From: Jani Nikula <jani.nikula@intel.com> To: dri-devel@lists.freedesktop.org Cc: jani.nikula@intel.com, intel-gfx@lists.freedesktop.org Subject: [CI RESEND 09/10] drm/edid: add HF-EEODB support to EDID read and allocation Date: Wed, 29 Jun 2022 12:27:54 +0300 [thread overview] Message-ID: <57b57a355d62eb91ad1e3cf555978576f2bd9fdd.1656494768.git.jani.nikula@intel.com> (raw) In-Reply-To: <cover.1656494768.git.jani.nikula@intel.com> HDMI 2.1 section 10.3.6 defines an HDMI Forum EDID Extension Override Data Block, which may contain a different extension count than the base block claims. Add support for reading more EDID data if available. The extra blocks aren't parsed yet, though. Hard-coding the EEODB parsing instead of using the iterators we have is a bit of a bummer, but we have to be able to do this on a partially allocated EDID while reading it. v2: - Check for CEA Data Block Collection size (Ville) - Amend commit message and comment about hard-coded parsing Signed-off-by: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> --- drivers/gpu/drm/drm_edid.c | 89 ++++++++++++++++++++++++++++++++++++-- 1 file changed, 86 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index a80ea0aa7b32..fa3a3e294560 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -1581,6 +1581,15 @@ static bool version_greater(const struct drm_edid *drm_edid, (edid->version == version && edid->revision > revision); } +static int edid_hfeeodb_extension_block_count(const struct edid *edid); + +static int edid_hfeeodb_block_count(const struct edid *edid) +{ + int eeodb = edid_hfeeodb_extension_block_count(edid); + + return eeodb ? eeodb + 1 : 0; +} + static int edid_extension_block_count(const struct edid *edid) { return edid->extensions; @@ -2026,6 +2035,11 @@ static struct edid *edid_filter_invalid_blocks(struct edid *edid, struct edid *new; int i, valid_blocks = 0; + /* + * Note: If the EDID uses HF-EEODB, but has invalid blocks, we'll revert + * back to regular extension count here. We don't want to start + * modifying the HF-EEODB extension too. + */ for (i = 0; i < edid_block_count(edid); i++) { const void *src_block = edid_block_data(edid, i); @@ -2261,7 +2275,7 @@ static struct edid *_drm_do_get_edid(struct drm_connector *connector, size_t *size) { enum edid_block_status status; - int i, invalid_blocks = 0; + int i, num_blocks, invalid_blocks = 0; struct edid *edid, *new; size_t alloc_size = EDID_LENGTH; @@ -2303,7 +2317,8 @@ static struct edid *_drm_do_get_edid(struct drm_connector *connector, goto fail; edid = new; - for (i = 1; i < edid_block_count(edid); i++) { + num_blocks = edid_block_count(edid); + for (i = 1; i < num_blocks; i++) { void *block = (void *)edid_block_data(edid, i); status = edid_block_read(block, i, read_block, context); @@ -2314,11 +2329,31 @@ static struct edid *_drm_do_get_edid(struct drm_connector *connector, if (status == EDID_BLOCK_READ_FAIL) goto fail; invalid_blocks++; + } else if (i == 1) { + /* + * If the first EDID extension is a CTA extension, and + * the first Data Block is HF-EEODB, override the + * extension block count. + * + * Note: HF-EEODB could specify a smaller extension + * count too, but we can't risk allocating a smaller + * amount. + */ + int eeodb = edid_hfeeodb_block_count(edid); + + if (eeodb > num_blocks) { + num_blocks = eeodb; + alloc_size = edid_size_by_blocks(num_blocks); + new = krealloc(edid, alloc_size, GFP_KERNEL); + if (!new) + goto fail; + edid = new; + } } } if (invalid_blocks) { - connector_bad_edid(connector, edid, edid_block_count(edid)); + connector_bad_edid(connector, edid, num_blocks); edid = edid_filter_invalid_blocks(edid, &alloc_size); } @@ -3851,6 +3886,7 @@ static int add_detailed_modes(struct drm_connector *connector, #define CTA_EXT_DB_HDR_STATIC_METADATA 6 #define CTA_EXT_DB_420_VIDEO_DATA 14 #define CTA_EXT_DB_420_VIDEO_CAP_MAP 15 +#define CTA_EXT_DB_HF_EEODB 0x78 #define CTA_EXT_DB_HF_SCDB 0x79 #define EDID_BASIC_AUDIO (1 << 6) @@ -4910,6 +4946,12 @@ static bool cea_db_is_hdmi_forum_vsdb(const struct cea_db *db) cea_db_payload_len(db) >= 7; } +static bool cea_db_is_hdmi_forum_eeodb(const void *db) +{ + return cea_db_is_extended_tag(db, CTA_EXT_DB_HF_EEODB) && + cea_db_payload_len(db) >= 2; +} + static bool cea_db_is_microsoft_vsdb(const struct cea_db *db) { return cea_db_is_vendor(db, MICROSOFT_IEEE_OUI) && @@ -4944,6 +4986,47 @@ static bool cea_db_is_hdmi_hdr_metadata_block(const struct cea_db *db) cea_db_payload_len(db) >= 3; } +/* + * Get the HF-EEODB override extension block count from EDID. + * + * The passed in EDID may be partially read, as long as it has at least two + * blocks (base block and one extension block) if EDID extension count is > 0. + * + * Note that this is *not* how you should parse CTA Data Blocks in general; this + * is only to handle partially read EDIDs. Normally, use the CTA Data Block + * iterators instead. + * + * References: + * - HDMI 2.1 section 10.3.6 HDMI Forum EDID Extension Override Data Block + */ +static int edid_hfeeodb_extension_block_count(const struct edid *edid) +{ + const u8 *cta; + + /* No extensions according to base block, no HF-EEODB. */ + if (!edid_extension_block_count(edid)) + return 0; + + /* HF-EEODB is always in the first EDID extension block only */ + cta = edid_extension_block_data(edid, 0); + if (edid_block_tag(cta) != CEA_EXT || cea_revision(cta) < 3) + return 0; + + /* Need to have the data block collection, and at least 3 bytes. */ + if (cea_db_collection_size(cta) < 3) + return 0; + + /* + * Sinks that include the HF-EEODB in their E-EDID shall include one and + * only one instance of the HF-EEODB in the E-EDID, occupying bytes 4 + * through 6 of Block 1 of the E-EDID. + */ + if (!cea_db_is_hdmi_forum_eeodb(&cta[4])) + return 0; + + return cta[4 + 2]; +} + static void drm_parse_y420cmdb_bitmap(struct drm_connector *connector, const u8 *db) { -- 2.30.2
WARNING: multiple messages have this Message-ID (diff)
From: Jani Nikula <jani.nikula@intel.com> To: dri-devel@lists.freedesktop.org Cc: jani.nikula@intel.com, intel-gfx@lists.freedesktop.org Subject: [Intel-gfx] [CI RESEND 09/10] drm/edid: add HF-EEODB support to EDID read and allocation Date: Wed, 29 Jun 2022 12:27:54 +0300 [thread overview] Message-ID: <57b57a355d62eb91ad1e3cf555978576f2bd9fdd.1656494768.git.jani.nikula@intel.com> (raw) In-Reply-To: <cover.1656494768.git.jani.nikula@intel.com> HDMI 2.1 section 10.3.6 defines an HDMI Forum EDID Extension Override Data Block, which may contain a different extension count than the base block claims. Add support for reading more EDID data if available. The extra blocks aren't parsed yet, though. Hard-coding the EEODB parsing instead of using the iterators we have is a bit of a bummer, but we have to be able to do this on a partially allocated EDID while reading it. v2: - Check for CEA Data Block Collection size (Ville) - Amend commit message and comment about hard-coded parsing Signed-off-by: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> --- drivers/gpu/drm/drm_edid.c | 89 ++++++++++++++++++++++++++++++++++++-- 1 file changed, 86 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index