spi/bfin_spi: sync hardware state before reprogramming everything

Sometimes under load, the Blackfin core is able to send SPI register
updates out before the controller is actually disabled.  So when we
go to reprogram the entire state (to switch to a different slave),
make sure we sync after disabling the controller.

Signed-off-by: Barry Song <barry.song@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
index c23ac3b905332bf3b5b228da39d1523687ac3c0c..54f9dbbc52e9c44f8c37215f5477777bdbcfdce9 100644 (file)
--- a/drivers/spi/spi_bfin5xx.c
+++ b/drivers/spi/spi_bfin5xx.c
@@ -247,6 +247,8 @@ static void bfin_spi_restore_state(struct master_data *drv_data)
        bfin_spi_disable(drv_data);
        dev_dbg(&drv_data->pdev->dev, "restoring spi ctl state\n");
 
+       SSYNC();
+
        /* Load the registers */
        write_CTRL(drv_data, chip->ctl_reg);
        write_BAUD(drv_data, chip->baud);