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5473126596
linux/drivers/spi
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Heiner Kallweit 5473126596 spi: fsl-espi: fix and improve writing to TX FIFO 
This change addresses two issues:
- If the TX FIFO is full the ISR polls until there's free space again.
  An ISR should never wait for something.
- Currently the number of bytes to transfer is rounded up to the next
  multiple of 4. For most transfers therefore few bytes remain in the
  TX FIFO after end of transfer.
  This would cause the next transfer to fail and as a workaround the
  ESPI block is disabled / re-enabled in fsl_espi_change_mode.
  This seems to clear the FIFO's (although it's not mentioned in the
  spec).

With this change the TX FIFO is filled as much as possible initially
and whenever the ISR is called. Also the exact number of bytes is
transferred.
The spinlock protects against a potential race if the first interrupt
occurs whilst the TX FIFO is still being initially filled.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-10-28 19:39:23 +01:00
..
Kconfig Merge remote-tracking branches 'spi/topic/rspi', 'spi/topic/sc18is602', 'spi/topic/sh-msiof', 'spi/topic/spidev-test' and 'spi/topic/st-ssc4' into spi-next 2016-09-30 09:14:18 -07:00
Makefile Merge remote-tracking branches 'spi/topic/octeon', 'spi/topic/pic32-sqi', 'spi/topic/pxa2xx' and 'spi/topic/qup' into spi-next 2016-09-30 09:14:14 -07:00
spi-adi-v3.c
spi-altera.c
spi-ath79.c
spi-atmel.c spi: atmel: fix gpio chip-select in case of non-DT platform 2016-01-28 23:25:54 +01:00
spi-au1550.c
spi-axi-spi-engine.c spi: Drop duplicate code to set master->dev.parent 2016-04-26 11:56:09 +01:00
spi-bcm53xx.c spi: bcm53xx: add spi_flash_read callback for MMIO-based reads 2016-04-18 13:53:46 +01:00
spi-bcm53xx.h
spi-bcm63xx-hsspi.c
spi-bcm63xx.c Merge remote-tracking branches 'spi/topic/bcm63xx', 'spi/topic/butterfly', 'spi/topic/cadence' and 'spi/topic/davinci' into spi-next 2016-01-11 16:48:30 +00:00
spi-bcm2835.c spi: bcm2835: Remove unnecessary workaround to call gpio_set_value 2016-02-15 20:43:39 +00:00
spi-bcm2835aux.c Merge remote-tracking branches 'spi/topic/acpi', 'spi/topic/axi-engine', 'spi/topic/bcm2835' and 'spi/topic/bcm2835aux' into spi-next 2016-03-11 14:28:25 +07:00
spi-bcm-qspi.c spi: iproc-qspi: Add Broadcom iProc SoCs support 2016-09-24 20:03:25 +01:00
spi-bcm-qspi.h spi: iproc-qspi: Add Broadcom iProc SoCs support 2016-09-24 20:03:25 +01:00
spi-bfin5xx.c spi: spi-bfin5xx: Remove deprecated create_singlethread_workqueue 2016-07-03 14:14:31 +02:00
spi-bfin-sport.c spi: spi-bfin-sport: Remove deprecated create_singlethread_workqueue 2016-07-03 14:24:31 +02:00
spi-bitbang-txrx.h
spi-bitbang.c
spi-brcmstb-qspi.c spi: brcmstb-qspi: Broadcom settop platform driver 2016-09-14 18:03:32 +01:00
spi-butterfly.c spi: butterfly: use new parport device model 2015-12-02 19:38:16 +00:00
spi-cadence.c spi: cadence: mark pm functions __maybe_unused 2016-04-18 10:58:49 +01:00
