Phil Elwell [Wed, 21 Jun 2017 16:19:04 +0000 (17:19 +0100)]
serial: 8250: Fix THRE flag usage for CAP_MINI
The BCM2835 MINI UART has non-standard THRE semantics. Conventionally
the bit means that the FIFO is empty (although there may still be a
byte in the transmit register), but on 2835 it indicates that the FIFO
is not empty. This causes interrupts after every byte is transmitted,
with the FIFO providing some interrupt latency tolerance.
A consequence of this difference is that the usual strategy of writing
multiple bytes into the TX FIFO after checking THRE once is unsafe.
In the worst case of 7 bytes in the FIFO, writing 8 bytes loses all
but the first since by then the FIFO is full.
There is an HFIFO ("Hidden FIFO") bit which is almost what is needed,
but it only adds more bytes while both THRE and TEMT are set, i.e.
when the TX side is completely idle. This is unnecessarily pessimistic.
Add a new special case, predicated on CAP_MINI, that loops until THRE
is no longer set. With this change, the FIFO fills quickly but
subsequent writes are paced by the transmission rate.
Certain hub types do not discriminate between pipe direction (IN or OUT)
when considering non-periodic transfers. Therefore these hubs get confused
if multiple transfers are issued in different directions with the same
device address and endpoint number.
Constrain queuing non-periodic split transactions so they are performed
serially in such cases.
Eric Anholt [Mon, 5 Jun 2017 21:00:45 +0000 (14:00 -0700)]
drm/vc4: Add get/set tiling ioctls.
This allows mesa to set the tiling format for a BO and have that
tiling format be respected by mesa on the other side of an
import/export (and by vc4 scanout in the kernel), without defining a
protocol to pass the tiling through userspace.
Eric Anholt [Mon, 5 Jun 2017 19:16:10 +0000 (12:16 -0700)]
drm/vc4: Add T-format scanout support.
The T tiling format is what V3D uses for textures, with no raster
support at all until later revisions of the hardware (and always at a
large 3D performance penalty). If we can't scan out V3D's format,
then we often need to do a relayout at some stage of the pipeline,
either right before texturing from the scanout buffer (common in X11
without a compositor) or between a tiled screen buffer right before
scanout (an option I've considered in trying to resolve this
inconsistency, but which means needing to use the dirty fb ioctl and
having some update policy).
T-format scanout lets us avoid either of those shadow copies, for a
massive, obvious performance improvement to X11 window dragging
without a compositor. Unfortunately, enabling a compositor to work
around the discrepancy has turned out to be too costly in memory
consumption for the Raspbian distribution.
Because the HVS operates a scanline at a time, compositing from T does
increase the memory bandwidth cost of scanout. On my 1920x1080@32bpp
display on a RPi3, we go from about 15% of system memory bandwidth
with linear to about 20% with tiled. However, for X11 this still ends
up being a huge performance win in active usage.
This patch doesn't yet handle src_x/src_y offsetting within the tiled
buffer. However, we fail to do so for untiled buffers already.
Eric Anholt [Mon, 5 Jun 2017 21:00:45 +0000 (14:00 -0700)]
drm/vc4: Add get/set tiling ioctls.
This allows mesa to set the tiling format for a BO and have that
tiling format be respected by mesa on the other side of an
import/export (and by vc4 scanout in the kernel), without defining a
protocol to pass the tiling through userspace.
Eric Anholt [Mon, 5 Jun 2017 19:16:10 +0000 (12:16 -0700)]
drm/vc4: Add T-format scanout support.
The T tiling format is what V3D uses for textures, with no raster
support at all until later revisions of the hardware (and always at a
large 3D performance penalty). If we can't scan out V3D's format,
then we often need to do a relayout at some stage of the pipeline,
either right before texturing from the scanout buffer (common in X11
without a compositor) or between a tiled screen buffer right before
scanout (an option I've considered in trying to resolve this
inconsistency, but which means needing to use the dirty fb ioctl and
having some update policy).
T-format scanout lets us avoid either of those shadow copies, for a
massive, obvious performance improvement to X11 window dragging
without a compositor. Unfortunately, enabling a compositor to work
around the discrepancy has turned out to be too costly in memory
consumption for the Raspbian distribution.
