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linux/drivers/spi
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Vladimir Oltean ea93ed4c18
spi: spi-fsl-dspi: Use EOQ for last word in buffer even for XSPI mode 
The EOQ mode has a hardware limitation in that it stops the transmission
(including the deassertion of the chip select signal) once the host CPU
requests end-of-queue for a particular word in the TX FIFO.

And XSPI mode has a limitation in that we need a separate CMD FIFO entry
for the last byte in the buffer, where the chip select signal needs to
be deasserted. It's not a functional limitation, but it's rather clunky
and the fact that we need to halt the pipeline and write a single entry
to the TX FIFO whenever a buffer ends brings the throughput down when
transmitting small buffers.

So the idea here is to use EOQ's limitation in our favor when using XSPI
mode. Stop special-casing that final word in the buffer, and just kill
the chip select signal by issuing an EOQ for that last word. Now it can
be mixed in with all the other words in the current TX FIFO train.

A small trick here is that we still keep using the XSPI-specific
signaling via the CMDTCFQ interrupt in RSER, and not enabling the EOQ
interrupt, in order to avoid hardware weirdness (potential races with
separate interrupts being raised for CMDTCFQ and EOQ for what is in fact
the end of the same transmission). That is just theoretical, but it's
good to be cautious, and the EOQ interrupt isn't needed.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://lore.kernel.org/r/20200304220044.11193-12-olteanv@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
 		2020-03-05 14:06:23 +00:00
..
Kconfig spi: Add generic SPI multiplexer 2020-02-12 23:56:18 +00:00
Makefile spi: Add generic SPI multiplexer 2020-02-12 23:56:18 +00:00
atmel-quadspi.c spi: atmel-quadspi: fix possible MMIO window size overrun 2020-02-28 17:43:47 +00:00
internals.h spi: Add an helper to flush the message queue 2018-04-23 15:48:18 +01:00
spi-altera.c spi: altera: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:14:50 +01:00
spi-ar934x.c spi: add driver for ar934x spi controller 2020-02-11 11:37:30 +00:00
spi-armada-3700.c spi: a3700: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:15:09 +01:00
spi-at91-usart.c spi: at91-usart: Use dma_request_chan() directly for channel request 2019-11-15 12:13:02 +00:00
spi-ath79.c spi: ath79: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:15:29 +01:00
spi-atmel.c spi: atmel: Use dma_request_chan() instead dma_request_slave_channel() 2019-12-16 11:56:07 +00:00
spi-au1550.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
spi-axi-spi-engine.c spi: spi-axi: extend support for the `delay` field 2019-10-15 11:47:26 +01:00
spi-bcm-qspi.c spi: bcm-qspi: Use platform_get_irq_byname_optional() to avoid error message 2020-01-07 22:32:04 +00:00
spi-bcm-qspi.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 459 2019-06-19 17:09:09 +02:00
spi-bcm63xx-hsspi.c spi: bcm63xx-hsspi: Really keep pll clk enabled 2020-03-02 15:03:19 +00:00
spi-bcm63xx.c spi: bcm63xx: extend error condition to `delay` as well 2019-10-15 11:47:06 +01:00
spi-bcm2835.c spi: bcm2835: Raise maximum number of slaves to 4 2020-01-09 21:25:44 +00:00
spi-bcm2835aux.c spi: bcm2835aux: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:16:08 +01:00
spi-bitbang-txrx.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
