projects/linux·commit ba44cd2d

[PATCH] pxafb: Add hsync time reporting hook

ba44cd2d · Richard Purdie <[email protected]> · 2005-09-09 13:10:03 -07:00

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 <[email protected]>
Signed-off-by: Antonino Daplas <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Commit
ba44cd2d8abc3271a608b42cdbf55e1e575e2ba5
Parents
61ab7903

Changes

3 files changed · +35 −0

FileStatusAddDelContent
drivers/video/pxafb.cmodified+32−0View file
drivers/video/pxafb.hmodified+2−0View file
include/asm-arm/arch-pxa/pxafb.hmodified+1−0View file

drivers/video/pxafb.c

View file
diff --git a/drivers/video/pxafb.c b/drivers/video/pxafb.c
index 3011281..34d4dcc 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;

drivers/video/pxafb.h

View file
diff --git a/drivers/video/pxafb.h b/drivers/video/pxafb.h
index de15fec..22c00be 100644
--- a/drivers/video/pxafb.h
+++ b/drivers/video/pxafb.h
@@ -83,6 +83,8 @@ struct pxafb_info {
u_int reg_lccr2;
u_int reg_lccr3;
+ unsigned long hsync_time;
+
volatile u_char state;
volatile u_char task_state;
struct semaphore ctrlr_sem;

include/asm-arm/arch-pxa/pxafb.h

View file
diff --git a/include/asm-arm/arch-pxa/pxafb.h b/include/asm-arm/arch-pxa/pxafb.h
index 27d71e9..21c0e16 100644
--- a/include/asm-arm/arch-pxa/pxafb.h
+++ b/include/asm-arm/arch-pxa/pxafb.h
@@ -66,3 +66,4 @@ struct pxafb_mach_info {
};
void set_pxa_fb_info(struct pxafb_mach_info *hard_pxa_fb_info);
+unsigned long pxafb_get_hsync_time(struct device *dev);