Martin Sperl 7ee41ab2f9 spi: bcm2835aux: fix corruptions for longer spi transfers ... [ Upstream commit 73b114ee7d ] On long running tests with a mcp2517fd can controller it showed that on rare occations the data read shows corruptions for longer spi transfers. Example of a 22 byte transfer: expected (as captured on logic analyzer): FF FF 78 00 00 00 08 06 00 00 91 20 77 56 84 85 86 87 88 89 8a 8b read by the driver: FF FF 78 00 00 00 08 06 00 00 91 20 77 56 84 88 89 8a 00 00 8b 9b To fix this use BCM2835_AUX_SPI_STAT_RX_LVL to determine when we may read data from the fifo reliably without any corruption. Surprisingly the only values ever empirically read in BCM2835_AUX_SPI_STAT_RX_LVL are 0x00, 0x10, 0x20 and 0x30. So whenever the mask is not 0 we can read from the fifo in a safe manner. The patch has now been tested intensively and we are no longer able to reproduce the "RX" issue any longer. Fixes: 1ea29b39f4 ("spi: bcm2835aux: add bcm2835 auxiliary spi device...") Reported-by: Hubert Denkmair <h.denkmair@intence.de> Signed-off-by: Martin Sperl <kernel@martin.sperl.org> Acked-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2019-09-10 10:32:19 +01:00
..
Kconfig	Merge remote-tracking branches 'spi/topic/pxa', 'spi/topic/pxa2xx', 'spi/topic/qup', 'spi/topic/rockchip' and 'spi/topic/sh' into spi-next	2017-09-04 15:51:26 +01:00
Makefile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
spi-adi-v3.c
spi-altera.c	spi: altera: Consolidate TX/RX data register access	2017-08-16 11:53:31 +01:00
spi-armada-3700.c	spi: a3700: Clear DATA_OUT when performing a read	2018-04-26 11:02:07 +02:00
spi-ath79.c	spi/ath79: Fix checkpatch warnings	2017-07-17 12:09:38 +01:00
spi-atmel.c	spi: atmel: init FIFOs before spi enable	2018-04-24 09:36:24 +02:00
spi-au1550.c
spi-axi-spi-engine.c	spi: spi-axi: fix potential use-after-free after deregistration	2017-12-10 13:40:39 +01:00
spi-bcm-qspi.c	spi: bcm-qspi: switch back to reading flash using smaller chunks	2018-11-13 11:14:45 -08:00
spi-bcm-qspi.h
spi-bcm53xx.c
spi-bcm53xx.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
spi-bcm63xx-hsspi.c	Merge remote-tracking branches 'spi/topic/altera', 'spi/topic/at79', 'spi/topic/bcm-qspi', 'spi/topic/bcm63xx' and 'spi/topic/bcm63xx-hspi' into spi-next	2017-09-04 15:51:14 +01:00
spi-bcm63xx.c	spi/bcm63xx: fix error return code in bcm63xx_spi_probe()	2017-08-08 11:36:35 +01:00
spi-bcm2835.c	spi: bcm2835: Fix 3-wire mode if DMA is enabled	2019-08-09 17:53:37 +02:00
spi-bcm2835aux.c	spi: bcm2835aux: fix corruptions for longer spi transfers	2019-09-10 10:32:19 +01:00
spi-bfin-sport.c
spi-bfin5xx.c
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: Fix NULL pointer dereference in spi_unregister_master	2019-07-10 09:54:31 +02:00
spi-brcmstb-qspi.c
spi-butterfly.c
spi-cadence.c	spi: cadence: Change usleep_range() to udelay(), for atomic context	2018-09-09 19:55:53 +02:00
spi-cavium-octeon.c
spi-cavium-thunderx.c
spi-cavium.c
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-coldfire-qspi.c
spi-davinci.c	spi: davinci: fix a NULL pointer dereference	2018-09-09 19:55:52 +02:00
spi-dln2.c
spi-dw-mid.c
spi-dw-mmio.c	spi: dw: Disable clock after unregistering the host	2017-04-18 19:16:49 +01:00
spi-dw-pci.c
spi-dw.c
spi-dw.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
spi-efm32.c
spi-ep93xx.c	spi: spi-ep93xx: Use dma_data_direction for ep93xx_spi_dma_{finish,prepare}	2018-11-13 11:14:52 -08:00
spi-falcon.c	spi: spi-falcon: drop check of boot select	2017-09-01 11:33:22 +01:00
spi-fsl-cpm.c
spi-fsl-cpm.h
spi-fsl-dspi.c	spi: spi-fsl-dspi: Fix imprecise abort on VF500 during probe	2018-09-09 19:55:53 +02:00
spi-fsl-espi.c
spi-fsl-lib.c
spi-fsl-lib.h
spi-fsl-lpspi.c
