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[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>
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3 changed files with 35 additions and 0 deletions
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@ -467,6 +467,36 @@ static inline unsigned int get_pcd(unsigned int pixclock)
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return (unsigned int)pcd;
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}
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/*
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* Some touchscreens need hsync information from the video driver to
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* function correctly. We export it here.
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*/
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static inline void set_hsync_time(struct pxafb_info *fbi, unsigned int pcd)
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{
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unsigned long long htime;
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if ((pcd == 0) || (fbi->fb.var.hsync_len == 0)) {
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fbi->hsync_time=0;
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return;
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}
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htime = (unsigned long long)get_lcdclk_frequency_10khz() * 10000;
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do_div(htime, pcd * fbi->fb.var.hsync_len);
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fbi->hsync_time = htime;
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}
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unsigned long pxafb_get_hsync_time(struct device *dev)
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{
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struct pxafb_info *fbi = dev_get_drvdata(dev);
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/* If display is blanked/suspended, hsync isn't active */
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if (!fbi || (fbi->state != C_ENABLE))
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return 0;
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return fbi->hsync_time;
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}
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EXPORT_SYMBOL(pxafb_get_hsync_time);
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/*
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* pxafb_activate_var():
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* Configures LCD Controller based on entries in var parameter. Settings are
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@ -631,6 +661,7 @@ static int pxafb_activate_var(struct fb_var_screeninfo *var, struct pxafb_info *
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fbi->reg_lccr1 = new_regs.lccr1;
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fbi->reg_lccr2 = new_regs.lccr2;
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fbi->reg_lccr3 = new_regs.lccr3;
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set_hsync_time(fbi, pcd);
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local_irq_restore(flags);
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/*
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@ -907,6 +938,7 @@ pxafb_freq_transition(struct notifier_block *nb, unsigned long val, void *data)
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case CPUFREQ_POSTCHANGE:
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pcd = get_pcd(fbi->fb.var.pixclock);
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set_hsync_time(fbi, pcd);
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fbi->reg_lccr3 = (fbi->reg_lccr3 & ~0xff) | LCCR3_PixClkDiv(pcd);
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set_ctrlr_state(fbi, C_ENABLE_CLKCHANGE);
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break;
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@ -83,6 +83,8 @@ struct pxafb_info {
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u_int reg_lccr2;
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u_int reg_lccr3;
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unsigned long hsync_time;
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volatile u_char state;
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volatile u_char task_state;
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struct semaphore ctrlr_sem;
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@ -66,3 +66,4 @@ struct pxafb_mach_info {
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};
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void set_pxa_fb_info(struct pxafb_mach_info *hard_pxa_fb_info);
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unsigned long pxafb_get_hsync_time(struct device *dev);
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