S5PV210 allows per-window locking of register value updates from shadow
registers.
Signed-off-by: Pawel Osciak <p.osc...@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.p...@samsung.com>
---
arch/arm/plat-samsung/include/plat/regs-fb.h | 3 ++
drivers/video/s3c-fb.c | 39 +++++++++++++++++++++++--
2 files changed, 38 insertions(+), 4 deletions(-)
diff --git a/arch/arm/plat-samsung/include/plat/regs-fb.h
b/arch/arm/plat-samsung/include/plat/regs-fb.h
index 5bcdd09..da54b64 100644
--- a/arch/arm/plat-samsung/include/plat/regs-fb.h
+++ b/arch/arm/plat-samsung/include/plat/regs-fb.h
@@ -218,6 +218,9 @@
#define WINCON1_BPPMODE_25BPP_A1888 (0xd << 2)
#define WINCON1_BPPMODE_28BPP_A4888 (0xd << 2)
+/* S5PV210 */
+#define SHADOWCON (0x34)
+#define SHADOWCON_WINx_PROTECT(_win) (1 << (10 + _win))
#define VIDOSDxA_TOPLEFT_X_MASK (0x7ff << 11)
#define VIDOSDxA_TOPLEFT_X_SHIFT (11)
diff --git a/drivers/video/s3c-fb.c b/drivers/video/s3c-fb.c
index 0a93fca..94423c5 100644
--- a/drivers/video/s3c-fb.c
+++ b/drivers/video/s3c-fb.c
@@ -79,6 +79,7 @@ struct s3c_fb;
* @osd: The base for the OSD registers.
* @palette: Address of palette memory, or 0 if none.
* @has_prtcon: Set if has PRTCON register.
+ * @has_shadowcon: Set if has SHADOWCON register.
*/
struct s3c_fb_variant {
unsigned int is_2443:1;
@@ -95,6 +96,7 @@ struct s3c_fb_variant {
unsigned short palette[S3C_FB_MAX_WIN];
unsigned int has_prtcon:1;
+ unsigned int has_shadowcon:1;
};
/**
@@ -363,6 +365,36 @@ static int s3c_fb_align_word(unsigned int bpp, unsigned
int pix)
}
/**
+ * shadow_protect_win() - disable updating values from shadow registers at
vsync
+ *
+ * @win: window to protect registers for
+ * @protect: 1 to protect (disable updates)
+ */
+static void shadow_protect_win(struct s3c_fb_win *win, int protect)
+{
+ struct s3c_fb *sfb = win->parent;
+ u32 reg;
+
+ if (protect) {
+ if (sfb->variant.has_prtcon) {
+ writel(PRTCON_PROTECT, sfb->regs + PRTCON);
+ } else if (sfb->variant.has_shadowcon) {
+ reg = readl(sfb->regs + SHADOWCON);
+ writel(reg | SHADOWCON_WINx_PROTECT(win->index),
+ sfb->regs + SHADOWCON);
+ }
+ } else {
+ if (sfb->variant.has_prtcon) {
+ writel(0, sfb->regs + PRTCON);
+ } else if (sfb->variant.has_shadowcon) {
+ reg = readl(sfb->regs + SHADOWCON);
+ writel(reg & ~SHADOWCON_WINx_PROTECT(win->index),
+ sfb->regs + SHADOWCON);
+ }
+ }
+}
+
+/**
* s3c_fb_set_par() - framebuffer request to set new framebuffer state.
* @info: The framebuffer to change.
*
@@ -811,16 +843,14 @@ static int s3c_fb_pan_display(struct fb_var_screeninfo
*var,
/* 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);
+ shadow_protect_win(win, 1);
writel(info->fix.smem_start + start_byte_offset,
buf + sfb->variant.buf_start);
writel(info->fix.smem_start + end_byte_offset,
buf + sfb->variant.buf_end);
- if (sfb->variant.has_prtcon)
- writel(0, sfb->regs + PRTCON);
+ shadow_protect_win(win, 0);
return 0;
}
@@ -1534,6 +1564,7 @@ static struct s3c_fb_driverdata s3c_fb_data_s5pv210
__devinitdata = {
[4] = 0x3400,
},
+ .has_shadowcon = 1,
},
.win[0] = &s3c_fb_data_64xx_wins[0],
.win[1] = &s3c_fb_data_64xx_wins[1],
--
1.7.1.569.g6f426
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