spi-fsl-spi.c	Merge remote-tracking branches 'spi/topic/devprop', 'spi/topic/fsl', 'spi/topic/fsl-dspi', 'spi/topic/imx' and 'spi/topic/lantiq' into spi-next	2017-04-26 15:58:04 +01:00
spi-fsl-spi.h
spi-gpio.c
spi-img-spfi.c
spi-imx.c	spi: imx: mx51-ecspi: Move some initialisation to prepare_message hook.	2018-12-29 13:39:11 +01:00
spi-iproc-qspi.c
spi-jcore.c
spi-lantiq-ssc.c	Merge remote-tracking branches 'spi/topic/devprop', 'spi/topic/fsl', 'spi/topic/fsl-dspi', 'spi/topic/imx' and 'spi/topic/lantiq' into spi-next	2017-04-26 15:58:04 +01:00
spi-lm70llp.c
spi-loopback-test.c	spi: loopback-test: implement testing with no CS	2017-07-26 13:08:56 +01:00
spi-lp8841-rtc.c
spi-meson-spicc.c	spi: meson-spicc: Fix error handling in meson_spicc_probe()	2018-08-03 07:50:38 +02:00
spi-meson-spifc.c
spi-mpc52xx-psc.c
spi-mpc52xx.c
spi-mpc512x-psc.c
spi-mt65xx.c	spi: mediatek: add spi support for mt2712 IC	2017-06-20 13:39:14 +01:00
spi-mxs.c
spi-nuc900.c
spi-oc-tiny.c
spi-omap-100k.c
spi-omap-uwire.c
spi-omap2-mcspi.c	spi: omap: Allocate bus number from spi framework	2017-08-18 12:15:41 +01:00
spi-orion.c	spi: Convert to using %pOF instead of full_name	2017-07-19 11:56:23 +01:00
spi-pic32-sqi.c
spi-pic32.c	spi: pic32: fix spelling mistakes on macro names	2017-07-26 13:04:21 +01:00
spi-pl022.c	spi: pl022: constify amba_id	2017-08-23 17:12:05 +01:00
spi-ppc4xx.c
spi-pxa2xx-dma.c
spi-pxa2xx-pci.c
spi-pxa2xx.c	dmaengine: idma64: Use actual device for DMA transfers	2019-06-15 11:54:59 +02:00
spi-pxa2xx.h	spi: pxa2xx: Allow 64-bit DMA	2018-05-22 18:53:56 +02:00
spi-qup.c	spi: qup: fix 64-bit build warning	2017-08-10 15:50:23 +01:00
spi-rb4xx.c
spi-rockchip.c	spi: rockchip: configure CTRLR1 according to size and data frame	2017-08-16 11:58:23 +01:00
spi-rspi.c	spi: rspi: Fix sequencer reset during initialization	2019-05-31 06:47:35 -07:00
spi-s3c24xx-fiq.h
spi-s3c24xx-fiq.S
spi-s3c24xx.c
spi-s3c64xx.c	spi: spi-s3c64xx: Fix system resume support	2018-08-03 07:50:20 +02:00
spi-sc18is602.c
spi-sh-hspi.c
spi-sh-msiof.c	spi: sh-msiof: Fix handling of write value for SISTR register	2018-10-03 17:00:55 -07:00
spi-sh-sci.c
spi-sh.c	spi: spi-sh: fix error return code in spi_sh_probe()	2017-08-09 17:18:06 +01:00
spi-sirf.c	spi: sirf: fix spelling mistake: "registerred" -> "registered"	2017-06-28 20:02:52 +01:00
spi-slave-system-control.c	spi: slave: Add SPI slave handler controlling system state	2017-05-26 13:12:19 +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-st-ssc4.c	spi: st-ssc4: whitespace cleanup	2017-05-26 12:41:07 +01:00
spi-stm32.c	spi: stm32: Fix logical error in stm32_spi_prepare_mbr()	2017-09-13 09:42:27 -07:00
spi-sun4i.c	spi: sun4i: disable clocks in the remove function	2018-02-25 11:08:02 +01:00
spi-sun6i.c	spi: sun6i: disable/unprepare clocks on remove	2018-03-19 08:42:53 +01:00
spi-tegra20-sflash.c	spi: tegra20-sflash: explicitly request exclusive reset control	2017-07-19 17:06:31 +01:00
spi-tegra20-slink.c	spi: tegra20-slink: explicitly enable/disable clock	2018-10-03 17:00:54 -07:00
spi-tegra114.c	spi: tegra114: reset controller on probe	2019-05-31 06:47:32 -07:00
spi-test.h
spi-ti-qspi.c	spi: ti-qspi: Fix mmap read when more than one CS in use	2019-03-23 14:35:19 +01:00
spi-tle62x0.c
spi-topcliff-pch.c	spi : spi-topcliff-pch: Fix to handle empty DMA buffers	2019-05-31 06:47:35 -07:00
spi-txx9.c
spi-xcomm.c
spi-xilinx.c	spi: xilinx: Detect stall with Unknown commands	2017-12-29 17:53:47 +01:00
spi-xlp.c	spi: xlp: fix error return code in xlp_spi_probe()	2017-08-08 11:36:07 +01:00
spi-xtensa-xtfpga.c
spi-zynqmp-gqspi.c
spi.c	spi: Fix zero length xfer bug	2019-05-31 06:47:35 -07:00
spidev.c	Merge branch 'for-spi' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-07-08 10:41:53 -07:00