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linux/drivers/spi
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Anatolij Gustschin a41c384e83 spi/mpc512x-psc: optionally keep PSC SS asserted across xfer segmensts 
commit 1ad849aee5 upstream.

Some SPI slave devices require asserted chip select signal across
multiple transfer segments of an SPI message. Currently the driver
always de-asserts the internal SS signal for every single transfer
segment of the message and ignores the 'cs_change' flag of the
transfer description. Disable the internal chip select (SS) only
if this is needed and indicated by the 'cs_change' flag.

Without this change, each partial transfer of a surrounding
multi-part SPI transaction might erroneously change the SS
signal, which might prevent slaves from answering the request
that was sent in a previous transfer segment because the
transaction could be considered aborted (SS was de-asserted
before reading the response).

Reported-by: Gerhard Sittig <gerhard.sittig@ifm.com>
Signed-off-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-04-12 09:38:43 -07:00
..
Kconfig spi/bfin5xx: rename config macro name for bfin5xx spi controller driver 2012-04-27 12:15:45 -06:00
Makefile spi/bfin5xx: rename config macro name for bfin5xx spi controller driver 2012-04-27 12:15:45 -06:00
spi-altera.c spi: Add module.h to implicit users in drivers/spi 2011-10-31 19:32:17 -04:00
spi-ath79.c spi/ath79: fix compile error due to missing include 2011-12-07 21:57:49 +01:00
spi-atmel.c atmel/spi: fix missing probe 2011-11-09 23:02:12 +08:00
spi-au1550.c spi: Add module.h to implicit users in drivers/spi 2011-10-31 19:32:17 -04:00
spi-bcm63xx.c spi/bcm63xx: set master driver mode_bits. 2012-04-27 11:19:15 -06:00
spi-bfin-sport.c spi/spi_bfin_sport: drop bits_per_word from client data 2012-04-27 12:17:25 -06:00
spi-bfin5xx.c spi/spi-bfin5xx: Fix flush of last bit after each spi transfer 2012-04-27 12:20:39 -06:00
spi-bitbang-txrx.h spi: reorganize drivers 2011-06-06 01:16:30 -06:00
spi-bitbang.c spi: Add module.h to implicit users in drivers/spi 2011-10-31 19:32:17 -04:00
spi-butterfly.c spi: Add module.h to implicit users in drivers/spi 2011-10-31 19:32:17 -04:00
spi-coldfire-qspi.c drivercore: Add helper macro for platform_driver boilerplate 2011-10-25 00:35:47 +02:00
spi-davinci.c spi/davinci: Fix DMA API usage in davinci 2012-03-30 16:46:22 -06:00
spi-dw-mid.c dmaengine/dma_slave: introduce inline wrappers 2012-03-21 19:20:22 +05:30
spi-dw-mmio.c spi: Add module.h to implicit users in drivers/spi 2011-10-31 19:32:17 -04:00
spi-dw-pci.c spi: Convert to DEFINE_PCI_DEVICE_TABLE 2012-03-09 15:33:15 -07:00
spi-dw.c simple_open: automatically convert to simple_open() 2012-04-05 15:25:50 -07:00
spi-dw.h spi: spi-dw: fix all sparse warnings 2011-09-21 09:41:48 -06:00
spi-ep93xx.c spi/spi-ep93xx.c: use dma_transfer_direction instead of dma_data_direction 2012-04-27 11:11:28 -06:00
spi-fsl-espi.c spi/fsl-espi: Make sure pm is within 2..32 2012-03-15 15:14:24 -06:00
spi-fsl-lib.c spi: reorganize drivers 2011-06-06 01:16:30 -06:00
spi-fsl-lib.h spi: reorganize drivers 2011-06-06 01:16:30 -06:00
