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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: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Jarkko Nikula 2018-06-19 14:23:21 +03:00 committed by Wolfram Sang
parent 83b2cb48cb
commit 3bd4f27727
1 changed files with 5 additions and 4 deletions
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9
drivers/i2c/busses/i2c-designware-master.c
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@ -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) static int i2c_dw_init_master(struct dw_i2c_dev *dev)
{ {
u32 ic_clk = i2c_dw_clk_rate(dev);
u32 hcnt, lcnt; u32 hcnt, lcnt;
u32 reg, comp_param1; u32 reg, comp_param1;
u32 sda_falling_time, scl_falling_time; 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; hcnt = dev->ss_hcnt;
lcnt = dev->ss_lcnt; lcnt = dev->ss_lcnt;
} else { } 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 */ 4000, /* tHD;STA = tHIGH = 4.0 us */
sda_falling_time, sda_falling_time,
0, /* 0: DW default, 1: Ideal */ 0, /* 0: DW default, 1: Ideal */
0); /* No offset */ 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 */ 4700, /* tLOW = 4.7 us */
scl_falling_time, scl_falling_time,
0); /* No offset */ 0); /* No offset */
@ -101,12 +102,12 @@ static int i2c_dw_init_master(struct dw_i2c_dev *dev)
hcnt = dev->fs_hcnt; hcnt = dev->fs_hcnt;
lcnt = dev->fs_lcnt; lcnt = dev->fs_lcnt;
} else { } 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 */ 600, /* tHD;STA = tHIGH = 0.6 us */
sda_falling_time, sda_falling_time,
0, /* 0: DW default, 1: Ideal */ 0, /* 0: DW default, 1: Ideal */
0); /* No offset */ 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 */ 1300, /* tLOW = 1.3 us */
scl_falling_time, scl_falling_time,
0); /* No offset */ 0); /* No offset */