fbdev: Implement simple blanking in pseudocolor modes for vt8500lcdfb

Implement simple blanking in pseudocolor modes for vt8500lcdfb

This follows the style of some other in-tree drivers by just setting
the hardware palette colors to all black. True Color modes are not
affected, but this at least allows to run xf86-video-fbdev without
errors due to blanking being unimplemented.

Signed-off-by: Alexey Charkov <alchark@gmail.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/video/vt8500lcdfb.c b/drivers/video/vt8500lcdfb.c
index 7617f12e4fd7..0e120d67eb65 100644
--- a/drivers/video/vt8500lcdfb.c
+++ b/drivers/video/vt8500lcdfb.c
@@ -215,6 +215,33 @@ static int vt8500lcd_pan_display(struct fb_var_screeninfo *var,
         return 0;
 }
 
+/*
+ * vt8500lcd_blank():
+ *      Blank the display by setting all palette values to zero.  Note,
+ *      True Color modes do not really use the palette, so this will not
+ *      blank the display in all modes.
+ */
+static int vt8500lcd_blank(int blank, struct fb_info *info)
+{
+        int i;
+
+        switch (blank) {
+        case FB_BLANK_POWERDOWN:
+        case FB_BLANK_VSYNC_SUSPEND:
+        case FB_BLANK_HSYNC_SUSPEND:
+        case FB_BLANK_NORMAL:
+                if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR ||
+                    info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
+                        for (i = 0; i < 256; i++)
+                                vt8500lcd_setcolreg(i, 0, 0, 0, 0, info);
+        case FB_BLANK_UNBLANK:
+                if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR ||
+                    info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
+                        fb_set_cmap(&info->cmap, info);
+        }
+        return 0;
+}
+
 static struct fb_ops vt8500lcd_ops = {
         .owner          = THIS_MODULE,
         .fb_set_par     = vt8500lcd_set_par,
@@ -225,6 +252,7 @@ static struct fb_ops vt8500lcd_ops = {
         .fb_sync        = wmt_ge_sync,
         .fb_ioctl       = vt8500lcd_ioctl,
         .fb_pan_display = vt8500lcd_pan_display,
+        .fb_blank       = vt8500lcd_blank,
 };
 
 static irqreturn_t vt8500lcd_handle_irq(int irq, void *dev_id)