fix bug in xpt2046_ts.c, move ahead data discard.

The configuration for XPT2046 TS driver with CALIBRATION is "XPT2046 based touchscreens: XPT2046 SPI Interface".
In this modification,  the first raw data is discarded before processed, so that it can work on IT50.

diff --git a/drivers/input/touchscreen/xpt2046_ts.c b/drivers/input/touchscreen/xpt2046_ts.c
index 3b2d2b84fc3011897ed26f8b8e2a683cc35a526d..0bc38b8bc676b190a190aebfde6d50e3b8215190 100755 (executable)
--- a/drivers/input/touchscreen/xpt2046_ts.c
+++ b/drivers/input/touchscreen/xpt2046_ts.c
@@ -394,6 +394,14 @@ static int xpt2046_debounce(void *xpt, int data_idx, int *val)
                abs(ts->last_read - *val),ts->debounce_tol,
                ts->read_rep,ts->debounce_rep);
        
+       /* discard the first sample. */
+        //on info_it50, the top-left area(1cmx1cm top-left square ) is not responding cause the first sample is invalid, @sep 17th
+       if(!ts->read_cnt)
+       {
+               //udelay(100);
+               ts->read_cnt++;
+               return XPT2046_FILTER_REPEAT;
+       }
        if(*val == 4095 || *val == 0)
        {
                ts->read_cnt = 0;
@@ -403,11 +411,12 @@ static int xpt2046_debounce(void *xpt, int data_idx, int *val)
                return XPT2046_FILTER_IGNORE;
        }
        /* discard the first sample. */
-       if(!ts->read_cnt)
+/*     if(!ts->read_cnt)
        {
                ts->read_cnt++;
                return XPT2046_FILTER_REPEAT;
        }
+move discard ahead  */
 
        if (ts->read_cnt==1 || (abs(ts->last_read - *val) > ts->debounce_tol)) {
                /* Start over collecting consistent readings. */