Hi David,
Thank you for the patch.
On Friday 04 Aug 2017 11:25:24 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.
I'm curious, what's your use case for this ? What userspace software do you
use that is still based on fbdev and needs screen dimensions ?
> 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().
> ---
>
> 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.
>
> v3 changes:
> * Add new patch to handle post-fb allocation crcts setup.
> * Use new drm_setup_crtcs_fb() function from new patch to avoid duplication
> of code.
>
> v4 changes:
> * Drop patch "drm/fb-helper: add new drm_setup_crtcs_fb() function" since it
> has been applied already.
> * Add mutex lock.
>
> v5 changes:
> * Fix height = width mismatch.
>
> drivers/gpu/drm/drm_fb_helper.c | 17 +++++++++++++++--
> 1 file changed, 15 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_fb_helper.c
> b/drivers/gpu/drm/drm_fb_helper.c index 4447a28..24787d6 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 +2433,26 @@ 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;
> +
> + 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. */
--
Regards,
Laurent Pinchart
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