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Aswath Govindraju 572a7d15f2 spi: omap2-mcspi: Improve performance waiting for CHSTAT 
[ Upstream commit 7b1d96813317358312440d0d07abbfbeb0ef8d22 ]

This reverts commit 13d515c796 (spi: omap2-mcspi: Switch to
readl_poll_timeout()).

The amount of time spent polling for the MCSPI_CHSTAT bits to be set on
AM335x-icev2 platform is less than 1us (about 0.6us) in most cases, with
or without using DMA. So, in most cases the function need not sleep.
Also, setting the sleep_usecs to zero would not be optimal here because
ktime_add_us() used in readl_poll_timeout() is slower compared to the
direct addition used after the revert. So, it is sub-optimal to use
readl_poll_timeout in this case.

When DMA is not enabled, this revert results in an increase of about 27%
in throughput and decrease of about 20% in CPU usage. However, the CPU
usage and throughput are almost the same when used with DMA.

Therefore, fix this by reverting the commit which switched to using
readl_poll_timeout().

Fixes: 13d515c796ad ("spi: omap2-mcspi: Switch to readl_poll_timeout()")
Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
Link: https://lore.kernel.org/r/20200910122624.8769-1-a-govindraju@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-10-29 09:57:41 +01:00
..
atmel-quadspi.c
spi: atmel-quadspi: fix possible MMIO window size overrun
2020-03-12 13:00:26 +01:00
internals.h
…
Kconfig
spi: Prevent adding devices below an unregistering controller
2020-08-26 10:40:50 +02:00
Makefile
ARM: SoC driver updates for v5.4
2019-09-16 15:52:38 -07:00
spi-altera.c
spi: altera: use devm_platform_ioremap_resource() to simplify code
2019-09-04 17:14:50 +01:00
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: add DMA support
2019-05-08 17:45:26 +09:00
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: fix handling of cs_change set on non-last xfer
2020-01-17 19:49:01 +01:00
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: use devm_platform_ioremap_resource() to simplify code
2019-09-04 17:15:49 +01:00
spi-bcm63xx-hsspi.c
spi: bcm63xx-hsspi: Really keep pll clk enabled
2020-03-12 13:00:24 +01:00
spi-bcm63xx.c
spi: Remove dev_err() usage after platform_get_irq()
2019-08-02 12:15:43 +01:00
spi-bcm2835.c
spi: bcm2835: Fix controller unregister order
2020-06-17 16:40:29 +02:00
spi-bcm2835aux.c
spi: bcm2835aux: Fix controller unregister order
2020-06-17 16:40:29 +02:00
spi-bcm-qspi.c
spi: bcm-qspi: when tx/rx buffer is NULL set to 0
2020-06-17 16:40:30 +02:00
spi-bcm-qspi.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 459
2019-06-19 17:09:09 +02:00
spi-bitbang-txrx.h
…
spi-bitbang.c
Linux 5.2-rc4
2019-06-10 18:52:53 +01:00
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
2019-12-31 16:45:59 +01:00
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()
2020-01-12 12:21:20 +01:00
spi-cavium.c
…
spi-cavium.h
…
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
spi: dw: Return any value retrieved from the dma_transfer callback
2020-06-22 09:31:10 +02:00
spi-dw-mmio.c
spi: dw-mmio: use devm_platform_ioremap_resource() to simplify code
2019-09-04 17:18:05 +01:00
spi-dw-pci.c
Merge branch 'spi-5.4' into spi-next
2019-09-15 10:32:06 +01:00
spi-dw.c
spi: dw: Return any value retrieved from the dma_transfer callback
2020-06-22 09:31:10 +02:00
spi-dw.h
spi: spi-dw: Add lock protect dw_spi rx/tx to prevent concurrent calls
2020-02-01 09:34:44 +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
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
spi-fsl-cpm.c
spi: fsl-spi: use devm_platform_ioremap_resource() to simplify code
2019-09-04 17:24:26 +01:00
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: Fix lockup if device is shutdown during SPI transfer
2020-07-22 09:32:55 +02:00
spi-fsl-espi.c
spi: fsl-espi: Only process interrupts for expected events
2020-10-07 08:01:27 +02:00
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: fix only one cs-gpio working
2020-02-24 08:36:28 +01:00
spi-fsl-qspi.c
spi: spi-fsl-qspi: Ensure width is respected in spi-mem operations
2020-02-24 08:36:54 +01:00
spi-fsl-spi.c
spi: fsl: Handle the single hardwired chipselect case
2020-01-12 12:21:13 +01:00
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: use devm_platform_ioremap_resource() to simplify code
2019-09-04 17:18:25 +01:00
spi-gpio.c
spi: gpio: prevent memory leak in spi_gpio_probe
2019-12-31 16:43:16 +01:00
spi-img-spfi.c
spi: img-spfi: fix potential double release
2019-12-31 16:44:46 +01:00
spi-imx.c
Merge branch 'spi-5.1' into spi-5.2 for stm32
2019-03-15 17:06:34 +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
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
spi-lantiq-ssc.c
spi: lantiq-ssc: Fix warning by using WQ_MEM_RECLAIM
2020-08-19 08:16:14 +02:00
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: Fix out-of-bounds read
2020-09-23 12:40:35 +02:00
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: Fix Dual/Quad modes on Octal-capable devices
2020-06-22 09:30:50 +02:00
spi-meson-spicc.c
