linux-kernel - [PATCH] drm/fb-helper: pass physical dimensions to fbdev

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Date:   Tue,  1 Aug 2017 10:26:41 -0500
From:   David Lechner <david@...hnology.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     David Lechner <david@...hnology.com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/fb-helper: pass physical dimensions to fbdev

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@...hnology.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