Because the HVS operates a scanline at a time, compositing from T does
increase the memory bandwidth cost of scanout. On my 1920x1080@32bpp
display on a RPi3, we go from about 15% of system memory bandwidth
with linear to about 20% with tiled. However, for X11 this still ends
up being a huge performance win in active usage.
This patch doesn't yet handle src_x/src_y offsetting within the tiled
buffer. However, we fail to do so for untiled buffers already.
Andrei Gherzan [Mon, 5 Jun 2017 15:40:38 +0000 (16:40 +0100)]
dma-bcm2708: Fix module compilation of CONFIG_DMA_BCM2708
bcm2708-dmaengine.c defines functions like bcm_dma_start which are
defined as well in dma-bcm2708.h as inline versions when
CONFIG_DMA_BCM2708 is not defined. This works fine when
CONFIG_DMA_BCM2708 is built in, but when it is selected as module build
fails with redefinition errors because in the build system when
CONFIG_DMA_BCM2708 is selected as module, the macro becomes
CONFIG_DMA_BCM2708_MODULE.
This patch makes the header use CONFIG_DMA_BCM2708_MODULE too when
available.
Phil Elwell [Fri, 26 May 2017 12:03:41 +0000 (13:03 +0100)]
BCM270X_DT: Add midi-uart1 overlay
Add a scaler to the ttyS0 clock so that requesting 38400 baud results
in an approximately 31250 baud signal. This is analagous to
midi-uart0, except for ttyS0, which may be useful on Pi3 and also
may avoid an issue with ttyAMA0 failing to synchronise to an active
data stream.
cgroup_get() expected to be called only on live cgroups and triggers
warning on a dead cgroup; however, cgroup_sk_alloc() may be called
while cloning a socket which is left in an empty and removed cgroup
and thus may legitimately duplicate its reference on a dead cgroup.
This currently triggers the following warning spuriously.
This patch renames the existing cgroup_get() with the dead cgroup
warning to cgroup_get_live() after cgroup_kn_lock_live() and
introduces the new cgroup_get() which doesn't check whether the cgroup
is live or dead.
All existing cgroup_get() users except for cgroup_sk_alloc() are
converted to use cgroup_get_live().
Fixes: d979a39d7242 ("cgroup: duplicate cgroup reference when cloning sockets") Cc: stable@vger.kernel.org # v4.5+ Cc: Johannes Weiner <hannes@cmpxchg.org> Reported-by: Chris Mason <clm@fb.com> Signed-off-by: Tejun Heo <tj@kernel.org>
P33M [Fri, 26 May 2017 11:50:31 +0000 (12:50 +0100)]
dwc_otg: fiq_fsm: Make isochronous compatibility checks work properly
Get rid of the spammy printk and local pointer mangling.
Also, there is a nominal benefit for using fiq_fsm for isochronous
transfers in FS mode (~1.1k IRQs per second vs 2.1k IRQs per second)
so remove the root port speed check.
Phil Elwell [Wed, 31 May 2017 14:27:39 +0000 (15:27 +0100)]
BCM270X_DT: Improve i2c-sensor and i2c-rtc overlay
Use the "__dormant__" feature to permit multiple instances of each
overlay, which is more useful now that changing the "reg" property
also changes the node address. Although the overlay grows slightly,
when applied only the requested node is included.
Usage does not change, except that the "lm75addr" parameter of the
i2c-sensor overlay has been deprecated in favour of the generic
"addr" parameter.
P33M [Thu, 25 May 2017 15:04:53 +0000 (16:04 +0100)]
dwc_otg: make periodic scheduling behave properly for FS buses
If the root port is in full-speed mode, transfer times at 12mbit/s
would be calculated but matched against high-speed quotas.
Reinitialise hcd->frame_usecs[i] on each port enable event so that
full-speed bandwidth can be tracked sensibly.
Also, don't bother using the FIQ for transfers when in full-speed
mode - at the slower bus speed, interrupt frequency is reduced by
an order of magnitude.
Related issue: https://github.com/raspberrypi/linux/issues/2020
Tobias Jakobi [Sat, 25 Feb 2017 19:27:27 +0000 (20:27 +0100)]
HID: usbhid: extend polling interval configuration to joysticks
For mouse devices we can currently change the polling interval
via usbhid.mousepoll. Implement the same thing for joysticks, so
users can reduce input latency this way.
