| Age | Commit message (Collapse) | Author | Files | Lines |
|---|
|
Currently SPI Cadence controller works only in Master mode.
Updated interrupt handler for Full duplex transfer in Slave mode.
Interrupt handler rely on the TX empty interrupt even for Slave mode
transfer due to below HW limitation.
HW limitation:
AR 65885 - SPI Controller Might Not Update RX_NEMPTY Flag, Showing
Incorrect Status Of The Receive FIFO
SPI Slave mode works in the following manner:
1. One transfer can be finished only after all transfer->len
data been transferred to master device.
2. Slave device only accepts transfer->len data. Any data longer
than this from master device will be dropped. Any data shorter than
this from master will cause SPI to be stuck due to the above behavior.
3. The stale data present in RXFIFO will be dropped in unprepared
hardware transfer function.
Signed-off-by: Srinivas Goud <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
Replace spi_master structure with spi_controller structure.
spi_controller structure provides interface support for
both SPI master and slave controller.
Signed-off-by: Srinivas Goud <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
The cadence QSPI driver misbehaves after performing a full system suspend
resume:
...
spi-nor spi0.0: resume() failed
...
This results in a flash connected via OSPI interface after system suspend-
resume to be unusable.
fix these suspend and resume functions.
Fixes: 140623410536 ("mtd: spi-nor: Add driver for Cadence Quad SPI Flash Controller")
Signed-off-by: Dhruva Gole <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
Merge series from Sai Krishna Potthuri <[email protected]>:
Update Xilinx Versal external DMA read logic to fix random issues
- Instead of having the fixed timeout, update the read timeout based on
the length of the transfer to avoid timeout for larger data size.
- While switching between external DMA read and indirect read, disable the
SPI before configuration and enable it after configuration as recommended
by Octal-SPI Flash Controller specification.
Sai Krishna Potthuri (2):
spi: cadence-quadspi: Update the read timeout based on the length
spi: cadence-quadspi: Disable the SPI before reconfiguring
drivers/spi/spi-cadence-quadspi.c | 40 ++++++++++++++++++-------------
1 file changed, 24 insertions(+), 16 deletions(-)
--
2.25.1
|
|
The AMD Pensando Elba SoC includes a DW apb_ssi v4 controller
with device specific chip-select control. The Elba SoC
provides four chip-selects where the native DW IP supports
two chip-selects. The Elba DW_SPI instance has two native
CS signals that are always overridden.
Signed-off-by: Brad Larson <[email protected]>
Reviewed-by: Serge Semin <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
Observed random DMA timeout failures while doing back to back
transfers which involves switching the modes from DMA to NON-DMA.
This issue is observed while testing the OSPI+UBIFS file system test case
where rootfs is mounted from OSPI UBIFS partition.
To avoid this issue, disable the SPI before changing the configuration
from external DMA to NON-DMA and vice versa and reenable it after changing
the configuration.
As per the Cadence Octal SPI design specification, it is recommended to
disable the Octal-SPI enable bit before reconfiguring.
Signed-off-by: Sai Krishna Potthuri <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
When performing indirect read via external DMA the timeout for
completion is set equal to the read length instead of fixed timeout value.
For reads larger than 500 bytes, the timeout will continue to be
equal to the read length whereas for a small read like the Read Status
Register command, the timeout would be 1 or 2 milliseconds. This is not
enough to cover the overhead needed in setting up DMA, in that case make
sure the timeout is at least 500ms to allow DMA to finish. This solution
is inline with the timeout used for Direct read via DMA.
Signed-off-by: Sai Krishna Potthuri <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux
Pull devicetree fixes from Rob Herring:
- Fix interaction between fw_devlink and DT overlays causing devices to
not be probed
- Fix the compatible string for loongson,cpu-interrupt-controller
* tag 'devicetree-fixes-for-6.2-3' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux:
treewide: Fix probing of devices in DT overlays
dt-bindings: interrupt-controller: loongarch: Fix mismatched compatible
|
|
SPI test framework is designed to run each test case for
a list of lengths.
Introduce a module parameter to limit the iterations
to a single value among the list of lengths.
Signed-off-by: Rohit Ner <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
When loading a DT overlay that creates a device, the device is not
probed, unless the DT overlay is unloaded and reloaded again.
After the recent refactoring to improve fw_devlink, it no longer depends
on the "compatible" property to identify which device tree nodes will
become struct devices. fw_devlink now picks up dangling consumers
(consumers pointing to descendent device tree nodes of a device that
aren't converted to child devices) when a device is successfully bound
to a driver. See __fw_devlink_pickup_dangling_consumers().
However, during DT overlay, a device's device tree node can have
sub-nodes added/removed without unbinding/rebinding the driver. This
difference in behavior between the normal device instantiation and
probing flow vs. the DT overlay flow has a bunch of implications that
are pointed out elsewhere[1]. One of them is that the fw_devlink logic
to pick up dangling consumers is never exercised.
This patch solves the fw_devlink issue by marking all DT nodes added by
DT overlays with FWNODE_FLAG_NOT_DEVICE (fwnode that won't become
device), and by clearing the flag when a struct device is actually
created for the DT node. This way, fw_devlink knows not to have
consumers waiting on these newly added DT nodes, and to propagate the
dependency to an ancestor DT node that has the corresponding struct
device.
Based on a patch by Saravana Kannan, which covered only platform and spi
devices.
[1] https://lore.kernel.org/r/CAGETcx_bkuFaLCiPrAWCPQz+w79ccDp6=9e881qmK=vx3hBMyg@mail.gmail.com
Fixes: 4a032827daa89350 ("of: property: Simplify of_link_to_phandle()")
Link: https://lore.kernel.org/r/CAGETcx_+rhHvaC_HJXGrr5_WAd2+k5f=rWYnkCZ6z5bGX-wj4w@mail.gmail.com
Signed-off-by: Geert Uytterhoeven <[email protected]>
Acked-by: Mark Brown <[email protected]>
Acked-by: Wolfram Sang <[email protected]> # for I2C
Acked-by: Shawn Guo <[email protected]>
Acked-by: Saravana Kannan <[email protected]>
Tested-by: Ivan Bornyakov <[email protected]>
Link: https://lore.kernel.org/r/e1fa546682ea4c8474ff997ab6244c5e11b6f8bc.1680182615.git.geert+renesas@glider.be
Signed-off-by: Rob Herring <[email protected]>
|
|
This is a driver for the Amlogic SPI flash controller support
on A113L SoC.
Signed-off-by: Martin Kurbanov <[email protected]>
Reviewed-by: Neil Armstrong <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
This helper does not produce a real modalias, but tries to get the
"product" compatible part of the "vendor,product" compatibles only. It
is far from creating a purely useful modalias string and does not seem
to be used like that directly anyway, so let's try to give this helper a
more meaningful name before moving there a real modalias helper (already
existing under of/device.c).
Also update the various documentations to refer to the strings as
"aliases" rather than "modaliases" which has a real meaning in the Linux
kernel.
There is no functional change.
Cc: Rafael J. Wysocki <[email protected]>
Cc: Len Brown <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: Thomas Zimmermann <[email protected]>
Cc: Sebastian Reichel <[email protected]>
Cc: Wolfram Sang <[email protected]>
Cc: Mark Brown <[email protected]>
Signed-off-by: Miquel Raynal <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Acked-by: Mark Brown <[email protected]>
Signed-off-by: Srinivas Kandagatla <[email protected]>
Acked-by: Sebastian Reichel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
|
|
Merge series from Tharun Kumar P <[email protected]>:
This patch series fixes the following bugs in spi-pci1xxxx driver:
1. Length of SPI transactions is improper
2. SPI transactions fail after suspend and resume
3. Incorrect implementation of pci1xxxx_spi_set_cs API
|
|
The verification is already do in the SPI core by function
__spi_validate(), not it to check it again in fsl_spi_bufs().
Signed-off-by: Christophe Leroy <[email protected]>
Link: https://lore.kernel.org/r/9ace69a8085e22fafd9159e99edd7bbfae2f9940.1680371809.git.christophe.leroy@csgroup.eu
Signed-off-by: Mark Brown <[email protected]>
|
|
mspi_apply_cpu_mode_quirks() always returns the passed bits_per_word
unmodified.
Make it return void, then don't check bits_per_word anymore on
return as it doesn't change.
bits_per_word is already checked by __spi_validate() so no risk to
have bits_per_word higher than 32.
Signed-off-by: Christophe Leroy <[email protected]>
Link: https://lore.kernel.org/r/3142a7c40af12a160f4e134764f2c34da3d8e1e2.1680371809.git.christophe.leroy@csgroup.eu
Signed-off-by: Mark Brown <[email protected]>
|
|
On CPM, the RISC core is a lot more efficiant when doing transfers
in 16-bits chunks than in 8-bits chunks, but unfortunately the
words need to be byte swapped as seen in a previous commit.
So, for large tranfers with an even size, allocate a temporary tx
buffer and byte-swap data before and after transfer.
