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@xxxxxxxxxxxxxxx>
Signed-off-by: Jarkko Nikula <jarkko.nikula@xxxxxxxxxxxxxxx>
---
v3:
- Do only s/i2c_dw_clk_rate(dev)/ic_clk/ and leave out indentation
change.
v2:
- Add comment why i2c_dw_scl_hcnt()/i2c_dw_scl_lcnt() calls are moved to
own lines.
---
drivers/i2c/busses/i2c-designware-master.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/i2c/busses/i2c-designware-master.c b/drivers/i2c/busses/i2c-designware-master.c
index 3a7c184f24c8..cb3ac1f39cb6 100644
--- a/drivers/i2c/busses/i2c-designware-master.c
+++ b/drivers/i2c/busses/i2c-designware-master.c
@@ -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 */
--
2.17.1
