[PATCH 3/6] [Blackfin] SPI driver: fix bug - PBX cannot work with this SPI framework driver

[Bryan Wu]

PBX 2 SPI device need cs change per word and this regression is due to commit

Signed-off-by: Bryan Wu <[EMAIL PROTECTED]>
---
 drivers/spi/spi_bfin5xx.c |   40 ++++++++++++----------------------------
 1 files changed, 12 insertions(+), 28 deletions(-)

diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
index c3f9ed4..ceb5b53 100644
--- a/drivers/spi/spi_bfin5xx.c
+++ b/drivers/spi/spi_bfin5xx.c
@@ -294,16 +294,14 @@ static void u8_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, (*(u8 *) (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);
 
@@ -342,31 +340,20 @@ static void u8_cs_chg_reader(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();
-
-       /* clear TDBR buffer before read(else it will be shifted out) */
-       write_TDBR(drv_data, 0xFFFF);
+       while (drv_data->rx < drv_data->rx_end) {
+               cs_active(drv_data, chip);
+               read_RDBR(drv_data);    /* kick off */
 
-       cs_active(drv_data, chip);
-       dummy_read(drv_data);
+               while (!(read_STAT(drv_data) & BIT_STAT_RXS))
+                       cpu_relax();
+               while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
+                       cpu_relax();
 
-       while (drv_data->rx < drv_data->rx_end - 1) {
+               *(u8 *) (drv_data->rx) = read_SHAW(drv_data);
                cs_deactive(drv_data, chip);
 
-               while (!(read_STAT(drv_data) & BIT_STAT_RXS))
-                       cpu_relax();
-               cs_active(drv_data, chip);
-               *(u8 *) (drv_data->rx) = read_RDBR(drv_data);
                ++drv_data->rx;
        }
-       cs_deactive(drv_data, chip);
-
-       while (!(read_STAT(drv_data) & BIT_STAT_RXS))
-               cpu_relax();
-       *(u8 *) (drv_data->rx) = read_SHAW(drv_data);
-       ++drv_data->rx;
 }
 
 static void u8_duplex(struct driver_data *drv_data)
@@ -392,15 +379,12 @@ static void u8_cs_chg_duplex(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->rx < drv_data->rx_end) {
                cs_active(drv_data, chip);
 
                write_TDBR(drv_data, (*(u8 *) (drv_data->tx)));
-               while (read_STAT(drv_data) & BIT_STAT_TXS)
+
+               while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
                        cpu_relax();
                while (!(read_STAT(drv_data) & BIT_STAT_RXS))
                        cpu_relax();
-- 
1.5.3.4
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