Commit 3bd4f277 authored by Jarkko Nikula's avatar Jarkko Nikula Committed by Wolfram Sang
Browse files

i2c: designware: Call i2c_dw_clk_rate() only once in i2c_dw_init_master()



This is rather readability update than micro-optimization, or if not
optimization at all. We take the input clock rate to a variable and pass
that to SCL timing parameter calculation functions.

Reviewed-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarJarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 83b2cb48
......@@ -55,6 +55,7 @@ static void i2c_dw_configure_fifo_master(struct dw_i2c_dev *dev)
*/
static int i2c_dw_init_master(struct dw_i2c_dev *dev)
{
u32 ic_clk = i2c_dw_clk_rate(dev);
u32 hcnt, lcnt;
u32 reg, comp_param1;
u32 sda_falling_time, scl_falling_time;
......@@ -79,12 +80,12 @@ static int i2c_dw_init_master(struct dw_i2c_dev *dev)
hcnt = dev->ss_hcnt;
lcnt = dev->ss_lcnt;
} else {
hcnt = i2c_dw_scl_hcnt(i2c_dw_clk_rate(dev),
hcnt = i2c_dw_scl_hcnt(ic_clk,
4000, /* tHD;STA = tHIGH = 4.0 us */
sda_falling_time,
0, /* 0: DW default, 1: Ideal */
0); /* No offset */
lcnt = i2c_dw_scl_lcnt(i2c_dw_clk_rate(dev),
lcnt = i2c_dw_scl_lcnt(ic_clk,
4700, /* tLOW = 4.7 us */
scl_falling_time,
0); /* No offset */
......@@ -101,12 +102,12 @@ static int i2c_dw_init_master(struct dw_i2c_dev *dev)
hcnt = dev->fs_hcnt;
lcnt = dev->fs_lcnt;
} else {
hcnt = i2c_dw_scl_hcnt(i2c_dw_clk_rate(dev),
hcnt = i2c_dw_scl_hcnt(ic_clk,
600, /* tHD;STA = tHIGH = 0.6 us */
sda_falling_time,
0, /* 0: DW default, 1: Ideal */
0); /* No offset */
lcnt = i2c_dw_scl_lcnt(i2c_dw_clk_rate(dev),
lcnt = i2c_dw_scl_lcnt(ic_clk,
1300, /* tLOW = 1.3 us */
scl_falling_time,
0); /* No offset */
......
Supports Markdown
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment