diff options
Diffstat (limited to 'drivers/video/s3c-fb.c')
| -rw-r--r-- | drivers/video/s3c-fb.c | 40 |
1 files changed, 36 insertions, 4 deletions
diff --git a/drivers/video/s3c-fb.c b/drivers/video/s3c-fb.c index 6cbddc445f03..f76791180dbe 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, 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], |