Commit graph

88 commits

Author SHA1 Message Date
Guo Zhengkui
227fab1ee7 i3c: master: svc: fix returnvar.cocci warning
Fix the following coccicheck warning:

drivers/i3c/master/svc-i3c-master.c:1600:5-8:
Unneeded variable: "ret". Return "0" on line 1605.

Signed-off-by: Guo Zhengkui <guozhengkui@vivo.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20220504164901.9622-1-guozhengkui@vivo.com
2022-05-17 22:34:42 +02:00
Minghao Chi
c157a606e7 i3c/master: simplify the return expression of i3c_hci_remove()
Simplify the return expression.

Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Minghao Chi <chi.minghao@zte.com.cn>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20220505021954.54524-1-chi.minghao@zte.com.cn
2022-05-17 22:33:43 +02:00
Jamie Iles
6cbf8b38df i3c: fix uninitialized variable use in i2c setup
Commit 31b9887c72 ("i3c: remove i2c board info from i2c_dev_desc")
removed the boardinfo from i2c_dev_desc to decouple device enumeration from
setup but did not correctly lookup the i2c_dev_desc to store the new
device, instead dereferencing an uninitialized variable.

Lookup the device that has already been registered by address to store
the i2c client device.

Fixes: 31b9887c72 ("i3c: remove i2c board info from i2c_dev_desc")
Reported-by: kernel test robot <lkp@intel.com>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Jamie Iles <quic_jiles@quicinc.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20220308134226.1042367-1-quic_jiles@quicinc.com
2022-03-08 22:33:52 +01:00
Jamie Iles
72a4501b5d i3c: support dynamically added i2c devices
I2C devices can be added to the system dynamically through several
sources other than static board info including device tree overlays and
sysfs i2c new_device.

Add an I2C bus notifier to attach the clients at runtime if they were
not defined in the board info.  For DT devices find the LVR in the reg
property, for user-space new_device additions we synthesize a
conservative setting of no spike filters and fast mode only.

Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Jamie Iles <quic_jiles@quicinc.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20220117174816.1963463-3-quic_jiles@quicinc.com
2022-03-04 11:39:03 +01:00
Jamie Iles
31b9887c72 i3c: remove i2c board info from i2c_dev_desc
I2C board info is only required during adapter setup so there is no
requirement to keeping a pointer to it once running.  To support dynamic
device addition we can't rely on board info - user-space creation
through sysfs won't have a boardinfo.

Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Jamie Iles <quic_jiles@quicinc.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20220117174816.1963463-2-quic_jiles@quicinc.com
2022-03-04 11:39:03 +01:00
Tom Rix
13462ba181 i3c: master: dw: check return of dw_i3c_master_get_free_pos()
Clang static analysis reports this problem
dw-i3c-master.c:799:9: warning: The result of the left shift is
  undefined because the left operand is negative
                      COMMAND_PORT_DEV_INDEX(pos) |
                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~

pos can be negative because dw_i3c_master_get_free_pos() can return an
error.  So check for an error.

Fixes: 1dd728f5d4 ("i3c: master: Add driver for Synopsys DesignWare IP")
Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20220108150948.3988790-1-trix@redhat.com
2022-01-13 02:05:50 +01:00
Lukas Bulwahn
7a2bccd1a2 i3c: master: mipi-i3c-hci: correct the config reference for endianness
The referred config BIG_ENDIAN does not exist. The config for the
endianness of the CPU architecture is called CPU_BIG_ENDIAN.

Correct the config name to the existing config for the endianness.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Acked-by: Nicolas Pitre <npitre@baylibre.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20220103094504.3602-1-lukas.bulwahn@gmail.com
2022-01-05 09:54:54 +01:00
Clark Wang
7ff730ca45 i3c: master: svc: enable the interrupt in the enable ibi function
If enable interrupt in the svc_i3c_master_bus_init() but do not call
enable ibi in the device driver, it will cause a kernel dump in the
svc_i3c_master_handle_ibi() when a slave start occurs on the i3c bus,
because the data->ibi_pool is not initialized.
So only enable the interrupt in svc_i3c_master_enable_ibi() function.

Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211227074529.1660398-9-xiaoning.wang@nxp.com
2022-01-05 09:53:44 +01:00
Clark Wang
c5d4587bb9 i3c: master: svc: add the missing module device table
The missing MODULE_DEVICE_TABLE() will cause the svc-i3c-master cannot
be auto probed when it is built in moudle.
So add it.

Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Jun Li <jun.li@nxp.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211227074529.1660398-8-xiaoning.wang@nxp.com
2022-01-05 09:53:44 +01:00
Clark Wang
05be23ef78 i3c: master: svc: add runtime pm support
Add runtime pm support to dynamically manage the clock.

Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Jun Li <jun.li@nxp.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211227074529.1660398-7-xiaoning.wang@nxp.com
2022-01-05 09:53:44 +01:00
Clark Wang
173fcb2721 i3c: master: svc: set ODSTOP to let I2C device see the STOP signal
If using I2C/I3C mixed mode, need to set ODSTOP. Otherwise, the I2C
devices cannot see the stop signal. It may cause message sending errors.

Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Jun Li <jun.li@nxp.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211227074529.1660398-6-xiaoning.wang@nxp.com
2022-01-05 09:53:44 +01:00
Clark Wang
d5e512574d i3c: master: svc: add support for slave to stop returning data
When i3c controller reads data from slave device, slave device can stop
returning data with an ACK after any byte.
Add this support for svc i3c controller. Otherwise, it will timeout
when the slave device ends the read operation early.

Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
Reviewed-by: Jun Li <jun.li@nxp.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211227074529.1660398-5-xiaoning.wang@nxp.com
2022-01-05 09:53:44 +01:00
Clark Wang
9fd6b5ce85 i3c: master: svc: separate err, fifo and disable interrupt of reset function
Sometimes only need to reset err and fifo regs, so split the origin
reset function to three functions.
Put them at the top of the file, to let more functions can call them.

Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Jun Li <jun.li@nxp.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211227074529.1660398-4-xiaoning.wang@nxp.com
2022-01-05 09:53:44 +01:00
Clark Wang
a84a9222b2 i3c: master: svc: fix atomic issue
do_daa_locked() function is in a spin lock environment, use
readl_poll_timeout_atomic() to replace the origin
readl_poll_timeout().

Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Jun Li <jun.li@nxp.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211227074529.1660398-3-xiaoning.wang@nxp.com
2022-01-05 09:53:44 +01:00
Clark Wang
57d8d3fc06 i3c: master: svc: move module reset behind clk enable
Reset I3C module will R/W its regs, so enable its clocks first.

Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Jun Li <jun.li@nxp.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211227074529.1660398-2-xiaoning.wang@nxp.com
2022-01-05 09:53:44 +01:00
Christophe JAILLET
3f43926f27 i3c/master/mipi-i3c-hci: Fix a potentially infinite loop in 'hci_dat_v1_get_index()'
The code in 'hci_dat_v1_get_index()' really looks like a hand coded version
of 'for_each_set_bit()', except that a +1 is missing when searching for the
next set bit.

This really looks odd and it seems that it will loop until 'dat_w0_read()'
returns the expected result.

So use 'for_each_set_bit()' instead. It is less verbose and should be more
correct.

Fixes: 9ad9a52cce ("i3c/master: introduce the mipi-i3c-hci driver")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Acked-by: Nicolas Pitre <npitre@baylibre.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/0cdf3cb10293ead1acd271fdb8a70369c298c082.1637186628.git.christophe.jaillet@wanadoo.fr
2021-12-10 15:55:41 +01:00
Jamie Iles
f18f98110f i3c: fix incorrect address slot lookup on 64-bit
The address slot bitmap is an array of unsigned long's which are the
same size as an int on 32-bit platforms but not 64-bit.  Loading the
bitmap into an int could result in the incorrect status being returned
for a slot and slots being reported as the wrong status.

Fixes: 3a379bbcea ("i3c: Add core I3C infrastructure")
Cc: Boris Brezillon <bbrezillon@kernel.org>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Jamie Iles <quic_jiles@quicinc.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210922165600.179394-1-quic_jiles@quicinc.com
2021-12-10 15:54:46 +01:00
Len Baker
313ece2260 i3c/master/mipi-i3c-hci: Prefer kcalloc over open coded arithmetic
As noted in the "Deprecated Interfaces, Language Features, Attributes,
and Conventions" documentation [1], size calculations (especially
multiplication) should not be performed in memory allocator (or similar)
function arguments due to the risk of them overflowing. This could lead
to values wrapping around and a smaller allocation being made than the
caller was expecting. Using those allocations could lead to linear
overflows of heap memory and other misbehaviors.

So, use the purpose specific kcalloc() function instead of the argument
size * count in the kzalloc() function.

[1] https://www.kernel.org/doc/html/v5.14/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments

Signed-off-by: Len Baker <len.baker@gmx.com>
Acked-by: Nicolas Pitre <npitre@baylibre.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210912155135.7541-1-len.baker@gmx.com
2021-12-10 15:54:46 +01:00
Len Baker
f96b2e77f6 i3c/master/mipi-i3c-hci: Prefer struct_size over open coded arithmetic
As noted in the "Deprecated Interfaces, Language Features, Attributes,
and Conventions" documentation [1], size calculations (especially
multiplication) should not be performed in memory allocator (or similar)
function arguments due to the risk of them overflowing. This could lead
to values wrapping around and a smaller allocation being made than the
caller was expecting. Using those allocations could lead to linear
overflows of heap memory and other misbehaviors.

So, use the struct_size() helper to do the arithmetic instead of the
argument "size + count * size" in the kzalloc() function.

[1] https://www.kernel.org/doc/html/v5.14/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments

Signed-off-by: Len Baker <len.baker@gmx.com>
Acked-by: Nicolas Pitre <npitre@baylibre.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210905144054.5124-1-len.baker@gmx.com
2021-12-10 15:54:45 +01:00
Uwe Kleine-König
fc7a6209d5 bus: Make remove callback return void
The driver core ignores the return value of this callback because there
is only little it can do when a device disappears.

This is the final bit of a long lasting cleanup quest where several
buses were converted to also return void from their remove callback.
Additionally some resource leaks were fixed that were caused by drivers
returning an error code in the expectation that the driver won't go
away.

With struct bus_type::remove returning void it's prevented that newly
implemented buses return an ignored error code and so don't anticipate
wrong expectations for driver authors.

Reviewed-by: Tom Rix <trix@redhat.com> (For fpga)
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Cornelia Huck <cohuck@redhat.com> (For drivers/s390 and drivers/vfio)
Acked-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> (For ARM, Amba and related parts)
Acked-by: Mark Brown <broonie@kernel.org>
Acked-by: Chen-Yu Tsai <wens@csie.org> (for sunxi-rsb)
Acked-by: Pali Rohár <pali@kernel.org>
Acked-by: Mauro Carvalho Chehab <mchehab@kernel.org> (for media)
Acked-by: Hans de Goede <hdegoede@redhat.com> (For drivers/platform)
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-By: Vinod Koul <vkoul@kernel.org>
Acked-by: Juergen Gross <jgross@suse.com> (For xen)
Acked-by: Lee Jones <lee.jones@linaro.org> (For mfd)
Acked-by: Johannes Thumshirn <jth@kernel.org> (For mcb)
Acked-by: Johan Hovold <johan@kernel.org>
Acked-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> (For slimbus)
Acked-by: Kirti Wankhede <kwankhede@nvidia.com> (For vfio)
Acked-by: Maximilian Luz <luzmaximilian@gmail.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> (For ulpi and typec)
Acked-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com> (For ipack)
Acked-by: Geoff Levand <geoff@infradead.org> (For ps3)
Acked-by: Yehezkel Bernat <YehezkelShB@gmail.com> (For thunderbolt)
Acked-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> (For intel_th)
Acked-by: Dominik Brodowski <linux@dominikbrodowski.net> (For pcmcia)
Acked-by: Rafael J. Wysocki <rafael@kernel.org> (For ACPI)
Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org> (rpmsg and apr)
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> (For intel-ish-hid)
Acked-by: Dan Williams <dan.j.williams@intel.com> (For CXL, DAX, and NVDIMM)
Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com> (For isa)
Acked-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (For firewire)
Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> (For hid)
Acked-by: Thorsten Scherer <t.scherer@eckelmann.de> (For siox)
Acked-by: Sven Van Asbroeck <TheSven73@gmail.com> (For anybuss)
Acked-by: Ulf Hansson <ulf.hansson@linaro.org> (For MMC)
Acked-by: Wolfram Sang <wsa@kernel.org> # for I2C
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Finn Thain <fthain@linux-m68k.org>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20210713193522.1770306-6-u.kleine-koenig@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-07-21 11:53:42 +02:00
Linus Torvalds
88bbd8a031 I3C for 5.14
Drivers:
  - svc: two small fixes
 -----BEGIN PGP SIGNATURE-----
 
 iQIzBAABCgAdFiEEBqsFVZXh8s/0O5JiY6TcMGxwOjIFAmDo0P0ACgkQY6TcMGxw
 OjLWxA//R11pYCjXStl1hJnLJkvFahxTL4SQ/QPS6fW9K9BXnmt8cV7w65YFFuzf
 SbXVud00ybP2NDpcfNkmir/leLt0Q5mwJrkcG9MXm6XnprQB4VQehpV+lZe7SgRX
 cHvFpKFoG4p/4+CwWb7NDGm7r3GDzcdsx/pEaMmqnd2cK79ZAtZYcsf1VxythQCg
 CnSHFz7bNPzkAAsqVIaDNU0Beh4V4YsDlh9yxfvVT4fNNtG4HgOxD3uzXj09iDco
 KdZQ/Fj0WNpFzm2rO3GkFVabyscp5x/lPSeKjdPfoGuNdK7vqUUpRtF9sSLMIB7f
 nas8d+ybyqUNogPTPrUSJ8oTRiWDeAcL+QUY2T1V6QvkvpibkfQVPONUo7LX4+U8
 xNC8wQvWxKzakf4sCKClvir6PhWV5aq3WFnJtNIlYMXOEIQom85tHfUoTVRGP/nE
 sQGCaoS4/VyUWOF1y3LcSAxyMlulmIhDZj5OlQpAvpU+YguC2vMfU4h1aofDq/YB
 h2rUs6dWujf93gEhhuFCJSW8Dfi6fWEA3VoHYkgdMnBHBAQYjG8I5tWHRezXX48b
 Cp9tmPbVprqk6gW0EyoO7+c9x0n8MnKYNxpVQM9KQvqtkFCE7mt3QWuLR13gbfoO
 oVzGLYsOTCQOLlpm0LdvtXeIzW4woRtardddnvODJ69PtOGHPQ8=
 =iMi5
 -----END PGP SIGNATURE-----

Merge tag 'i3c/for-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux

Pull i3c updates from Alexandre Belloni:

 - two small fixes to the svc driver

* tag 'i3c/for-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux:
  i3c: master: svc: fix doc warning in svc-i3c-master.c
  i3c: master: svc: drop free_irq of devm_request_irq allocated irq
2021-07-10 11:53:06 -07:00
Gustavo A. R. Silva
ba3fea5472 i3c: master: cdns: Fix fall-through warning for Clang
In preparation to enable -Wimplicit-fallthrough for Clang, fix a warning
by explicitly adding a break statement instead of letting the code fall
through to the next case.

