[PATCH v1 06/10] spi: dw: eliminate speed variable in ->transfer_one()

Andy Shevchenko
2015-10-14T20:12:21Z

There is no point to have a separate variable for speed in ->transfer_one().

While here, remove !chip->clk_div from a condition since it is assigned
simultaneously with chip->speed_hz. We can do this safely because
a) transfer speed can't be higher than max_freq and therefore chip->clk_div
can be 0 only when chip->speed_hz is 0, and
b) transfer speed can't be 0, otherwise we will get division by zero
exception.

Signed-off-by: Andy Shevchenko <andriy.shevchenko-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
---
drivers/spi/spi-dw.c | 12 ++++--------
1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index f7e36db..5dae557 100644
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -285,8 +285,7 @@ static int dw_spi_transfer_one(struct spi_master *master,
struct chip_data *chip = spi_get_ctldata(spi);
u8 imask = 0;
u16 txlevel = 0;
- u16 clk_div = 0;
- u32 speed = 0;
+ u16 clk_div;
u32 cr0;
int ret;

@@ -301,14 +300,11 @@ static int dw_spi_transfer_one(struct spi_master *master,
spi_enable_chip(dws, 0);

/* Handle per transfer options for bpw and speed */
- speed = chip->speed_hz;
- if ((transfer->speed_hz != speed) || !chip->clk_div) {
- speed = transfer->speed_hz;
-
+ if (transfer->speed_hz != chip->speed_hz) {
/* clk_div doesn't support odd number */
- clk_div = (dws->max_freq / speed + 1) & 0xfffe;
+ clk_div = (dws->max_freq / transfer->speed_hz + 1) & 0xfffe;

- chip->speed_hz = speed;
+ chip->speed_hz = transfer->speed_hz;
chip->clk_div = clk_div;

spi_set_clk(dws, chip->clk_div);