Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=4fd432d9c7ac9a14e750d2ab0c91bc151e9af32e Commit: 4fd432d9c7ac9a14e750d2ab0c91bc151e9af32e Parent: e26aa015dd34d5768b80815836ad60e8495e9553 Author: Bryan Wu <[EMAIL PROTECTED]> AuthorDate: Wed Feb 6 01:38:19 2008 -0800 Committer: Linus Torvalds <[EMAIL PROTECTED]> CommitDate: Wed Feb 6 10:41:11 2008 -0800
spi_bfin: wait for tx to complete on full duplex paths Full duplex SPI operation should not read a dummy byte at the first transfer. Bug and fix by Jean-Christian de Rivaz <[EMAIL PROTECTED]>: http://blackfin.uclinux.org/gf/project/uclinux-dist/tracker/?action=TrackerItemEdit&tracker_item_id=3678 Signed-off-by: Jean-Christian de Rivaz <[EMAIL PROTECTED]> Signed-off-by: Bryan Wu <[EMAIL PROTECTED]> Signed-off-by: David Brownell <[EMAIL PROTECTED]> Signed-off-by: Andrew Morton <[EMAIL PROTECTED]> Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]> --- drivers/spi/spi_bfin5xx.c | 18 +++--------------- 1 files changed, 3 insertions(+), 15 deletions(-) diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c index ce4692c..f61b5ee 100644 --- a/drivers/spi/spi_bfin5xx.c +++ b/drivers/spi/spi_bfin5xx.c @@ -358,14 +358,10 @@ static void u8_cs_chg_reader(struct driver_data *drv_data) static void u8_duplex(struct driver_data *drv_data) { - /* poll for SPI completion before start */ - while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) - cpu_relax(); - /* in duplex mode, clk is triggered by writing of TDBR */ while (drv_data->rx < drv_data->rx_end) { write_TDBR(drv_data, (*(u8 *) (drv_data->tx))); - while (read_STAT(drv_data) & BIT_STAT_TXS) + while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) cpu_relax(); while (!(read_STAT(drv_data) & BIT_STAT_RXS)) cpu_relax(); @@ -495,14 +491,10 @@ static void u16_cs_chg_reader(struct driver_data *drv_data) static void u16_duplex(struct driver_data *drv_data) { - /* poll for SPI completion before start */ - while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) - cpu_relax(); - /* in duplex mode, clk is triggered by writing of TDBR */ while (drv_data->tx < drv_data->tx_end) { write_TDBR(drv_data, (*(u16 *) (drv_data->tx))); - while (read_STAT(drv_data) & BIT_STAT_TXS) + while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) cpu_relax(); while (!(read_STAT(drv_data) & BIT_STAT_RXS)) cpu_relax(); @@ -516,15 +508,11 @@ static void u16_cs_chg_duplex(struct driver_data *drv_data) { struct chip_data *chip = drv_data->cur_chip; - /* poll for SPI completion before start */ - while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) - cpu_relax(); - while (drv_data->tx < drv_data->tx_end) { cs_active(drv_data, chip); write_TDBR(drv_data, (*(u16 *) (drv_data->tx))); - while (read_STAT(drv_data) & BIT_STAT_TXS) + while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) cpu_relax(); while (!(read_STAT(drv_data) & BIT_STAT_RXS)) cpu_relax(); - To unsubscribe from this list: send the line "unsubscribe git-commits-head" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html