drm/i915: Extract physical display dimensions from VBT

The VBT has these mysterious H/V image sizes as part of the display
timings. Looking at some dumps those appear to be the physical
dimensions in mm. Which makes sense since the timing descriptor matches
the format used by EDID detailed timing descriptor, which defines these
as "H/V Addressable Video Image Size in mm".

So let's use that information from the panel fixed mode to get the
physical dimensions for LVDS/eDP/DSI displays. And with that we can
fill out the display_info so that userspace can get at it via
GetConnector.

v2: Use (hi<<8)|lo instead of broken (hi<<4)+lo
    Handle LVDS and eDP too

Cc: Stephen Just <stephenjust@gmail.com>
Tested-by: Stephen Just <stephenjust@gmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96255
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1464685714-30507-1-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Mika Kahola <mika.kahola@intel.com>

diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index e04e03b..713a02d 100644 (file)
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -139,6 +139,11 @@ fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
        else
                panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
 
+       panel_fixed_mode->width_mm = (dvo_timing->himage_hi << 8) |
+               dvo_timing->himage_lo;
+       panel_fixed_mode->height_mm = (dvo_timing->vimage_hi << 8) |
+               dvo_timing->vimage_lo;
+
        /* Some VBTs have bogus h/vtotal values */
        if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
                panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 7dfff87..c92d593 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -5370,8 +5370,11 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
        if (!fixed_mode && dev_priv->vbt.lfp_lvds_vbt_mode) {
                fixed_mode = drm_mode_duplicate(dev,
                                        dev_priv->vbt.lfp_lvds_vbt_mode);
-               if (fixed_mode)
+               if (fixed_mode) {
                        fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
+                       connector->display_info.width_mm = fixed_mode->width_mm;
+                       connector->display_info.height_mm = fixed_mode->height_mm;
+               }
        }
        mutex_unlock(&dev->mode_config.mutex);
 

diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index cbe2537..c70132a 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -1578,6 +1578,9 @@ void intel_dsi_init(struct drm_device *dev)
                goto err;
        }
 
+       connector->display_info.width_mm = fixed_mode->width_mm;
+       connector->display_info.height_mm = fixed_mode->height_mm;
+
        intel_panel_init(&intel_connector->panel, fixed_mode, NULL);
 
        intel_dsi_add_properties(intel_connector);

diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 56eb3bd..62eaa89 100644 (file)
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -1082,6 +1082,8 @@ void intel_lvds_init(struct drm_device *dev)
                fixed_mode = drm_mode_duplicate(dev, dev_priv->vbt.lfp_lvds_vbt_mode);
                if (fixed_mode) {
                        fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
+                       connector->display_info.width_mm = fixed_mode->width_mm;
+                       connector->display_info.height_mm = fixed_mode->height_mm;
                        goto out;
                }
        }

diff --git a/drivers/gpu/drm/i915/intel_vbt_defs.h b/drivers/gpu/drm/i915/intel_vbt_defs.h
index 4f9799f..68db962 100644 (file)
--- a/drivers/gpu/drm/i915/intel_vbt_defs.h
+++ b/drivers/gpu/drm/i915/intel_vbt_defs.h
@@ -403,9 +403,10 @@ struct lvds_dvo_timing {
        u8 vsync_off:4;
        u8 rsvd0:6;
        u8 hsync_off_hi:2;
-       u8 h_image;
-       u8 v_image;
-       u8 max_hv;
+       u8 himage_lo;
+       u8 vimage_lo;
+       u8 vimage_hi:4;
+       u8 himage_hi:4;
        u8 h_border;
        u8 v_border;
        u8 rsvd1:3;