spi: meson-spicc: use devm_platform_ioremap_resource() to simplify code
2019-09-04 17:18:55 +01:00
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
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
spi-mpc52xx.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428
2019-06-05 17:37:16 +02:00
spi-mpc512x-psc.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
spi-mt65xx.c
spi: mediatek: use correct SPI_CFG2_REG MACRO
2020-07-29 10:18:37 +02:00
spi-mt7621.c
spi: mt7621: use devm_platform_ioremap_resource() to simplify code
2019-09-04 17:19:34 +01:00
spi-mxic.c
spi: mxic: simplify getting .driver_data
2019-03-20 17:20:29 +00:00
spi-mxs.c
spi: mxs: use devm_platform_ioremap_resource() to simplify code
2019-09-04 17:19:54 +01:00
spi-npcm-fiu.c
spi: npcm-fiu: remove set but not used variable 'retlen'
2019-09-05 18:19:45 +01:00
spi-npcm-pspi.c
spi: npcm: use devm_platform_ioremap_resource() to simplify code
2019-09-04 17:20:03 +01:00
spi-nxp-fspi.c
spi: nxp-fspi: Ensure width is respected in spi-mem operations
2020-01-12 12:21:34 +01:00
spi-oc-tiny.c
spi: oc-tiny: use devm_platform_ioremap_resource() to simplify code
2019-09-04 17:20:33 +01:00
spi-omap2-mcspi.c
spi: omap2-mcspi: Improve performance waiting for CHSTAT
2020-10-29 09:57:41 +01:00
spi-omap-100k.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
2019-05-30 11:26:37 -07:00
spi-omap-uwire.c
…
spi-orion.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
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: Remove dev_err() usage after platform_get_irq()
2019-08-02 12:15:43 +01:00
spi-pl022.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
2019-05-30 11:26:37 -07:00
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
spi: pxa2xx: Apply CS clk quirk to BXT
2020-06-22 09:30:51 +02:00
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 devm_platform_ioremap_resource() to simplify code
2019-09-04 17:21:12 +01:00
spi-qup.c
spi: qup: call spi_qup_pm_resume_runtime before suspending
2020-03-25 08:25:42 +01:00
spi-rb4xx.c
spi: rb4xx: use devm_platform_ioremap_resource() to simplify code
2019-09-04 17:21:21 +01:00
spi-rockchip.c
spi: rockchip: Fix error in SPI slave pio read
2020-08-19 08:15:58 +02:00
spi-rspi.c
spi: rspi: Use platform_get_irq_byname_optional() for optional irqs
2020-01-17 19:49:01 +01:00
spi-s3c24xx-fiq.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
spi-s3c24xx-fiq.S
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: spi-s3c64xx: Check return values
2020-10-29 09:57:34 +01:00
spi-sc18is602.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
2019-05-30 11:26:37 -07:00
spi-sh-hspi.c
spi: sh-hspi: Replace spi_master by spi_controller
2019-02-08 13:04:19 +00:00
spi-sh-msiof.c
spi: sh-msiof: Use devm_platform_ioremap_resource() helper
2019-08-07 14:24:47 +01:00
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
2019-12-31 16:44:34 +01:00
spi-sirf.c
spi: sirf: use devm_platform_ioremap_resource() to simplify code
2019-09-04 17:22:00 +01:00
spi-slave-mt27xx.c
spi: Remove dev_err() usage after platform_get_irq()
2019-08-02 12:15:43 +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-sprd-adi.c
spi: sprd: switch the sequence of setting WDG_LOAD_LOW and _HIGH
2020-07-22 09:33:18 +02:00
spi-sprd.c
spi: sprd: Fix the incorrect SPI register
2020-01-17 19:49:00 +01:00
spi-st-ssc4.c
spi: st-ssc4: add missed pm_runtime_disable
2019-12-31 16:45:37 +01:00
spi-stm32-qspi.c
spi: stm32-qspi: Fix kernel oops when unbinding driver
2019-12-13 08:43:13 +01:00
spi-stm32.c
spi: stm32: fix pm_runtime_get_sync() error checking
2020-09-17 13:47:44 +02:00
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: spi-sun6i: sun6i_spi_transfer_one(): fix setting of clock rate
2020-07-22 09:33:02 +02:00
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: tegra: use devm_platform_ioremap_resource() to simplify code
2019-09-04 17:22:58 +01:00
spi-tegra20-slink.c
spi: tegra20-slink: add missed clk_unprepare
2019-12-31 16:45:33 +01:00
spi-tegra114.c
Linux 5.2-rc4
2019-06-10 18:52:53 +01:00
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 a bug when accessing non default CS
2020-01-12 12:21:25 +01:00
spi-tle62x0.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
spi-topcliff-pch.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 285
2019-06-05 17:36:37 +02:00
spi-txx9.c
…
spi-uniphier.c
spi: uniphier: Fix FIFO threshold
2020-01-09 10:20:04 +01:00
spi-xcomm.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 149
2019-05-30 11:25:18 -07:00
spi-xilinx.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
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
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
spi-zynq-qspi.c
spi: zynq-qspi: use devm_platform_ioremap_resource() to simplify code
2019-09-04 17:24:07 +01:00
spi-zynqmp-gqspi.c
spi/zynqmp: remove entry that causes a cs glitch
2020-03-25 08:25:45 +01:00
spi.c
spi: Fix memory leak on splited transfers
2020-09-23 12:40:38 +02:00
spidev.c
spi: spidev: Align buffers for DMA
2020-08-19 08:16:25 +02:00