[Intel-gfx] [PATCH] drm/i915: Extract physical display dimensions from VBT

[Mika Kahola]

Reviewed-by: Mika Kahola <mika.kahola at intel.com>

On Tue, 2016-05-31 at 12:08 +0300, ville.syrjala at linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> 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 at gmail.com>
> Tested-by: Stephen Just <stephenjust at gmail.com> (v1)
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96255
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_bios.c     | 5 +++++
>  drivers/gpu/drm/i915/intel_dp.c       | 5 ++++-
>  drivers/gpu/drm/i915/intel_dsi.c      | 3 +++
>  drivers/gpu/drm/i915/intel_lvds.c     | 2 ++
>  drivers/gpu/drm/i915/intel_vbt_defs.h | 7 ++++---
>  5 files changed, 18 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
> index 624e755e451f..2ddc469170cd 100644
> --- 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 096acbf04003..46f62beaf4fb 100644
> --- 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 cbe2537f26f4..c70132aa91d5 100644
> --- 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 56eb3bdcdb5c..62eaa895fe5b 100644
> --- 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 4f9799f025a9..68db9621f1f0 100644
> --- 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;

-- 
Mika Kahola - Intel OTC