This has been tested with a Logitech RumblePad 2 with jspoll=2,
resulting in a polling rate of 500Hz (verified with evhz).
Phil Elwell [Mon, 22 May 2017 12:56:41 +0000 (13:56 +0100)]
clk: bcm2835: Minimise clock jitter for PCM clock
Fractional clock dividers generate accurate average frequencies but
with jitter, particularly when the integer divisor is small.
Introduce a new metric of clock accuracy to penalise clocks with a good
average but worse jitter compared to clocks with an average which is no
better but with lower jitter. The metric is the ideal rate minus the
worse deviation from that ideal using the nearest integer divisors.
Use this metric for parent selection for clocks requiring low jitter
(currently just PCM).
Without this I am getting the following messages at boot on my Trimslice:
tlv320aic23-codec 2-001a: Control not supported for path LLINEIN -> [NULL] -> Line Input
tlv320aic23-codec 2-001a: ASoC: no dapm match for LLINEIN --> NULL --> Line Input
tlv320aic23-codec 2-001a: ASoC: Failed to add route LLINEIN -> NULL -> Line Input
tlv320aic23-codec 2-001a: Control not supported for path RLINEIN -> [NULL] -> Line Input
tlv320aic23-codec 2-001a: ASoC: no dapm match for RLINEIN --> NULL --> Line Input
tlv320aic23-codec 2-001a: ASoC: Failed to add route RLINEIN -> NULL -> Line Input
tlv320aic23-codec 2-001a: Control not supported for path MICIN -> [NULL] -> Mic Input
tlv320aic23-codec 2-001a: ASoC: no dapm match for MICIN --> NULL --> Mic Input
tlv320aic23-codec 2-001a: ASoC: Failed to add route MICIN -> NULL -> Mic Input
tegra-snd-trimslice sound: tlv320aic23-hifi <-> 70002800.i2s mapping ok
Signed-off-by: Liviu Dudau <liviu@dudau.co.uk> Signed-off-by: Mark Brown <broonie@kernel.org>
Karl Palsson [Tue, 18 Mar 2014 23:33:27 +0000 (23:33 +0000)]
usb/serial/ch341: Add parity support
Based on wireshark packet traces from a windows machine.
ch340 and ch341 both seem to support all parity modes, but only the ch341
appears to support variable data bits and variable stop bits, so those are left
unimplemented, as before.
Tested on a generic usb-rs485 dongle with the chip label scratched off, and
some Modbus/RTU devices that required various parity settings.
Phil Elwell [Fri, 19 May 2017 14:07:27 +0000 (15:07 +0100)]
serial: 8250: Add CAP_MINI, set for bcm2835aux
The AUX/mini-UART in the BCM2835 family of procesors is a cut-down
8250 clone. In particular it is lacking support for the following
features: CSTOPB PARENB PARODD CMSPAR CS5 CS6
Add a new capability (UART_CAP_MINI) that exposes the restrictions to
the user of the termios API by turning off the unsupported features in
the request.
N.B. It is almost possible to automatically discover the missing
features by reading back the LCR register, but the CSIZE bits don't
cooperate (contrary to the documentation, both bits are significant,
but CS5 and CS6 are mapped to CS7) and the code is much longer.
Add an IrDA UART capability flag and change the type of
uart_8250_port.capabilities to be u32 rather than unsigned short to
accommodate the additional flag.
Signed-off-by: Ed Blake <ed.blake@imgtec.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Eric Anholt [Mon, 15 May 2017 18:35:13 +0000 (11:35 -0700)]
BCM270X: Drop position requirement for CMA in VC4 overlay.
No longer necessary since 2aefcd576195a739a7a256099571c9c4a401005f,
and will probably let peeople that want to choose a larger CMA
allocation (particularly on pi0/1).
P33M [Mon, 15 May 2017 13:51:42 +0000 (14:51 +0100)]
dwc_otg: remove unnecessary dma-mode channel halts on disconnect interrupt
Host channels are already halted in kill_urbs_in_qh_list() with the
subsequent interrupt processing behaving as if the URB was dequeued
via HCD callback.
There's no need to clobber the host channel registers a second time
as this exposes races between the driver and host channel resulting
in hcd->free_hc_list becoming corrupted.
