[PATCH 1/3] drm/edid: parse multiple CEA extension block
Ville Syrjälä
ville.syrjala at linux.intel.com
Fri Feb 25 17:47:18 UTC 2022
On Thu, Feb 24, 2022 at 10:16:23PM +0800, Lee Shawn C wrote:
> Try to find and parse more CEA ext blocks if edid->extensions
> is greater than one.
>
> Cc: Jani Nikula <jani.nikula at linux.intel.com>
> Cc: Ville Syrjala <ville.syrjala at linux.intel.com>
> Cc: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
> Signed-off-by: Lee Shawn C <shawn.c.lee at intel.com>
> ---
> drivers/gpu/drm/drm_edid.c | 110 ++++++++++++++++++++-----------------
> 1 file changed, 60 insertions(+), 50 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index a504542238ed..19426f28b411 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -3353,16 +3353,14 @@ const u8 *drm_find_edid_extension(const struct edid *edid,
> return edid_ext;
> }
>
> -static const u8 *drm_find_cea_extension(const struct edid *edid)
> +static const u8 *drm_find_cea_extension(const struct edid *edid, int *ext_index)
> {
> const struct displayid_block *block;
> struct displayid_iter iter;
> const u8 *cea;
> - int ext_index = 0;
>
> - /* Look for a top level CEA extension block */
> - /* FIXME: make callers iterate through multiple CEA ext blocks? */
> - cea = drm_find_edid_extension(edid, CEA_EXT, &ext_index);
> + /* Look for a CEA extension block from ext_index */
> + cea = drm_find_edid_extension(edid, CEA_EXT, ext_index);
> if (cea)
> return cea;
>
> @@ -3643,10 +3641,10 @@ add_alternate_cea_modes(struct drm_connector *connector, struct edid *edid)
> struct drm_device *dev = connector->dev;
> struct drm_display_mode *mode, *tmp;
> LIST_HEAD(list);
> - int modes = 0;
> + int modes = 0, ext_index = 0;
>
> /* Don't add CEA modes if the CEA extension block is missing */
> - if (!drm_find_cea_extension(edid))
> + if (!drm_find_cea_extension(edid, &ext_index))
> return 0;
>
> /*
> @@ -4321,46 +4319,58 @@ static void drm_parse_y420cmdb_bitmap(struct drm_connector *connector,
> static int
> add_cea_modes(struct drm_connector *connector, struct edid *edid)
> {
> - const u8 *cea = drm_find_cea_extension(edid);
> + const u8 *cea = NULL;
> const u8 *db, *hdmi = NULL, *video = NULL;
> u8 dbl, hdmi_len, video_len = 0;
> - int modes = 0;
> + int modes = 0, ext_index = 0;
>
> - if (cea && cea_revision(cea) >= 3) {
> - int i, start, end;
> + for (;;) {
> + cea = drm_find_cea_extension(edid, &ext_index);
Please split this into two patches:
1. do the *ext_index stuff
2. do the loop
>
> - if (cea_db_offsets(cea, &start, &end))
> - return 0;
> + if (!cea)
> + break;
>
> - for_each_cea_db(cea, i, start, end) {
> - db = &cea[i];
> - dbl = cea_db_payload_len(db);
> + if (cea && cea_revision(cea) >= 3) {
> + int i, start, end;
> +
> + if (cea_db_offsets(cea, &start, &end))
> + continue;
>
> - if (cea_db_tag(db) == VIDEO_BLOCK) {
> - video = db + 1;
> - video_len = dbl;
> - modes += do_cea_modes(connector, video, dbl);
> - } else if (cea_db_is_hdmi_vsdb(db)) {
> - hdmi = db;
> - hdmi_len = dbl;
> - } else if (cea_db_is_y420vdb(db)) {
> - const u8 *vdb420 = &db[2];
> -
> - /* Add 4:2:0(only) modes present in EDID */
> - modes += do_y420vdb_modes(connector,
> - vdb420,
> - dbl - 1);
> + for_each_cea_db(cea, i, start, end) {
> + db = &cea[i];
> + dbl = cea_db_payload_len(db);
> +
> + if (cea_db_tag(db) == VIDEO_BLOCK) {
> + video = db + 1;
> + video_len = dbl;
> + modes += do_cea_modes(connector, video, dbl);
> + } else if (cea_db_is_hdmi_vsdb(db)) {
> + hdmi = db;
> + hdmi_len = dbl;
> + } else if (cea_db_is_y420vdb(db)) {
> + const u8 *vdb420 = &db[2];
> +
> + /* Add 4:2:0(only) modes present in EDID */
> + modes += do_y420vdb_modes(connector,
> + vdb420,
> + dbl - 1);
> + }
> }
> }
> - }
>
> - /*
> - * We parse the HDMI VSDB after having added the cea modes as we will
> - * be patching their flags when the sink supports stereo 3D.
