On Wed, Feb 01, 2017 at 06:14:38PM +0530, Shashank Sharma wrote:
> This patch does following:
> - Adds a new structure (drm_hdmi_info) in drm_display_info.
> This structure will be used to save and indicate if sink
> supports advance HDMI 2.0 features
> - Checks the HF-VSDB block for presence of SCDC, and marks it
> in hdmi_info structure.
> - If SCDC is present, checks if sink is capable of generating
> scdc read request, and marks it in hdmi_info structure.
>
> Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxxxx>
> ---
> drivers/gpu/drm/drm_edid.c | 14 ++++++++++++++
> include/drm/drm_connector.h | 26 ++++++++++++++++++++++++++
> 2 files changed, 40 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 96d3e47..37902e5 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -3802,6 +3802,18 @@ enum hdmi_quantization_range
> }
> EXPORT_SYMBOL(drm_default_rgb_quant_range);
>
> +static void drm_detect_hdmi_scdc(struct drm_connector *connector,
> + const u8 *hf_vsdb)
> +{
> + struct drm_hdmi_info *hdmi = &connector->display_info.hdmi_info;
> +
> + if (hf_vsdb[6] & 0x80) {
> + hdmi->scdc_supported = true;
> + if (hf_vsdb[6] & 0x40)
> + hdmi->scdc_rr = true;
> + }
> +}
> +
> static void drm_parse_hdmi_deep_color_info(struct drm_connector *connector,
> const u8 *hdmi)
> {
> @@ -3916,6 +3928,8 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
>
> if (cea_db_is_hdmi_vsdb(db))
> drm_parse_hdmi_vsdb_video(connector, db);
> + if (cea_db_is_hdmi_forum_vsdb(db))
> + drm_detect_hdmi_scdc(connector, db);
> }
> }
>
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index e5e1edd..2435598 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -87,6 +87,27 @@ enum subpixel_order {
> SubPixelVerticalRGB,
> SubPixelVerticalBGR,
> SubPixelNone,
> +
> +};
> +
> +/**
> + * struct drm_hdmi_info - runtime data about the connected sink
> + *
> + * Describes if a given hdmi display supports advance HDMI 2.0 featutes.
> + * This information is available in CEA-861-F extension blocks (like
> + * HF-VSDB)
> + * For sinks which provide an EDID this can be filled out by calling
> + * drm_add_edid_modes().
> + */
> +struct drm_hdmi_info {
> + /**
> + * @scdc_supported: status control & data channel present.
> + */
> + bool scdc_supported;
> + /**
> + * @scdc_rr: sink is capable of generating scdc read request.
> + */
> + bool scdc_rr;
Probably worth spelling the thing out.
> };
>
> /**
> @@ -188,6 +209,11 @@ struct drm_display_info {
> * @cea_rev: CEA revision of the HDMI sink.
> */
> u8 cea_rev;
> +
> + /**
> + * @hdmi_info: advance features of a HDMI sink.
> + */
> + struct drm_hdmi_info hdmi_info;
> };
>
> int drm_display_info_set_bus_formats(struct drm_display_info *info,
> --
> 1.9.1
--
Ville Syrjälä
Intel OTC
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