spi-cavium-octeon.c spi: octeon: Split driver into Octeon specific and common parts 2016-07-24 21:54:29 +01:00
spi-cavium-thunderx.c spi: spi-cavium-thunderx: Add missing clk_disable_unprepare() 2016-08-24 12:37:43 +01:00
spi-cavium.c spi: octeon: Split driver into Octeon specific and common parts 2016-07-24 21:54:29 +01:00
spi-cavium.h spi: octeon: Add ThunderX driver 2016-08-19 16:24:39 +01:00
spi-clps711x.c spi: clps711x: Driver refactor 2016-07-07 11:44:43 +02:00
spi-coldfire-qspi.c
spi-davinci.c spi: davinci: Use dma_request_chan() for requesting DMA channel 2016-04-29 18:15:15 +01:00
spi-dln2.c spi: Drop duplicate code to set master->dev.parent 2016-04-26 11:56:09 +01:00
spi-dw-mid.c spi: dw-mid: switch to new dmaengine_terminate_* API 2016-02-05 17:41:49 +00:00
spi-dw-mmio.c spi: dw-mmio: remove message which is handled by core 2016-02-05 17:41:49 +00:00
spi-dw-pci.c spi: dw-pci: Spelling s/paltforms/platforms/g 2016-05-11 18:26:19 +01:00
spi-dw.c spi: dw: round up result of calculation for clock divider 2016-09-12 19:59:08 +01:00
spi-dw.h spi: dw: fix multiple slaves with different baudrates 2016-09-06 11:53:50 +01:00
spi-efm32.c
spi-ep93xx.c spi: spi-ep93xx: Fix the PTR_ERR() argument 2016-05-24 16:54:50 +01:00
spi-falcon.c
spi-fsl-cpm.c QE: Move QE from arch/powerpc to drivers/soc 2015-12-22 17:12:56 -06:00
spi-fsl-cpm.h
spi-fsl-dspi.c spi: spi-fsl-dspi: Drop extra spi_master_put in device remove function 2016-08-22 17:45:22 +01:00
spi-fsl-espi.c spi: fsl-espi: fix and improve writing to TX FIFO 2016-10-28 19:39:23 +01:00
spi-fsl-lib.c
spi-fsl-lib.h spi: fsl-espi: fix and improve writing to TX FIFO 2016-10-28 19:39:23 +01:00
spi-fsl-spi.c
spi-fsl-spi.h
spi-gpio.c
spi-img-spfi.c spi: img-spfi: Remove spi_master_put in img_spfi_remove() 2016-07-27 19:00:16 +01:00
spi-imx.c spi: imx: fix error return code in spi_imx_probe() 2016-09-28 09:50:55 -07:00
spi-iproc-qspi.c spi: iproc-qspi: Add Broadcom iProc SoCs support 2016-09-24 20:03:25 +01:00
spi-jcore.c spi: jcore: remove unnecessary platform_set_drvdata() 2016-08-09 10:40:05 +01:00
spi-lm70llp.c spi: lm70llp: remove printk 2015-12-07 20:09:09 +00:00
spi-loopback-test.c spi: loopback-test: mark rx_ranges_cmp() static 2016-09-01 20:54:54 +01:00
spi-lp8841-rtc.c spi: lp-8841: return correct error code from probe 2016-02-26 11:06:38 +09:00
spi-meson-spifc.c spi: meson: Add GXBB compatible 2016-09-12 20:11:39 +01:00
spi-mpc52xx-psc.c spi: spi-mpc52xx-psc: Remove deprecated create_singlethread_workqueue 2016-07-03 14:23:25 +02:00
spi-mpc52xx.c
spi-mpc512x-psc.c
spi-mt65xx.c spi: mediatek: remove spi_master_put in mtk_spi_remove() 2016-07-27 19:00:16 +01:00
spi-mxs.c
spi-nuc900.c
spi-oc-tiny.c
spi-omap2-mcspi.c spi: omap2-mcspi: Use the SPI framework to handle DMA mapping 2016-07-08 10:48:02 +02:00
spi-omap-100k.c
spi-omap-uwire.c
spi-orion.c spi: orion: Fix return value check in orion_spi_probe() 2016-06-13 16:36:40 +01:00
spi-pic32-sqi.c spi: pic32-sqi: use list_move_tail and list_move 2016-08-08 11:56:40 +01:00