> - */
> - if (hdmi)
> - modes += do_hdmi_vsdb_modes(connector, hdmi, hdmi_len, video,
> - video_len);
> + /*
> + * We parse the HDMI VSDB after having added the cea modes as we will
> + * be patching their flags when the sink supports stereo 3D.
> + */
> + if (hdmi) {
Looks like you're potentially using stale information here from
previous loops. Please move all the possible variables to a tighter
scope so this can't happen.
> + modes += do_hdmi_vsdb_modes(connector, hdmi, hdmi_len, video,
> + video_len);
> + hdmi = NULL;
> + video = NULL;
> + hdmi_len = 0;
> + video_len = 0;
> + }
> + }
>
> return modes;
> }
> @@ -4562,7 +4572,7 @@ static void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
> uint8_t *eld = connector->eld;
> const u8 *cea;
> const u8 *db;
> - int total_sad_count = 0;
> + int total_sad_count = 0, ext_index = 0;
> int mnl;
> int dbl;
>
> @@ -4571,7 +4581,7 @@ static void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
> if (!edid)
> return;
>
> - cea = drm_find_cea_extension(edid);
> + cea = drm_find_cea_extension(edid, &ext_index);
> if (!cea) {
> DRM_DEBUG_KMS("ELD: no CEA Extension found\n");
> return;
> @@ -4655,11 +4665,11 @@ static void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid)
> */
> int drm_edid_to_sad(struct edid *edid, struct cea_sad **sads)
> {
> - int count = 0;
> + int count = 0, ext_index = 0;
> int i, start, end, dbl;
> const u8 *cea;
>
> - cea = drm_find_cea_extension(edid);
> + cea = drm_find_cea_extension(edid, &ext_index);
> if (!cea) {
> DRM_DEBUG_KMS("SAD: no CEA Extension found\n");
> return 0;
> @@ -4717,11 +4727,11 @@ EXPORT_SYMBOL(drm_edid_to_sad);
> */
> int drm_edid_to_speaker_allocation(struct edid *edid, u8 **sadb)
> {
> - int count = 0;
> + int count = 0, ext_index = 0;
> int i, start, end, dbl;
> const u8 *cea;
>
> - cea = drm_find_cea_extension(edid);
> + cea = drm_find_cea_extension(edid, &ext_index);
> if (!cea) {
> DRM_DEBUG_KMS("SAD: no CEA Extension found\n");
> return 0;
> @@ -4813,10 +4823,10 @@ EXPORT_SYMBOL(drm_av_sync_delay);
> bool drm_detect_hdmi_monitor(struct edid *edid)
> {
> const u8 *edid_ext;
> - int i;
> + int i, ext_index = 0;
> int start_offset, end_offset;
>
> - edid_ext = drm_find_cea_extension(edid);
> + edid_ext = drm_find_cea_extension(edid, &ext_index);
> if (!edid_ext)
> return false;
>
> @@ -4851,11 +4861,11 @@ EXPORT_SYMBOL(drm_detect_hdmi_monitor);
> bool drm_detect_monitor_audio(struct edid *edid)
> {
> const u8 *edid_ext;
> - int i, j;
> + int i, j, ext_index = 0;
> bool has_audio = false;
> int start_offset, end_offset;
>
> - edid_ext = drm_find_cea_extension(edid);
> + edid_ext = drm_find_cea_extension(edid, &ext_index);
> if (!edid_ext)
> goto end;
>
> @@ -5177,9 +5187,9 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
> {
> struct drm_display_info *info = &connector->display_info;
> const u8 *edid_ext;
> - int i, start, end;
> + int i, start, end, ext_index = 0;
>
> - edid_ext = drm_find_cea_extension(edid);
> + edid_ext = drm_find_cea_extension(edid, &ext_index);
> if (!edid_ext)
> return;
>
> --
> 2.17.1
--
Ville Syrjälä
Intel
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