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[PATCH] pxafb: Add hsync time reporting hook

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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>
This commit is contained in:
Richard Purdie 2005-09-09 13:10:03 -07:00 committed by Linus Torvalds
parent 61ab7903b8
commit ba44cd2d8a
3 changed files with 35 additions and 0 deletions
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32
drivers/video/pxafb.c
View file

@ -467,6 +467,36 @@ static inline unsigned int get_pcd(unsigned int pixclock)
return (unsigned int)pcd;
}
/*
* 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
@ -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;

2
drivers/video/pxafb.h
View file

@ -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;

1
include/asm-arm/arch-pxa/pxafb.h
View file

@ -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);