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authorFinn Thain <fthain@telegraphics.com.au>2009-11-04 00:43:16 +1100
committerGeert Uytterhoeven <geert@linux-m68k.org>2010-02-27 18:31:12 +0100
commitd876c11a0fd40993136f5cc1e81371ccc6c21a63 (patch)
treed2f09796146f4d8a61499759191e4cb832b1984c
parenteeb9c182a6ad8bc130377adb0a4cd7b95dd15f49 (diff)
fbdev: mac_var_to_mode() fix
The valkyriefb driver assumes that this logic holds: mac_vmode_to_var(X, cmode, &var); mac_var_to_vmode(&var, &vmode, &cmode); assert(vmode == X); But it doesn't hold because mac_var_to_vmode() can return a mode with a slower pixel clock, even when a match is available. So we end up with this failure: using video mode 11 and color mode 0. valkyriefb: vmode 12 not valid. valkyriefb: can't set default video mode valkyriefb: vmode 12 not valid. Rather than have mac_var_to_mode() return the first reasonable mode it finds, have it return the mode that is closest to the requested one (or the mode with the closest longer pixel clock period if there is no exact match). Signed-off-by: Finn Thain <fthain@telegraphics.com.au> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
-rw-r--r--drivers/video/macmodes.c40
1 files changed, 31 insertions, 9 deletions
diff --git a/drivers/video/macmodes.c b/drivers/video/macmodes.c
index 083f60321ed..3e11f7425ae 100644
--- a/drivers/video/macmodes.c
+++ b/drivers/video/macmodes.c
@@ -134,7 +134,7 @@ static const struct fb_videomode mac_modedb[] = {
*
* These MUST be ordered in
* - increasing resolution
- * - decreasing refresh rate
+ * - decreasing pixel clock period
*/
static const struct mode_map {
@@ -142,20 +142,20 @@ static const struct mode_map {
const struct fb_videomode *mode;
} mac_modes[] = {
/* 640x480 */
- { VMODE_640_480_67, &mac_modedb[1] },
{ VMODE_640_480_60, &mac_modedb[0] },
+ { VMODE_640_480_67, &mac_modedb[1] },
/* 800x600 */
+ { VMODE_800_600_56, &mac_modedb[2] },
+ { VMODE_800_600_60, &mac_modedb[3] },
{ VMODE_800_600_75, &mac_modedb[5] },
{ VMODE_800_600_72, &mac_modedb[4] },
- { VMODE_800_600_60, &mac_modedb[3] },
- { VMODE_800_600_56, &mac_modedb[2] },
/* 832x624 */
{ VMODE_832_624_75, &mac_modedb[6] },
/* 1024x768 */
- { VMODE_1024_768_75, &mac_modedb[10] },
- { VMODE_1024_768_75V, &mac_modedb[9] },
- { VMODE_1024_768_70, &mac_modedb[8] },
{ VMODE_1024_768_60, &mac_modedb[7] },
+ { VMODE_1024_768_70, &mac_modedb[8] },
+ { VMODE_1024_768_75V, &mac_modedb[9] },
+ { VMODE_1024_768_75, &mac_modedb[10] },
/* 1152x768 */
{ VMODE_1152_768_60, &mac_modedb[14] },
/* 1152x870 */
@@ -299,7 +299,6 @@ EXPORT_SYMBOL(mac_vmode_to_var);
int mac_var_to_vmode(const struct fb_var_screeninfo *var, int *vmode,
int *cmode)
{
- const struct fb_videomode *mode = NULL;
const struct mode_map *map;
if (var->bits_per_pixel <= 8)
@@ -311,8 +310,13 @@ int mac_var_to_vmode(const struct fb_var_screeninfo *var, int *vmode,
else
return -EINVAL;
+ /*
+ * Find the mac_mode with a matching resolution or failing that, the
+ * closest larger resolution. Skip modes with a shorter pixel clock period.
+ */
for (map = mac_modes; map->vmode != -1; map++) {
- mode = map->mode;
+ const struct fb_videomode *mode = map->mode;
+
if (var->xres > mode->xres || var->yres > mode->yres)
continue;
if (var->xres_virtual > mode->xres || var->yres_virtual > mode->yres)
@@ -322,6 +326,24 @@ int mac_var_to_vmode(const struct fb_var_screeninfo *var, int *vmode,
if ((var->vmode & FB_VMODE_MASK) != mode->vmode)
continue;
*vmode = map->vmode;
+
+ /*
+ * Having found a good resolution, find the matching pixel clock
+ * or failing that, the closest longer pixel clock period.
+ */
+ map++;
+ while (map->vmode != -1) {
+ const struct fb_videomode *clk_mode = map->mode;
+
+ if (mode->xres != clk_mode->xres || mode->yres != clk_mode->yres)
+ break;
+ if (var->pixclock > mode->pixclock)
+ break;
+ if (mode->vmode != clk_mode->vmode)
+ continue;
+ *vmode = map->vmode;
+ map++;
+ }
return 0;
}
return -EINVAL;