fbdev: atafb - Fix line length handling

  - Make sure par->next_line is always set (this was done for Falcon only),
    as all the text console drawing operations need a valid par->next_line,
  - Make sure fix->line_length is always set, as some userspace applications
    need it because they don't have fallback code for the case where it's zero.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

1 files changed, 8 insertions, 4 deletions

diff --git a/drivers/video/atafb.c b/drivers/video/atafb.c
index 77eb8b34fbfa..b7646ad71bb3 100644
--- a/drivers/video/atafb.c
+++ b/drivers/video/atafb.c
@@ -614,7 +614,7 @@ static int tt_encode_fix(struct fb_fix_screeninfo *fix, struct atafb_par *par)
         fix->xpanstep = 0;
         fix->ypanstep = 1;
         fix->ywrapstep = 0;
-        fix->line_length = 0;
+        fix->line_length = par->next_line;
         fix->accel = FB_ACCEL_ATARIBLITT;
         return 0;
 }
@@ -691,6 +691,7 @@ static int tt_decode_var(struct fb_var_screeninfo *var, struct atafb_par *par)
                 return -EINVAL;
         par->yres_virtual = yres_virtual;
         par->screen_base = screen_base + var->yoffset * linelen;
+        par->next_line = linelen;
         return 0;
 }
 
@@ -918,7 +919,7 @@ static int falcon_encode_fix(struct fb_fix_screeninfo *fix,
                 fix->visual = FB_VISUAL_TRUECOLOR;
                 fix->xpanstep = 2;
         }
-        fix->line_length = 0;
+        fix->line_length = par->next_line;
         fix->accel = FB_ACCEL_ATARIBLITT;
         return 0;
 }
@@ -1852,7 +1853,7 @@ static int stste_encode_fix(struct fb_fix_screeninfo *fix,
                 fix->ypanstep = 0;
         }
         fix->ywrapstep = 0;
-        fix->line_length = 0;
+        fix->line_length = par->next_line;
         fix->accel = FB_ACCEL_ATARIBLITT;
         return 0;
 }
@@ -1910,6 +1911,7 @@ static int stste_decode_var(struct fb_var_screeninfo *var,
                 return -EINVAL;
         par->yres_virtual = yres_virtual;
         par->screen_base = screen_base + var->yoffset * linelen;
+        par->next_line = linelen;
         return 0;
 }
 
@@ -2169,7 +2171,7 @@ static int ext_encode_fix(struct fb_fix_screeninfo *fix, struct atafb_par *par)
         fix->xpanstep = 0;
         fix->ypanstep = 0;
         fix->ywrapstep = 0;
-        fix->line_length = 0;
+        fix->line_length = par->next_line;
         return 0;
 }
 
@@ -2184,6 +2186,8 @@ static int ext_decode_var(struct fb_var_screeninfo *var, struct atafb_par *par)
             var->xoffset > 0 ||
             var->yoffset > 0)
                 return -EINVAL;
+
+        par->next_line = external_xres_virtual * external_depth / 8;
         return 0;
 }