diff options
Diffstat (limited to 'drivers/gpu/drm/drm_edid.c')
| -rw-r--r-- | drivers/gpu/drm/drm_edid.c | 89 |
1 files changed, 79 insertions, 10 deletions
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 9c9463ec5465..7aa2a56a71c8 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -28,6 +28,7 @@ * DEALINGS IN THE SOFTWARE. */ +#include <linux/bitfield.h> #include <linux/hdmi.h> #include <linux/i2c.h> #include <linux/kernel.h> @@ -49,6 +50,11 @@ (((edid)->version > (maj)) || \ ((edid)->version == (maj) && (edid)->revision > (min))) +static int oui(u8 first, u8 second, u8 third) +{ + return (first << 16) | (second << 8) | third; +} + #define EDID_EST_TIMINGS 16 #define EDID_STD_TIMINGS 8 #define EDID_DETAILED_TIMINGS 4 @@ -4187,32 +4193,24 @@ cea_db_offsets(const u8 *cea, int *start, int *end) 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_IEEE_OUI; + return oui(db[3], db[2], db[1]) == HDMI_IEEE_OUI; } static bool cea_db_is_hdmi_forum_vsdb(const u8 *db) { - unsigned int oui; - if (cea_db_tag(db) != VENDOR_BLOCK) return false; if (cea_db_payload_len(db) < 7) return false; - oui = db[3] << 16 | db[2] << 8 | db[1]; - - return oui == HDMI_FORUM_IEEE_OUI; + return oui(db[3], db[2], db[1]) == HDMI_FORUM_IEEE_OUI; } static bool cea_db_is_vcdb(const u8 *db) @@ -5222,6 +5220,71 @@ void drm_get_monitor_range(struct drm_connector *connector, info->monitor_range.max_vfreq); } +static void drm_parse_vesa_mso_data(struct drm_connector *connector, + const struct displayid_block *block) +{ + struct displayid_vesa_vendor_specific_block *vesa = + (struct displayid_vesa_vendor_specific_block *)block; + struct drm_display_info *info = &connector->display_info; + + if (block->num_bytes < 3) { + drm_dbg_kms(connector->dev, "Unexpected vendor block size %u\n", + block->num_bytes); + return; + } + + if (oui(vesa->oui[0], vesa->oui[1], vesa->oui[2]) != VESA_IEEE_OUI) + return; + + if (sizeof(*vesa) != sizeof(*block) + block->num_bytes) { + drm_dbg_kms(connector->dev, "Unexpected VESA vendor block size\n"); + return; + } + + switch (FIELD_GET(DISPLAYID_VESA_MSO_MODE, vesa->mso)) { + default: + drm_dbg_kms(connector->dev, "Reserved MSO mode value\n"); + fallthrough; + case 0: + info->mso_stream_count = 0; + break; + case 1: + info->mso_stream_count = 2; /* 2 or 4 links */ + break; + case 2: + info->mso_stream_count = 4; /* 4 links */ + break; + } + + if (!info->mso_stream_count) { + info->mso_pixel_overlap = 0; + return; + } + + info->mso_pixel_overlap = FIELD_GET(DISPLAYID_VESA_MSO_OVERLAP, vesa->mso); + if (info->mso_pixel_overlap > 8) { + drm_dbg_kms(connector->dev, "Reserved MSO pixel overlap value %u\n", + info->mso_pixel_overlap); + info->mso_pixel_overlap = 8; + } + + drm_dbg_kms(connector->dev, "MSO stream count %u, pixel overlap %u\n", + info->mso_stream_count, info->mso_pixel_overlap); +} + +static void drm_update_mso(struct drm_connector *connector, const struct edid *edid) +{ + const struct displayid_block *block; + struct displayid_iter iter; + + displayid_iter_edid_begin(edid, &iter); + displayid_iter_for_each(block, &iter) { + if (block->tag == DATA_BLOCK_2_VENDOR_SPECIFIC) + drm_parse_vesa_mso_data(connector, block); + } + displayid_iter_end(&iter); +} + /* A connector has no EDID information, so we've got no EDID to compute quirks from. Reset * all of the values which would have been set from EDID */ @@ -5245,6 +5308,9 @@ drm_reset_display_info(struct drm_connector *connector) info->non_desktop = 0; memset(&info->monitor_range, 0, sizeof(info->monitor_range)); + + info->mso_stream_count = 0; + info->mso_pixel_overlap = 0; } u32 drm_add_display_info(struct drm_connector *connector, const struct edid *edid) @@ -5323,6 +5389,9 @@ u32 drm_add_display_info(struct drm_connector *connector, const struct edid *edi info->color_formats |= DRM_COLOR_FORMAT_YCRCB444; if (edid->features & DRM_EDID_FEATURE_RGB_YCRCB422) info->color_formats |= DRM_COLOR_FORMAT_YCRCB422; + + drm_update_mso(connector, edid); + return quirks; } |