video: s3c-fb: Hold runtime PM references when touching registers

Take a runtime PM reference whenever updating registers in preparation
for suspending the device when the framebuffer is blanked.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

diff --git a/drivers/video/s3c-fb.c b/drivers/video/s3c-fb.c
index 688b9d8..84cf631 100644 (file)
--- a/drivers/video/s3c-fb.c
+++ b/drivers/video/s3c-fb.c
@@ -496,6 +496,8 @@ static int s3c_fb_set_par(struct fb_info *info)
 
        dev_dbg(sfb->dev, "setting framebuffer parameters\n");
 
+       pm_runtime_get_sync(sfb->dev);
+
        shadow_protect_win(win, 1);
 
        switch (var->bits_per_pixel) {
@@ -692,6 +694,8 @@ static int s3c_fb_set_par(struct fb_info *info)
 
        shadow_protect_win(win, 0);
 
+       pm_runtime_put_sync(sfb->dev);
+
        return 0;
 }
 
@@ -763,6 +767,8 @@ static int s3c_fb_setcolreg(unsigned regno,
        dev_dbg(sfb->dev, "%s: win %d: %d => rgb=%d/%d/%d\n",
                __func__, win->index, regno, red, green, blue);
 
+       pm_runtime_get_sync(sfb->dev);
+
        switch (info->fix.visual) {
        case FB_VISUAL_TRUECOLOR:
                /* true-colour, use pseudo-palette */
@@ -790,9 +796,11 @@ static int s3c_fb_setcolreg(unsigned regno,
                break;
 
        default:
+               pm_runtime_put_sync(sfb->dev);
                return 1;       /* unknown type */
        }
 
+       pm_runtime_put_sync(sfb->dev);
        return 0;
 }
 
@@ -812,6 +820,8 @@ static int s3c_fb_blank(int blank_mode, struct fb_info *info)
 
        dev_dbg(sfb->dev, "blank mode %d\n", blank_mode);
 
+       pm_runtime_get_sync(sfb->dev);
+
        wincon = readl(sfb->regs + sfb->variant.wincon + (index * 4));
 
        switch (blank_mode) {
@@ -839,6 +849,7 @@ static int s3c_fb_blank(int blank_mode, struct fb_info *info)
        case FB_BLANK_VSYNC_SUSPEND:
        case FB_BLANK_HSYNC_SUSPEND:
        default:
+               pm_runtime_put_sync(sfb->dev);
                return 1;
        }
 
@@ -869,6 +880,8 @@ static int s3c_fb_blank(int blank_mode, struct fb_info *info)
                shadow_protect_win(win, 0);
        }
 
+       pm_runtime_put_sync(sfb->dev);
+
        return 0;
 }
 
@@ -891,6 +904,8 @@ static int s3c_fb_pan_display(struct fb_var_screeninfo *var,
        void __iomem *buf       = sfb->regs + win->index * 8;
        unsigned int start_boff, end_boff;
 
+       pm_runtime_get_sync(sfb->dev);
+
        /* 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 */
@@ -909,6 +924,7 @@ static int s3c_fb_pan_display(struct fb_var_screeninfo *var,
                        break;
                default:
                        dev_err(sfb->dev, "invalid bpp\n");
+                       pm_runtime_put_sync(sfb->dev);
                        return -EINVAL;
                }
        }
@@ -924,6 +940,7 @@ static int s3c_fb_pan_display(struct fb_var_screeninfo *var,
 
        shadow_protect_win(win, 0);
 
+       pm_runtime_put_sync(sfb->dev);
        return 0;
 }
 
@@ -1013,11 +1030,16 @@ static int s3c_fb_wait_for_vsync(struct s3c_fb *sfb, u32 crtc)
        if (crtc != 0)
                return -ENODEV;
 
+       pm_runtime_get_sync(sfb->dev);
+
        count = sfb->vsync_info.count;
        s3c_fb_enable_irq(sfb);
        ret = wait_event_interruptible_timeout(sfb->vsync_info.wait,
                                       count != sfb->vsync_info.count,
                                       msecs_to_jiffies(VSYNC_TIMEOUT_MSEC));
+
+       pm_runtime_put_sync(sfb->dev);
+
        if (ret == 0)
                return -ETIMEDOUT;