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 <da...@lechnology.com>
---
v1 changes (from RFC):
* Use loop to get info from first connected connector instead of just the
first connector.
v2 changes:
* Update width in height in drm_setup_crtcs() also to handle hotplug events.
As mentioned in the comments below, drm_setup_crtcs() can't set these values
during init because the data structure hasn't been allocated yet, so we end up
doing the same thing in two different places.
drivers/gpu/drm/drm_fb_helper.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index b2a01d1..7813b86 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -1884,6 +1884,7 @@ 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;
@@ -1896,6 +1897,18 @@ 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;
@@ -2355,6 +2368,7 @@ static void drm_setup_crtcs(struct drm_fb_helper
*fb_helper,
struct drm_display_mode **modes;
struct drm_fb_offset *offsets;
bool *enabled;
+ bool var_updated = false;
int i;
DRM_DEBUG_KMS("\n");
@@ -2429,6 +2443,23 @@ static void drm_setup_crtcs(struct drm_fb_helper
*fb_helper,
modeset->fb = fb_helper->fb;
modeset->x = offset->x;
modeset->y = offset->y;
+
+ /*
+ * During init, drm_setup_crtcs() is called before the
+ * fbdev is allocated, so this only affects hotplug
+ * events.
+ * Only the info from the first connected connector is
+ * used.
+ */
+ if (!var_updated && fb_helper->fbdev &&
+ connector->status == connector_status_connected) {
+ struct fb_var_screeninfo *var =
+ &fb_helper->fbdev->var;
+
+ var->width = connector->display_info.width_mm;
+ var->height = connector->display_info.height_mm;
+ var_updated = true;
+ }
}
}
out:
--
2.7.4
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