spi-bitbang.c spi: bitbang: Make chipselect callback optional 2019-12-09 18:46:34 +00:00
spi-brcmstb-qspi.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 459 2019-06-19 17:09:09 +02:00
spi-butterfly.c spi: docs: convert to ReST and add it to the kABI bookset 2019-07-31 14:13:13 -06:00
spi-cadence.c spi: cadence: Correct handling of native chipselect 2019-11-27 12:54:45 +00:00
spi-cavium-octeon.c spi: octeon: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:17:27 +01:00
spi-cavium-thunderx.c spi: spi-cavium-thunderx: Add missing pci_release_regions() 2019-12-09 18:44:19 +00:00
spi-cavium.c spi: use new `spi_transfer_delay_exec` helper where straightforward 2019-10-15 11:51:57 +01:00
spi-cavium.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
spi-clps711x.c spi: clps711x: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:17:36 +01:00
spi-coldfire-qspi.c spi: coldfire-qspi: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:17:56 +01:00
spi-davinci.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
spi-dln2.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 372 2019-06-05 17:37:10 +02:00
spi-dw-mid.c remove ioremap_nocache and devm_ioremap_nocache 2020-01-06 09:45:59 +01:00
spi-dw-mmio.c Merge branch 'spi-5.5' into spi-next 2019-11-22 19:56:35 +00:00
spi-dw-pci.c spi: dw-pci: Fix Chip Select amount on Intel Elkhart Lake PSE SPI 2019-10-22 17:57:43 +01:00
spi-dw.c Merge branch 'spi-5.6' into spi-next 2020-01-23 12:37:18 +00:00
spi-dw.h spi: spi-dw: Add lock protect dw_spi rx/tx to prevent concurrent calls 2020-01-03 00:59:40 +00:00
spi-efm32.c spi: Remove dev_err() usage after platform_get_irq() 2019-08-02 12:15:43 +01:00
spi-ep93xx.c spi: Remove dev_err() usage after platform_get_irq() 2019-08-02 12:15:43 +01:00
spi-falcon.c spi: spi-falcon: extend warning to `delay` as well 2019-10-15 11:46:57 +01:00
spi-fsl-cpm.c spi: fsl-cpm: Correct the free:ing 2019-11-15 12:12:15 +00:00
spi-fsl-cpm.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
spi-fsl-dspi.c spi: spi-fsl-dspi: Use EOQ for last word in buffer even for XSPI mode 2020-03-05 14:06:23 +00:00
spi-fsl-espi.c spi: use new `spi_transfer_delay_exec` helper where straightforward 2019-10-15 11:51:57 +01:00
spi-fsl-lib.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
spi-fsl-lib.h spi: fsl: Convert to use CS GPIO descriptors 2019-08-28 14:10:41 +01:00
spi-fsl-lpspi.c spi: fsl-lpspi: remove unneeded array 2020-03-03 14:47:18 +00:00
spi-fsl-qspi.c spi: spi-fsl-qspi: Ensure width is respected in spi-mem operations 2020-01-21 17:08:27 +00:00
spi-fsl-spi.c spi: fsl: simplify error path in of_fsl_spi_probe() 2020-01-14 16:08:29 +00:00
spi-fsl-spi.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
spi-geni-qcom.c spi: spi-geni-qcom: Drop of.h include 2020-02-11 11:36:51 +00:00
spi-gpio.c Merge branch 'for-5.4' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi into spi-5.5 2019-10-08 19:12:28 +01:00
spi-hisi-sfc-v3xx.c spi: HiSilicon v3xx: Use DMI quirk to set controller buswidth override bits 2020-02-28 18:01:44 +00:00
spi-img-spfi.c spi: img-spfi: Use dma_request_chan() instead dma_request_slave_channel() 2019-12-16 11:57:06 +00:00
spi-imx.c spi: imx: use true,false for bool variable 2019-12-25 18:17:25 +00:00
spi-iproc-qspi.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
spi-jcore.c remove ioremap_nocache and devm_ioremap_nocache 2020-01-06 09:45:59 +01:00