P33M [Fri, 12 May 2017 11:24:00 +0000 (12:24 +0100)]
dwc_otg: fix several potential crash sources
On root port disconnect events, the host driver state is cleared and
in-progress host channels are forcibly stopped. This doesn't play
well with the FIQ running in the background, so:
- Guard the disconnect callback with both the host spinlock and FIQ
spinlock
- Move qtd dereference in dwc_otg_handle_hc_fsm() after the early-out
so we don't dereference a qtd that has gone away
- Turn catch-all BUG()s in dwc_otg_handle_hc_fsm() into warnings.
Phil Elwell [Thu, 11 May 2017 15:58:16 +0000 (16:58 +0100)]
BCM270X_DT: Tidy up mmc, sdhost, sdio overlays
The mmc, sdhost, sdio and sdio-1bit overlays had a few
anachronisms and oddities which were overdue for fixing.
The new versions should be functionally equivalent.
Nisar Sayed [Tue, 9 May 2017 17:51:42 +0000 (18:51 +0100)]
According to RFC 2460, IPv6 UDP calculated checksum yields a result
of zero must be changed to 0xffff, however this feature is not
supported by smsc95xx family hence enable csum offload only for
IPv4 TCP/UDP packets.
Phil Elwell [Mon, 8 May 2017 15:43:40 +0000 (16:43 +0100)]
irq_bcm2836: Send event when onlining sleeping cores
In order to reduce power consumption and bus traffic, it is sensible
for secondary cores to enter a low-power idle state when waiting to
be started. The wfe instruction causes a core to wait until an event
or interrupt arrives before continuing to the next instruction.
The sev instruction sends a wakeup event to the other cores, so call
it from bcm2836_smp_boot_secondary, the function that wakes up the
waiting cores during booting.
It is harmless to use this patch without the corresponding change
adding wfe to the ARMv7/ARMv8-32 stubs, but if the stubs are updated
and this patch is not applied then the other cores will sleep forever.
Phil Elwell [Mon, 8 May 2017 15:30:18 +0000 (16:30 +0100)]
ARM: dts: bcm283x: Reserve first page for firmware
The Raspberry Pi startup stub files for multi-core BCM27XX processors
make the secondary CPUs spin until the corresponding mailbox is
written. These stubs are loaded at physical address 0x00000xxx (as seen
by the ARMs), but this page will be reused by the kernel unless it is
explicitly reserved, causing the waiting cores to execute random code.
Use the /memreserve/ Device Tree directive to mark the first page as
off-limits to the kernel.
P33M [Thu, 4 May 2017 13:56:08 +0000 (14:56 +0100)]
fiq_fsm: Use correct states when starting isoc OUT transfers (#1991)
* fiq_fsm: Use correct states when starting isoc OUT transfers
In fiq_fsm_start_next_periodic() if an isochronous OUT transfer
was selected, no regard was given as to whether this was a single-packet
transfer or a multi-packet staged transfer.
For single-packet transfers, this had the effect of repeatedly sending
OUT packets with bogus data and lengths.
Eventually if the channel was repeatedly enabled enough times, this
would lock up the OTG core and no further bus transfers would happen.
Set the FSM state up properly if we select a single-packet transfer.
P33M [Tue, 2 May 2017 15:31:15 +0000 (16:31 +0100)]
dwc_otg: fix split transaction data toggle handling around dequeues
See https://github.com/raspberrypi/linux/issues/1709
Fix several issues regarding endpoint state when URBs are dequeued
- If the HCD is disconnected, flush FIQ-enabled channels properly
- Save the data toggle state for bulk endpoints if the last transfer
from an endpoint where URBs were dequeued returned a data packet
- Reset hc->start_pkt_count properly in assign_and_init_hc()
dwc_otg: make nak_holdoff work as intended with empty queues
If URBs reading from non-periodic split endpoints were dequeued and
the last transfer from the endpoint was a NAK handshake, the resulting
qh->nak_frame value was stale which would result in unnecessarily long
polling intervals for the first subsequent transfer with a fresh URB.
Fixup qh->nak_frame in dwc_otg_hcd_urb_dequeue and also guard against
a case where a single URB is submitted to the endpoint, a NAK was
received on the transfer immediately prior to receiving data and the
device subsequently resubmits another URB past the qh->nak_frame interval.