Link: https://github.com/KSPP/linux/issues/115
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
2021-06-29 08:37:04 -05:00
Yang Yingliang
3e5feb11a8 i3c: master: svc: fix doc warning in svc-i3c-master.c
Fix the following make W=1 warning:

  drivers/i3c/master/svc-i3c-master.c:207: warning: expecting prototype for struct svc_i3c_i3c_dev_data. Prototype was for struct svc_i3c_i2c_dev_data instead

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210602085544.4101980-1-yangyingliang@huawei.com
2021-06-09 02:02:45 +02:00
Yang Yingliang
59a61e69c4 i3c: master: svc: drop free_irq of devm_request_irq allocated irq
irq allocated with devm_request_irq() will be freed in devm_irq_release(),
using free_irq() in ->remove() will causes a dangling pointer, and a
subsequent double free. So remove the free_irq() in svc_i3c_master_remove().

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210602084935.3977636-1-yangyingliang@huawei.com
2021-06-09 02:02:22 +02:00
Jae Hyun Yoo
0d95f41ebd Revert "i3c master: fix missing destroy_workqueue() on error in i3c_master_register"
Adding the destroy_workqueue call in i3c_master_register introduced below
kernel warning because it makes duplicate destroy_workqueue calls when
i3c_master_register fails after allocating the workqueue. The workqueue will
be destroyed by i3c_masterdev_release which is called by put_device at the
end of the i3c_master_register function eventually in failure cases so the
workqueue doesn't need to be destroyed in i3c_master_register.

[    6.972952] WARNING: CPU: 1 PID: 1 at lib/list_debug.c:48 __list_del_entry_valid+0x9c/0xf4
[    6.982205] list_del corruption, 8fe03c08->prev is LIST_POISON2 (00000122)
[    6.989910] CPU: 1 PID: 1 Comm: swapper/0 Tainted: G        W         5.10.23-c12838a-dirty-31dc772 #1
[    7.000295] Hardware name: Generic DT based system
[    7.005638] Backtrace:
[    7.008369] [<809133f0>] (dump_backtrace) from [<80913644>] (show_stack+0x20/0x24)
[    7.016819]  r7:00000030 r6:60000013 r5:00000000 r4:813b5d40
[    7.023137] [<80913624>] (show_stack) from [<8091e1a0>] (dump_stack+0x9c/0xb0)
[    7.031201] [<8091e104>] (dump_stack) from [<8011fa30>] (__warn+0xf8/0x154)
[    7.038972]  r7:00000030 r6:00000009 r5:804fa1c8 r4:80b6eca4
[    7.045289] [<8011f938>] (__warn) from [<80913d14>] (warn_slowpath_fmt+0x8c/0xc0)
[    7.053641]  r7:00000030 r6:80b6eca4 r5:80b6ed74 r4:818cc000
[    7.059960] [<80913c8c>] (warn_slowpath_fmt) from [<804fa1c8>] (__list_del_entry_valid+0x9c/0xf4)
[    7.069866]  r9:96becf8c r8:818cc000 r7:8fe03c10 r6:8fe03c00 r5:8fe03ba0 r4:ff7ead4c
[    7.078513] [<804fa12c>] (__list_del_entry_valid) from [<8013f0b4>] (destroy_workqueue+0x1c4/0x23c)
[    7.088615] [<8013eef0>] (destroy_workqueue) from [<806aa124>] (i3c_masterdev_release+0x40/0xb0)
[    7.098421]  r7:00000000 r6:81a43b80 r5:8fe65360 r4:8fe65048
[    7.104740] [<806aa0e4>] (i3c_masterdev_release) from [<805f3f04>] (device_release+0x40/0xb0)
[    7.114254]  r5:00000000 r4:8fe65048
[    7.118245] [<805f3ec4>] (device_release) from [<808fe754>] (kobject_put+0xc8/0x204)
[    7.126885]  r5:813978dc r4:8fe65048
[    7.130877] [<808fe68c>] (kobject_put) from [<805f5fbc>] (put_device+0x20/0x24)
[    7.139037]  r7:8fe65358 r6:8fe65368 r5:8fe65358 r4:8fe65048
[    7.145355] [<805f5f9c>] (put_device) from [<806abac4>] (i3c_master_register+0x338/0xb00)
[    7.154487] [<806ab78c>] (i3c_master_register) from [<806ae084>] (dw_i3c_probe+0x224/0x24c)
[    7.163811]  r10:00000000 r9:8fe7a100 r8:00000032 r7:819fa810 r6:819fa800 r5:8fe65040
[    7.172547]  r4:00000000
[    7.175376] [<806ade60>] (dw_i3c_probe) from [<805fdc14>] (platform_drv_probe+0x44/0x80)
[    7.184409]  r9:813a25c0 r8:00000000 r7:815ec114 r6:00000000 r5:813a25c0 r4:819fa810
[    7.193053] [<805fdbd0>] (platform_drv_probe) from [<805fb83c>] (really_probe+0x108/0x50c)
[    7.202275]  r5:815ec004 r4:819fa810
[    7.206265] [<805fb734>] (really_probe) from [<805fc180>] (driver_probe_device+0xb4/0x190)
[    7.215492]  r10:813dc000 r9:80c4385c r8:000000d9 r7:813a25c0 r6:819fa810 r5:00000000
[    7.224228]  r4:813a25c0
[    7.227055] [<805fc0cc>] (driver_probe_device) from [<805fc5cc>] (device_driver_attach+0xb8/0xc0)
[    7.236959]  r9:80c4385c r8:000000d9 r7:813a25c0 r6:819fa854 r4:819fa810
[    7.244439] [<805fc514>] (device_driver_attach) from [<805fc65c>] (__driver_attach+0x88/0x16c)
[    7.254051]  r7:00000000 r6:819fa810 r5:00000000 r4:813a25c0
[    7.260369] [<805fc5d4>] (__driver_attach) from [<805f954c>] (bus_for_each_dev+0x88/0xc8)
[    7.269489]  r7:00000000 r6:818cc000 r5:805fc5d4 r4:813a25c0
[    7.275806] [<805f94c4>] (bus_for_each_dev) from [<805fc76c>] (driver_attach+0x2c/0x30)
[    7.284739]  r7:81397c98 r6:00000000 r5:8fe7db80 r4:813a25c0
[    7.291057] [<805fc740>] (driver_attach) from [<805f9eec>] (bus_add_driver+0x120/0x200)
[    7.299984] [<805f9dcc>] (bus_add_driver) from [<805fce44>] (driver_register+0x98/0x128)
[    7.309005]  r7:80c4383c r6:00000000 r5:00000000 r4:813a25c0
[    7.315323] [<805fcdac>] (driver_register) from [<805fedb4>] (__platform_driver_register+0x50/0x58)
[    7.325410]  r5:818cc000 r4:81397c98
[    7.329404] [<805fed64>] (__platform_driver_register) from [<80c23398>] (dw_i3c_driver_init+0x24/0x28)
[    7.339790]  r5:818cc000 r4:80c23374
[    7.343784] [<80c23374>] (dw_i3c_driver_init) from [<80c01300>] (do_one_initcall+0xac/0x1d0)
[    7.353206] [<80c01254>] (do_one_initcall) from [<80c01630>] (kernel_init_freeable+0x1a8/0x204)
[    7.362916]  r8:000000d9 r7:80c4383c r6:00000007 r5:819ca2c0 r4:80c67680
[    7.370398] [<80c01488>] (kernel_init_freeable) from [<8091eb18>] (kernel_init+0x18/0x12c)
[    7.379616]  r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:8091eb00
[    7.388343]  r4:00000000
[    7.391170] [<8091eb00>] (kernel_init) from [<80100148>] (ret_from_fork+0x14/0x2c)
[    7.399607] Exception stack(0x818cdfb0 to 0x818cdff8)
[    7.405243] dfa0:                                     00000000 00000000 00000000 00000000
[    7.414371] dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[    7.423499] dfe0: 00000000 00000000 00000000 00000000 00000013 00000000
[    7.430879]  r5:8091eb00 r4:00000000

