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authorMike Frysinger <vapier@gentoo.org>2009-12-18 17:43:31 +0000
committerMike Frysinger <vapier@gentoo.org>2010-10-18 02:49:39 -0400
commit5b47bcd48b3bd53c86040321de0d348aadebed87 (patch)
treec852402ea7446fadd274daeb616199ec7837b3bb /drivers/spi
parent033f44bd0ebca1809e8274237a64263d909f01a7 (diff)
spi/bfin_spi: reset ctl_reg bits when setup is run again on a device
During runtime, the spi setup function may be called multiple times on the same device in order to reconfigure some settings on the fly. When this happens, we need to reset the ctl_reg bits so that changing the mode works as expected. Reported-by: Andy Getzendanner <james.getzendanner@students.olin.edu> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi_bfin5xx.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
index 830c7055f15..376f2f09e34 100644
--- a/drivers/spi/spi_bfin5xx.c
+++ b/drivers/spi/spi_bfin5xx.c
@@ -972,6 +972,7 @@ static int bfin_spi_setup(struct spi_device *spi)
struct bfin5xx_spi_chip *chip_info;
struct slave_data *chip = NULL;
struct master_data *drv_data = spi_master_get_devdata(spi->master);
+ u16 bfin_ctl_reg;
int ret = -EINVAL;
/* Only alloc (or use chip_info) on first setup */
@@ -989,6 +990,10 @@ static int bfin_spi_setup(struct spi_device *spi)
chip_info = spi->controller_data;
}
+ /* Let people set non-standard bits directly */
+ bfin_ctl_reg = BIT_CTL_OPENDRAIN | BIT_CTL_EMISO |
+ BIT_CTL_PSSE | BIT_CTL_GM | BIT_CTL_SZ;
+
/* chip_info isn't always needed */
if (chip_info) {
/* Make sure people stop trying to set fields via ctl_reg
@@ -997,13 +1002,11 @@ static int bfin_spi_setup(struct spi_device *spi)
* Not sure if a user actually needs/uses any of these,
* but let's assume (for now) they do.
*/
- if (chip_info->ctl_reg & ~(BIT_CTL_OPENDRAIN | BIT_CTL_EMISO | \
- BIT_CTL_PSSE | BIT_CTL_GM | BIT_CTL_SZ)) {
+ if (chip_info->ctl_reg & ~bfin_ctl_reg) {
dev_err(&spi->dev, "do not set bits in ctl_reg "
"that the SPI framework manages\n");
goto error;
}
-
chip->enable_dma = chip_info->enable_dma != 0
&& drv_data->master_info->enable_dma;
chip->ctl_reg = chip_info->ctl_reg;
@@ -1011,6 +1014,9 @@ static int bfin_spi_setup(struct spi_device *spi)
chip->idle_tx_val = chip_info->idle_tx_val;
chip->pio_interrupt = chip_info->pio_interrupt;
spi->bits_per_word = chip_info->bits_per_word;
+ } else {
+ /* force a default base state */
+ chip->ctl_reg &= bfin_ctl_reg;
}
if (spi->bits_per_word != 8 && spi->bits_per_word != 16) {