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video: sh_mobile_lcdcfb: Add wait for vsync. 

Added FBIO_WAITFORVSYNC ioctl for SH-Mobile devices.
Tested on MS7724 and MigoR boards against 2.6.33-rc7.

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Phil Edworthy 2010-02-15 13:57:49 +00:00 committed by Paul Mundt
parent 04c8697355
commit 40331b21f5
2 changed files with 49 additions and 1 deletions
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48
drivers/video/sh_mobile_lcdcfb.c
View File

@ -19,6 +19,7 @@
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/vmalloc.h>
#include <linux/ioctl.h>
#include <video/sh_mobile_lcdc.h>
#include <asm/atomic.h>
@ -106,6 +107,7 @@ static unsigned long lcdc_offs_sublcd[NR_CH_REGS] = {
#define LDRCNTR_SRC 0x00010000
#define LDRCNTR_MRS 0x00000002
#define LDRCNTR_MRC 0x00000001
#define LDSR_MRS 0x00000100
struct sh_mobile_lcdc_priv;
struct sh_mobile_lcdc_chan {
@ -124,6 +126,7 @@ struct sh_mobile_lcdc_chan {
unsigned long pan_offset;
unsigned long new_pan_offset;
wait_queue_head_t frame_end_wait;
struct completion vsync_completion;
};
struct sh_mobile_lcdc_priv {
@ -366,7 +369,8 @@ static irqreturn_t sh_mobile_lcdc_irq(int irq, void *data)
}
/* VSYNC End */
if (ldintr & LDINTR_VES) {
if ((ldintr & LDINTR_VES) &&
(ch->pan_offset != ch->new_pan_offset)) {
unsigned long ldrcntr = lcdc_read(priv, _LDRCNTR);
/* Set the source address for the next refresh */
lcdc_write_chan_mirror(ch, LDSA1R, ch->dma_handle +
@ -379,6 +383,9 @@ static irqreturn_t sh_mobile_lcdc_irq(int irq, void *data)
ldrcntr ^ LDRCNTR_MRS);
ch->pan_offset = ch->new_pan_offset;
}
if (ldintr & LDINTR_VES)
complete(&ch->vsync_completion);
}
return IRQ_HANDLED;
@ -786,6 +793,43 @@ static int sh_mobile_fb_pan_display(struct fb_var_screeninfo *var,
return 0;
}
static int sh_mobile_wait_for_vsync(struct fb_info *info)
{
struct sh_mobile_lcdc_chan *ch = info->par;
unsigned long ldintr;
int ret;
/* Enable VSync End interrupt */
ldintr = lcdc_read(ch->lcdc, _LDINTR);
ldintr |= LDINTR_VEE;
lcdc_write(ch->lcdc, _LDINTR, ldintr);
ret = wait_for_completion_interruptible_timeout(&ch->vsync_completion,
msecs_to_jiffies(100));
if (!ret)
return -ETIMEDOUT;
return 0;
}
static int sh_mobile_ioctl(struct fb_info *info, unsigned int cmd,
unsigned long arg)
{
int retval;
switch (cmd) {
case FBIO_WAITFORVSYNC:
retval = sh_mobile_wait_for_vsync(info);
break;
default:
retval = -ENOIOCTLCMD;
break;
}
return retval;
}
static struct fb_ops sh_mobile_lcdc_ops = {
.owner = THIS_MODULE,
.fb_setcolreg = sh_mobile_lcdc_setcolreg,
@ -795,6 +839,7 @@ static struct fb_ops sh_mobile_lcdc_ops = {
.fb_copyarea = sh_mobile_lcdc_copyarea,
.fb_imageblit = sh_mobile_lcdc_imageblit,
.fb_pan_display = sh_mobile_fb_pan_display,
.fb_ioctl = sh_mobile_ioctl,
};
static int sh_mobile_lcdc_set_bpp(struct fb_var_screeninfo *var, int bpp)
@ -962,6 +1007,7 @@ static int __init sh_mobile_lcdc_probe(struct platform_device *pdev)
goto err1;
}
init_waitqueue_head(&priv->ch[i].frame_end_wait);
init_completion(&priv->ch[i].vsync_completion);
priv->ch[j].pan_offset = 0;
priv->ch[j].new_pan_offset = 0;

2
include/video/sh_mobile_lcdc.h
View File

@ -34,6 +34,8 @@ enum { LCDC_CLK_BUS, LCDC_CLK_PERIPHERAL, LCDC_CLK_EXTERNAL };
#define LCDC_FLAGS_HSCNT (1 << 3) /* Disable HSYNC during VBLANK */
#define LCDC_FLAGS_DWCNT (1 << 4) /* Disable dotclock during blanking */
#define FBIO_WAITFORVSYNC _IOW('F', 0x20, __u32)
struct sh_mobile_lcdc_sys_bus_cfg {
unsigned long ldmt2r;
unsigned long ldmt3r;