wysocki <rjw@sisk.pl>
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This patch fixes the following bug:
http://marc.info/?l=linux-usb&m=134318961120825&w=2
Originally, device lower power states include D1, D2, D3. After that,
D3 is further divided into D3hot and D3cold. To support both scenario
safely, original D3 is mapped to D3cold.
When adding D3cold support, because worry about some device may have
broken D3cold support, D3cold is disabled by default. This disable D3
on original platform too. But some original platform may only have
working D3, but no working D1, D2. The root cause of the above bug is
it too.
To deal with this, this patch enables D3/D3cold by default for most
devices. This restores the original behavior. For some devices that
suspected to have broken D3cold support, such as PCIe port, D3cold is
disabled by default.
Reported-by: Bjorn Mork <bjorn@mork.no>
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rafael J. Wysocki <rjw@sisk.pl>
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