drm/mgag200: on cards with < 2MB VRAM default to 16-bit
This aligns with what the userspace -mga driver does in
the same situation.
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/mgag200/mgag200_fb.c b/drivers/gpu/drm/mgag200/mgag200_fb.c
index 964f58c..005b60a 100644
--- a/drivers/gpu/drm/mgag200/mgag200_fb.c
+++ b/drivers/gpu/drm/mgag200/mgag200_fb.c
@@ -282,6 +282,11 @@
{
struct mga_fbdev *mfbdev;
int ret;
+ int bpp_sel = 32;
+
+ /* prefer 16bpp on low end gpus with limited VRAM */
+ if (IS_G200_SE(mdev) && mdev->mc.vram_size < (2048*1024))
+ bpp_sel = 16;
mfbdev = devm_kzalloc(mdev->dev->dev, sizeof(struct mga_fbdev), GFP_KERNEL);
if (!mfbdev)
@@ -301,7 +306,7 @@
/* disable all the possible outputs/crtcs before entering KMS mode */
drm_helper_disable_unused_functions(mdev->dev);
- drm_fb_helper_initial_config(&mfbdev->helper, 32);
+ drm_fb_helper_initial_config(&mfbdev->helper, bpp_sel);
return 0;
}
diff --git a/drivers/gpu/drm/mgag200/mgag200_main.c b/drivers/gpu/drm/mgag200/mgag200_main.c
index a1bfe72..26868e5 100644
--- a/drivers/gpu/drm/mgag200/mgag200_main.c
+++ b/drivers/gpu/drm/mgag200/mgag200_main.c
@@ -217,7 +217,10 @@
drm_mode_config_init(dev);
dev->mode_config.funcs = (void *)&mga_mode_funcs;
- dev->mode_config.preferred_depth = 24;
+ if (IS_G200_SE(mdev) && mdev->mc.vram_size < (2048*1024))
+ dev->mode_config.preferred_depth = 16;
+ else
+ dev->mode_config.preferred_depth = 24;
dev->mode_config.prefer_shadow = 1;
r = mgag200_modeset_init(mdev);