On Thu, Aug 03, 2017 at 11:19:09AM -0500, David Lechner wrote:
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
drivers/gpu/drm/drm_fb_helper.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index 24a721a..a98bf86 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -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 +2433,24 @@ static void drm_setup_crtcs(struct drm_fb_helper *fb_helper, */ 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;
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.height = connector->display_info.width_mm;info->var.width = connector->display_info.height_mm;break;}}
Ok, small trapdoor I didn't highlight: Accessing the connector prope state (i.e. ->status and ->display_info) requires that you hold dev->mode_config.mutex. See how it's done in drm_setup_crtcs, just wrap it around this loop here.
fbdev state itself is protected by fb_helper->lock, so that part is all good.
I've applied patch 1 already, but can you pls respin that one with the locking fixed up?
Thanks, Daniel
}
/* Note: Drops fb_helper->lock before returning. */
2.7.4
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