spi-lantiq-ssc.c spi: lantiq-ssc: Use devm_platform_ioremap_resource() in lantiq_ssc_probe() 2019-10-01 12:34:18 +01:00
spi-lm70llp.c spi: docs: convert to ReST and add it to the kABI bookset 2019-07-31 14:13:13 -06:00
spi-loopback-test.c spi: spi-loopback-test: use new `delay` field 2019-10-15 11:45:19 +01:00
spi-lp8841-rtc.c spi: lp-8841: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:18:35 +01:00
spi-mem.c spi: spi-mem: Compute length only when needed 2020-02-28 18:17:18 +00:00
spi-meson-spicc.c spi: meson-spicc: Use GPIO descriptors 2019-12-16 11:58:48 +00:00
spi-meson-spifc.c spi: spi-meson-spifc: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:19:14 +01:00
spi-mpc52xx-psc.c spi: use new `spi_transfer_delay_exec` helper where straightforward 2019-10-15 11:51:57 +01:00
spi-mpc52xx.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428 2019-06-05 17:37:16 +02:00
spi-mpc512x-psc.c spi: use new `spi_transfer_delay_exec` helper where straightforward 2019-10-15 11:51:57 +01:00
spi-mt65xx.c spi: mediatek: add SPI_CS_HIGH support 2019-11-18 17:47:00 +00:00
spi-mt7621.c spi: mt7621: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:19:34 +01:00
spi-mux.c spi: Add generic SPI multiplexer 2020-02-12 23:56:18 +00:00
spi-mxic.c Merge branch 'for-5.4' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi into spi-5.5 2019-10-08 19:12:28 +01:00
spi-mxs.c spi: mxs: Use dma_request_chan() instead dma_request_slave_channel() 2019-12-16 11:57:26 +00:00
spi-npcm-fiu.c remove ioremap_nocache and devm_ioremap_nocache 2020-01-06 09:45:59 +01:00
spi-npcm-pspi.c Merge branch 'spi-5.6' into spi-next 2020-01-23 12:37:18 +00:00
spi-nxp-fspi.c spi: nxp-fspi: Ensure width is respected in spi-mem operations 2019-12-16 11:54:34 +00:00
spi-oc-tiny.c spi: oc-tiny: Use GPIO descriptors 2019-12-27 01:08:11 +00:00
spi-omap-100k.c spi: use new `spi_transfer_delay_exec` helper where straightforward 2019-10-15 11:51:57 +01:00
spi-omap-uwire.c
…
spi-omap2-mcspi.c spi: spi-omap2-mcspi: Support probe deferral for DMA channels 2020-02-06 15:53:57 +00:00
spi-orion.c treewide: remove redundant IS_ERR() before error code check 2020-02-04 03:05:27 +00:00
spi-pic32-sqi.c spi: pic32-sqi: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:20:52 +01:00
spi-pic32.c spi: pic32: Retire dma_request_slave_channel_compat() 2019-11-22 19:53:41 +00:00
spi-pl022.c spi: pl022: Use dma_request_chan() directly for channel request 2019-11-15 12:14:19 +00:00
spi-ppc4xx.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
spi-pxa2xx-dma.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
spi-pxa2xx-pci.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
spi-pxa2xx.c Merge series "spi: spidev: Fix messages in spidev" from Oleksandr Suvorov <oleksandr.suvorov@toradex.com>: 2020-03-02 15:19:59 +00:00
spi-pxa2xx.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
spi-qcom-qspi.c spi: spi-qcom-qspi: Use device managed memory for clk_bulk_data 2020-01-13 15:04:40 +00:00
spi-qup.c spi: qup: call spi_qup_pm_resume_runtime before suspending 2020-02-21 13:48:08 +00:00
spi-rb4xx.c spi: rb4xx: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:21:21 +01:00
spi-rockchip.c Linux 5.2-rc4 2019-06-10 18:52:53 +01:00
spi-rspi.c spi: rspi: Add support for LSB-first word order 2020-02-19 00:08:24 +00:00
spi-s3c24xx-fiq.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
spi-s3c24xx-fiq.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
