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s3c-fb: add SHADOWCON shadow register locking support for S5PV210

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S5PV210 allows per-window locking of register value updates from shadow
registers.

Signed-off-by: Pawel Osciak <[email protected]>
Signed-off-by: Kyungmin Park <[email protected]>
Cc: InKi Dae <[email protected]>
Cc: Ben Dooks <[email protected]>
Cc: Marek Szyprowski <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Pawel Osciak 2010-08-10 18:02:40 -07:00 • committed by Linus Torvalds
commit f5ec546f1f
2 changed files with 39 additions and 4 deletions
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40
drivers/video/s3c-fb.c
View file

@ -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;
};
/**
@ -362,6 +364,36 @@ static int s3c_fb_align_word(unsigned int bpp, unsigned int pix)
return ALIGN(pix, pix_per_word);
}
/**
* 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, bool 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.
@ -810,14 +842,12 @@ 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_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);
shadow_protect_win(win, 0);
return 0;
}
@ -1530,6 +1560,8 @@ static struct s3c_fb_driverdata s3c_fb_data_s5pv210 __devinitdata = {
[3] = 0x3000,
[4] = 0x3400,
},
.has_shadowcon = 1,
},
.win[0] = &s3c_fb_data_64xx_wins[0],
.win[1] = &s3c_fb_data_64xx_wins[1],