From: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Date: Tue, 19 Jun 2018 11:23:21 +0000 (+0300)
Subject: i2c: designware: Call i2c_dw_clk_rate() only once in i2c_dw_init_master()
X-Git-Tag: v4.19~339^2~59
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3bd4f277274bd7dde65879e5c8cd16d0b34eba90;p=platform%2Fkernel%2Flinux-rpi.git

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>
---

diff --git a/drivers/i2c/busses/i2c-designware-master.c b/drivers/i2c/busses/i2c-designware-master.c
index 3a7c184..cb3ac1f 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 */