This change allows setting higher speed for transfer. For instance
on an MPC 8xx (CPM1 comms RISC processor), the documentation tells
that transfer in byte mode at 1 kbit/s uses 0.200% of CPM load
at 25 MHz while a word transfer at the same speed uses 0.032%
of CPM load. This means the speed can be 6 times higher in
word mode for the same CPM load.
For the time being, only do it on CPM1 as there must be a
trade-off between the CPM load reduction and the CPU load required
to byte swap the data.
Signed-off-by: Christophe Leroy <[email protected]>
Link: https://lore.kernel.org/r/f2e981f20f92dd28983c3949702a09248c23845c.1680371809.git.christophe.leroy@csgroup.eu
Signed-off-by: Mark Brown <[email protected]>
|
|
For different reasons, fsl-spi driver performs bits_per_word
modifications for different reasons:
- On CPU mode, to minimise amount of interrupts
- On CPM/QE mode to work around controller byte order
For CPU mode that's done in fsl_spi_prepare_message() while
for CPM mode that's done in fsl_spi_setup_transfer().
Reunify all of it in fsl_spi_prepare_message(), and catch
impossible cases early through master's bits_per_word_mask
instead of returning EINVAL later.
Signed-off-by: Christophe Leroy <[email protected]>
Link: https://lore.kernel.org/r/0ce96fe96e8b07cba0613e4097cfd94d09b8919a.1680371809.git.christophe.leroy@csgroup.eu
Signed-off-by: Mark Brown <[email protected]>
|
|
CPM has the same problem as QE so for CPM also use the fix added
by commit 0398fb70940e ("spi/spi_mpc8xxx: Fix QE mode Litte Endian"):
CPM mode uses Little Endian so words > 8 bits are byte swapped.
Workaround this by always enforcing wordsize 8 for 16 and 32 bits
words. Unfortunately this will not work for LSB transfers
where wordsize is > 8 bits so disable these for now.
Also limit the workaround to 16 and 32 bits words because it can
only work for multiples of 8-bits.
Signed-off-by: Christophe Leroy <[email protected]>
Cc: Joakim Tjernlund <[email protected]>
Fixes: 0398fb70940e ("spi/spi_mpc8xxx: Fix QE mode Litte Endian")
Link: https://lore.kernel.org/r/1b7d3e84b1128f42c1887dd2fb9cdf390f541bc1.1680371809.git.christophe.leroy@csgroup.eu
Signed-off-by: Mark Brown <[email protected]>
|
|
Hardware does not have support to disable individual chip select lines.
Disable all chip select lines by using SPI_FORCE_CE bit.
Fixes: 1cc0cbea7167 ("spi: microchip: pci1xxxx: Add driver for SPI controller of PCI1XXXX PCIe switch")
Signed-off-by: Tharun Kumar P <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
pci1xxxx_spi_resume API masks SPI interrupt bit which prohibits interrupt
from coming to the host at the end of the transaction after suspend-resume.
This patch unmasks this bit at resume.
Fixes: 1cc0cbea7167 ("spi: microchip: pci1xxxx: Add driver for SPI controller of PCI1XXXX PCIe switch")
Signed-off-by: Tharun Kumar P <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
In pci1xxxx_spi_transfer_one API, length of SPI transaction gets cleared
by setting of length mask. Set length of transaction only after masking
length field.
Fixes: 1cc0cbea7167 ("spi: microchip: pci1xxxx: Add driver for SPI controller of PCI1XXXX PCIe switch")
Signed-off-by: Tharun Kumar P <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
Merge series from Uwe Kleine-König <[email protected]>:
After fixing the error handling in the .remove() callback of the qup
driver, convert it to .remove_new() preparing to make platform driver's
remove functions return void.
|
|
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is (mostly) ignored
and this typically results in resource leaks. To improve here there is a
quest to make the remove callback return void. In the first step of this
quest all drivers are converted to .remove_new() which already returns
void.
Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.
Signed-off-by: Uwe Kleine-König <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
According to commit 890cc39a8799 ("drivers: provide
devm_platform_get_and_ioremap_resource()"), convert
platform_get_resource(), devm_ioremap_resource() to a single
call to devm_platform_get_and_ioremap_resource(), as this is exactly
what this function does.
Signed-off-by: Yang Li <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
According to commit 890cc39a8799 ("drivers: provide
devm_platform_get_and_ioremap_resource()"), convert
platform_get_resource(), devm_ioremap_resource() to a single
call to devm_platform_get_and_ioremap_resource(), as this is exactly
what this function does.