a80ea0aa7b32..fa3a3e294560 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -1581,6 +1581,15 @@ static bool version_greater(const struct drm_edid *drm_edid, (edid->version == version && edid->revision > revision); } +static int edid_hfeeodb_extension_block_count(const struct edid *edid); + +static int edid_hfeeodb_block_count(const struct edid *edid) +{ + int eeodb = edid_hfeeodb_extension_block_count(edid); + + return eeodb ? eeodb + 1 : 0; +} + static int edid_extension_block_count(const struct edid *edid) { return edid->extensions; @@ -2026,6 +2035,11 @@ static struct edid *edid_filter_invalid_blocks(struct edid *edid, struct edid *new; int i, valid_blocks = 0; + /* + * Note: If the EDID uses HF-EEODB, but has invalid blocks, we'll revert + * back to regular extension count here. We don't want to start + * modifying the HF-EEODB extension too. + */ for (i = 0; i < edid_block_count(edid); i++) { const void *src_block = edid_block_data(edid, i); @@ -2261,7 +2275,7 @@ static struct edid *_drm_do_get_edid(struct drm_connector *connector, size_t *size) { enum edid_block_status status; - int i, invalid_blocks = 0; + int i, num_blocks, invalid_blocks = 0; struct edid *edid, *new; size_t alloc_size = EDID_LENGTH; @@ -2303,7 +2317,8 @@ static struct edid *_drm_do_get_edid(struct drm_connector *connector, goto fail; edid = new; - for (i = 1; i < edid_block_count(edid); i++) { + num_blocks = edid_block_count(edid); + for (i = 1; i < num_blocks; i++) { void *block = (void *)edid_block_data(edid, i); status = edid_block_read(block, i, read_block, context); @@ -2314,11 +2329,31 @@ static struct edid *_drm_do_get_edid(struct drm_connector *connector, if (status == EDID_BLOCK_READ_FAIL) goto fail; invalid_blocks++; + } else if (i == 1) { + /* + * If the first EDID extension is a CTA extension, and + * the first Data Block is HF-EEODB, override the + * extension block count. + * + * Note: HF-EEODB could specify a smaller extension + * count too, but we can't risk allocating a smaller + * amount. + */ + int eeodb = edid_hfeeodb_block_count(edid); + + if (eeodb > num_blocks) { + num_blocks = eeodb; + alloc_size = edid_size_by_blocks(num_blocks); + new = krealloc(edid, alloc_size, GFP_KERNEL); + if (!new) + goto fail; + edid = new; + } } } if (invalid_blocks) { - connector_bad_edid(connector, edid, edid_block_count(edid)); + connector_bad_edid(connector, edid, num_blocks); edid = edid_filter_invalid_blocks(edid, &alloc_size); } @@ -3851,6 +3886,7 @@ static int add_detailed_modes(struct drm_connector *connector, #define CTA_EXT_DB_HDR_STATIC_METADATA 6 #define CTA_EXT_DB_420_VIDEO_DATA 14 #define CTA_EXT_DB_420_VIDEO_CAP_MAP 15 +#define CTA_EXT_DB_HF_EEODB 0x78 #define CTA_EXT_DB_HF_SCDB 0x79 #define EDID_BASIC_AUDIO (1 << 6) @@ -4910,6 +4946,12 @@ static bool cea_db_is_hdmi_forum_vsdb(const struct cea_db *db) cea_db_payload_len(db) >= 7; } +static bool cea_db_is_hdmi_forum_eeodb(const void *db) +{ + return cea_db_is_extended_tag(db, CTA_EXT_DB_HF_EEODB) && + cea_db_payload_len(db) >= 2; +} + static bool cea_db_is_microsoft_vsdb(const struct cea_db *db) { return cea_db_is_vendor(db, MICROSOFT_IEEE_OUI) && @@ -4944,6 +4986,47 @@ static bool cea_db_is_hdmi_hdr_metadata_block(const struct cea_db *db) cea_db_payload_len(db) >= 3; } +/* + * Get the HF-EEODB override extension block count from EDID. + * + * The passed in EDID may be partially read, as long as it has at least two + * blocks (base block and one extension block) if EDID extension count is > 0. + * + * Note that this is *not* how you