[PATCH 15/16] Blackfin SPI Driver: fix bug - spi controller driver does not assert/deassert CS correctly

Bryan Wu
2008-11-18T07:56:59Z

From: Yi Li <yi.li@analog.com>

This bug can be observed when two SPI devices are sharing the spi bus:
One device is set as SPI CS 7, another one is using SPI CS 4.

In spi_bfin5xx.c: cs_active(), cs_deactive() are used to control SPI_FLG
register. From the debug bellow:

cs_active: flag: 0x7f91, chip->flag: 0x7f80, cs: 7
cs_active: flag: 0xef91, chip->flag: 0xef10, cs: 4

When device A (cs_7) activate CS 7, SPI_FLG is set as 0x7f91 (however,
SPI_FLG should be set as 0x7f80, or 0x6f91 if in broadcast mode).

Due to some HW bug (very possibly), if SPI_FLG is set as 0x7f91,
SPISSEL7 is asserted, however SPISSEL4 will be asserted too (I can see
this using the scope). This is unreasonable according to HRM.

Signed-off-by: Yi Li <yi.li@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
---
drivers/spi/spi_bfin5xx.c | 5 ++---
1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
index 9c602ad..8cf5d6e 100644
--- a/drivers/spi/spi_bfin5xx.c
+++ b/drivers/spi/spi_bfin5xx.c
@@ -189,6 +189,7 @@ static void cs_deactive(struct driver_data *drv_data, struct chip_data *chip)
{
u16 flag = read_FLAG(drv_data);

+ flag &= ~chip->flag;
flag |= (chip->flag << 8);

write_FLAG(drv_data, flag);
@@ -1032,7 +1033,6 @@ static int setup(struct spi_device *spi)
struct bfin5xx_spi_chip *chip_info = NULL;
struct chip_data *chip;
struct driver_data *drv_data = spi_master_get_devdata(spi->master);
- u8 spi_flg;

/* Abort device setup if requested features are not supported */
if (spi->mode & ~(SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST)) {
@@ -1115,8 +1115,7 @@ static int setup(struct spi_device *spi)
* SPI_BAUD, not the real baudrate
*/
chip->baud = hz_to_spi_baud(spi->max_speed_hz);
- spi_flg = ~(1 << (spi->chip_select));
- chip->flag = ((u16) spi_flg << 8) | (1 << (spi->chip_select));
+ chip->flag = 1 << (spi->chip_select);
chip->chip_select_num = spi->chip_select;

switch (chip->bits_per_word) {
--
1.5.6.3