- 18 Mar, 2020 6 commits
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Vladimir Oltean authored
Currently the driver puts the process in interruptible sleep waiting for the interrupt train to finish transfer to/from the tx_buf and rx_buf. But exiting the process with ctrl-c may make the kernel panic: the wait_event_interruptible call will return -ERESTARTSYS, which a proper driver implementation is perhaps supposed to handle, but nonetheless this one doesn't, and aborts the transfer altogether. Actually when the task is interrupted, there is still a high chance that the dspi_interrupt is still triggering. And if dspi_transfer_one_message returns execution all the way to the spi_device driver, that can free the spi_message and spi_transfer structures, leaving the interrupts to access a freed tx_buf and rx_buf. hexdump -C /dev/mtd0 00000000 00 75 68 75 0a ff ff ff ff ff ff ff ff ff ff ff |.uhu............| 00000010 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................| * ^C[ 38.495955] fsl-dspi 2120000.spi: Waiting for transfer to complete failed! [ 38.503097] spi_master spi2: failed to transfer one message from queue [ 38.509729] Unable to handle kernel paging request at virtual address ffff800095ab3377 [ 38.517676] Mem abort info: [ 38.520474] ESR = 0x96000045 [ 38.523533] EC = 0x25: DABT (current EL), IL = 32 bits [ 38.528861] SET = 0, FnV = 0 [ 38.531921] EA = 0, S1PTW = 0 [ 38.535067] Data abort info: [ 38.537952] ISV = 0, ISS = 0x00000045 [ 38.541797] CM = 0, WnR = 1 [ 38.544771] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000082621000 [ 38.551494] [ffff800095ab3377] pgd=00000020fffff003, p4d=00000020fffff003, pud=0000000000000000 [ 38.560229] Internal error: Oops: 96000045 [#1] PREEMPT SMP [ 38.565819] Modules linked in: [ 38.568882] CPU: 0 PID: 2729 Comm: hexdump Not tainted 5.6.0-rc4-next-20200306-00052-gd8730cdc8a0b-dirty #193 [ 38.578834] Hardware name: Kontron SMARC-sAL28 (Single PHY) on SMARC Eval 2.0 carrier (DT) [ 38.587129] pstate: 20000085 (nzCv daIf -PAN -UAO) [ 38.591941] pc : ktime_get_real_ts64+0x3c/0x110 [ 38.596487] lr : spi_take_timestamp_pre+0x40/0x90 [ 38.601203] sp : ffff800010003d90 [ 38.604525] x29: ffff800010003d90 x28: ffff80001200e000 [ 38.609854] x27: ffff800011da9000 x26: ffff002079c40400 [ 38.615184] x25: ffff8000117fe018 x24: ffff800011daa1a0 [ 38.620513] x23: ffff800015ab3860 x22: ffff800095ab3377 [ 38.625841] x21: 000000000000146e x20: ffff8000120c3000 [ 38.631170] x19: ffff0020795f6e80 x18: ffff800011da9948 [ 38.636498] x17: 0000000000000000 x16: 0000000000000000 [ 38.641826] x15: ffff800095ab3377 x14: 0720072007200720 [ 38.647155] x13: 0720072007200765 x12: 0775076507750771 [ 38.652483] x11: 0720076d076f0772 x10: 0000000000000040 [ 38.657812] x9 : ffff8000108e2100 x8 : ffff800011dcabe8 [ 38.663139] x7 : 0000000000000000 x6 : ffff800015ab3a60 [ 38.668468] x5 : 0000000007200720 x4 : ffff800095ab3377 [ 38.673796] x3 : 0000000000000000 x2 : 0000000000000ab0 [ 38.679125] x1 : ffff800011daa000 x0 : 0000000000000026 [ 38.684454] Call trace: [ 38.686905] ktime_get_real_ts64+0x3c/0x110 [ 38.691100] spi_take_timestamp_pre+0x40/0x90 [ 38.695470] dspi_fifo_write+0x58/0x2c0 [ 38.699315] dspi_interrupt+0xbc/0xd0 [ 38.702987] __handle_irq_event_percpu+0x78/0x2c0 [ 38.707706] handle_irq_event_percpu+0x3c/0x90 [ 38.712161] handle_irq_event+0x4c/0xd0 [ 38.716008] handle_fasteoi_irq+0xbc/0x170 [ 38.720115] generic_handle_irq+0x2c/0x40 [ 38.724135] __handle_domain_irq+0x68/0xc0 [ 38.728243] gic_handle_irq+0xc8/0x160 [ 38.732000] el1_irq+0xb8/0x180 [ 38.735149] spi_nor_spimem_read_data+0xe0/0x140 [ 38.739779] spi_nor_read+0xc4/0x120 [ 38.743364] mtd_read_oob+0xa8/0xc0 [ 38.746860] mtd_read+0x4c/0x80 [ 38.750007] mtdchar_read+0x108/0x2a0 [ 38.753679] __vfs_read+0x20/0x50 [ 38.757002] vfs_read+0xa4/0x190 [ 38.760237] ksys_read+0x6c/0xf0 [ 38.763471] __arm64_sys_read+0x20/0x30 [ 38.767319] el0_svc_common.constprop.3+0x90/0x160 [ 38.772125] do_el0_svc+0x28/0x90 [ 38.775449] el0_sync_handler+0x118/0x190 [ 38.779468] el0_sync+0x140/0x180 [ 38.782793] Code: 91000294 1400000f d50339bf f9405e80 (f90002c0) [ 38.788910] ---[ end trace 55da560db4d6bef7 ]--- [ 38.793540] Kernel panic - not syncing: Fatal exception in interrupt [ 38.799914] SMP: stopping secondary CPUs [ 38.803849] Kernel Offset: disabled [ 38.807344] CPU features: 0x10002,20006008 [ 38.811451] Memory Limit: none [ 38.814513] ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]--- So it is clear that the "interruptible" part isn't handled correctly. When the process receives a signal, one could either attempt a clean abort (which appears to be difficult with this hardware) or just keep restarting the sleep until the wait queue really completes. But checking in a loop for -ERESTARTSYS is a bit too complicated for this driver, so just make the sleep uninterruptible, to avoid all that nonsense. The wait queue was actually restructured as a completion, after polling other drivers for the most "popular" approach. Fixes: 349ad66c ("spi:Add Freescale DSPI driver for Vybrid VF610 platform") Reported-by:
