[PATCH 7/10] pxafb: Add hsync time reporting hook
DORMANTno replies
From: "Antonino A. Daplas" <adaplas@gmail.com>
Date: 2005-09-01 21:56:18
Subsystem:
framebuffer layer, the rest · Maintainers:
Helge Deller, Linus Torvalds
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.
From: Richard Purdie [off-list ref]
Signed-Off-By: Richard Purdie [off-list ref]
Signed-off-by: Antonino Daplas [off-list ref]
---
drivers/video/pxafb.c | 32 ++++++++++++++++++++++++++++++++
drivers/video/pxafb.h | 2 ++
include/asm-arm/arch-pxa/pxafb.h | 1 +
3 files changed, 35 insertions(+)
diff --git a/drivers/video/pxafb.c b/drivers/video/pxafb.c
--- a/drivers/video/pxafb.c
+++ b/drivers/video/pxafb.c@@ -468,6 +468,36 @@ static inline unsigned int get_pcd(unsig } /* + * 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_ 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_bl 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;
diff --git a/drivers/video/pxafb.h b/drivers/video/pxafb.h
--- 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;
diff --git a/include/asm-arm/arch-pxa/pxafb.h b/include/asm-arm/arch-pxa/pxafb.h
--- 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); -------------------------------------------------------
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