fbcon: fix color generation for monochrome framebuffer

The current attr_fgcol_ec / attr_bgcol_ec macros do a simple shift of bits
to get the color from vc_video_erase_char.  For a monochrome display
however the attribute does not contain any color, only attribute bits.
Furthermore the reverse bit is lost because it is shifted out, the
resulting color is always 0.

This can bee seen on a monochrome console either directly or by setting it
to inverse mode via "setterm -inversescreen on" .  Text is written with
correct color, fb_fillrects from a bit_clear / bit_clear_margins will get
wrong colors.

Signed-off-by: Thomas Pfaff <tpfaff@pcs.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

7 files changed, 54 insertions, 18 deletions

diff --git a/drivers/video/console/bitblit.c b/drivers/video/console/bitblit.c
index 308850df16fe..69864b1b3f9e 100644
--- a/drivers/video/console/bitblit.c
+++ b/drivers/video/console/bitblit.c
@@ -63,7 +63,7 @@ static void bit_clear(struct vc_data *vc, struct fb_info *info, int sy,
         int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;
         struct fb_fillrect region;
 
-        region.color = attr_bgcol_ec(bgshift, vc);
+        region.color = attr_bgcol_ec(bgshift, vc, info);
         region.dx = sx * vc->vc_font.width;
         region.dy = sy * vc->vc_font.height;
         region.width = width * vc->vc_font.width;
@@ -213,7 +213,7 @@ static void bit_clear_margins(struct vc_data *vc, struct fb_info *info,
         unsigned int bs = info->var.yres - bh;
         struct fb_fillrect region;
 
-        region.color = attr_bgcol_ec(bgshift, vc);
+        region.color = attr_bgcol_ec(bgshift, vc, info);
         region.rop = ROP_COPY;
 
         if (rw && !bottom_only) {
diff --git a/drivers/video/console/fbcon.c b/drivers/video/console/fbcon.c
index c6babb178c77..022282494d3f 100644
--- a/drivers/video/console/fbcon.c
+++ b/drivers/video/console/fbcon.c
@@ -334,10 +334,7 @@ static inline int get_color(struct vc_data *vc, struct fb_info *info,
         switch (depth) {
         case 1:
         {
-                int col = ~(0xfff << (max(info->var.green.length,
-                                          max(info->var.red.length,
-                                              info->var.blue.length)))) & 0xff;
-
+                int col = mono_col(info);
                 /* 0 or 1 */
                 int fg = (info->fix.visual != FB_VISUAL_MONO01) ? col : 0;
                 int bg = (info->fix.visual != FB_VISUAL_MONO01) ? 0 : col;
diff --git a/drivers/video/console/fbcon.h b/drivers/video/console/fbcon.h
index 8e6ef4bc7a5c..3706307e70ed 100644
--- a/drivers/video/console/fbcon.h
+++ b/drivers/video/console/fbcon.h
@@ -93,10 +93,6 @@ struct fbcon_ops {
         (((s) >> (fgshift)) & 0x0f)
 #define attr_bgcol(bgshift,s)    \
         (((s) >> (bgshift)) & 0x0f)
-#define attr_bgcol_ec(bgshift,vc) \
-        ((vc) ? (((vc)->vc_video_erase_char >> (bgshift)) & 0x0f) : 0)
-#define attr_fgcol_ec(fgshift,vc) \
-        ((vc) ? (((vc)->vc_video_erase_char >> (fgshift)) & 0x0f) : 0)
 
 /* Monochrome */
 #define attr_bold(s) \
@@ -108,6 +104,49 @@ struct fbcon_ops {
 #define attr_blink(s) \
         ((s) & 0x8000)
         
+#define mono_col(info)                                                  \
+        (~(0xfff << (max((info)->var.green.length,                      \
+                         max((info)->var.red.length,                    \
+                             (info)->var.blue.length)))) & 0xff)
+
+static inline int attr_col_ec(int shift, struct vc_data *vc,
+                              struct fb_info *info, int is_fg)
+{
+        int is_mono01;
+        int col;
+        int fg;
+        int bg;
+
+        if (!vc)
+                return 0;
+
+        if (vc->vc_can_do_color)
+                return is_fg ? attr_fgcol(shift,vc->vc_video_erase_char)
+                        : attr_bgcol(shift,vc->vc_video_erase_char);
+
+        if (!info)
+                return 0;
+
+        col = mono_col(info);
+        is_mono01 = info->fix.visual == FB_VISUAL_MONO01;
+
+        if (attr_reverse(vc->vc_video_erase_char)) {
+                fg = is_mono01 ? col : 0;
+                bg = is_mono01 ? 0 : col;
+        }
+        else {
+                fg = is_mono01 ? 0 : col;
+                bg = is_mono01 ? col : 0;
+        }
+
+        return is_fg ? fg : bg;
+}
+
+#define attr_bgcol_ec(bgshift,vc,info)          \
+        attr_col_ec(bgshift,vc,info,0);
+#define attr_fgcol_ec(fgshift,vc,info)          \
+        attr_col_ec(fgshift,vc,info,1);
+
 /* Font */
 #define REFCOUNT(fd)    (((int *)(fd))[-1])
 #define FNTSIZE(fd)     (((int *)(fd))[-2])
diff --git a/drivers/video/console/fbcon_ccw.c b/drivers/video/console/fbcon_ccw.c
index 825e6d6972a7..bdf913ecf001 100644
--- a/drivers/video/console/fbcon_ccw.c
+++ b/drivers/video/console/fbcon_ccw.c
@@ -84,7 +84,7 @@ static void ccw_clear(struct vc_data *vc, struct fb_info *info, int sy,
         int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;
         u32 vyres = GETVYRES(ops->p->scrollmode, info);
 