Michael Walle <michael@walle.cc> Signed-off-by:
Vladimir Oltean <vladimir.oltean@nxp.com> Tested-by:
Mark Brown <broonie@kernel.org>
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Vladimir Oltean authored
dspi->words_in_flight is a variable populated in the *_write functions and used in the dspi_fifo_read function. It is also used in dspi_fifo_write, immediately after transmission, to update the message->actual_length variable used by higher layers such as spi-mem for integrity checking. But it may happen that the IRQ which calls dspi_fifo_read to be triggered before the updating of message->actual_length takes place. In that case, dspi_fifo_read will decrement dspi->words_in_flight to -1, and that will cause an invalid modification of message->actual_length. For that, we make the simplest fix possible: to not decrement the actual shared variable in dspi->words_in_flight from dspi_fifo_read, but actually a copy of it which is on stack. But even if dspi_fifo_read from the next IRQ does not interfere with the dspi_fifo_write of the current chunk, the *next* dspi_fifo_write still can. So we must assume that everything after the last write to the TX FIFO can be preempted by the "TX complete" IRQ, and the dspi_fifo_write function must be safe against that. This means refactoring the 2 flavours of FIFO writes (for EOQ and XSPI) such that the calculation of the number of words to be written is common and happens a priori. This way, the code for updating the message->actual_length variable works with a copy and not with the volatile dspi->words_in_flight. After some interior debate, the dspi->progress variable used for software timestamping was *not* backed up against preemption in a copy on stack. Because if preemption does occur between spi_take_timestamp_pre and spi_take_timestamp_post, there's really no point in trying to save anything. The first-in-time spi_take_timestamp_post call with a dspi->progress higher than the requested xfer->ptp_sts_word_post will trigger xfer->timestamped = true anyway and will close the deal. To understand the above a bit better, consider a transfer with xfer->ptp_sts_word_pre = xfer->ptp_sts_word_post = 3, and xfer->bits_per_words = 8 (so byte 3 needs to be timestamped). The DSPI controller timestamps in chunks of 4 bytes at a time, and preemption occurs in the middle of timestamping the first chunk: spi_take_timestamp_pre(0) . . (preemption) . . spi_take_timestamp_pre(4) . . spi_take_timestamp_post(7) . spi_take_timestamp_post(3) So the reason I'm not bothering to back up dspi->progress for that spi_take_timestamp_post(3) is that spi_take_timestamp_post(7) is going to (a) be more honest, (b) provide better accuracy and (c) already render the spi_take_timestamp_post(3) into a noop by setting xfer->timestamped = true anyway. Fixes: d59c90a2 ("spi: spi-fsl-dspi: Convert TCFQ users to XSPI FIFO mode") Reported-by: -
Vladimir Oltean authored
If dspi->words_in_flight is populated with the hardware FIFO size, then in dspi_fifo_read it will attempt to read more data at the end of a buffer that is not a multiple of 16 bytes in length. It will probably time out attempting to do so. So limit the num_fifo_entries variable to the actual number of FIFO entries that is going to be used. Fixes: d59c90a2 ("spi: spi-fsl-dspi: Convert TCFQ users to XSPI FIFO mode") Signed-off-by:
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Vladimir Oltean authored
In DMA mode, dspi_setup_accel does not get called, which results in the dspi->oper_word_size variable (which is used by dspi_dma_xfer) to not be initialized properly. Because oper_word_size is zero, a few calculations end up being incorrect, and the DMA transfer eventually times out instead of sending anything on the wire. Set up native transfers (or 8-on-16 acceleration) using dspi_setup_accel for DMA mode too. Also take the opportunity and simplify the DMA buffer handling a little bit. Fixes: 6c1c26ec ("spi: spi-fsl-dspi: Accelerate transfers using larger word size if possible") Signed-off-by:
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Vladimir Oltean authored