Signed-off-by: Yang Li <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
According to commit 890cc39a8799 ("drivers: provide
devm_platform_get_and_ioremap_resource()"), convert
platform_get_resource(), devm_ioremap_resource() to a single
call to devm_platform_get_and_ioremap_resource(), as this is exactly
what this function does.
Signed-off-by: Yang Li <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
According to commit 890cc39a8799 ("drivers: provide
devm_platform_get_and_ioremap_resource()"), convert
platform_get_resource(), devm_ioremap_resource() to a single
call to devm_platform_get_and_ioremap_resource(), as this is exactly
what this function does.
Signed-off-by: Yang Li <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
When using gpio based chip select the cs value can go outside the range
0 – 3. The various MX51_ECSPI_* macros did not take this into consideration
resulting in possible corruption of the configuration.
For example for any cs value over 3 the SCLKPHA bits would not be set and
other values in the register possibly corrupted.
One way to fix this is to just mask the cs bits to 2 bits. This still
allows all 4 native chip selects to work as well as gpio chip selects
(which can use any of the 4 chip select configurations).
Signed-off-by: Kevin Groeneveld <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
Returning early in a platform driver's remove callback is wrong. In this
case the dma resources are not released in the error path. this is never
retried later and so this is a permanent leak. To fix this, only skip
hardware disabling if waking the device fails.
Fixes: 64ff247a978f ("spi: Add Qualcomm QUP SPI controller support")
Signed-off-by: Uwe Kleine-König <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
Intel Meteor Lake-S has the same SPI serial flash controller as Meteor
Lake-P. Add Meteor Lake-S PCI ID to the driver list of supported
devices.
Signed-off-by: Mika Westerberg <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is (mostly) ignored
and this typically results in resource leaks. To improve here there is a
quest to make the remove callback return void. In the first step of this
quest all drivers are converted to .remove_new() which already returns
void.
Convert this driver from always returning zero in the remove callback to
the void returning variant.
Now that bcm2835_spi_remove returns no error code any more,
bcm2835_spi_shutdown() does the same thing as bcm2835_spi_remove(). So
drop the shutdown function and use bcm2835_spi_remove() as .shutdown
callback.
Signed-off-by: Uwe Kleine-König <[email protected]>
Acked-by: Florian Fainelli <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
Convert platform_get_resource(), devm_ioremap_resource() to a single
call to devm_platform_ioremap_resource(), as this is exactly what this
function does.
Signed-off-by: Yang Li <[email protected]>
Reviewed-by: Tudor Ambarus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
According to commit 890cc39a8799 ("drivers: provide
devm_platform_get_and_ioremap_resource()"), convert
platform_get_resource(), devm_ioremap_resource() to a single
call to devm_platform_get_and_ioremap_resource(), as this is exactly
what this function does.
Signed-off-by: Yang Li <[email protected]>
Reviewed-by: Michal Simek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
It's fairly common practice for drivers to switch to a "sleep" pinctrl
state at the end of its runtime_suspend function and then back to
"default" at the beginning of runtime_resume. Let's do that for
spi-qcom-qspi.
Signed-off-by: Douglas Anderson <[email protected]>
Link: https://lore.kernel.org/r/20230323102605.5.I79544b9486033bd7b27f2be55adda6d36f62a366@changeid
Signed-off-by: Mark Brown <[email protected]>
|
|
According to commit 890cc39a8799 ("drivers: provide
devm_platform_get_and_ioremap_resource()"), convert
platform_get_resource(), devm_ioremap_resource() to a single
call to devm_platform_get_and_ioremap_resource(), as this is exactly
what this function does.
Signed-off-by: Yang Li <[email protected]>
Reviewed-by: Baolin Wang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
According to commit 890cc39a8799 ("drivers: provide
devm_platform_get_and_ioremap_resource()"), convert
platform_get_resource(), devm_ioremap_resource() to a single
call to devm_platform_get_and_ioremap_resource(), as this is exactly
what this function does.
Signed-off-by: Yang Li <[email protected]>
Reviewed-by: Baolin Wang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
According to commit 890cc39a8799 ("drivers: provide
devm_platform_get_and_ioremap_resource()"), convert
platform_get_resource(), devm_ioremap_resource() to a single
call to devm_platform_get_and_ioremap_resource(), as this is exactly
what this function does.
Signed-off-by: Yang Li <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
According to commit 890cc39a8799 ("drivers: provide
devm_platform_get_and_ioremap_resource()"), convert
platform_get_resource(), devm_ioremap_resource() to a single
call to devm_platform_get_and_ioremap_resource(), as this is exactly
what this function does.
