fbset can pass var->bits_per_pixel = 15 when doing fbset -depth 15,
so we need to "correct" that to bpp 16 / depth 15.
Additionally, we make it possible to pass 15 as an argument to
drm_fb_helper_single_fb_probe() which will similarily select
a bpp of 15 and a depth of 15.
Signed-off-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_fb_helper.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index f546d1e..da6873c 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -571,6 +571,14 @@ int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
}
switch (var->bits_per_pixel) {
+ case 15:
+ /*
+ * There is no such thing as a packed 15bpp,
+ * so in this case, assume 16bpp, depth 15
+ */
+ depth = 15;
+ var->bits_per_pixel = 16;
+ break;
case 16:
depth = (var->green.length == 6) ? 16 : 15;
break;
@@ -722,10 +730,15 @@ int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
sizes.fb_width = (unsigned)-1;
sizes.fb_height = (unsigned)-1;
- /* if driver picks 8 or 16 by default use that
- for both depth/bpp */
+ /*
+ * If driver picks 8 or 16 by default use that
+ * for both depth/bpp, however convert 15 to bpp 16
+ * depth 15
+ */
if (preferred_bpp != sizes.surface_bpp) {
sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
+ if (preferred_bpp == 15)
+ sizes.surface_bpp = 16;
}
/* first up get a count of crtcs now in use and new min/maxes width/heights */
for (i = 0; i < fb_helper->connector_count; i++) {
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