From: Alain Volmat alain.volmat@st.com
[ Upstream commit 60ccb3515fc61a0124c70aa37317f75b67560024 ]
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.volmat@st.com Link: https://lore.kernel.org/r/1597043558-29668-6-git-send-email-alain.volmat@st.... Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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 50ef03a8252d7..8146c2d91d307 100644 --- a/drivers/spi/spi-stm32.c +++ b/drivers/spi/spi-stm32.c @@ -1590,41 +1590,33 @@ 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);