spi-fsl-spi.c spi/spi-fsl-spi: reference correct pdata in fsl_spi_cs_control 2012-06-01 15:18:25 +08:00
spi-gpio.c spi/gpio: fix section mismatch warning 2011-12-07 22:17:39 +01:00
spi-imx.c spi/imx: prevent NULL pointer dereference in spi_imx_probe() 2012-04-10 22:17:15 -06:00
spi-lm70llp.c spi: reorganize drivers 2011-06-06 01:16:30 -06:00
spi-mpc52xx-psc.c drivercore: Add helper macro for platform_driver boilerplate 2011-10-25 00:35:47 +02:00
spi-mpc52xx.c drivercore: Add helper macro for platform_driver boilerplate 2011-10-25 00:35:47 +02:00
spi-mpc512x-psc.c spi/mpc512x-psc: optionally keep PSC SS asserted across xfer segmensts 2013-04-12 09:38:43 -07:00
spi-nuc900.c spi/nuc900: Remove unnecessary memset of struct nuc900_spi 2012-02-01 17:10:52 -07:00
spi-oc-tiny.c spi: Add module.h to implicit users in drivers/spi 2011-10-31 19:32:17 -04:00
spi-omap-100k.c spi: reorganize drivers 2011-06-06 01:16:30 -06:00
spi-omap-uwire.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
spi-omap2-mcspi.c spi/omap: Add DT support to McSPI driver 2012-02-15 12:57:00 -07:00
spi-orion.c ARM: orion: spi: remove enable_clock_fix which is not used 2012-03-16 04:28:40 +00:00
spi-pl022.c spi/pl022: disable port when unused 2012-08-09 08:31:38 -07:00
spi-ppc4xx.c drivercore: Add helper macro for platform_driver boilerplate 2011-10-25 00:35:47 +02:00
spi-pxa2xx-pci.c spi: Convert to DEFINE_PCI_DEVICE_TABLE 2012-03-09 15:33:15 -07:00
spi-pxa2xx.c spi: reorganize drivers 2011-06-06 01:16:30 -06:00
spi-rspi.c spi: add support for Renesas RSPI 2012-03-07 19:18:49 -07:00
spi-s3c24xx-fiq.h spi: reorganize drivers 2011-06-06 01:16:30 -06:00
spi-s3c24xx-fiq.S spi: reorganize drivers 2011-06-06 01:16:30 -06:00
spi-s3c24xx.c ARM: S3C24XX: move spi-s3c24xx platdata out of mach 2012-01-31 20:06:27 +09:00
spi-s3c64xx.c spi/s3c64xx: modified error interrupt handling and init 2013-04-12 09:38:43 -07:00
spi-sh-hspi.c spi: sh-hspi: modify write/read method 2012-03-15 03:41:50 -06:00
spi-sh-msiof.c spi: Add module.h to implicit users in drivers/spi 2011-10-31 19:32:17 -04:00
spi-sh-sci.c spi: Add module.h to implicit users in drivers/spi 2011-10-31 19:32:17 -04:00
spi-sh.c spi/spi-sh: add IORESOURCE_MEM_TYPE_MASK decoding for access size 2012-03-07 19:18:45 -07:00
spi-sirf.c SPI: add CSR SiRFprimaII SPI controller driver 2012-03-09 14:51:11 -07:00
spi-stmp.c drivercore: Add helper macro for platform_driver boilerplate 2011-10-25 00:35:47 +02:00
spi-tegra.c drivercore: Add helper macro for platform_driver boilerplate 2011-10-25 00:35:47 +02:00
spi-ti-ssp.c spi: Add module.h to implicit users in drivers/spi 2011-10-31 19:32:17 -04:00
spi-tle62x0.c spi: Add module.h to implicit users in drivers/spi 2011-10-31 19:32:17 -04:00
spi-topcliff-pch.c Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma 2012-03-29 15:34:57 -07:00
spi-txx9.c spi: Add module.h to implicit users in drivers/spi 2011-10-31 19:32:17 -04:00
spi-xilinx.c drivercore: Add helper macro for platform_driver boilerplate 2011-10-25 00:35:47 +02:00
spi.c spi: remove redundant variable assignment 2012-03-15 03:30:33 -06:00
spidev.c spi: reorganize drivers 2011-06-06 01:16:30 -06:00