should parse CTA Data Blocks in general; this + * is only to handle partially read EDIDs. Normally, use the CTA Data Block + * iterators instead. + * + * References: + * - HDMI 2.1 section 10.3.6 HDMI Forum EDID Extension Override Data Block + */ +static int edid_hfeeodb_extension_block_count(const struct edid *edid) +{ + const u8 *cta; + + /* No extensions according to base block, no HF-EEODB. */ + if (!edid_extension_block_count(edid)) + return 0; + + /* HF-EEODB is always in the first EDID extension block only */ + cta = edid_extension_block_data(edid, 0); + if (edid_block_tag(cta) != CEA_EXT || cea_revision(cta) < 3) + return 0; + + /* Need to have the data block collection, and at least 3 bytes. */ + if (cea_db_collection_size(cta) < 3) + return 0; + + /* + * Sinks that include the HF-EEODB in their E-EDID shall include one and + * only one instance of the HF-EEODB in the E-EDID, occupying bytes 4 + * through 6 of Block 1 of the E-EDID. + */ + if (!cea_db_is_hdmi_forum_eeodb(&cta[4])) + return 0; + + return cta[4 + 2]; +} + static void drm_parse_y420cmdb_bitmap(struct drm_connector *connector, const u8 *db) { -- 2.30.2
next prev parent reply other threads:[~2022-06-29 9:28 UTC|newest] Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-06-29 9:27 [CI RESEND 00/10] drm/edid: expand on struct drm_edid usage Jani Nikula 2022-06-29 9:27 ` [Intel-gfx] " Jani Nikula 2022-06-29 9:27 ` [CI RESEND 01/10] drm/edid: move drm_connector_update_edid_property() to drm_edid.c Jani Nikula 2022-06-29 9:27 ` [Intel-gfx] " Jani Nikula 2022-06-29 9:27 ` [CI RESEND 02/10] drm/edid: convert drm_connector_update_edid_property() to struct drm_edid Jani Nikula 2022-06-29 9:27 ` [Intel-gfx] " Jani Nikula 2022-06-29 9:27 ` [CI RESEND 03/10] drm/edid: clean up connector update error handling and debug logging Jani Nikula 2022-06-29 9:27 ` [Intel-gfx] " Jani Nikula 2022-06-29 9:27 ` [CI RESEND 04/10] drm/edid: abstract debugfs override EDID set/reset Jani Nikula 2022-06-29 9:27 ` [Intel-gfx] " Jani Nikula 2022-06-29 9:27 ` [CI RESEND 05/10] drm/edid: add drm_edid_connector_update() Jani Nikula 2022-06-29 9:27 ` [Intel-gfx] " Jani Nikula 2022-06-29 9:27 ` [CI RESEND 06/10] drm/probe-helper: add drm_connector_helper_get_modes() Jani Nikula 2022-06-29 9:27 ` [Intel-gfx] " Jani Nikula 2022-06-29 9:27 ` [CI RESEND 07/10] drm/edid: add drm_edid_raw() to access the raw EDID data Jani Nikula 2022-06-29 9:27 ` [Intel-gfx] " Jani Nikula 2022-06-29 9:27 ` [CI RESEND 08/10] drm/edid: do invalid block filtering in-place Jani Nikula 2022-06-29 9:27 ` [Intel-gfx] " Jani Nikula 2022-06-29 9:27 ` Jani Nikula [this message] 2022-06-29 9:27 ` [Intel-gfx] [CI RESEND 09/10] drm/edid: add HF-EEODB support to EDID read and allocation Jani Nikula 2022-06-29 9:27 ` [CI RESEND 10/10] drm/edid: take HF-EEODB extension count into account Jani Nikula 2022-06-29 9:27 ` [Intel-gfx] " Jani Nikula 2022-06-29 11:27 ` [Intel-gfx] ✗ Fi.CI.SPARSE: warning for drm/edid: expand on struct drm_edid usage (rev8) Patchwork 2022-06-29 11:55 ` [Intel-gfx] ✓ Fi.CI.BAT: success " Patchwork 2022-06-30 3:55 ` [Intel-gfx] ✗ Fi.CI.IGT: failure " Patchwork 2022-06-30 9:55 ` [CI RESEND 00/10] drm/edid: expand on struct drm_edid usage Jani Nikula 2022-06-30 9:55 ` [Intel-gfx] " Jani Nikula
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=57b57a355d62eb91ad1e3cf555978576f2bd9fdd.1656494768.git.jani.nikula@intel.com \ --to=jani.nikula@intel.com \ --cc=dri-devel@lists.freedesktop.org \ --cc=intel-gfx@lists.freedesktop.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.