This reverts commit 59165d16c6.

Fixes: 59165d16c6 ("i3c master: fix missing destroy_workqueue() on error in i3c_master_register")
Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210408172803.24599-1-jae.hyun.yoo@linux.intel.com
2021-04-24 22:21:01 +02:00
Colin Ian King
436cb709f8 i3c: master: svc: remove redundant assignment to cmd->read_len
The assignment of xfer_len to cmd->read_len appears to be redundant
as the next statement re-assigns the value 0 to it.  Clean up the
code by removing the redundant first assignment.

Addresses-Coverity: ("Unused value")
Fixes: dd3c52846d ("i3c: master: svc: Add Silvaco I3C master driver")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210224151349.202332-1-colin.king@canonical.com
2021-03-09 21:13:31 +01:00
Linus Torvalds
36c1b20d15 I3C for 5.12
Subsystem:
  - Handle drivers without probe or remove callback
  - Remove callback now returns void
  - DT documentation is now in yaml
 
 New driver:
  - Silvaco I3C master
 -----BEGIN PGP SIGNATURE-----
 
 iQIzBAABCgAdFiEEycoQi/giopmpPgB12wIijOdRNOUFAmAy+ycACgkQ2wIijOdR
 NOUDRg/+KPaE8MQMXh/YrnN4VXX+QZe8Yt5WynVThG8GGwDC0PrPtMcepwkd9GGA
 3EsBtuNVE7uvcUX59rmi2VrMlc6e3fRZ6g2Ub2vH5NXDZIeEXjbmq+vk6PlXNgKf
 k7LvVaQLkBCqsBoV1kraR7lPyi7rf2ZFFOYJuObj8yxADhmkpbRFQCbkWkeYGpMn
 2DN3cN2+jybmNBCh5SDDneJn/Bdr0/mBp0bLffOT+uAQ4bu6HbDOrlyZ9gY8rx8y
 TqbOT1JDhTCW0EC6IPw4SSkKXcew20XRmYSax4bx233cTCCjzsXG7vNHtv0KBide
 JlGvKEnE+WDfvPaSoxUjxtmwWfEki/qBzAZ3Mrs8/G9NRWRvE9qDU/x71hduog0g
 pqcRb0plreR7j3XusFaFu83HJtTfwHKVzWb12ExuNfzS4T/uZKs8vM0MFcedIRur
 wJg7+Qv+NGzGegELOaRkquc56x4IjXx+vYj3tbvnOrFdKgAuRU4YBn220QfYwI6d
 zx+6msuzIT/XroH6aq92Ds50hVLMQpNosuJPNsZto57hBShJgA6cmGMj79L9GldM
 CbdOu8ZBgHi4kpCWb9nunNqY0cctlQ0lEV6/1SYhCqRGLS7etS0IaUiWXNDge22N
 kzmeg5+RaA0AlAbzJHi+JOR6OnxxAhvZyys5nfQ4/X08R8JY9iY=
 =282r
 -----END PGP SIGNATURE-----

Merge tag 'i3c/for-5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux

Pull i3c update from Alexandre Belloni:
 "Subsystem:
   - Handle drivers without probe or remove callback
   - Remove callback now returns void
   - DT documentation is now in yaml

  New driver:
   - Silvaco I3C master"

* tag 'i3c/for-5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux:
  i3c: master: dw: Drop redundant disec call
  MAINTAINERS: Add Silvaco I3C master
  i3c: master: svc: Add Silvaco I3C master driver
  dt-bindings: i3c: Describe Silvaco master binding
  dt-bindings: Add vendor prefix for Silvaco
  dt-bindings: i3c: mipi-hci: Include the bus binding
  dt-bindings: i3c: Convert the bus description to yaml
  i3c: Make remove callback return void
  i3c: Handle drivers without probe or remove callback
  i3c/master/mipi-i3c-hci: Specify HAS_IOMEM dependency
2021-02-22 09:52:55 -08:00
Miquel Raynal
5c34b8e7e8 i3c: master: dw: Drop redundant disec call
Disabling all event calls is already handled by the core right before
starting the DAA process. Do not do it again when the DAA process
completes, it is redundant.

Fixes: 1dd728f5d4 ("i3c: master: Add driver for Synopsys DesignWare IP")
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20201228105501.6104-1-miquel.raynal@bootlin.com
2021-02-06 00:44:15 +01:00
Miquel Raynal
dd3c52846d i3c: master: svc: Add Silvaco I3C master driver
Add support for Silvaco I3C dual-role IP. The master role is supported
in SDR mode only. I2C transfers have not been tested but are shared
because they are very close to the I3C transfers in terms of register
configuration.

The IBI processing follows this logic:
- When a slave advertizes an interrupt (SDA pulled low) an interrupt
  gets generated by the master. This time is unbounded and may be
  deferred.
- The IRQ handler itself does not process anything: it only queues a
  work that will be run in non-atomic context. This is needed because
  short wait periods must be experienced.
- The IBI job is divided in two parts: the first one is "critical" in
  the sense that it may not support getting interrupted. If this
  happens, after this first section the driver checks the master error
  register and depending on its content either flushes everything and
  errors out, or ends the processing (this second section may be
  interrupted).
- If the critical section got interrupted, the slave will
  automatically respin it's IBI request when it will be allowed to.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210121101808.14654-6-miquel.raynal@bootlin.com
2021-02-06 00:43:29 +01:00
Uwe Kleine-König
dd9267034c i3c: Make remove callback return void
The driver core ignores the return value of struct bus_type::remove()
because there is only little that can be done. To simplify the quest to
make this function return void, let struct i3c_driver::remove() return
void, too. This makes it obvious that returning an error code is
a bad idea and future driver authors cannot get that wrong.

Up to now there are no drivers with a remove callback, so there is no
need to adapt drivers.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210128091048.17006-2-u.kleine-koenig@pengutronix.de
2021-02-02 00:16:57 +01:00
Uwe Kleine-König
7456fea589 i3c: Handle drivers without probe or remove callback
A registered driver without a probe callback doesn't make sense, so
refuse to register such a driver. (Otherwise i3c_device_probe() yields a
NULL pointer exception.)

A driver without remove is possible, e.g. when all resources are freed
using devm callbacks. So guard the call to driver->remove by a check
for being non-NULL.

Note that the only in-tree i3c driver
(drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i3c.c) doesn't have a remove
callback.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210128091048.17006-1-u.kleine-koenig@pengutronix.de
2021-02-02 00:16:57 +01:00
David Gow
9d909f1b1e i3c/master/mipi-i3c-hci: Specify HAS_IOMEM dependency
The MIPI i3c HCI driver makes use of IOMEM functions like
devm_platform_ioremap_resource(), which are only available if
CONFIG_HAS_IOMEM is defined.

This causes the driver to be enabled under make ARCH=um allyesconfig,
even though it won't build.

By adding a dependency on HAS_IOMEM, the driver will not be enabled on
architectures which don't support it.

Fixes: 9ad9a52cce ("i3c/master: introduce the mipi-i3c-hci driver")
Signed-off-by: David Gow <davidgow@google.com>
Acked-by: Nicolas Pitre <npitre@baylibre.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210127040636.1535722-1-davidgow@google.com
2021-02-01 23:39:17 +01:00
Nathan Chancellor
291b5c9870 i3c/master/mipi-i3c-hci: Fix position of __maybe_unused in i3c_hci_of_match
Clang warns:

 ../drivers/i3c/master/mipi-i3c-hci/core.c:780:21: warning: attribute
 declaration must precede definition [-Wignored-attributes]
 static const struct __maybe_unused of_device_id i3c_hci_of_match[] = {
                     ^
 ../include/linux/compiler_attributes.h:267:56: note: expanded from macro
 '__maybe_unused'
 #define __maybe_unused                  __attribute__((__unused__))
                                                        ^
 ../include/linux/mod_devicetable.h:262:8: note: previous definition is
 here
 struct of_device_id {
        ^
1 warning generated.

'struct of_device_id' should not be split, as it is a type. Move the
__maybe_unused attribute after the static and const qualifiers so that
there are no warnings about this variable, period.

Fixes: 95393f3e07 ("i3c/master/mipi-i3c-hci: quiet maybe-unused variable warning")
Link: https://github.com/ClangBuiltLinux/linux/issues/1221
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Acked-by: Nicolas Pitre <npitre@baylibre.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20201222025931.3043480-1-natechancellor@gmail.com
2020-12-31 18:41:37 +01:00
Nicolas Pitre
95393f3e07 i3c/master/mipi-i3c-hci: quiet maybe-unused variable warning
If CONFIG_OF is disabled then the matching table is notreferenced.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
2020-12-17 10:31:30 +01:00
Colin Ian King
8e3457372c i3c/master: Fix uninitialized variable next_addr
The variable next_addr is not initialized and is being used in a call
to i3c_master_get_free_addr as a starting point to find the next address.
Fix this by initializing next_addr to 0 to avoid an uninitialized garbage
starting address from being used.

Addresses-Coverity: ("Uninitialized scalar variable")
Fixes: 9ad9a52cce ("i3c/master: introduce the mipi-i3c-hci driver")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Nicolas Pitre <npitre@baylibre.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/linux-i3c/20201124123504.396249-1-colin.king@canonical.com
2020-11-25 11:02:43 +01:00
Nicolas Pitre
9ad9a52cce i3c/master: introduce the mipi-i3c-hci driver
This adds basic support for hardware implementing the MIPI I3C HCI
specification. This driver is currently limited by the capabilities
of the I3C subsystem, meaning things like scheduled commands,
auto-commands and NCM mode are not yet supported.

This supports version 1.0 of the MIPI I3C HCI spec, as well as the
imminent release of version 1.1. Support for draft version 2.0 of the
spec is also largely included with the caveat that future adjustments
to this code are likely as the spec is still a work in progress.

This is also lightly tested as actual hardware is still very scarce,
even for HCI v1.0. Hence the EXPERIMENTAL tag. Further contributions
to this driver are expected once vendor implementations and new I3C
devices become available.

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/linux-i3c/20201111220510.3622216-3-nico@fluxnic.net
2020-11-23 10:22:18 +01:00
Qinglang Miao
59165d16c6 i3c master: fix missing destroy_workqueue() on error in i3c_master_register
Add the missing destroy_workqueue() before return from
i3c_master_register in the error handling case.

Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/linux-i3c/20201028091543.136167-1-miaoqinglang@huawei.com
2020-11-23 10:22:16 +01:00
Linus Torvalds
2a934b38c0 * Fix DAA for the pre-reserved address case
* Fix an error path in the cadence driver
 -----BEGIN PGP SIGNATURE-----
 
 iQIzBAABCAAdFiEEKmCqpbOU668PNA69Ze02AX4ItwAFAl+Ko/gACgkQZe02AX4I
 twAcKg//d6FTKiiphDXB7o3cNIcfV+1bbOxxl0JTqIW1kaRXvCVA7L0KQDDttefW
 VyjJTDLU+A3xauuC9kEOJCbX+oO3CEKtBQ5IjAaVgHirtz8E0gqJ2YV6X9zkfF86
 A94Z2e4vK79OpvfFmn+odYx8iFbXWR3q5ip9vMXRzXxGYJU0UwjLNSulvA3wSVAI
 uZzWeuLPxZalPQpp544fx+8AB2vuFOKu80yrPZnIBPCtH4luLlIVOXR18VMEXwaC
 ZAT4QlMNzAbqEOWe4ZFrddoyqj7b/enAjUflGkBpb+ZcsKGHzEQKe7s5Fg5PiJfF
 aWmWDsUh6/8et8sx//RCS442s/ZMIDxEvwgbUe/U19z94yW80rTWC0mbJnpO8KsU
 9doNmkZpjygwCnxc2fj6Sa+PlZt69SqDArWj3KOk/5UMqTh7fRDbB8DuvsTEBCiX
 VKOHbk44Fqdaov6g4JAg/u073ZyvI6jjlbDPuPBUVi++hqCxXk7TZ1U16xgwOsyg
 qiASKtQwztLvvuyHYyQNhpV9yHvSxzzUJHbL/3V3FQkGtVRTPP5+5ctCbndY1C46
 im+o0nlS2OpkYyw8A0AQuI6rnypuerbcafPw1ruvSTaWv60OebneyD9mLJm5pO4D
 zs6XtAoyO99+IEKDz+mvVckTxaj8cyrO5pQhjbyQoIr5ZvE2OPM=
 =yC+2
 -----END PGP SIGNATURE-----

Merge tag 'i3c/for-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux

Pull i3c updates from Boris Brezillon:

 - Fix DAA for the pre-reserved address case

 - Fix an error path in the cadence driver

* tag 'i3c/for-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux:
  i3c: master: Fix error return in cdns_i3c_master_probe()
  i3c: master: fix for SETDASA and DAA process
  i3c: master add i3c_master_attach_boardinfo to preserve boardinfo
2020-10-17 11:01:01 -07:00
Jing Xiangfeng
abea14bfde i3c: master: Fix error return in cdns_i3c_master_probe()
Fix to return negative error code -ENOMEM from the error handling
case instead of 0.

Fixes: 603f2bee2c ("i3c: master: Add driver for Cadence IP")
Signed-off-by: Jing Xiangfeng <jingxiangfeng@huawei.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/linux-i3c/20200911033350.23904-1-jingxiangfeng@huawei.com
2020-10-07 15:14:07 +02:00
Parshuram Thombare
cc3a392d69 i3c: master: fix for SETDASA and DAA process
This patch fix following issue.
Controller slots blocked for devices with static_addr
but no init_dyn_addr may limit the number of I3C devices
on the bus which gets dynamic address in DAA. So
instead of attaching all the devices with static_addr,
now we only attach the devices which successfully
complete SETDASA. For remaining devices with init_dyn_addr,
i3c_master_add_i3c_dev_locked() will try to set requested
dynamic address after DAA.

Signed-off-by: Parshuram Thombare <pthombar@cadence.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/linux-i3c/1598337109-14770-1-git-send-email-pthombar@cadence.com
2020-09-14 09:05:58 +02:00
Gustavo A. R. Silva
df561f6688 treewide: Use fallthrough pseudo-keyword
Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary
fall-through markings when it is the case.

[1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
2020-08-23 17:36:59 -05:00
Parshuram Thombare
9da36a7ec4 i3c: master add i3c_master_attach_boardinfo to preserve boardinfo
Boardinfo was lost if I3C object for devices with boardinfo
available are not created or not added to the I3C device list
because of some failure e.g. SETDASA failed, retrieve info failed etc
This patch adds i3c_master_attach_boardinfo which scan boardinfo list
in the master object and 'attach' it to the I3C device object.

Fixes: 3a379bbcea ("i3c: Add core I3C infrastructure")
Signed-off-by: Parshuram Thombare <pthombar@cadence.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/linux-i3c/1590053542-389-1-git-send-email-pthombar@cadence.com
2020-08-19 09:29:56 +02:00
Nicolas Pitre
b4203ce055 i3c master: GETMRL's 3rd byte is optional even with BCR_IBI_PAYLOAD
According to the I3C spec v1.1 document, GETMRL's payload is 2 bytes,
with an optional 3rd byte if the IBI private payload is larger than
1 byte. The whole GETMRL may also be optional so max_ibi_len already
defaults to 1 if BCR_IBI_PAYLOAD prior to the i3c_master_getmrl_locked()
call.

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/linux-i3c/nycvar.YSQ.7.76.2004151623060.2671@knanqh.ubzr
2020-04-16 14:27:46 +02:00
Wolfram Sang
c4b9de11d0 i3c: convert to use i2c_new_client_device()
Move away from the deprecated API.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/linux-i3c/20200326211002.13241-2-wsa+renesas@sang-engineering.com
2020-03-29 10:35:50 +02:00
Gustavo A. R. Silva
cd851485ef i3c: master: Replace zero-length array with flexible-array member
The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:

struct foo {
        int stuff;
        struct boo array[];
};

By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.

Also, notice that, dynamic memory allocations won't be affected by
this change:

"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]

This issue was found with the help of Coccinelle.

[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 7649773293 ("cxgb3/l2t: Fix undefined behaviour")

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/linux-i3c/20200227131307.GA24935@embeddedor
2020-02-28 09:36:01 +01:00
Boris Brezillon
65ec1d0ddf i3c: Simplify i3c_device_match_id()
Simply match against ->match_flags instead of trying to be smart and
fix drivers inconsistent ID tables.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Vitor Soares <vitor.soares@synopsys.com>
Link: https://lore.kernel.org/linux-i3c/8c5d6523e1c161783db834a3447954f7fd6267e6.1582796652.git.vitor.soares@synopsys.com
2020-02-28 09:36:01 +01:00
Boris Brezillon
7ec0ddb007 i3c: Add a modalias sysfs attribute
Create a modalias sysfs attribute for i3c devices.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Vitor Soares <vitor.soares@synopsys.com>
Link: https://lore.kernel.org/linux-i3c/a90f64f830128cd12762153de7828b775574c156.1582796652.git.vitor.soares@synopsys.com
2020-02-28 09:35:52 +01:00
Boris Brezillon
12e21a23cc i3c: Fix MODALIAS uevents
file2alias uses %X formatters. Fix typos in the MODALIAS uevent to print
the part and ext IDs in uppercase.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Vitor Soares <vitor.soares@synopsys.com>
Link: https://lore.kernel.org/linux-i3c/9ac5f1f8413fbb0481de76b5e43f2f4e1b2dc49f.1582796652.git.vitor.soares@synopsys.com
2020-02-27 16:51:18 +01:00
Wolfram Sang
de8964995c i3c: master: no need to iterate master device twice
We already have the master device in a variable, reuse it.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Vitor Soares <vitor.soares@synopsys.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/linux-i3c/20200214145853.24762-1-wsa+renesas@sang-engineering.com
2020-02-17 23:13:43 +01:00
Vitor Soares
3952cf8ff2 i3c: master: dw: reattach device on first available location of address table
For today the reattach function only update the device address on the
controller.

Update the location to the first available too, will optimize the
enumeration process avoiding additional checks to keep the available
positions on address table consecutive.

Signed-off-by: Vitor Soares <vitor.soares@synopsys.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
2020-01-13 10:00:05 +01:00