spi-s3c24xx.c spi: s3c24xx: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:21:31 +01:00
spi-s3c64xx.c spi: s3c64xx: Use dma_request_chan() directly for channel request 2019-11-15 12:14:39 +00:00
spi-sc18is602.c spi: use new `spi_transfer_delay_exec` helper where straightforward 2019-10-15 11:51:57 +01:00
spi-sh-hspi.c spi: use new `spi_transfer_delay_exec` helper where straightforward 2019-10-15 11:51:57 +01:00
spi-sh-msiof.c spi: sh-msiof: Do not redefine STR while compile testing 2020-01-09 13:27:05 +00:00
spi-sh-sci.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
spi-sh.c spi: Remove dev_err() usage after platform_get_irq() 2019-08-02 12:15:43 +01:00
spi-sifive.c spi: sifive: disable clk when probe fails and remove 2019-11-04 13:26:11 +00:00
spi-sirf.c spi: sirf: Use dma_request_chan() instead dma_request_slave_channel() 2019-12-16 11:57:36 +00:00
spi-slave-mt27xx.c spi: mediatek: Use devm_platform_ioremap_resource() in mtk_spi_slave_probe() 2019-10-01 12:34:58 +01:00
spi-slave-system-control.c spi: slave: Fix missing break in switch 2018-10-03 16:23:10 +01:00
spi-slave-time.c spi: slave: Add SPI slave handler reporting uptime at previous message 2017-05-26 13:12:04 +01:00
spi-sprd-adi.c spi: sprd: adi: Set BIT_WDG_NEW bit when rebooting 2019-10-28 13:17:10 +00:00
spi-sprd.c spi: sprd: Fix the incorrect SPI register 2019-12-04 12:14:13 +00:00
spi-st-ssc4.c spi: st-ssc4: add missed pm_runtime_disable 2019-11-18 12:59:11 +00:00
spi-stm32-qspi.c spi: stm32-qspi: properly manage probe errors 2020-02-11 11:37:10 +00:00
spi-stm32.c spi: stm32: Use dma_request_chan() instead dma_request_slave_channel() 2019-12-16 11:58:28 +00:00
spi-sun4i.c spi: sun4i: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:22:29 +01:00
spi-sun6i.c spi: sun6i: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:22:49 +01:00
spi-synquacer.c spi: Remove dev_err() usage after platform_get_irq() 2019-08-02 12:15:43 +01:00
spi-tegra20-sflash.c spi: tegra20-sflash: use to new `spi_transfer_delay_exec` 2019-10-15 11:45:07 +01:00
spi-tegra20-slink.c spi: tegra20-slink: add missed clk_unprepare 2019-11-15 12:15:22 +00:00
spi-tegra114.c spi: tegra114: use true,false for bool variable 2019-12-25 18:17:42 +00:00
spi-test.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
spi-ti-qspi.c spi: spi-ti-qspi: fix warning 2020-01-17 15:37:44 +00:00
spi-tle62x0.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
spi-topcliff-pch.c spi/topcliff-pch: Remove unneeded semicolon 2019-12-09 18:45:53 +00:00
spi-txx9.c spi: txx9: Convert to use GPIO descriptors 2019-10-30 14:14:32 +00:00
spi-uniphier.c spi: uniphier: Add DMA transfer mode support 2019-12-25 18:21:05 +00:00
spi-xcomm.c spi: use new `spi_transfer_delay_exec` helper where straightforward 2019-10-15 11:51:57 +01:00
spi-xilinx.c spi: xilinx: Add DT support for selecting transfer word width 2019-10-24 12:45:21 +01:00
spi-xlp.c spi: xlp: use devm_platform_ioremap_resource() to simplify code 2019-09-04 17:23:28 +01:00
spi-xtensa-xtfpga.c spi: xtensa-xtfpga: Use devm_platform_ioremap_resource() in xtfpga_spi_probe() 2019-10-01 12:35:18 +01:00
spi-zynq-qspi.c spi: zynq-qspi: Support two chip selects 2019-11-08 17:45:09 +00:00
spi-zynqmp-gqspi.c spi/zynqmp: remove entry that causes a cs glitch 2020-02-27 12:48:56 +00:00
spi.c spi: Do spi_take_timestamp_pre for as many times as necessary 2020-03-05 14:06:19 +00:00
spidev.c spi: spidev: fix speed setting message 2020-03-02 15:19:55 +00:00