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Message-ID: <CAJvTgAjb1h=1vn3MVNbTu=qrxf2zaG1RgF4jTM3uobTfpd9YRw@mail.gmail.com>
Date: Mon, 21 Oct 2024 19:21:58 +0530
From: Vamsi Krishna Brahmajosyula <vamsikrishna.brahmajosyula@...il.com>
To: Jani Nikula <jani.nikula@...ux.intel.com>
Cc: maarten.lankhorst@...ux.intel.com, mripard@...nel.org, tzimmermann@...e.de,
airlied@...il.com, simona@...ll.ch, 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 Mon, Oct 21, 2024 at 7:12 PM Jani Nikula <jani.nikula@...ux.intel.com> wrote:
>
> 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().
>
Thank you for the response.
Would below be an acceptable change for the FIXME?
1. Use a macro to extract length from (db->tag_length & 0x1f)
2. Pass struct cea_db * to all individual parsers
3. Use db->data? / convert to u8 and use db[i] where needed.
> 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
Thanks,
Vamsi
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