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author | Rui Miguel Silva <rui.silva@linaro.org> | 2016-05-16 10:33:21 +0100 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@google.com> | 2016-05-16 20:02:58 -0700 |
commit | 3a238fc7844f93c799283d8b822178af9638ff0c (patch) | |
tree | ba91a6f0908155ea222c59e9bbbe39e078b0f56b /drivers/staging/greybus/spilib.c | |
parent | greybus: spi: rename rdwr field to xfer_flags (diff) | |
download | linux-dev-3a238fc7844f93c799283d8b822178af9638ff0c.tar.xz linux-dev-3a238fc7844f93c799283d8b822178af9638ff0c.zip |
greybus: spi: add inprogress bit to xfer_flags
When a SPI transfer needs to be split by more than one greybus spi
transfer operation, we need to indicate it so the controller can handle
the chip select lines correctly.
Add a new bit to indicate it, GB_SPI_XFER_INPROGRESS, and create an
helper function to calculate when the transfer is done. As we need this
information also in other places.
Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Diffstat (limited to 'drivers/staging/greybus/spilib.c')
-rw-r--r-- | drivers/staging/greybus/spilib.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/staging/greybus/spilib.c b/drivers/staging/greybus/spilib.c index 9eecbf391259..79ae044b78f3 100644 --- a/drivers/staging/greybus/spilib.c +++ b/drivers/staging/greybus/spilib.c @@ -102,6 +102,17 @@ static void clean_xfer_state(struct gb_spilib *spi) spi->op_timeout = 0; } +static bool is_last_xfer_done(struct gb_spilib *spi) +{ + struct spi_transfer *last_xfer = spi->last_xfer; + + if ((spi->tx_xfer_offset + spi->last_xfer_size == last_xfer->len) || + (spi->rx_xfer_offset + spi->last_xfer_size == last_xfer->len)) + return true; + + return false; +} + static int setup_next_xfer(struct gb_spilib *spi, struct spi_message *msg) { struct spi_transfer *last_xfer = spi->last_xfer; @@ -113,8 +124,7 @@ static int setup_next_xfer(struct gb_spilib *spi, struct spi_message *msg) * if we transferred all content of the last transfer, reset values and * check if this was the last transfer in the message */ - if ((spi->tx_xfer_offset + spi->last_xfer_size == last_xfer->len) || - (spi->rx_xfer_offset + spi->last_xfer_size == last_xfer->len)) { + if (is_last_xfer_done(spi)) { spi->tx_xfer_offset = 0; spi->rx_xfer_offset = 0; spi->op_timeout = 0; @@ -265,6 +275,8 @@ static struct gb_operation *gb_spi_operation_create(struct gb_spilib *spi, gb_xfer->xfer_flags |= GB_SPI_XFER_READ; if (xfer == spi->last_xfer) { + if (!is_last_xfer_done(spi)) + gb_xfer->xfer_flags |= GB_SPI_XFER_INPROGRESS; msg->state = GB_SPI_STATE_OP_DONE; continue; } |