Bugfix in I2C initialisation on S3C2400.

If the bus is blocked because of a previously interrupted
transfer, up to eleven clocks are generated on the I2CSCL
line to complete the transfer and to free the bus.
With this fix pin I2CSCL (PG6) is really configured as GPIO
so the clock pulses are really generated.
Patch by Martin Krause, 04 Apr 2006

diff --git a/CHANGELOG b/CHANGELOG
index c1fc890d4932d8345b3f96bed3a7033a3e3ec910..af8df174d9fcdfb8279ed984a80784852d1f2572 100644 (file)
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -2,6 +2,14 @@
 Changes since U-Boot 1.1.4:
 ======================================================================
 
+* Bugfix in I2C initialisation on S3C2400.
+  If the bus is blocked because of a previously interrupted
+  transfer, up to eleven clocks are generated on the I2CSCL
+  line to complete the transfer and to free the bus.
+  With this fix pin I2CSCL (PG6) is really configured as GPIO
+  so the clock pulses are really generated.
+  Patch by Martin Krause, 04 Apr 2006
+  
 * Fix DDR6 errata on TQM834x boards
   Patch by Thomas Waehner, 07 Mar 2006
 

diff --git a/cpu/arm920t/s3c24x0/i2c.c b/cpu/arm920t/s3c24x0/i2c.c
index ef56cd1c31d0adf5189de9fe37192f45fb65dde4..374b68313711bca01ea9848306ecd87f84828e0a 100644 (file)
--- a/cpu/arm920t/s3c24x0/i2c.c
+++ b/cpu/arm920t/s3c24x0/i2c.c
@@ -153,7 +153,7 @@ void i2c_init (int speed, int slaveadd)
 #endif
 #ifdef CONFIG_S3C2400
                /* set I2CSDA and I2CSCL (PG5, PG6) to GPIO */
-               gpio->PGCON = (gpio->PGCON & ~0x00003c00) | 0x00000c00;
+               gpio->PGCON = (gpio->PGCON & ~0x00003c00) | 0x00001000;
 #endif
 
                /* toggle I2CSCL until bus idle */