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Message-ID: <87jze1y3mb.fsf@intel.com>
Date: Mon, 21 Oct 2024 16:42:04 +0300
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: Vamsi Krishna Brahmajosyula <vamsikrishna.brahmajosyula@...il.com>,
maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
tzimmermann@...e.de, airlied@...il.com, simona@...ll.ch
Cc: skhan@...uxfoundation.org, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/edid: transition to passing struct cea_db * to
cae_db_payload_len
On Fri, 11 Oct 2024, Vamsi Krishna Brahmajosyula <vamsikrishna.brahmajosyula@...il.com> wrote:
> Address the FIXME in cea_db_payload_len
> Transition to passing struct cea_db * everywhere
You've misunderstood the comment. The point is to pass struct cea_db *
around, not to stick to u8 * and drop calls to cea_db_payload_len().
BR,
Jani.
>
> Precompute the payload length in drm_parse_cea_ext and pass to
> individual parsers to avoid casting struct cea_db pointer to u8
> pointer where length is needed.
>
> Since the type of payload length is inconsistent in the file,
> use u8, u16 where it was already in place, use int elsewhere.
>
> Signed-off-by: Vamsi Krishna Brahmajosyula <vamsikrishna.brahmajosyula@...il.com>
> ---
> drivers/gpu/drm/drm_edid.c | 63 ++++++++++++++++----------------------
> 1 file changed, 27 insertions(+), 36 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 855beafb76ff..80442e8b8ac6 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -4977,11 +4977,8 @@ static int cea_db_tag(const struct cea_db *db)
> return db->tag_length >> 5;
> }
>
> -static int cea_db_payload_len(const void *_db)
> +static int cea_db_payload_len(const struct cea_db *db)
> {
> - /* FIXME: Transition to passing struct cea_db * everywhere. */
> - const struct cea_db *db = _db;
> -
> return db->tag_length & 0x1f;
> }
>
> @@ -5432,22 +5429,18 @@ static uint8_t hdr_metadata_type(const u8 *edid_ext)
> }
>
> static void
> -drm_parse_hdr_metadata_block(struct drm_connector *connector, const u8 *db)
> +drm_parse_hdr_metadata_block(struct drm_connector *connector, const u8 *db, const u16 payload_len)
> {
> - u16 len;
> -
> - len = cea_db_payload_len(db);
> -
> connector->hdr_sink_metadata.hdmi_type1.eotf =
> eotf_supported(db);
> connector->hdr_sink_metadata.hdmi_type1.metadata_type =
> hdr_metadata_type(db);
>
> - if (len >= 4)
> + if (payload_len >= 4)
> connector->hdr_sink_metadata.hdmi_type1.max_cll = db[4];
> - if (len >= 5)
> + if (payload_len >= 5)
> connector->hdr_sink_metadata.hdmi_type1.max_fall = db[5];
> - if (len >= 6) {
> + if (payload_len >= 6) {
> connector->hdr_sink_metadata.hdmi_type1.min_cll = db[6];
>
> /* Calculate only when all values are available */
> @@ -5457,20 +5450,18 @@ drm_parse_hdr_metadata_block(struct drm_connector *connector, const u8 *db)
>
> /* HDMI Vendor-Specific Data Block (HDMI VSDB, H14b-VSDB) */
> static void
> -drm_parse_hdmi_vsdb_audio(struct drm_connector *connector, const u8 *db)
> +drm_parse_hdmi_vsdb_audio(struct drm_connector *connector, const u8 *db, u8 payload_len)
> {
> - u8 len = cea_db_payload_len(db);
> -
> - if (len >= 6 && (db[6] & (1 << 7)))
> + if (payload_len >= 6 && (db[6] & (1 << 7)))
> connector->eld[DRM_ELD_SAD_COUNT_CONN_TYPE] |= DRM_ELD_SUPPORTS_AI;
>
> - if (len >= 10 && hdmi_vsdb_latency_present(db)) {
> + if (payload_len >= 10 && hdmi_vsdb_latency_present(db)) {
> connector->latency_present[0] = true;
> connector->video_latency[0] = db[9];
> connector->audio_latency[0] = db[10];
> }
>
> - if (len >= 12 && hdmi_vsdb_i_latency_present(db)) {
> + if (payload_len >= 12 && hdmi_vsdb_i_latency_present(db)) {
> connector->latency_present[1] = true;
> connector->video_latency[1] = db[11];
> connector->audio_latency[1] = db[12];
> @@ -5695,7 +5686,7 @@ static void drm_edid_to_eld(struct drm_connector *connector,
> case CTA_DB_VENDOR:
> /* HDMI Vendor-Specific Data Block */
> if (cea_db_is_hdmi_vsdb(db))
> - drm_parse_hdmi_vsdb_audio(connector, (const u8 *)db);
> + drm_parse_hdmi_vsdb_audio(connector, (const u8 *)db, len);
> break;
> default:
> break;
> @@ -6122,7 +6113,7 @@ static void drm_parse_ycbcr420_deep_color_info(struct drm_connector *connector,
> }
>
> static void drm_parse_dsc_info(struct drm_hdmi_dsc_cap *hdmi_dsc,
> - const u8 *hf_scds)
> + const u8 *hf_scds, int payload_len)
> {
> hdmi_dsc->v_1p2 = hf_scds[11] & DRM_EDID_DSC_1P2;
>
> @@ -6142,7 +6133,7 @@ static void drm_parse_dsc_info(struct drm_hdmi_dsc_cap *hdmi_dsc,
> /* Supports min 8 BPC if DSC 1.2 is supported*/
> hdmi_dsc->bpc_supported = 8;
>
> - if (cea_db_payload_len(hf_scds) >= 12 && hf_scds[12]) {
> + if (payload_len >= 12 && hf_scds[12]) {
> u8 dsc_max_slices;
> u8 dsc_max_frl_rate;
>
> @@ -6188,13 +6179,13 @@ static void drm_parse_dsc_info(struct drm_hdmi_dsc_cap *hdmi_dsc,
> }
> }
>
> - if (cea_db_payload_len(hf_scds) >= 13 && hf_scds[13])
> + if (payload_len >= 13 && hf_scds[13])
> hdmi_dsc->total_chunk_kbytes = hf_scds[13] & DRM_EDID_DSC_TOTAL_CHUNK_KBYTES;
> }
>
> /* Sink Capability Data Structure */
> static void drm_parse_hdmi_forum_scds(struct drm_connector *connector,
> - const u8 *hf_scds)
> + const u8 *hf_scds, int payload_len)
> {
> struct drm_display_info *info = &connector->display_info;
> struct drm_hdmi_info *hdmi = &info->hdmi;
> @@ -6247,8 +6238,8 @@ static void drm_parse_hdmi_forum_scds(struct drm_connector *connector,
>
> drm_parse_ycbcr420_deep_color_info(connector, hf_scds);
>
> - if (cea_db_payload_len(hf_scds) >= 11 && hf_scds[11]) {
> - drm_parse_dsc_info(hdmi_dsc, hf_scds);
> + if (payload_len >= 11 && hf_scds[11]) {
> + drm_parse_dsc_info(hdmi_dsc, hf_scds, payload_len);
> dsc_support = true;
> }
>
> @@ -6259,7 +6250,7 @@ static void drm_parse_hdmi_forum_scds(struct drm_connector *connector,
> }
>
> static void drm_parse_hdmi_deep_color_info(struct drm_connector *connector,
> - const u8 *hdmi)
> + const u8 *hdmi, const u8 payload_len)
> {
> struct drm_display_info *info = &connector->display_info;
> unsigned int dc_bpc = 0;
> @@ -6267,7 +6258,7 @@ static void drm_parse_hdmi_deep_color_info(struct drm_connector *connector,
> /* HDMI supports at least 8 bpc */
> info->bpc = 8;
>
> - if (cea_db_payload_len(hdmi) < 6)
> + if (payload_len < 6)
> return;
>
> if (hdmi[6] & DRM_EDID_HDMI_DC_30) {
> @@ -6320,18 +6311,17 @@ static void drm_parse_hdmi_deep_color_info(struct drm_connector *connector,
>
> /* HDMI Vendor-Specific Data Block (HDMI VSDB, H14b-VSDB) */
> static void
> -drm_parse_hdmi_vsdb_video(struct drm_connector *connector, const u8 *db)
> +drm_parse_hdmi_vsdb_video(struct drm_connector *connector, const u8 *db, const u8 payload_len)
> {
> struct drm_display_info *info = &connector->display_info;
> - u8 len = cea_db_payload_len(db);
>
> info->is_hdmi = true;
>
> info->source_physical_address = (db[4] << 8) | db[5];
>
> - if (len >= 6)
> + if (payload_len >= 6)
> info->dvi_dual = db[6] & 1;
> - if (len >= 7)
> + if (payload_len >= 7)
> info->max_tmds_clock = db[7] * 5000;
>
> /*
> @@ -6340,14 +6330,14 @@ drm_parse_hdmi_vsdb_video(struct drm_connector *connector, const u8 *db)
> * HDMI infoframe support was first added in HDMI 1.4. Assume the sink
> * supports infoframes if HDMI_Video_present is set.
> */
> - if (len >= 8 && db[8] & BIT(5))
> + if (payload_len >= 8 && db[8] & BIT(5))
> info->has_hdmi_infoframe = true;
>
> drm_dbg_kms(connector->dev, "[CONNECTOR:%d:%s] HDMI: DVI dual %d, max TMDS clock %d kHz\n",
> connector->base.id, connector->name,
> info->dvi_dual, info->max_tmds_clock);
>
> - drm_parse_hdmi_deep_color_info(connector, db);
> + drm_parse_hdmi_deep_color_info(connector, db, payload_len);
> }
>
> /*
> @@ -6410,12 +6400,13 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
> cea_db_iter_for_each(db, &iter) {
> /* FIXME: convert parsers to use struct cea_db */
> const u8 *data = (const u8 *)db;
> + int len = cea_db_payload_len(db);
>
> if (cea_db_is_hdmi_vsdb(db))
> - drm_parse_hdmi_vsdb_video(connector, data);
> + drm_parse_hdmi_vsdb_video(connector, data, len);
> else if (cea_db_is_hdmi_forum_vsdb(db) ||
> cea_db_is_hdmi_forum_scdb(db))
> - drm_parse_hdmi_forum_scds(connector, data);
> + drm_parse_hdmi_forum_scds(connector, data, len);
> else if (cea_db_is_microsoft_vsdb(db))
> drm_parse_microsoft_vsdb(connector, data);
> else if (cea_db_is_y420cmdb(db))
> @@ -6425,7 +6416,7 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
> else if (cea_db_is_vcdb(db))
> drm_parse_vcdb(connector, data);
> else if (cea_db_is_hdmi_hdr_metadata_block(db))
> - drm_parse_hdr_metadata_block(connector, data);
> + drm_parse_hdr_metadata_block(connector, data, len);
> else if (cea_db_tag(db) == CTA_DB_VIDEO)
> parse_cta_vdb(connector, db);
> else if (cea_db_tag(db) == CTA_DB_AUDIO)
>
> base-commit: 1d227fcc72223cbdd34d0ce13541cbaab5e0d72f
--
Jani Nikula, Intel
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