Signed-off-by: Yang Li <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
According to commit 890cc39a8799 ("drivers: provide
devm_platform_get_and_ioremap_resource()"), convert
platform_get_resource(), devm_ioremap_resource() to a single
call to devm_platform_get_and_ioremap_resource(), as this is exactly
what this function does.
Signed-off-by: Yang Li <[email protected]>
Reviewed-by: Dhruva Gole <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
The .supports_op() callback function returns true by default after
performing driver-specific checks. Therefore the driver cannot apply
the buswidth in devicetree.
Call spi_mem_default_supports_op() helper to handle the buswidth
in devicetree.
Fixes: 1b74dd64c861 ("spi: Add Socionext F_OSPI SPI flash controller driver")
Signed-off-by: Kunihiko Hayashi <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
When clock rate > 100MHz, use the DLL calibration mode, and finally
add the suggested half of the current clock cycle to sample the data.
Signed-off-by: Haibo Chen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
Current DLL config is just to use the default setting, this means
enable the DLL override mode, and use 1 fixed delay cell in the
DLL delay chain, not means "reset" the DLL, so correct this to
avoid confuse.
Signed-off-by: Haibo Chen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
Merge series from Uwe Kleine-König <[email protected]>:
An early error return from a remove callback is usally wrong. In the
case of the spi-sprd driver it's not that critical because the skipped
steps are mainly undoing the things that a successful runtime-resume
would have done.
Still it's cleaner to not exit early and not return an (mostly ignored)
error value. The second patch converts to .remove_new (which is the
motivation for this series).
|
|
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is (mostly) ignored
and this typically results in resource leaks. To improve here there is a
quest to make the remove callback return void. In the first step of this
quest all drivers are converted to .remove_new() which already returns
void.
Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.
Signed-off-by: Uwe Kleine-König <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
Returning early in a platform driver's remove callback is wrong. In this
case the dma resources are not released in the error path. this is never
retried later and so this is a permanent leak. To fix this, only skip
hardware disabling if waking the device fails.
Fixes: d593574aff0a ("spi: imx: do not access registers while clocks disabled")
Signed-off-by: Uwe Kleine-König <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is (mostly) ignored
and this typically results in resource leaks. To improve here there is a
quest to make the remove callback return void. In the first step of this
quest all drivers are converted to .remove_new() which already returns
void.
Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.
Signed-off-by: Uwe Kleine-König <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
If pm_runtime_resume_and_get() failed before this change, two error
messages were printed. One directly in sprd_spi_remove() and another
by the device core as the return value is non-zero.
The better handling of a failure to resume the device is to do the
software related cleanup anyhow and only skip hardware accesses.
This leaves the device in an unknown state, but there is nothing that can
be done about that.
Even in the error case, return zero to suppress the device core's error
message.
Signed-off-by: Uwe Kleine-König <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
Merge series from Uwe Kleine-König <[email protected]>:
This series converts the atmel-quadspi driver to use the .remove_new()
callback that doesn't return an int but void. The motivation is to not
give driver authors a reason to (wrongly) believe that returning an
error code was sensible error handling. In fact the spi core only emits
a warning message in this case and otherwise continues as if the return
value was zero. This usually yields resource leaks that sometimes can
lead to exceptions later on.
The atmel-quadspi driver is one of these drivers that got error handling
wrong, this is fixed here and in the last patch the driver is converted
to .remove_new() with the eventual goal to change .remove() to return
void once all drivers are converted this way.
|
|
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is (mostly) ignored
and this typically results in resource leaks. To improve here there is a
quest to make the remove callback return void. In the first step of this
quest all drivers are converted to .remove_new() which already returns
void.
Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.
Signed-off-by: Uwe Kleine-König <[email protected]>
Reviewed-by: Tudor Ambarus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|
|
An early error exit in atmel_qspi_remove() doesn't prevent the device
unbind. So this results in an spi controller with an unbound parent
and unmapped register space (because devm_ioremap_resource() is undone).
So using the remaining spi controller probably results in an oops.
Instead unregister the controller unconditionally and only skip hardware
access and clk disable.
Also add a warning about resume failing and return zero unconditionally.
The latter has the only effect to suppress a less helpful error message by
the spi core.
Fixes: 4a2f83b7f780 ("spi: atmel-quadspi: add runtime pm support")
Signed-off-by: Uwe Kleine-König <[email protected]>
Reviewed-by: Tudor Ambarus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
|