-        region.color = attr_bgcol_ec(bgshift,vc);
+        region.color = attr_bgcol_ec(bgshift,vc,info);
         region.dx = sy * vc->vc_font.height;
         region.dy = vyres - ((sx + width) * vc->vc_font.width);
         region.height = width * vc->vc_font.width;
@@ -198,7 +198,7 @@ static void ccw_clear_margins(struct vc_data *vc, struct fb_info *info,
         struct fb_fillrect region;
         int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;
 
-        region.color = attr_bgcol_ec(bgshift,vc);
+        region.color = attr_bgcol_ec(bgshift,vc,info);
         region.rop = ROP_COPY;
 
         if (rw && !bottom_only) {
diff --git a/drivers/video/console/fbcon_cw.c b/drivers/video/console/fbcon_cw.c
index c637e6318803..a6819b9d1770 100644
--- a/drivers/video/console/fbcon_cw.c
+++ b/drivers/video/console/fbcon_cw.c
@@ -70,7 +70,7 @@ static void cw_clear(struct vc_data *vc, struct fb_info *info, int sy,
         int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;
         u32 vxres = GETVXRES(ops->p->scrollmode, info);
 
-        region.color = attr_bgcol_ec(bgshift,vc);
+        region.color = attr_bgcol_ec(bgshift,vc,info);
         region.dx = vxres - ((sy + height) * vc->vc_font.height);
         region.dy = sx *  vc->vc_font.width;
         region.height = width * vc->vc_font.width;
@@ -182,7 +182,7 @@ static void cw_clear_margins(struct vc_data *vc, struct fb_info *info,
         struct fb_fillrect region;
         int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;
 
-        region.color = attr_bgcol_ec(bgshift,vc);
+        region.color = attr_bgcol_ec(bgshift,vc,info);
         region.rop = ROP_COPY;
 
         if (rw && !bottom_only) {
diff --git a/drivers/video/console/fbcon_ud.c b/drivers/video/console/fbcon_ud.c
index 1473506df5d0..d9b5d6eb68a7 100644
--- a/drivers/video/console/fbcon_ud.c
+++ b/drivers/video/console/fbcon_ud.c
@@ -71,7 +71,7 @@ static void ud_clear(struct vc_data *vc, struct fb_info *info, int sy,
         u32 vyres = GETVYRES(ops->p->scrollmode, info);
         u32 vxres = GETVXRES(ops->p->scrollmode, info);
 
-        region.color = attr_bgcol_ec(bgshift,vc);
+        region.color = attr_bgcol_ec(bgshift,vc,info);
         region.dy = vyres - ((sy + height) * vc->vc_font.height);
         region.dx = vxres - ((sx + width) *  vc->vc_font.width);
         region.width = width * vc->vc_font.width;
@@ -228,7 +228,7 @@ static void ud_clear_margins(struct vc_data *vc, struct fb_info *info,
         struct fb_fillrect region;
         int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;
 
-        region.color = attr_bgcol_ec(bgshift,vc);
+        region.color = attr_bgcol_ec(bgshift,vc,info);
         region.rop = ROP_COPY;
 
         if (rw && !bottom_only) {
diff --git a/drivers/video/console/tileblit.c b/drivers/video/console/tileblit.c
index d981fe4d86c6..0056a41e5c35 100644
--- a/drivers/video/console/tileblit.c
+++ b/drivers/video/console/tileblit.c
@@ -40,8 +40,8 @@ static void tile_clear(struct vc_data *vc, struct fb_info *info, int sy,
 
         rect.index = vc->vc_video_erase_char &
                 ((vc->vc_hi_font_mask) ? 0x1ff : 0xff);
-        rect.fg = attr_fgcol_ec(fgshift, vc);
-        rect.bg = attr_bgcol_ec(bgshift, vc);
+        rect.fg = attr_fgcol_ec(fgshift, vc, info);
+        rect.bg = attr_bgcol_ec(bgshift, vc, info);
         rect.sx = sx;
         rect.sy = sy;
         rect.width = width;