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path: root/drivers/spi/spi-pxa2xx.c
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2022-02-16spi: pxa2xx: Add support for Intel Raptor Lake PCH-SJarkko Nikula1-0/+5
Add support for LPSS SPI on Intel Raptor Lake PCH-S. It has four controllers each having two chip selects. Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Link: https://lore.kernel.org/r/20220216091317.1302254-1-jarkko.nikula@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2022-01-31spi: pxa2xx_spi: Convert to use GPIO descriptorsLinus Walleij1-62/+1
This converts the PXA2xx SPI driver to use GPIO descriptors exclusively to retrieve GPIO chip select lines. The device tree and ACPI paths of the driver already use descriptors, hence ->use_gpio_descriptors is already set and this codepath is well tested. Convert all the PXA boards providing chip select GPIOs as platform data and drop the old GPIO chipselect handling in favor of the core managing it exclusively. Cc: Marek Vasut <marek.vasut@gmail.com> Cc: Daniel Mack <daniel@zonque.org> Cc: Haojian Zhuang <haojian.zhuang@gmail.com> Cc: Robert Jarzmik <robert.jarzmik@free.fr> Cc: linux-arm-kernel@lists.infradead.org Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20220125005836.494807-1-linus.walleij@linaro.org Signed-off-by: Mark Brown <broonie@kernel.org>
2021-12-23spi: pxa2xx: Propagate firmware nodeAndy Shevchenko1-2/+1
Propagate firmware node by using a specific API call, i.e. device_set_node(). Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20211222155739.7699-3-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-11-29spi: pxa2xx: Get rid of unused enable_loopback memberAndy Shevchenko1-3/+2
There is no user of the enable_loopback member in the struct pxa2xx_spi_chip. Remote this legacy member completely. The mentioned in the documentation the testing phase can be performed with spidev_test tool. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20211123192723.44537-3-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-11-29spi: pxa2xx: Get rid of unused ->cs_control()Andy Shevchenko1-18/+0
Since the last user of the custom ->cs_control() gone, we may get rid of this legacy API completely. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20211123192723.44537-2-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-11-23spi: pxa2xx: Remove redundant ->read() and ->write() in struct chip_dataAndy Shevchenko1-29/+6
Since the commit 196b0e2cf237 ("spi: pxa2xx: Remove if statement that is always true in pump_transfers()") the ->read() and ->write() methods in the struct driver_data are reconfigured for each transfer. Hence no need to keep the intermediate state in the struct chip_data. The same applies to n_bytes member of the same data structure. Get rid of unneeded storage for good. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20211122200622.43305-1-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-07-22spi: pxa2xx: Adapt reset_sccr1() to the case when no message availableAndy Shevchenko1-3/+10
In some cases reset_sccr1() can be called when no message available. This means that there is no associated chip to receive that message and hence no threshold needs to be set. Adapt the function to such cases. Fixes: 3bbdc083262d ("spi: pxa2xx: Reuse int_stop_and_reset() in couple of places") Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20210721121520.62605-1-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-07-19spi: pxa2xx: Reuse int_stop_and_reset() in couple of placesAndy Shevchenko1-9/+3
Reuse int_stop_and_reset() in couple of places. While at it, change the order of the int_stop_and_reset() and pxa2xx_spi_off() to be in align with the similar flow in int_error_stop(). Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20210719074842.36060-3-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-07-19spi: pxa2xx: Reset DMA bits in CR1 in reset_sccr1()Andy Shevchenko1-1/+1
In order to allow reset_sccr1() to be reused in DMA paths, reset DMA bits in CR1 in this function. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20210719074842.36060-2-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-07-19spi: pxa2xx: Convert reset_sccr1() to use pxa2xx_spi_update()Andy Shevchenko1-9/+7
Convert reset_sccr1() to use pxa2xx_spi_update(). It will help for further improvements. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20210719074842.36060-1-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-06-01Merge branch 'for-5.13' of ↵Mark Brown1-1/+6
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi into spi-5.14
2021-06-01spi: Cleanup on failure of initial setupLukas Wunner1-1/+8
Commit c7299fea6769 ("spi: Fix spi device unregister flow") changed the SPI core's behavior if the ->setup() hook returns an error upon adding an spi_device: Before, the ->cleanup() hook was invoked to free any allocations that were made by ->setup(). With the commit, that's no longer the case, so the ->setup() hook is expected to free the allocations itself. I've identified 5 drivers which depend on the old behavior and am fixing them up hereinafter: spi-bitbang.c spi-fsl-spi.c spi-omap-uwire.c spi-omap2-mcspi.c spi-pxa2xx.c Importantly, ->setup() is not only invoked on spi_device *addition*: It may subsequently be called to *change* SPI parameters. If changing these SPI parameters fails, freeing memory allocations would be wrong. That should only be done if the spi_device is finally destroyed. I am therefore using a bool "initial_setup" in 4 of the affected drivers to differentiate between the invocation on *adding* the spi_device and any subsequent invocations: spi-bitbang.c spi-fsl-spi.c spi-omap-uwire.c spi-omap2-mcspi.c In spi-pxa2xx.c, it seems the ->setup() hook can only fail on spi_device addition, not any subsequent calls. It therefore doesn't need the bool. It's worth noting that 5 other drivers already perform a cleanup if the ->setup() hook fails. Before c7299fea6769, they caused a double-free if ->setup() failed on spi_device addition. Since the commit, they're fine. These drivers are: spi-mpc512x-psc.c spi-pl022.c spi-s3c64xx.c spi-st-ssc4.c spi-tegra114.c (spi-pxa2xx.c also already performs a cleanup, but only in one of several error paths.) Fixes: c7299fea6769 ("spi: Fix spi device unregister flow") Signed-off-by: Lukas Wunner <lukas@wunner.de> Cc: Saravana Kannan <saravanak@google.com> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> # pxa2xx Link: https://lore.kernel.org/r/f76a0599469f265b69c371538794101fa37b5536.1622149321.git.lukas@wunner.de Signed-off-by: Mark Brown <broonie@kernel.org>
2021-05-18spi: pxa2xx: Use predefined mask when programming FIFO thresholdsAndy Shevchenko1-1/+2
The predefined mask for threshold modification can be used in case of Intel Merrifield SPI. Replace open-coded value with predefined mask when programming FIFO thresholds. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20210517140351.901-10-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-05-18spi: pxa2xx: Fix style of and typos in the comments and messagesAndy Shevchenko1-33/+38
Fix style of the comments and messages along with typos in them. While at it, update Intel Copyright year. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20210517140351.901-8-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-05-18spi: pxa2xx: Fix printf() specifiersAndy Shevchenko1-4/+3
Instead of explicit casting use proper specifier in one case, and fix specifier signness in another. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20210517140351.901-7-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-05-18spi: pxa2xx: Drop unneeded '!= 0' comparisonsAndy Shevchenko1-4/+4
In the few places it's redundant to compare against 0. Drop the unneeded comparisons. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20210517140351.901-6-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-05-18spi: pxa2xx: Drop duplicate chip_select in struct chip_dataAndy Shevchenko1-3/+1
The struct chip_data had been introduced in order to keep the parameters that may be provided on stack during device allocation. There is no need to duplicate parameters there, which are carried on by SPI device itself. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20210517140351.901-5-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-05-18spi: pxa2xx: Switch to use SPI core GPIO (legacy) CS handlingAndy Shevchenko1-32/+27
SPI core has been already providing the GPIO CS handling. Use it. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20210517140351.901-4-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-05-18spi: pxa2xx: Switch to use SPI core GPIO (descriptor) CS handlingAndy Shevchenko1-48/+3
SPI core has been already providing the GPIO CS handling. Use it. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20210517140351.901-3-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-05-18spi: pxa2xx: Propagate firmware node to the child SPI controller deviceAndy Shevchenko1-1/+3
SPI core may utilize properties and resources provided by the parent device. Propagate firmware node to the child SPI controller device for that. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20210517140351.901-2-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-05-11spi: pxa2xx: Introduce special type for Merrifield SPIsAndy Shevchenko1-3/+29
Intel Merrifield SPI is actually more closer to PXA3xx. It has extended FIFO (32 bytes) and additional registers to get or set FIFO thresholds. Introduce new type for Intel Merrifield SPI host controllers and handle bigger FIFO size. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20210510124134.24638-15-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-05-11spi: pxa2xx: Extract read_SSSR_bits() helperAndy Shevchenko1-15/+11
There are few places that repeat the logic of "read some bits from SSSR". Extract read_SSSR_bits() helper to deduplicate that. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20210510124134.24638-13-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-05-11spi: pxa2xx: Extract clear_SSCR1_bits() helperAndy Shevchenko1-5/+2
There are few places that repeat the logic of "clear some bits in SSCR1". Extract clear_SSCR1_bits() helper to deduplicate that. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20210510124134.24638-12-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-05-11spi: pxa2xx: Extract pxa2xx_spi_update() helperAndy Shevchenko1-19/+14
There are few places that repeat the logic of "update if changed". Extract pxa2xx_spi_update() helper to deduplicate that. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20210510124134.24638-11-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-05-11spi: pxa2xx: Use pxa_ssp_enable()/pxa_ssp_disable() in the driverAndy Shevchenko1-18/+18
There are few places that repeat the logic of pxa_ssp_enable() and pxa_ssp_disable(). Use them instead of open coded variants. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20210510124134.24638-10-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-05-11spi: pxa2xx: Reuse int_error_stop() in pxa2xx_spi_slave_abort()Andy Shevchenko1-12/+5
It appears that pxa2xx_spi_slave_abort()almost repeats the functionality of the int_error_stop(). Reuse int_error_stop() in pxa2xx_spi_slave_abort(). Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20210510124134.24638-9-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-05-11spi: pxa2xx: Introduce int_stop_and_reset() helperAndy Shevchenko1-14/+13
Currently we have three times the same few lines repeated in the code. Deduplicate them by newly introduced int_stop_and_reset() helper. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20210510124134.24638-8-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-05-10spi: pxa2xx: Replace header inclusions by forward declarationsAndy Shevchenko1-0/+2
When the data structure is only referred by pointer, compiler may not need to see the contents of the data type. Thus, we may replace header inclusions by respective forward declarations. Due to above add missed headers as well. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20210423182441.50272-5-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-05-10spi: pxa2xx: Utilize struct device from struct ssp_deviceAndy Shevchenko1-7/+5
We have a duplication of struct device in the struct driver_data, get rid of it and reuse member from struct ssp_device instead. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20210423182441.50272-4-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-05-10spi: pxa2xx: Utilize MMIO and physical base from struct ssp_deviceAndy Shevchenko1-3/+1
We have a duplication of MMIO and physical base addresses in the struct driver_data, get rid of it and reuse members from struct ssp_device instead. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20210423182441.50272-3-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-05-10spi: pxa2xx: Use one point of return when ->probe() failsAndy Shevchenko1-2/+2
When we can't allocate SPI controller, jump to the error path rather than return locally. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20210423182441.50272-2-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-04-15Merge branch 'for-5.12' of ↵Mark Brown1-0/+4
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi into spi-5.13
2021-04-15spi: pxa2xx: Add support for Intel Alder Lake PCH-MJarkko Nikula1-0/+4
Add support for LPSS SPI on Intel Alder Lake PCH-M. Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Link: https://lore.kernel.org/r/20210415135917.54144-1-jarkko.nikula@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-03-24spi: pxa2xx: Fix checkpatch spacing errorsJay Fang1-1/+1
Fix checkpatch errors: ERROR: space prohibited before that ',' (ctx:WxW) #255: FILE: spi-pxa2xx-pci.c:255: + ssp->clk = clk_register_fixed_rate(&dev->dev, buf , NULL, 0, ^ ERROR: "foo* bar" should be "foo *bar" #621: FILE: spi-pxa2xx.c:621: +static void int_error_stop(struct driver_data *drv_data, const char* msg) Signed-off-by: Jay Fang <f.fangjian@huawei.com> Link: https://lore.kernel.org/r/1616566602-13894-4-git-send-email-f.fangjian@huawei.com Signed-off-by: Mark Brown <broonie@kernel.org>
2021-01-14spi: pxa2xx: Add support for Intel Alder Lake PCH-PJarkko Nikula1-0/+4
