HDMI 1.4 adds 4 "4k x 2k" modes in the the CEA vendor specific block.
With this commit, we now parse this block and expose the 4k modes that we find there. Signed-off-by: Damien Lespiau <damien.lespiau at intel.com> Tested-by: Cancan Feng <cancan.feng at intel.com> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=67030 --- drivers/gpu/drm/drm_edid.c | 115 +++++++++++++++++++++++++++++++++++++++------ 1 file changed, 100 insertions(+), 15 deletions(-) diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 51342c4..b43d64f 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -931,6 +931,36 @@ static const struct drm_display_mode edid_cea_modes[] = { .vrefresh = 100, }, }; +/* + * HDMI 1.4 4k modes. + */ +static const struct drm_display_mode edid_4k_modes[] = { + /* 1 - 3840x2160 at 30Hz */ + { DRM_MODE("3840x2160", DRM_MODE_TYPE_DRIVER, 297000, + 3840, 4016, 4104, 4400, 0, + 2160, 2168, 2178, 2250, 0, + DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC), + .vrefresh = 30, }, + /* 2 - 3840x2160 at 25Hz */ + { DRM_MODE("3840x2160", DRM_MODE_TYPE_DRIVER, 297000, + 3840, 4896, 4984, 5280, 0, + 2160, 2168, 2178, 2250, 0, + DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC), + .vrefresh = 25, }, + /* 3 - 3840x2160 at 24Hz */ + { DRM_MODE("3840x2160", DRM_MODE_TYPE_DRIVER, 297000, + 3840, 5116, 5204, 5500, 0, + 2160, 2168, 2178, 2250, 0, + DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC), + .vrefresh = 24, }, + /* 4 - 4096x2160 at 24Hz (SMPTE) */ + { DRM_MODE("3840x2160", DRM_MODE_TYPE_DRIVER, 297000, + 4096, 5116, 5204, 5500, 0, + 2160, 2168, 2178, 2250, 0, + DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC), + .vrefresh = 24, }, +}; + /*** DDC fetch and block validation ***/ static const u8 edid_header[] = { @@ -2465,6 +2495,59 @@ do_cea_modes(struct drm_connector *connector, u8 *db, u8 len) return modes; } +static int do_hdmi_vsdb_modes(struct drm_connector *connector, u8 *db, u8 len) +{ + struct drm_device *dev = connector->dev; + int modes = 0, offset = 0, i; + u8 vic_len; + + if (len < 8) + goto out; + + /* no HDMI_Video_Present */ + if (!(db[8] & (1 << 5))) + goto out; + + /* Latency_Fields_Present */ + if (db[8] & (1 << 7)) + offset += 2; + + /* I_Latency_Fields_Present */ + if (db[8] & (1 << 6)) + offset += 2; + + /* the declared length is not long enough for the 2 first bytes + * of additional video format capabilities */ + if (len < (10 + offset)) + goto out; + + vic_len = db[10 + offset] >> 5; + offset += 2; + + for (i = 0; i < vic_len && len >= (9 + offset + i); i++) { + struct drm_display_mode *newmode; + u8 vic; + + vic = db[9 + offset + i]; + + vic--; /* VICs start at 1 */ + if (vic >= ARRAY_SIZE(edid_4k_modes)) { + DRM_ERROR("Unknow HDMI VIC: %d\n", vic); + continue; + } + + newmode = drm_mode_duplicate(dev, &edid_4k_modes[vic]); + if (!newmode) + continue; + + drm_mode_probed_add(connector, newmode); + modes++; + } + +out: + return modes; +} + static int cea_db_payload_len(const u8 *db) { @@ -2496,6 +2579,21 @@ cea_db_offsets(const u8 *cea, int *start, int *end) return 0; } +static bool cea_db_is_hdmi_vsdb(const u8 *db) +{ + int hdmi_id; + + if (cea_db_tag(db) != VENDOR_BLOCK) + return false; + + if (cea_db_payload_len(db) < 5) + return false; + + hdmi_id = db[1] | (db[2] << 8) | (db[3] << 16); + + return hdmi_id == HDMI_IDENTIFIER; +} + #define for_each_cea_db(cea, i, start, end) \ for ((i) = (start); (i) < (end) && (i) + cea_db_payload_len(&(cea)[(i)]) < (end); (i) += cea_db_payload_len(&(cea)[(i)]) + 1) @@ -2518,6 +2616,8 @@ add_cea_modes(struct drm_connector *connector, struct edid *edid) if (cea_db_tag(db) == VIDEO_BLOCK) modes += do_cea_modes(connector, db + 1, dbl); + else if (cea_db_is_hdmi_vsdb(db)) + modes += do_hdmi_vsdb_modes(connector, db, dbl); } } @@ -2570,21 +2670,6 @@ monitor_name(struct detailed_timing *t, void *data) *(u8 **)data = t->data.other_data.data.str.str; } -static bool cea_db_is_hdmi_vsdb(const u8 *db) -{ - int hdmi_id; - - if (cea_db_tag(db) != VENDOR_BLOCK) - return false; - - if (cea_db_payload_len(db) < 5) - return false; - - hdmi_id = db[1] | (db[2] << 8) | (db[3] << 16); - - return hdmi_id == HDMI_IDENTIFIER; -} - /** * drm_edid_to_eld - build ELD from EDID * @connector: connector corresponding to the HDMI/DP sink -- 1.8.3.1
