i2c: designware: Use DIV_ROUND_CLOSEST() macro

stable inclusion
from stable-v5.10.166
commit 8949ef3a7a0c938e3813f79085af97f32d060347
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7TH9O

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=8949ef3a7a0c938e3813f79085af97f32d060347

--------------------------------

[ Upstream commit c045214a ]

Instead of open-coding DIV_ROUND_CLOSEST() and similar use the macros directly.
While at it, replace numbers with predefined SI metric prefixes.

No functional change intended.
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NWolfram Sang <wsa@kernel.org>
Stable-dep-of: c8c37bc5 ("i2c: designware: use casting of u64 in clock multiplication to avoid overflow")
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: Nsanglipeng <sanglipeng1@jd.com>

drivers/i2c/busses/i2c-designware-common.c

@@ -24,6 +24,7 @@
 #include <linux/regmap.h>
 #include <linux/swab.h>
 #include <linux/types.h>
+#include <linux/units.h>
 
 #include "i2c-designware-core.h"
 
@@ -347,7 +348,7 @@ u32 i2c_dw_scl_hcnt(u32 ic_clk, u32 tSYMBOL, u32 tf, int cond, int offset)
 		 *
 		 * If your hardware is free from tHD;STA issue, try this one.
 		 */
-		return (ic_clk * tSYMBOL + 500000) / 1000000 - 8 + offset;
+		return DIV_ROUND_CLOSEST(ic_clk * tSYMBOL, MICRO) - 8 + offset;
 	else
 		/*
 		 * Conditional expression:
@@ -363,8 +364,7 @@ u32 i2c_dw_scl_hcnt(u32 ic_clk, u32 tSYMBOL, u32 tf, int cond, int offset)
 		 * The reason why we need to take into account "tf" here,
 		 * is the same as described in i2c_dw_scl_lcnt().
 		 */
-		return (ic_clk * (tSYMBOL + tf) + 500000) / 1000000
-			- 3 + offset;
+		return DIV_ROUND_CLOSEST(ic_clk * (tSYMBOL + tf), MICRO) - 3 + offset;
 }
 
 u32 i2c_dw_scl_lcnt(u32 ic_clk, u32 tLOW, u32 tf, int offset)
@@ -380,7 +380,7 @@ u32 i2c_dw_scl_lcnt(u32 ic_clk, u32 tLOW, u32 tf, int offset)
 	 * account the fall time of SCL signal (tf).  Default tf value
 	 * should be 0.3 us, for safety.
 	 */
-	return ((ic_clk * (tLOW + tf) + 500000) / 1000000) - 1 + offset;
+	return DIV_ROUND_CLOSEST(ic_clk * (tLOW + tf), MICRO) - 1 + offset;
 }
 
 int i2c_dw_set_sda_hold(struct dw_i2c_dev *dev)

drivers/i2c/busses/i2c-designware-platdrv.c

@@ -32,12 +32,13 @@
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/suspend.h>
+#include <linux/units.h>
 
 #include "i2c-designware-core.h"
 
 static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
 {
-	return clk_get_rate(dev->clk)/1000;
+	return clk_get_rate(dev->clk) / KILO;
 }
 
 #ifdef CONFIG_ACPI
@@ -284,7 +285,7 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
 
 		if (!dev->sda_hold_time && t->sda_hold_ns)
 			dev->sda_hold_time =
-				div_u64(clk_khz * t->sda_hold_ns + 500000, 1000000);
+				DIV_S64_ROUND_CLOSEST(clk_khz * t->sda_hold_ns, MICRO);
 	}
 
 	adap = &dev->adapter;