diff options
Diffstat (limited to 'drivers/video/s3c-fb.c')
| -rw-r--r-- | drivers/video/s3c-fb.c | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/drivers/video/s3c-fb.c b/drivers/video/s3c-fb.c index 5f931b4933bd..de427d928f48 100644 --- a/drivers/video/s3c-fb.c +++ b/drivers/video/s3c-fb.c @@ -71,6 +71,7 @@ struct s3c_fb; * @buf_end: Offset of buffer end registers. * @osd: The base for the OSD registers. * @palette: Address of palette memory, or 0 if none. + * @has_prtcon: Set if has PRTCON register. */ struct s3c_fb_variant { unsigned int is_2443:1; @@ -85,6 +86,8 @@ struct s3c_fb_variant { unsigned short osd; unsigned short osd_stride; unsigned short palette[S3C_FB_MAX_WIN]; + + unsigned int has_prtcon:1; }; /** @@ -379,6 +382,9 @@ static int s3c_fb_set_par(struct fb_info *info) info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8; + info->fix.xpanstep = info->var.xres_virtual > info->var.xres ? 1 : 0; + info->fix.ypanstep = info->var.yres_virtual > info->var.yres ? 1 : 0; + /* disable the window whilst we update it */ writel(0, regs + WINCON(win_no)); @@ -735,6 +741,63 @@ static int s3c_fb_blank(int blank_mode, struct fb_info *info) return 0; } +/** + * s3c_fb_pan_display() - Pan the display. + * + * Note that the offsets can be written to the device at any time, as their + * values are latched at each vsync automatically. This also means that only + * the last call to this function will have any effect on next vsync, but + * there is no need to sleep waiting for it to prevent tearing. + * + * @var: The screen information to verify. + * @info: The framebuffer device. + */ +static int s3c_fb_pan_display(struct fb_var_screeninfo *var, + struct fb_info *info) +{ + struct s3c_fb_win *win = info->par; + struct s3c_fb *sfb = win->parent; + void __iomem *buf = sfb->regs + win->index * 8; + unsigned int start_boff, end_boff; + + /* Offset in bytes to the start of the displayed area */ + start_boff = var->yoffset * info->fix.line_length; + /* X offset depends on the current bpp */ + if (info->var.bits_per_pixel >= 8) { + start_boff += var->xoffset * (info->var.bits_per_pixel >> 3); + } else { + switch (info->var.bits_per_pixel) { + case 4: + start_boff += var->xoffset >> 1; + break; + case 2: + start_boff += var->xoffset >> 2; + break; + case 1: + start_boff += var->xoffset >> 3; + break; + default: + dev_err(sfb->dev, "invalid bpp\n"); + return -EINVAL; + } + } + /* Offset in bytes to the end of the displayed area */ + end_boff = start_boff + var->yres * info->fix.line_length; + + /* Temporarily turn off per-vsync update from shadow registers until + * both start and end addresses are updated to prevent corruption */ + if (sfb->variant.has_prtcon) + writel(PRTCON_PROTECT, sfb->regs + PRTCON); + + writel(info->fix.smem_start + start_boff, buf + sfb->variant.buf_start); + writel(info->fix.smem_start + end_boff, buf + sfb->variant.buf_end); + + if (sfb->variant.has_prtcon) + writel(0, sfb->regs + PRTCON); + + return 0; +} + static struct fb_ops s3c_fb_ops = { .owner = THIS_MODULE, .fb_check_var = s3c_fb_check_var, @@ -744,6 +807,7 @@ static struct fb_ops s3c_fb_ops = { .fb_fillrect = cfb_fillrect, .fb_copyarea = cfb_copyarea, .fb_imageblit = cfb_imageblit, + .fb_pan_display = s3c_fb_pan_display, }; /** @@ -1243,6 +1307,8 @@ static struct s3c_fb_driverdata s3c_fb_data_64xx __devinitdata = { [3] = 0x320, [4] = 0x340, }, + + .has_prtcon = 1, }, .win[0] = &s3c_fb_data_64xx_wins[0], .win[1] = &s3c_fb_data_64xx_wins[1], @@ -1271,6 +1337,8 @@ static struct s3c_fb_driverdata s3c_fb_data_s5pc100 __devinitdata = { [3] = 0x3000, [4] = 0x3400, }, + + .has_prtcon = 1, }, .win[0] = &s3c_fb_data_64xx_wins[0], .win[1] = &s3c_fb_data_64xx_wins[1], |