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authorBarry Song <barry.song@analog.com>2009-11-30 03:49:41 +0000
committerMike Frysinger <vapier@gentoo.org>2010-10-18 02:49:37 -0400
commit9677b0de10433d31e05864dfb4bf33d0c27f752a (patch)
treea2689c90aa902b1cb6c0a3fd0345a9fd117930b1
parentb052fd0a44354c655eb98fd715ef52857631dfef (diff)
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>
-rw-r--r--drivers/spi/spi_bfin5xx.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
index c23ac3b9053..54f9dbbc52e 100644
--- 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);