[PATCH 16/18] spi: stm32: always perform registers configuration prior to transfer

[Alain Volmat]

SPI registers content may have been lost upon suspend/resume sequence.
So, always compute and apply the necessary configuration in
stm32_spi_transfer_one_setup routine.

Signed-off-by: Alain Volmat <alain.vol...@st.com>
---
 drivers/spi/spi-stm32.c | 42 +++++++++++++++++-------------------------
 1 file changed, 17 insertions(+), 25 deletions(-)

diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c
index 2665d8d7f318..177f82700de0 100644
--- a/drivers/spi/spi-stm32.c
+++ b/drivers/spi/spi-stm32.c
@@ -1579,41 +1579,33 @@ static int stm32_spi_transfer_one_setup(struct 
stm32_spi *spi,
        unsigned long flags;
        unsigned int comm_type;
        int nb_words, ret = 0;
+       int mbr;
 
        spin_lock_irqsave(&spi->lock, flags);
 
        spi->cur_xferlen = transfer->len;
 
-       if (spi->cur_bpw != transfer->bits_per_word) {
-               spi->cur_bpw = transfer->bits_per_word;
-               spi->cfg->set_bpw(spi);
-       }
-
-       if (spi->cur_speed != transfer->speed_hz) {
-               int mbr;
-
-               /* Update spi->cur_speed with real clock speed */
-               mbr = stm32_spi_prepare_mbr(spi, transfer->speed_hz,
-                                           spi->cfg->baud_rate_div_min,
-                                           spi->cfg->baud_rate_div_max);
-               if (mbr < 0) {
-                       ret = mbr;
-                       goto out;
-               }
+       spi->cur_bpw = transfer->bits_per_word;
+       spi->cfg->set_bpw(spi);
 
-               transfer->speed_hz = spi->cur_speed;
-               stm32_spi_set_mbr(spi, mbr);
+       /* Update spi->cur_speed with real clock speed */
+       mbr = stm32_spi_prepare_mbr(spi, transfer->speed_hz,
+                                   spi->cfg->baud_rate_div_min,
+                                   spi->cfg->baud_rate_div_max);
+       if (mbr < 0) {
+               ret = mbr;
+               goto out;
        }
 
-       comm_type = stm32_spi_communication_type(spi_dev, transfer);
-       if (spi->cur_comm != comm_type) {
-               ret = spi->cfg->set_mode(spi, comm_type);
+       transfer->speed_hz = spi->cur_speed;
+       stm32_spi_set_mbr(spi, mbr);
 
-               if (ret < 0)
-                       goto out;
+       comm_type = stm32_spi_communication_type(spi_dev, transfer);
+       ret = spi->cfg->set_mode(spi, comm_type);
+       if (ret < 0)
+               goto out;
 
-               spi->cur_comm = comm_type;
-       }
+       spi->cur_comm = comm_type;
 
        if (spi->cfg->set_data_idleness)
                spi->cfg->set_data_idleness(spi, transfer->len);
-- 
2.7.4