[Armadeus-commitlog] SF.net SVN: armadeus: [818] trunk/target/linux/modules/isp1761/hal/hal_imx. c

[<th...@us...>]

Revision: 818
          http://armadeus.svn.sourceforge.net/armadeus/?rev=818&view=rev
Author:   thom25
Date:     2008-06-02 08:48:28 -0700 (Mon, 02 Jun 2008)

Log Message:
-----------
[LINUX] Fix bug 1960067: ISP1761 scratch register

Modified Paths:
--------------
    trunk/target/linux/modules/isp1761/hal/hal_imx.c

Modified: trunk/target/linux/modules/isp1761/hal/hal_imx.c
===================================================================
--- trunk/target/linux/modules/isp1761/hal/hal_imx.c	2008-06-02 15:24:26 UTC (rev 817)
+++ trunk/target/linux/modules/isp1761/hal/hal_imx.c	2008-06-02 15:48:28 UTC (rev 818)
@@ -834,15 +834,18 @@
 #endif
 
     loc_dev = &(isp1761_loc_dev[ISP1761_HC]);
-    isp1761_reg_write16(loc_dev, HC_SCRATCH_REG, 0xFACE);
-    udelay(100);
+    isp1761_reg_write16(loc_dev, HC_SCRATCH_REG, 0xFACE);
+    /* perform a read of the chip ID to avoir bus hold effect when
+    * reading back the scratch register */
+    isp1761_reg_read16(loc_dev, HC_CHIP_ID_REG, reg_data);
+    udelay(100); 
     reg_data = isp1761_reg_read16(loc_dev, HC_SCRATCH_REG,reg_data);
 
     /* Host Controller presence is detected by writing to scratch register
      * and reading back and checking the contents are same or not
      */
     if(reg_data != 0xFACE) {
-        err("%s scratch register mismatch %x",
+        err("%s scratch register mismatch %x. Unable to find the ISP176x device",
                 isp1761_driver_name,reg_data);
         status = -ENODEV;
         goto clean;


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