fbdev has a place for the physical width and height of a display. I would like to have this information available to userspace. This patch works for me, but I have a strong suspicion that this is not the "right way".
Any suggestions on how to get the proper struct drm_display_info here rather than assuming the first connector one is valid? I don't see an obvious way to do this. --- drivers/gpu/drm/drm_fb_helper.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index 574af01..ff422da 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -1768,8 +1768,14 @@ void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helpe info->var.xoffset = 0; info->var.yoffset = 0; info->var.activate = FB_ACTIVATE_NOW; - info->var.height = -1; - info->var.width = -1; + + if (fb_helper->connector_count) { + info->var.height = fb_helper->connector_info[0]->connector->display_info.width_mm; + info->var.width = fb_helper->connector_info[0]->connector->display_info.height_mm; + } else { + info->var.height = -1; + info->var.width = -1; + }
switch (fb->format->depth) { case 8: