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Subject[PATCH] drm/fb-helper: pass physical dimensions to fbdev
Date
The fbdev subsystem has a place for physical dimensions (width and height
in mm) that is readable by userspace. Since DRM also knows these
dimensions, pass this information to the fbdev device.

Signed-off-by: David Lechner <david@lechnology.com>
---
drivers/gpu/drm/drm_fb_helper.c | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 574af01..07a6621 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -1759,6 +1759,7 @@ void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helpe
uint32_t fb_width, uint32_t fb_height)
{
struct drm_framebuffer *fb = fb_helper->fb;
+ int i;

info->pseudo_palette = fb_helper->pseudo_palette;
info->var.xres_virtual = fb->width;
@@ -1771,6 +1772,18 @@ void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helpe
info->var.height = -1;
info->var.width = -1;

+ drm_fb_helper_for_each_connector(fb_helper, i) {
+ struct drm_connector *connector =
+ fb_helper->connector_info[i]->connector;
+
+ /* use the first connected connector for the physical dimensions */
+ if (connector->status == connector_status_connected) {
+ info->var.height = connector->display_info.width_mm;
+ info->var.width = connector->display_info.height_mm;
+ break;
+ }
+ }
+
switch (fb->format->depth) {
case 8:
info->var.red.offset = 0;
--
2.7.4
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