Phil Elwell [Wed, 26 Apr 2017 16:28:47 +0000 (17:28 +0100)]
clk: bcm2835: Limit PCM clock to OSC and PLLD_PER
It is unwise to use sources other than the oscillator and PLLD_PER for
the PCM peripheral (and perhaps others - TBD) because their rate can
change and they may even be switched off, so explicitly restrict the
choice using dummy entries in the list of potential parents (item index
is significant).
James Hughes [Wed, 19 Apr 2017 10:13:40 +0000 (11:13 +0100)]
smsc95xx: Use skb_cow_head to deal with cloned skbs
The driver was failing to check that the SKB wasn't cloned
before adding checksum data.
Replace existing handling to extend/copy the header buffer
with skb_cow_head.
Signed-off-by: James Hughes <james.hughes@raspberrypi.org> Acked-by: Eric Dumazet <edumazet@google.com> Acked-by: Woojung Huh <Woojung.Huh@microchip.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Boris Brezillon [Thu, 2 Feb 2017 10:37:36 +0000 (11:37 +0100)]
ARM: dts: bcm283x: Add HDMI audio related properties
Add the dmas and dma-names properties to support HDMI audio.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> Signed-off-by: Eric Anholt <eric@anholt.net>
(cherry picked from commit d46d2c6380c10e80e99f6af9067356128bffac6b)
Eric Anholt [Mon, 27 Feb 2017 20:28:02 +0000 (12:28 -0800)]
drm/vc4: Add HDMI audio support
The HDMI encoder IP embeds all needed blocks to output audio, with a
custom DAI called MAI moving audio between the two parts of the HDMI
core. This driver now exposes a sound card to let users stream audio
to their display.
Using the hdmi-codec driver has been considered here, but MAI meant
having to significantly rework hdmi-codec, and it would have left
little shared code with the I2S mode anyway.
The encoder requires that the audio be SPDIF-formatted frames only,
which alsalib will format-convert for us.
This patch is the combined work of Eric Anholt (initial register setup
with a separate dmaengine driver and using simple-audio-card) and
Boris Brezillon (moving it all into HDMI, massive debug to get it
actually working), and which Eric has the permission to release.
v2: Drop "-audio" from sound card name, since that's already implied
(suggestion by Boris)
Eric Anholt [Tue, 7 Mar 2017 22:51:03 +0000 (14:51 -0800)]
drm/vc4: Allow using more than 256MB of CMA memory.
Until now, we've had to limit Raspberry Pi to 256MB of CMA memory to
keep from triggering the hardware addressing bug between of the tile
binner of the tile alloc memory (where the top 4 bits come from the
tile state data array's address).
To work around that and allow more memory to be reserved for graphics,
allocate a single BO to store tile state data arrays and tile
alloc/overflow memory while the GPU is active, and make sure that that
one BO doesn't happen to cross a 256MB boundary. With that in place,
we can allocate textures and shaders anywhere in system memory (still
contiguous, of course).
BCM2708: Add Raspberry Pi TV HAT Device Tree Support
This is an EXAMPLE CODE of Raspberry Pi TV HAT device tree overlay.
Although this is not a part of our release code, it has been used to verify
CXD2880 device driver with TV HAT.
Add the following line to /boot/config.txt to enable TV HAT:
dtoverlay=rpi-tv
Reboot Raspberry Pi and check the existance of /proc/device-tree/soc/spi@7e204000/cxd2880@0.
If exists, the installation is successful. you should be able to find the following three files.
/dev/dvb/adapter0/frontend0
/dev/dvb/adapter0/demux0
/dev/dvb/adapter0/dvr0
This is the driver for Sony CXD2880 DVB-T2/T tuner + demodulator.
It includes the CXD2880 driver and the CXD2880 SPI adapter.
The current CXD2880 driver version is 1.4.1 - 1.0.1 released
on April 13, 2017.
Also improve code style and adhere to ALSA coding conventions.
Signed-off-by: Baswaraj K <jaikumar@cem-solutions.net> Reviewed-by: Vijay Kumar B. <vijaykumar@zilogic.com> Reviewed-by: Raashid Muhammed <raashidmuhammed@zilogic.com>
Matt Flax [Thu, 30 Mar 2017 00:43:57 +0000 (11:43 +1100)]
Audioinjector Octo : add extra sample rates, fix rst and use bcm270x regs
This patch adds new sample rates to the Audioinjector Octo sound card. The
new supported rates are (in kHz) :
96, 48, 32, 24, 16, 8, 88.2, 44.1, 29.4, 22.05, 14.7
This patch also replaces the regulators in the device tree overlay with
the ones declared in bcm270x.dtsi include file.
This patch also adds an extra codec reset and delay on probe.
Phil Elwell [Tue, 28 Mar 2017 16:41:30 +0000 (17:41 +0100)]
leds-gpio: Remove stray assignment to brightness_set
The brightness_set method is intended for use cases that must not
block, and can only be used if the GPIO provider can never sleep.
Remove an accidental initialisation (a copy-and-paste error) that
sets it regardless, which has been seen to cause crashes with the
gpio expander driver.
Phil Elwell [Tue, 28 Mar 2017 13:22:20 +0000 (14:22 +0100)]
BCM270X_DT: Allow multiple instances of w1-gpio overlays
Upcoming firmware will modify the address portion of node names when
their "reg" property is written by a dtparam. Modify the w1-gpio
overlays to write the gpiopin parameter value to "reg" properties, so
that multiple instances can be loaded simultaneously.
Note: The value of the "address" is unimportant - the w1 subsystem
assigns instance numbers to buses sequentially from 1, and it is
not necessary to know which bus a device is on in order to find it.
Raashid Muhammed [Mon, 27 Mar 2017 07:05:00 +0000 (12:35 +0530)]
Add support for Allo Piano DAC 2.1 plus add-on board for Raspberry Pi.
The Piano DAC 2.1 has support for 4 channels with subwoofer.
Signed-off-by: Baswaraj K <jaikumar@cem-solutions.net> Reviewed-by: Vijay Kumar B. <vijaykumar@zilogic.com> Reviewed-by: Raashid Muhammed <raashidmuhammed@zilogic.com>
Matt Flax [Mon, 27 Mar 2017 11:27:26 +0000 (22:27 +1100)]
AudioInjector Octo : Consolidate sample rates and add a codec reset.
This patch consolidates the sample rates which the audioinjector.net octo
sound card can use. The consolidation of sample rates are due to the
capabilities of the cs42448 codec.
This codec also requires a hard reset using the GPIO pin 5 upon probe.
Phil Elwell [Thu, 23 Mar 2017 16:34:46 +0000 (16:34 +0000)]
bcm2835-aux: Add aux interrupt controller
The AUX block has a shared interrupt line with a register indicating
which devices have active IRQs. Expose this as a nested interrupt
controller to avoid sharing problems.
Phil Elwell [Thu, 23 Mar 2017 10:06:56 +0000 (10:06 +0000)]
ASoC: Add prompt for ICS43432 codec
Without a prompt string, a config setting can't be included in a
defconfig. Give CONFIG_SND_SOC_ICS43432 a prompt so that Pi soundcards
can use the driver.
Dave Stevenson [Tue, 14 Mar 2017 14:23:06 +0000 (14:23 +0000)]
bcm2835-gpio-exp: Copy/paste error adding base twice
brcmexp_gpio_set was adding gpio->gc.base to the offset
twice, so passing an invalid number to the mailbox service.
The firmware treated it modulo-8 anyway, but was logging an
assert every time.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
Dave Stevenson [Tue, 7 Mar 2017 12:18:20 +0000 (12:18 +0000)]
BCM270X_DT: Invert Pi3 power LED to match fw change
Firmware expgpio driver reworked due to complaint over
hotplug detect.
Requires power LED to change sense as firmware is no longer
inverting the read value.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
The addresses of Wlan NIC registers are natural alignment, but some
drivers have bugs. These are evident on platforms that need natural
alignment to access registers. This change contains the following:
1. Function _rtl8821ae_dbi_read() is used to read one byte from DBI,
thus it should use rtl_read_byte().
2. Register 0x4C7 of 8192ee is single byte.
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com> Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net> Signed-off-by: Kalle Valo <kvalo@codeaurora.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
VSS may use a char device to support the communication between
the user level daemon and the driver. When the VSS channel is rescinded
we need to make sure that the char device is fully cleaned up before
we can process a new VSS offer from the host. Implement this logic.
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
projects / linux-4.9.git / log