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drm/fb-helper: pass physical dimensions to fbdev

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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.

This has to be done in drm_setup_crtcs_fb() instead of drm_setup_crtcs()
because fb_helper->fbdev may be NULL in drm_setup_crtcs().

Signed-off-by: David Lechner <david@lechnology.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1501863924-7154-1-git-send-email-david@lechnology.com
This commit is contained in:
David Lechner 2017-08-04 11:25:24 -05:00 committed by Daniel Vetter
parent adb8a5a5eb
commit 991a399990
1 changed files with 15 additions and 2 deletions
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17
drivers/gpu/drm/drm_fb_helper.c
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@ -1882,8 +1882,6 @@ 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;
switch (fb->format->depth) {
case 8:
@ -2435,11 +2433,26 @@ out:
*/
static void drm_setup_crtcs_fb(struct drm_fb_helper *fb_helper)
{
struct fb_info *info = fb_helper->fbdev;
int i;
for (i = 0; i < fb_helper->crtc_count; i++)
if (fb_helper->crtc_info[i].mode_set.num_connectors)
fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
mutex_lock(&fb_helper->dev->mode_config.mutex);
drm_fb_helper_for_each_connector(fb_helper, i) {
struct drm_connector *connector =
fb_helper->connector_info[i]->connector;
/* use first connected connector for the physical dimensions */
if (connector->status == connector_status_connected) {
info->var.width = connector->display_info.width_mm;
info->var.height = connector->display_info.height_mm;
break;
}
}
mutex_unlock(&fb_helper->dev->mode_config.mutex);
}
/* Note: Drops fb_helper->lock before returning. */