In XSPI mode, the 32-bit PUSHR register can be written to separately: the higher 16 bits are for commands and the lower 16 bits are for data. This has nicely been hacked around, by defining a second regmap with a width of 16 bits, and effectively splitting a 32-bit register into 2 16-bit ones, from the perspective of this regmap_pushr. The problem is the assumption about the controller's endianness. If the controller is little endian (such as anything post-LS1046A), then the first 2 bytes, in the order imposed by memory layout, will actually hold the TXDATA, and the last 2 bytes will hold the CMD. So take the controller's endianness into account when performing split writes to PUSHR. The obvious and simple solution would have been to call regmap_get_val_endian(), but that is an internal regmap function and we don't want to change regmap just for this. Therefore, we just re-read the "big-endian" device tree property. Fixes: 58ba07ec ("spi: spi-fsl-dspi: Add support for XSPI mode registers") Signed-off-by:
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Vladimir Oltean authored
The SPI_MCR_PCSIS macro assumes that the controller has a number of chip select signals equal to 6. That is not always the case, but actually is described through the driver-specific "spi-num-chipselects" device tree binding. LS1028A for example only has 4 chip selects. Don't write to the upper bits of the PCSIS field, which are reserved in the reference manual. Fixes: 349ad66c ("spi:Add Freescale DSPI driver for Vybrid VF610 platform") Signed-off-by:
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- 17 Mar, 2020 1 commit
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Linus Walleij authored
This driver is not using any symbols from the GPIO .h files so drop them. It was however implicitly using <linux/pinctrl/consumer.h> so include that instead. Cc: Fabio Estevam <fabio.estevam@nxp.com> Signed-off-by:
Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20200317092457.264055-1-linus.walleij@linaro.orgSigned-off-by:
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- 13 Mar, 2020 2 commits
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Geert Uytterhoeven authored
The descriptions for the spi-rx-bus-width and spi-tx-bus-width properties refer to "MISO" and "MOSI", which are not explained in the document. While these abbreviations are fairly common when talking about SPI, and thus may not need an explanation, they are not entirely correct in this context, as the SPI controller may be used in slave mode instead of master mode. Fix this by replacing them by "read transfers" resp. "write transfers", like is done for the spi-rx-delay-us and spi-tx-delay-us properties. Signed-off-by:
Geert Uytterhoeven <geert+renesas@glider.be> Acked-by:
Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20200306085038.8111-3-geert+renesas@glider.beSigned-off-by:
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Geert Uytterhoeven authored
Currently, the DT bindings for an SPI controller specify that "#address-cells" must be fixed to one. However, that applies to an SPI controller in master mode only. When running in SPI slave mode, "#address-cells" should not be specified. Fix this making "#address-cells" mutually-exclusive with "spi-slave". Fixes: 0a1b9293 ("spi: Add YAML schemas for the generic SPI options") Reported-by:
Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by:
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- 12 Mar, 2020 12 commits
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Mark Brown authored
Merge series "spi: meson-spicc: add support for AXG and G12A variants" from Neil Armstrong <narmstrong@baylibre.com>: The SPICC controller in Amlogic AXG & G12A is capable of driving the CLK/MOSI/SS signal lines through the idle state which avoid the signals floating in unexpected state, is capable of using linear clock divider to reach a much fine tuned range of clocks, while the old controller only uses a power of two clock divider, result at a more coarse clock range and finally is capable of running at 80M clock. The SPICC controller in Amlogic G12A takes the source clock from a specific clock instead of the bus clock and has a different FIFO size and doesn't handle the RX Half interrupt the same way as GXL & AXG variants. Thus the burst management is simplified and takes in account a variable FIFO size. Now the controller can support frequencies higher than 30MHz, we need the setup the I/O line delays in regard of the SPI clock frequency. Neil Armstrong (7): spi: meson-spicc: remove unused variables spi: meson-spicc: support max 80MHz clock spi: meson-spicc: add min sclk for each compatible spi: meson-spicc: setup IO line delay spi: meson-spicc: adapt burst handling for G12A support dt-bindings: spi: amlogic,meson-gx-spicc: add Amlogic G12A compatible spi: meson-spicc: add support for Amlogic G12A Sunny Luo (2): spi: meson-spicc: enhance output enable feature spi: meson-spicc: add a linear clock divider support .../bindings/spi/amlogic,meson-gx-spicc.yaml | 22 + drivers/spi/Kconfig | 1 + drivers/spi/spi-meson-spicc.c | 496 +++++++++++++----- 3 files changed, 392 insertions(+), 127 deletions(-) -- 2.22.0 _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic
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Wolfram Sang authored
to_spi_device() already checks 'dev'. No need to do it before calling it. Signed-off-by:
Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by:
Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Link: https://lore.kernel.org/r/20200312134507.10000-1-wsa@the-dreams.deSigned-off-by:
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Neil Armstrong authored
The Amlogic G12A SPICC controllers uses a secondary clock used to feed the baud rate generator and the delay control logic. Signed-off-by:
Neil Armstrong <narmstrong@baylibre.com> Link: https://lore.kernel.org/r/20200312133131.26430-9-narmstrong@baylibre.comSigned-off-by:
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Neil Armstrong authored
Add support for the SPICC controllers on the Amlogic G12A SoCs family. The G12A SPICC controllers inherit from the AXG enhanced registers but takes an external pclk for the baud rate generator and can achieve up to 166MHz SCLK. Signed-off-by:
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Neil Armstrong authored
The G12A SPICC controller variant has a different FIFO size and doesn't handle the RX Half interrupt the same way as GXL & AXG variants. Thus simplify the burst management and take in account a variable FIFO size. Signed-off-by:
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Neil Armstrong authored
Now the controller can support frequencies higher than 30MHz, we need the setup the I/O line delays in regard of the SPI clock frequency. Signed-off-by:
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Neil Armstrong authored
The G12A SPICC controller variant takes the source clock from a specific clock instead of the bus clock. The minimal clock calculus won't work with the G12A support, thus add the minimal supported clock for each variant and pass this to the SPI core. Signed-off-by:
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Neil Armstrong authored
The SPICC controller in Meson-AXG is capable of running at 80M clock. The ASIC IP is improved and the clock is actually running higher than previous old SoCs. Signed-off-by:
Yixun Lan <yixun.lan@amlogic.com> Signed-off-by:
Sunny Luo <sunny.luo@amlogic.com> Link: https://lore.kernel.org/r/20200312133131.26430-5-narmstrong@baylibre.comSigned-off-by:
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Sunny Luo authored
The SPICC controller in Meson-AXG SoC is capable of using a linear clock divider to reach a much fine tuned range of clocks, while the old controller only use a power of two clock divider, result at a more coarse clock range. Also convert the clock registration into Common Clock Framework. Signed-off-by:
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Sunny Luo authored
The SPICC controller in Meson-AXG is capable of driving the CLK/MOSI/SS signal lines through the idle state (between two transmission operation), which avoid the signals floating in unexpected state. Signed-off-by:
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Neil Armstrong authored
Remove unused variables from spicc data struct. Signed-off-by:
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Dan Carpenter authored
The platform_get_resource_byname() function returns NULL on error, it doesn't return error pointers. Fixes: d166a735 ("spi: fspi: dynamically alloc AHB memory") Signed-off-by:
Dan Carpenter <dan.carpenter@oracle.com> Link: https://lore.kernel.org/r/20200312113154.GC20562@mwandaSigned-off-by:
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- 11 Mar, 2020 6 commits
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Mark Brown authored
Merge tag 'mtk-mtd-spi-move' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi into spi-5.7 spi: Rewrite mtk-quadspi spi-nor driver with spi-mem This patchset from Chuanhong Guo <gch981213@gmail.com> adds a spi-mem driver for Mediatek SPI-NOR controller, which already has limited support by mtk-quadspi. This new driver can make use of full quadspi capability of this controller.
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Chuanhong Guo authored
This driver is superseded by the new spi-mtk-nor driver. Signed-off-by:
Chuanhong Guo <gch981213@gmail.com> Acked-by:
Tudor Ambarus <tudor.ambarus@microchip.com> Link: https://lore.kernel.org/r/20200306085052.28258-5-gch981213@gmail.comSigned-off-by:
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Chuanhong Guo authored
spi-mtk-nor is a driver to replace mtk-quadspi and they have almost the same device-tree bindings. Reuse this binding documentation and convert it for new driver: 1. "Mediatek SoCs" -> "Mediatek ARM SoCs" because MTK MIPS SoCs use different controllers. 2. document "interrupts" as a required property because it's available on all SoCs with this controller and new driver takes advantages of it. It's implemented as optional only to maintain backward compatibility. 3. add a dummy interrupt binding in example. Signed-off-by:
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Chuanhong Guo authored
This is a driver for mtk spi-nor controller using spi-mem interface. The same controller already has limited support provided by mtk-quadspi driver under spi-nor framework and this new driver is a replacement for the old one. Comparing to the old driver, this driver has following advantages: 1. It can handle any full-duplex spi transfer up to 6 bytes, and this is implemented using generic spi interface. 2. It take account into command opcode properly. The reading routine in this controller can only use 0x03 or 0x0b as opcode on 1-1-1 transfers, but old driver doesn't implement this properly. This driver checks supported opcode explicitly and use (1) to perform unmatched operations. 3. It properly handles SFDP reading. Old driver can't read SFDP due to the bug mentioned in (2). 4. It can do 1-2-2 and 1-4-4 fast reading on spi-nor. These two ops requires parsing SFDP, which isn't possible in old driver. And the old driver is only flagged to support 1-1-2 mode. 5. It takes advantage of the DMA feature in this controller for long reads and supports IRQ on DMA requests to free cpu cycles from polling status registers on long DMA reading. It achieves up to 17.5MB/s reading speed (1-4-4 mode) which is way faster than the old one. IRQ is implemented as optional to maintain backward compatibility. Signed-off-by:
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Chuanhong Guo authored
We only need a spi-max-frequency when we specifically request a spi frequency lower than the max speed of spi host. This property is already documented as optional property and current host drivers are implemented to operate at highest speed possible when spi->max_speed_hz is 0. This patch makes spi-max-frequency an optional property so that we could just omit it to use max controller speed. Signed-off-by:
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John Garry authored
By selecting MTD_SPI_NOR for SPI_HISI_SFC_V3XX, we may introduce unmet dependencies: WARNING: unmet direct dependencies detected for MTD_SPI_NOR Depends on [m]: MTD [=m] && SPI_MASTER [=y] Selected by [y]: - SPI_HISI_SFC_V3XX [=y] && SPI [=y] && SPI_MASTER [=y] && (ARM64 && ACPI [=y] || COMPILE_TEST [=y]) && HAS_IOMEM [=y] Since MTD_SPI_NOR is only selected by SPI_HISI_SFC_V3XX for practical reasons - slave devices use the spi-nor driver, enabled by MTD_SPI_NOR - just drop it. Signed-off-by:
John Garry <john.garry@huawei.com> Link: https://lore.kernel.org/r/1583948115-239907-1-git-send-email-john.garry@huawei.comSigned-off-by:
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- 10 Mar, 2020 7 commits
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Michael Walle authored
Use the correct device to request the DMA mapping. Otherwise the IOMMU doesn't get the mapping and it will generate a page fault. The error messages look like: [ 3.008452] arm-smmu 5000000.iommu: Unhandled context fault: fsr=0x402, iova=0xf9800000, fsynr=0x3f0022, cbfrsynra=0x828, cb=8 [ 3.020123] arm-smmu 5000000.iommu: Unhandled context fault: fsr=0x402, iova=0xf9800000, fsynr=0x3f0022, cbfrsynra=0x828, cb=8 This was tested on a custom board with a LS1028A SoC. Signed-off-by:
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Mark Brown authored
Merge series "spi: Add FSI-attached SPI controller driver" from Eddie James <eajames@linux.ibm.com>: This series adds a dts binding and a driver for a new SPI controller that is accessed over FSI bus. Eddie James (2): dt-bindings: fsi: Add FSI2SPI bindings spi: Add FSI-attached SPI controller driver .../devicetree/bindings/fsi/ibm,fsi2spi.yaml | 36 ++ MAINTAINERS | 7 + drivers/spi/Kconfig | 7 + drivers/spi/Makefile | 1 + drivers/spi/spi-fsi.c | 558 ++++++++++++++++++ 5 files changed, 609 insertions(+) create mode 100644 Documentation/devicetree/bindings/fsi/ibm,fsi2spi.yaml create mode 100644 drivers/spi/spi-fsi.c -- 2.24.0
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Qiujun Huang authored
some members were not described in documentation. Signed-off-by:
Qiujun Huang <hqjagain@gmail.com> Link: https://lore.kernel.org/r/1583774179-30736-1-git-send-email-hqjagain@gmail.comSigned-off-by:
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Geert Uytterhoeven authored
All RSPI variants support setting the polarity of the SSL signal. Advertize support for active-high chip selects, and configure polarity according to the state of the flag. Signed-off-by:
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Johan Jonker authored
The Rockchip spi binding is updated to yaml and new models were added. The spi on px30,rk3308 and rk3328 are the same as other Rockchip based SoCs, so add compatible string for it. Signed-off-by:
Johan Jonker <jbx6244@gmail.com> Link: https://lore.kernel.org/r/20200309151004.7780-1-jbx6244@gmail.comSigned-off-by:
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Eddie James authored
There exists a set of SPI controllers on some POWER processors that may be accessed through the FSI bus. Add a driver to traverse the FSI CFAM engine that can access and drive the SPI controllers. This driver would typically be used by a baseboard management controller (BMC). The SPI controllers operate by means of programming a sequencing engine which automatically manages the usual SPI protocol buses. The driver programs each transfer into the sequencer as various operations specifying the slave chip and shifting data in and out on the lines. Signed-off-by:
Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/20200306194118.18581-3-eajames@linux.ibm.comSigned-off-by:
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Eddie James authored
Add documentation for the FSI2SPI CFAM engine, which provides access to a number of SPI controllers. Signed-off-by:
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- 06 Mar, 2020 1 commit
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Joe Perches authored
commit a2ca53b5 ("spi: Add HiSilicon v3xx SPI NOR flash controller driver") likely inadvertently used a select statement with a CONFIG_ prefix, remove the prefix. Reported-by:
Randy Dunlap <rdunlap@infradead.org> Signed-off-by:
Joe Perches <joe@perches.com> Acked-by:
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- 05 Mar, 2020 5 commits
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Mark Brown authored
Vladimir Oltean <vladimir.oltean@nxp.com>: From: Vladimir Oltean <vladimir.oltean@nxp.com> This series aims to remove the most inefficient transfer method from the NXP DSPI driver. TCFQ (Transfer Complete Flag) mode works by transferring one word, waiting for its TX confirmation interrupt (or polling on the equivalent status bit), sending the next word, etc, until the buffer is complete. The issue with this mode is that it's fundamentally incompatible with any sort of batching such as writing to a FIFO. But actually, due to previous patchset ("Compatible string consolidation for NXP DSPI driver"): https://patchwork.kernel.org/cover/11414593/ all existing users of TCFQ mode today already support a more advanced feature set, in the form of XSPI (extended SPI). XSPI brings 2 extra features: - Word sizes up to 32 