i2c-s3c2410: sda_delay should be in ns, not clock ticks

The sda_delay field should be specified in ns, not in clock ticks
as when using cpufreq we could be changing the bus rate.

Signed-off-by: Ben Dooks <ben@simtec.co.uk>

3 files changed, 21 insertions, 7 deletions

diff --git a/arch/arm/plat-s3c/dev-i2c0.c b/arch/arm/plat-s3c/dev-i2c0.c
index fe327074037e..8eecb466ab4c 100644
--- a/arch/arm/plat-s3c/dev-i2c0.c
+++ b/arch/arm/plat-s3c/dev-i2c0.c
@@ -52,7 +52,7 @@ static struct s3c2410_platform_i2c default_i2c_data0 __initdata = {
         .slave_addr     = 0x10,
         .bus_freq       = 100*1000,
         .max_freq       = 400*1000,
-        .sda_delay      = S3C2410_IICLC_SDA_DELAY5 | S3C2410_IICLC_FILTER_ON,
+        .sda_delay      = 100,
 };
 
 void __init s3c_i2c0_set_platdata(struct s3c2410_platform_i2c *pd)
diff --git a/arch/arm/plat-s3c/dev-i2c1.c b/arch/arm/plat-s3c/dev-i2c1.c
index 2387fbf57af6..4536e5bb50e5 100644
--- a/arch/arm/plat-s3c/dev-i2c1.c
+++ b/arch/arm/plat-s3c/dev-i2c1.c
@@ -49,7 +49,7 @@ static struct s3c2410_platform_i2c default_i2c_data1 __initdata = {
         .slave_addr     = 0x10,
         .bus_freq       = 100*1000,
         .max_freq       = 400*1000,
-        .sda_delay      = S3C2410_IICLC_SDA_DELAY5 | S3C2410_IICLC_FILTER_ON,
+        .sda_delay      = 100,
 };
 
 void __init s3c_i2c1_set_platdata(struct s3c2410_platform_i2c *pd)
diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index 5b7f95641ba4..9d797561de5f 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -663,6 +663,23 @@ static int s3c24xx_i2c_clockrate(struct s3c24xx_i2c *i2c, unsigned int *got)
 
         writel(iiccon, i2c->regs + S3C2410_IICCON);
 
+        if (s3c24xx_i2c_is2440(i2c)) {
+                unsigned long sda_delay;
+
+                if (pdata->sda_delay) {
+                        sda_delay = (freq / 1000) * pdata->sda_delay;
+                        sda_delay /= 1000000;
+                        sda_delay = DIV_ROUND_UP(sda_delay, 5);
+                        if (sda_delay > 3)
+                                sda_delay = 3;
+                        sda_delay |= S3C2410_IICLC_FILTER_ON;
+                } else
+                        sda_delay = 0;
+
+                dev_dbg(i2c->dev, "IICLC=%08lx\n", sda_delay);
+                writel(sda_delay, i2c->regs + S3C2440_IICLC);
+        }
+
         return 0;
 }
 
@@ -769,11 +786,8 @@ static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
 
         /* check for s3c2440 i2c controller  */
 
-        if (s3c24xx_i2c_is2440(i2c)) {
-                dev_dbg(i2c->dev, "S3C2440_IICLC=%08x\n", pdata->sda_delay);
-
-                writel(pdata->sda_delay, i2c->regs + S3C2440_IICLC);
-        }
+        if (s3c24xx_i2c_is2440(i2c))
+                writel(0x0, i2c->regs + S3C2440_IICLC);
 
         return 0;
 }