Re: [v8 02/10] drm: Parse HDR metadata info from EDID

["Kazlauskas, Nicholas" <Nicholas.Kazlauskas@amd.com>]

On 4/9/19 12:44 PM, Uma Shankar wrote:
> HDR metadata block is introduced in CEA-861.3 spec.
> Parsing the same to get the panel's HDR metadata.
> 
> v2: Rebase and added Ville's POC changes to the patch.
> 
> v3: No Change
> 
> v4: Addressed Shashank's review comments
> 
> v5: Addressed Shashank's comment and added his RB.
> 
> v6: Addressed Jonas Karlman review comments.
> 
> Signed-off-by: Uma Shankar <uma.shankar@intel.com>
> Reviewed-by: Shashank Sharma <shashank.sharma@intel.com>
> ---
>   drivers/gpu/drm/drm_edid.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++
>   1 file changed, 52 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 2c22ea4..1fc371b 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -2830,6 +2830,7 @@ static int drm_cvt_modes(struct drm_connector *connector,
>   #define VIDEO_BLOCK     0x02
>   #define VENDOR_BLOCK    0x03
>   #define SPEAKER_BLOCK	0x04
> +#define HDR_STATIC_METADATA_BLOCK	0x6
>   #define USE_EXTENDED_TAG 0x07
>   #define EXT_VIDEO_CAPABILITY_BLOCK 0x00
>   #define EXT_VIDEO_DATA_BLOCK_420	0x0E
> @@ -3577,6 +3578,12 @@ static int add_3d_struct_modes(struct drm_connector *connector, u16 structure,
>   }
>   
>   static int
> +cea_db_payload_len_ext(const u8 *db)
> +{
> +	return (db[0] & 0x1f) - 1;
> +}
> +
> +static int
>   cea_db_extended_tag(const u8 *db)
>   {
>   	return db[1];
> @@ -3812,6 +3819,49 @@ static void fixup_detailed_cea_mode_clock(struct drm_display_mode *mode)
>   	mode->clock = clock;
>   }
>   
> +static bool cea_db_is_hdmi_hdr_metadata_block(const u8 *db)
> +{
> +	if (cea_db_tag(db) != USE_EXTENDED_TAG)
> +		return false;
> +
> +	if (db[1] != HDR_STATIC_METADATA_BLOCK)
> +		return false;

Shouldn't this just be cea_db_extended_tag(db) != HDR_STATIC_METADATA_BLOCK?

Also, the other functions all check that we're given a valid here here with:

if (!cea_db_payload_len_ext(db))
     return false;

Is there any reason this isn't done here?


> +
> +	return true;
> +}
> +
> +static uint8_t eotf_supported(const u8 *edid_ext)
> +{
> +	return edid_ext[2] &
> +		(BIT(HDMI_EOTF_TRADITIONAL_GAMMA_SDR) |
> +		 BIT(HDMI_EOTF_TRADITIONAL_GAMMA_HDR) |
> +		 BIT(HDMI_EOTF_SMPTE_ST2084));
> +}
> +
> +static uint8_t hdr_metadata_type(const u8 *edid_ext)
> +{
> +	return edid_ext[3] &
> +		BIT(HDMI_STATIC_METADATA_TYPE1);
> +}
> +
> +static void
> +drm_parse_hdr_metadata_block(struct drm_connector *connector, const u8 *db)
> +{
> +	u16 len;
> +
> +	len = cea_db_payload_len_ext(db);
> +	connector->hdr_sink_metadata.hdmi_type1.eotf = eotf_supported(db);
> +	connector->hdr_sink_metadata.hdmi_type1.metadata_type =
> +					hdr_metadata_type(db);

While metadata_type is assigned here like it should be, it isn't 
assigned to the outer metadata_type in the hdr_sink_metadata. I also 
can't see anything in the other patches that assigns this anywhere.

Shouldn't it also be set here?

> +
> +	if (len >= 4)
> +		connector->hdr_sink_metadata.hdmi_type1.max_cll = db[4];
> +	if (len >= 5)
> +		connector->hdr_sink_metadata.hdmi_type1.max_fall = db[5];
> +	if (len >= 6)
> +		connector->hdr_sink_metadata.hdmi_type1.min_cll = db[6];
> +}
> +
>   static void
>   drm_parse_hdmi_vsdb_audio(struct drm_connector *connector, const u8 *db)
>   {
> @@ -4439,6 +4489,8 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
>   			drm_parse_y420cmdb_bitmap(connector, db);
>   		if (cea_db_is_vcdb(db))
>   			drm_parse_vcdb(connector, db);
> +		if (cea_db_is_hdmi_hdr_metadata_block(db))
> +			drm_parse_hdr_metadata_block(connector, db);
>   	}
>   }
>   
> 

Nicholas Kazlauskas

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