spi: dw: refactor code that handles clk_div

This patch does the following changes:

a) the calculation of clk_div is simplified to oneliner;

b) chip->clk_div is updated if clk_div is not zero, therefore the condition is
   simplified by using chip->clk_div in both cases;

c) while here, the redundant parentheses are removed.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index 0febb97..0e0c48b 100644 (file)
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -416,12 +416,11 @@ static void pump_transfers(unsigned long data)
        if (transfer->speed_hz) {
                speed = chip->speed_hz;
 
-               if ((transfer->speed_hz != speed) || (!chip->clk_div)) {
+               if ((transfer->speed_hz != speed) || !chip->clk_div) {
                        speed = transfer->speed_hz;
 
                        /* clk_div doesn't support odd number */
-                       clk_div = dws->max_freq / speed;
-                       clk_div = (clk_div + 1) & 0xfffe;
+                       clk_div = (dws->max_freq / speed + 1) & 0xfffe;
 
                        chip->speed_hz = speed;
                        chip->clk_div = clk_div;
@@ -480,7 +479,7 @@ static void pump_transfers(unsigned long data)
                if (dw_readw(dws, DW_SPI_CTRL0) != cr0)
                        dw_writew(dws, DW_SPI_CTRL0, cr0);
 
-               spi_set_clk(dws, clk_div ? clk_div : chip->clk_div);
+               spi_set_clk(dws, chip->clk_div);
                spi_chip_sel(dws, spi, 1);
 
                /* Set the interrupt mask, for poll mode just disable all int */