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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>
This commit is contained in:
Andy Shevchenko 2015-02-24 13:32:12 +02:00 committed by Mark Brown
parent ea11370fff
commit 341c7dc7c0
1 changed files with 3 additions and 4 deletions
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7
drivers/spi/spi-dw.c
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@ -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 */