diff options
| author | Sonic Zhang <sonic.zhang@analog.com> | 2008-02-06 01:38:20 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-06 10:41:11 -0800 |
| commit | 13f3e642b24632d206fe2f6a5ee8b275ea062790 (patch) | |
| tree | 39f2a7d7db8a68cb433fbc57aef2ce8c3ddd4c20 /drivers/spi | |
| parent | 4fd432d9c7ac9a14e750d2ab0c91bc151e9af32e (diff) | |
| download | linux-13f3e642b24632d206fe2f6a5ee8b275ea062790.tar.gz linux-13f3e642b24632d206fe2f6a5ee8b275ea062790.tar.bz2 linux-13f3e642b24632d206fe2f6a5ee8b275ea062790.zip | |
spi_bfin: wait for tx to complete on write paths
SPI writes should also not return until the last bit is sent.
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi_bfin5xx.c | 22 |
1 files changed, 10 insertions, 12 deletions
diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c index f61b5eeb0427..7a4ace6dba55 100644 --- a/drivers/spi/spi_bfin5xx.c +++ b/drivers/spi/spi_bfin5xx.c @@ -278,16 +278,16 @@ static void u8_writer(struct driver_data *drv_data) dev_dbg(&drv_data->pdev->dev, "cr8-s is 0x%x\n", read_STAT(drv_data)); - /* poll for SPI completion before start */ - while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) - cpu_relax(); - while (drv_data->tx < drv_data->tx_end) { write_TDBR(drv_data, (*(u8 *) (drv_data->tx))); while (read_STAT(drv_data) & BIT_STAT_TXS) cpu_relax(); ++drv_data->tx; } + + /* poll for SPI completion before return */ + while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) + cpu_relax(); } static void u8_cs_chg_writer(struct driver_data *drv_data) @@ -398,32 +398,30 @@ static void u16_writer(struct driver_data *drv_data) dev_dbg(&drv_data->pdev->dev, "cr16 is 0x%x\n", read_STAT(drv_data)); - /* poll for SPI completion before start */ - while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) - cpu_relax(); - while (drv_data->tx < drv_data->tx_end) { write_TDBR(drv_data, (*(u16 *) (drv_data->tx))); while ((read_STAT(drv_data) & BIT_STAT_TXS)) cpu_relax(); drv_data->tx += 2; } + + /* poll for SPI completion before return */ + while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) + cpu_relax(); } static void u16_cs_chg_writer(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)) cpu_relax(); + while (!(read_STAT(drv_data) & BIT_STAT_SPIF)) + cpu_relax(); cs_deactive(drv_data, chip); |