spi-pic32.c spi: pic32: fixup wait_for_completion_timeout return handling 2016-07-24 21:49:16 +01:00
spi-pl022.c spi: pl022: Remove obsolete struct pl022 members from kerneldoc 2016-02-17 12:08:55 +00:00
spi-ppc4xx.c
spi-pxa2xx-dma.c spi: pxa2xx: Remove pointer to chip data from driver data 2016-09-12 20:01:27 +01:00
spi-pxa2xx-pci.c spi: pxa2xx-pci: fix ACPI-based enumeration of SPI devices 2016-08-24 12:20:03 +01:00
spi-pxa2xx.c spi: pxa2xx: Fix build error because of missing header 2016-09-29 11:00:41 -07:00
spi-pxa2xx.h spi: pxa2xx: Add support for GPIO descriptor chip selects 2016-09-26 09:11:14 -07:00
spi-qup.c Merge remote-tracking branches 'spi/topic/octeon', 'spi/topic/pic32-sqi', 'spi/topic/pxa2xx' and 'spi/topic/qup' into spi-next 2016-09-30 09:14:14 -07:00
spi-rb4xx.c
spi-rockchip.c Merge remote-tracking branches 'spi/topic/pxa2xx', 'spi/topic/rockchip', 'spi/topic/s3c64xx', 'spi/topic/sh' and 'spi/topic/sh-msiof' into spi-next 2016-07-24 22:08:25 +01:00
spi-rspi.c spi: rspi: Increase accuracy of bit rate for RZ 2016-08-08 11:56:46 +01:00
spi-s3c24xx-fiq.h
spi-s3c24xx-fiq.S
spi-s3c24xx.c
spi-s3c64xx.c spi: s3c64xx: restore removed comments 2016-07-14 17:28:32 +01:00
spi-sc18is602.c spi: sc18is602: Change gpiod_set_value to gpiod_set_value_cansleep 2016-09-29 11:01:36 -07:00
spi-sh-hspi.c
spi-sh-msiof.c spi: sh-msiof: Avoid invalid clock generator parameters 2016-08-05 11:46:07 +01:00
spi-sh-sci.c
spi-sh.c spi: spi-sh: Remove deprecated create_singlethread_workqueue 2016-07-11 19:32:38 +01:00
spi-sirf.c
spi-st-ssc4.c spi: st-ssc4: Fix misuse of devm_gpio_request/devm_gpio_free APIs 2016-09-14 16:05:35 +01:00
spi-sun4i.c Merge remote-tracking branches 'spi/topic/spidev', 'spi/topic/sunxi', 'spi/topic/ti-qspi', 'spi/topic/topcliff-pch' and 'spi/topic/txx9' into spi-next 2016-07-24 22:08:27 +01:00
spi-sun6i.c Merge remote-tracking branches 'spi/topic/spidev', 'spi/topic/sunxi', 'spi/topic/ti-qspi', 'spi/topic/topcliff-pch' and 'spi/topic/txx9' into spi-next 2016-07-24 22:08:27 +01:00
spi-tegra20-sflash.c
spi-tegra20-slink.c
spi-tegra114.c
spi-test.h spi: loopback: added additional non-power of 2 transfer lengthes 2015-12-13 20:10:15 +00:00
spi-ti-qspi.c spi: spi-ti-qspi: Add DMA support for QSPI mmap read 2016-08-17 12:24:28 +01:00
spi-tle62x0.c
spi-topcliff-pch.c spi: spi-topcliff-pch: Remove deprecated create_singlethread_workqueue 2016-07-11 19:32:26 +01:00
spi-txx9.c spi: spi-txx9: Add missing clock (un)prepare calls for CCF 2016-08-18 19:10:39 +01:00
spi-xcomm.c
spi-xilinx.c spi: xilinx: Return IRQ_NONE if no interrupts were detected 2016-07-15 11:45:00 +01:00
spi-xlp.c spi: xlp: Add ACPI support for Vulcan SPI controller 2016-08-09 15:25:43 +01:00
spi-xtensa-xtfpga.c
spi-zynqmp-gqspi.c spi: zynqmp: disable clocks in error paths 2016-05-04 14:21:03 +01:00
spi.c kthread: kthread worker API cleanup 2016-10-11 15:06:33 -07:00
spidev.c spi: spidev: Add ACPI probing support 2016-07-04 16:28:52 +02:00