[patch] pxafb: Add hsync time reporting hook
DORMANTno replies
From: Richard Purdie <hidden>
Date: 2005-08-31 11:33:47
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 <redacted> Index: linux-2.6.12/drivers/video/pxafb.c ===================================================================
--- linux-2.6.12.orig/drivers/video/pxafb.c 2005-08-25 11:46:09.000000000 +0100
+++ linux-2.6.12/drivers/video/pxafb.c 2005-08-25 11:59:22.000000000 +0100@@ -468,6 +468,36 @@ } /* + * 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 @@ 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); /*
@@ -901,6 +932,7 @@ 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;
Index: linux-2.6.12/include/asm-arm/arch-pxa/pxafb.h ===================================================================
--- linux-2.6.12.orig/include/asm-arm/arch-pxa/pxafb.h 2005-08-25 11:45:49.000000000 +0100
+++ linux-2.6.12/include/asm-arm/arch-pxa/pxafb.h 2005-08-25 11:46:41.000000000 +0100@@ -66,3 +66,4 @@ }; void set_pxa_fb_info(struct pxafb_mach_info *hard_pxa_fb_info); +unsigned long pxafb_get_hsync_time(struct device *dev);
Index: linux-2.6.12/drivers/video/pxafb.h ===================================================================
--- linux-2.6.12.orig/drivers/video/pxafb.h 2005-06-17 20:48:29.000000000 +0100
+++ linux-2.6.12/drivers/video/pxafb.h 2005-08-25 11:51:03.000000000 +0100@@ -83,6 +83,8 @@ 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; -------------------------------------------------------
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