Add support for LPSS SPI on Intel Alder Lake PCH-P variant. Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Link: https://lore.kernel.org/r/20210114144021.1820262-1-jarkko.nikula@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2020-12-07spi: pxa2xx: Fix use-after-free on unbindLukas Wunner1-3/+2
pxa2xx_spi_remove() accesses the driver's private data after calling spi_unregister_controller() even though that function releases the last reference on the spi_controller and thereby frees the private data. Fix by switching over to the new devm_spi_alloc_master/slave() helper which keeps the private data accessible until the driver has unbound. Fixes: 32e5b57232c0 ("spi: pxa2xx: Fix controller unregister order") Signed-off-by: Lukas Wunner <lukas@wunner.de> Cc: <stable@vger.kernel.org> # v2.6.17+: 5e844cc37a5c: spi: Introduce device-managed SPI controller allocation Cc: <stable@vger.kernel.org> # v2.6.17+: 32e5b57232c0: spi: pxa2xx: Fix controller unregister order Cc: <stable@vger.kernel.org> # v2.6.17+ Link: https://lore.kernel.org/r/5764b04d4a6e43069ebb7808f64c2f774ac6f193.1607286887.git.lukas@wunner.de Signed-off-by: Mark Brown <broonie@kernel.org>
2020-12-04spi: pxa2xx: Add support for Intel Alder Lake PCH-SJarkko Nikula1-0/+5
Add support for LPSS SPI on Intel Alder Lake. It has four LPSS SPI controllers each having two chip selects. Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Link: https://lore.kernel.org/r/20201204082409.183700-1-jarkko.nikula@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2020-07-17spi: spi-pxa2xx: Do not define 'struct acpi_device_id' when !CONFIG_ACPILee Jones1-0/+2
Since ACPI_PTR() is used to NULLify the value when !CONFIG_ACPI, struct 'pxa2xx_spi_acpi_match' becomes defined but unused. Fixes the following W=1 kernel build warning(s): drivers/spi/spi-pxa2xx.c:1435:36: warning: ‘pxa2xx_spi_acpi_match’ defined but not used [-Wunused-const-variable=] 1435 | static const struct acpi_device_id pxa2xx_spi_acpi_match[] = { | ^~~~~~~~~~~~~~~~~~~~~ Signed-off-by: Lee Jones <lee.jones@linaro.org> Cc: Daniel Mack <daniel@zonque.org> Cc: Haojian Zhuang <haojian.zhuang@gmail.com> Cc: Robert Jarzmik <robert.jarzmik@free.fr> Link: https://lore.kernel.org/r/20200717135424.2442271-14-lee.jones@linaro.org Signed-off-by: Mark Brown <broonie@kernel.org>
2020-07-07Merge series "spi: spi-sun6i: One fix and some improvements" from Marc ↵Mark Brown1-0/+5
Kleine-Budde <mkl@pengutronix.de>: Hello, this series first fixes the calculation of the clock rate. The driver will round up to the nearest clock rate instead of rounding down. Resulting in SPI devices accessed with a too high SPI clock. The remaining patches improve the performance of the driver. The changes range from micro-optimizations like reducing MMIO writes to the controller to reducing the number of needed interrupts in some use cases. regards, Marc changes since v1: - added Maxime Ripard's to the existing patches - 06/10: (was 05/10 in v1) "spi: spi-sun6i: sun6i_spi_drain_fifo(): introduce sun6i_spi_get_rx_fifo_count() and make use of it" use FIELD_GET instead of open coding it (tnx: Maxime Ripard) - 05/10: "spi: spi-sun6i: sun6i_spi_get_tx_fifo_count: Convert manual shift+mask to FIELD_GET()" new patch _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
2020-06-25spi: pxa2xx: Add support for Intel Tiger Lake PCH-HJarkko Nikula1-0/+5
Add Intel Tiger Lake PCH-H PCI IDs. Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Link: https://lore.kernel.org/r/20200625140041.745804-1-jarkko.nikula@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2020-05-30Merge remote-tracking branch 'spi/for-5.8' into spi-nextMark Brown1-0/+1
2020-05-26spi: pxa2xx: Fix runtime PM ref imbalance on probe errorLukas Wunner1-1/+0
The PXA2xx SPI driver releases a runtime PM ref in the probe error path even though it hasn't acquired a ref earlier. Apparently commit e2b714afee32 ("spi: pxa2xx: Disable runtime PM if controller registration fails") sought to copy-paste the invocation of pm_runtime_disable() from pxa2xx_spi_remove(), but erroneously copied the call to pm_runtime_put_noidle() as well. Drop it. Fixes: e2b714afee32 ("spi: pxa2xx: Disable runtime PM if controller registration fails") Signed-off-by: Lukas Wunner <lukas@wunner.de> Reviewed-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: stable@vger.kernel.org # v4.17+ Cc: Jarkko Nikula <jarkko.nikula@linux.intel.com> Link: https://lore.kernel.org/r/58b2ac6942ca1f91aaeeafe512144bc5343e1d84.1590408496.git.lukas@wunner.de Signed-off-by: Mark Brown <broonie@kernel.org>
2020-05-26spi: pxa2xx: Fix controller unregister orderLukas Wunner1-1/+3
The PXA2xx SPI driver uses devm_spi_register_controller() on bind. As a consequence, on unbind, __device_release_driver() first invokes pxa2xx_spi_remove() before unregistering the SPI controller via devres_release_all(). This order is incorrect: pxa2xx_spi_remove() disables the chip, rendering the SPI bus inaccessible even though the SPI controller is still registered. When the SPI controller is subsequently unregistered, it unbinds all its slave devices. Because their drivers cannot access the SPI bus, e.g. to quiesce interrupts, the slave devices may be left in an improper state. As a rule, devm_spi_register_controller() must not be used if the ->remove() hook performs teardown steps which shall be performed after unregistering the controller and specifically after unbinding of slaves. Fix by reverting to the non-devm variant of spi_register_controller(). An alternative approach would be to use device-managed functions for all steps in pxa2xx_spi_remove(), e.g. by calling devm_add_action_or_reset() on probe. However that approach would add more LoC to the driver and it wouldn't lend itself as well to backporting to stable. The improper use of devm_spi_register_controller() was introduced in 2013 by commit a807fcd090d6 ("spi: pxa2xx: use devm_spi_register_master()"), but all earlier versions of the driver going back to 2006 were likewise broken because they invoked spi_unregister_master() at the end of pxa2xx_spi_remove(), rather than at the beginning. Fixes: e0c9905e87ac ("[PATCH] SPI: add PXA2xx SSP SPI Driver") Signed-off-by: Lukas Wunner <lukas@wunner.de> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: stable@vger.kernel.org # v2.6.17+ Cc: Tsuchiya Yuto <kitakar@gmail.com> Link: https://bugzilla.kernel.org/show_bug.cgi?id=206403#c1 Link: https://lore.kernel.org/r/834c446b1cf3284d2660f1bee1ebe3e737cd02a9.1590408496.git.lukas@wunner.de Signed-off-by: Mark Brown <broonie@kernel.org>
2020-04-30spi: pxa2xx: Apply CS clk quirk to BXTEvan Green1-0/+1
With a couple allies at Intel, and much badgering, I got confirmation from Intel that at least BXT suffers from the same SPI chip-select issue as Cannonlake (and beyond). The issue being that after going through runtime suspend/resume, toggling the chip-select line without also sending data does nothing. Add the quirk to BXT to briefly toggle dynamic clock gating off and on, forcing the fabric to wake up enough to notice the CS register change. Signed-off-by: Evan Green <evgreen@chromium.org> Cc: Shobhit Srivastava <shobhit.srivastava@intel.com> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20200427163238.1.Ib1faaabe236e37ea73be9b8dcc6aa034cb3c8804@changeid Signed-off-by: Mark Brown <broonie@kernel.org>
2020-03-02Merge series "spi: spidev: Fix messages in spidev" from Oleksandr Suvorov ↵Mark Brown1-0/+23
<oleksandr.suvorov@toradex.com>: - fix the values source for the xfer debug message. - fix the "max speed setting" message showing. Oleksandr Suvorov (2): spi: spidev: fix a debug message value spi: spidev: fix speed setting message drivers/spi/spidev.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) -- 2.24.1
2020-02-28spi: pxa2xx: Introduce is_mmp2_ssp() helperAndy Shevchenko1-4/+9
Introduce is_mmp2_ssp() helper to be consistent with the rest helper function to distinguish SSP type. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20200227162556.3152-1-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2020-02-26spi: pxa2xx: Add CS control clock quirkEvan Green1-0/+23
In some circumstances on Intel LPSS controllers, toggling the LPSS CS control register doesn't actually cause the CS line to toggle. This seems to be failure of dynamic clock gating that occurs after going through a suspend/resume transition, where the controller is sent through a reset transition. This ruins SPI transactions that either rely on delay_usecs, or toggle the CS line without sending data. Whenever CS is toggled, momentarily set the clock gating register to "Force On" to poke the controller into acting on CS. Signed-off-by: Rajat Jain <rajatja@google.com> Signed-off-by: Evan Green <evgreen@chromium.org> Link: https://lore.kernel.org/r/20200211223700.110252-1-rajatja@google.com Signed-off-by: Mark Brown <broonie@kernel.org>
2020-02-25spi: pxa2xx: drv_data can't be NULL in ->remove()Andy Shevchenko1-5/+1
There is no need for drv_data check against NULL, since it won't happen. Remove useless check. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20200224154556.11627-2-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2020-02-25spi: pxa2xx: Return error codes from pxa2xx_spi_init_pdata()Andy Shevchenko1-7/+7
For better understanding what's going on on error path, return distinguished error codes instead of NULL pointer. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20200224154556.11627-1-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
2020-01-23Merge branch 'spi-5.5' into spi-linusMark Brown1-11/+20
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