From e6811d1d7a6a38ee637fe219c3b67dbfe17e8b3f Mon Sep 17 00:00:00 2001 From: Laxman Dewangan Date: Fri, 9 Nov 2012 14:36:45 +0530 Subject: spi: make sure all transfer has bits_per_word set When spi client does the spi transfer and does not sets the bits_per_word for each transfer then set it as default of spi device in spi core before calling low level transfer. Removing the similar code from spi-tegra20-slink driver as it is not required. Signed-off-by: Laxman Dewangan Signed-off-by: Mark Brown --- drivers/spi/spi.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) (limited to 'drivers/spi/spi.c') diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 84c2861d6f4..518e5955664 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1190,6 +1190,7 @@ EXPORT_SYMBOL_GPL(spi_setup); static int __spi_async(struct spi_device *spi, struct spi_message *message) { struct spi_master *master = spi->master; + struct spi_transfer *xfer; /* Half-duplex links include original MicroWire, and ones with * only one data pin like SPI_3WIRE (switches direction) or where @@ -1198,7 +1199,6 @@ static int __spi_async(struct spi_device *spi, struct spi_message *message) */ if ((master->flags & SPI_MASTER_HALF_DUPLEX) || (spi->mode & SPI_3WIRE)) { - struct spi_transfer *xfer; unsigned flags = master->flags; list_for_each_entry(xfer, &message->transfers, transfer_list) { @@ -1211,6 +1211,15 @@ static int __spi_async(struct spi_device *spi, struct spi_message *message) } } + /** + * Set transfer bits_per_word as spi device default if it is not + * set for this transfer. + */ + list_for_each_entry(xfer, &message->transfers, transfer_list) { + if (!xfer->bits_per_word) + xfer->bits_per_word = spi->bits_per_word; + } + message->spi = spi; message->status = -EINPROGRESS; return master->transfer(spi, message); -- cgit v1.2.3-18-g5258 From caae070c48f39b4f7312e7473f6d3576f426e7fb Mon Sep 17 00:00:00 2001 From: Laxman Dewangan Date: Fri, 9 Nov 2012 14:35:22 +0530 Subject: spi: Dont call master->setup if not populated Currently the master->setup() is called unconditionally. The assumption is that every driver need to implement this callback. This encourages drivers to populate empty functions to prevent crashing. This patch prevents the call of master->setup() if it is not populated. Signed-off-by: Laxman Dewangan Signed-off-by: Mark Brown --- drivers/spi/spi.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'drivers/spi/spi.c') diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 84c2861d6f4..619c7df0d27 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1156,7 +1156,7 @@ EXPORT_SYMBOL_GPL(spi_busnum_to_master); int spi_setup(struct spi_device *spi) { unsigned bad_bits; - int status; + int status = 0; /* help drivers fail *cleanly* when they need options * that aren't supported with their current master @@ -1171,7 +1171,8 @@ int spi_setup(struct spi_device *spi) if (!spi->bits_per_word) spi->bits_per_word = 8; - status = spi->master->setup(spi); + if (spi->master->setup) + status = spi->master->setup(spi); dev_dbg(&spi->dev, "setup mode %d, %s%s%s%s" "%u bits/w, %u Hz max --> %d\n", -- cgit v1.2.3-18-g5258