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-rw-r--r--arch/arm/plat-samsung/include/plat/regs-fb.h7
-rw-r--r--drivers/video/s3c-fb.c68
2 files changed, 75 insertions, 0 deletions
diff --git a/arch/arm/plat-samsung/include/plat/regs-fb.h b/arch/arm/plat-samsung/include/plat/regs-fb.h
index ac10013959b..dbb6c0afef4 100644
--- a/arch/arm/plat-samsung/include/plat/regs-fb.h
+++ b/arch/arm/plat-samsung/include/plat/regs-fb.h
@@ -112,6 +112,13 @@
#define VIDCON2_ORGYCbCr (1 << 8)
#define VIDCON2_YUVORDCrCb (1 << 7)
+/* PRTCON (S3C6410, S5PC100)
+ * Might not be present in the S3C6410 documentation,
+ * but tests prove it's there almost for sure; shouldn't hurt in any case.
+ */
+#define PRTCON (0x0c)
+#define PRTCON_PROTECT (1 << 11)
+
/* VIDTCON0 */
#define VIDTCON0_VBPDE_MASK (0xff << 24)
diff --git a/drivers/video/s3c-fb.c b/drivers/video/s3c-fb.c
index 5f931b4933b..de427d928f4 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],