[PATCH] pxafb: Add hsync time reporting hook

To solve touchscreen interference problems devices like the Sharp Zaurus
SL-C3000 need to know the length of the horitzontal sync pulses.  This patch
adds a hook to pxafb so the touchscreen driver can function correctly.

Signed-Off-By: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 32 insertions, 0 deletions

diff --git a/drivers/video/pxafb.c b/drivers/video/pxafb.c
index 30112816420c..34d4dcc0320a 100644
--- a/drivers/video/pxafb.c
+++ b/drivers/video/pxafb.c
@@ -468,6 +468,36 @@ static inline unsigned int get_pcd(unsigned int pixclock)
 }
 
 /*
+ * Some touchscreens need hsync information from the video driver to
+ * function correctly. We export it here.
+ */
+static inline void set_hsync_time(struct pxafb_info *fbi, unsigned int pcd)
+{
+        unsigned long long htime;
+
+        if ((pcd == 0) || (fbi->fb.var.hsync_len == 0)) {
+                fbi->hsync_time=0;
+                return;
+        }
+
+        htime = (unsigned long long)get_lcdclk_frequency_10khz() * 10000;
+        do_div(htime, pcd * fbi->fb.var.hsync_len);
+        fbi->hsync_time = htime;
+}
+
+unsigned long pxafb_get_hsync_time(struct device *dev)
+{
+        struct pxafb_info *fbi = dev_get_drvdata(dev);
+
+        /* If display is blanked/suspended, hsync isn't active */
+        if (!fbi || (fbi->state != C_ENABLE))
+                return 0;
+
+        return fbi->hsync_time;
+}
+EXPORT_SYMBOL(pxafb_get_hsync_time);
+
+/*
  * pxafb_activate_var():
  *      Configures LCD Controller based on entries in var parameter.  Settings are
  *      only written to the controller if changes were made.
@@ -631,6 +661,7 @@ static int pxafb_activate_var(struct fb_var_screeninfo *var, struct pxafb_info *
         fbi->reg_lccr1 = new_regs.lccr1;
         fbi->reg_lccr2 = new_regs.lccr2;
         fbi->reg_lccr3 = new_regs.lccr3;
+        set_hsync_time(fbi, pcd);
         local_irq_restore(flags);
 
         /*
@@ -907,6 +938,7 @@ pxafb_freq_transition(struct notifier_block *nb, unsigned long val, void *data)
 
         case CPUFREQ_POSTCHANGE:
                 pcd = get_pcd(fbi->fb.var.pixclock);
+                set_hsync_time(fbi, pcd);
                 fbi->reg_lccr3 = (fbi->reg_lccr3 & ~0xff) | LCCR3_PixClkDiv(pcd);
                 set_ctrlr_state(fbi, C_ENABLE_CLKCHANGE);
                 break;