bits. This is sub-utilized today, and acceleration of smaller-than-32 bpw values is provided. - "Command cycling", basically the ability to write multiple words in a row and receiving an interrupt only after the completion of the last one. This is what enables us to make use of the full FIFO depth of this controller. Series was tested on the NXP LS1021A-TSN and LS1043A-RDB boards, both functionally as well as from a performance standpoint. The command used to benchmark the increased throughput was: spidev_test --device /dev/spidev1.0 --bpw 8 --size 256 --cpha --iter 10000000 --speed 20000000 where spidev1.0 is a dummy spidev node, using a chip select that no peripheral responds to. On LS1021A, which has a 4-entry-deep FIFO and a less powerful CPU, the performance increase brought by this patchset is from 2700 kbps to 5800 kbps. On LS1043A, which has a 16-entry-deep FIFO and a more powerful CPU, the performance increases from 4100 kbps to 13700 kbps. On average, SPI software timestamping is not adversely affected by the extra batching, due to the extra patches. There is one extra patch which clarifies why the TCFQ users were not converted to the "other" mode in this driver that makes use of the FIFO, which would be EOQ mode. My request to the many people on CC (known users and/or contributors) is to give this series a test to ensure there are no regressions, and for the Coldfire maintainers to clarify whether the EOQ limitation is acceptable for them in the long run. Vladimir Oltean (12): spi: spi-fsl-dspi: Simplify bytes_per_word gymnastics spi: spi-fsl-dspi: Remove unused chip->void_write_data spi: spi-fsl-dspi: Don't mask off undefined bits spi: spi-fsl-dspi: Add comments around dspi_pop_tx and dspi_push_rx functions spi: spi-fsl-dspi: Rename fifo_{read,write} and {tx,cmd}_fifo_write spi: spi-fsl-dspi: Implement .max_message_size method for EOQ mode spi: Do spi_take_timestamp_pre for as many times as necessary spi: spi-fsl-dspi: Convert TCFQ users to XSPI FIFO mode spi: spi-fsl-dspi: Accelerate transfers using larger word size if possible spi: spi-fsl-dspi: Optimize dspi_setup_accel for lowest interrupt count spi: spi-fsl-dspi: Use EOQ for last word in buffer even for XSPI mode spi: spi-fsl-dspi: Take software timestamp in dspi_fifo_write drivers/spi/spi-fsl-dspi.c | 421 ++++++++++++++++++++++++------------- drivers/spi/spi.c | 19 +- include/linux/spi/spi.h | 3 +- 3 files changed, 288 insertions(+), 155 deletions(-) -- 2.17.1 -
Johan Jonker authored
The description below is already in use for rk3328.dtsi, but was somehow never added to a document, so add "rockchip,rk3328-spi", "rockchip,rk3066-spi" for spi nodes on a rk3328 platform to spi-rockchip.yaml. Signed-off-by:
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Johan Jonker authored
The description below is already in use for rk3308.dtsi, but was somehow never added to a document, so add "rockchip,rk3308-spi", "rockchip,rk3066-spi" for spi nodes on a rk3308 platform to spi-rockchip.yaml. Signed-off-by:
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Johan Jonker authored
Current dts files with 'spi' nodes are manually verified. In order to automate this process spi-rockchip.txt has to be converted to yaml. In the new setup spi-rockchip.yaml will inherit properties from spi-controller.yaml. Add document to MAINTAINERS. Also rk3188.dtsi, rk3288.dtsi, rk3368.dtsi and rk3399.dtsi use an extra fallback string, so change this in the documentation. Changed: "rockchip,rk3188-spi", "rockchip,rk3066-spi" "rockchip,rk3288-spi", "rockchip,rk3066-spi" "rockchip,rk3368-spi", "rockchip,rk3066-spi" "rockchip,rk3399-spi", "rockchip,rk3066-spi" Signed-off-by:
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Sascha Hauer authored
The SPI bus number is completely optional to Linux, so make the corresponding device tree property optional as well. Signed-off-by:
Sascha Hauer <s.hauer@pengutronix.de> Link: https://lore.kernel.org/r/20200305115546.31814-1-s.hauer@pengutronix.deSigned-off-by:
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