From: Tomas Bzatek tomas@bzatek.net
This will iterate over all DisplayID blocks found in the buffer. Previously only the first block was parsed.
https://bugs.freedesktop.org/show_bug.cgi?id=95207
Signed-off-by: Dave Airlie airlied@redhat.com --- drivers/gpu/drm/drm_edid.c | 124 ++++++++++++++++++++++++--------------------- 1 file changed, 65 insertions(+), 59 deletions(-)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index c8a3a55..1a364b3 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -4182,66 +4182,72 @@ static int drm_parse_display_id(struct drm_connector *connector, return -EINVAL; }
- block = (struct displayid_block *)&displayid[idx + 4]; - DRM_DEBUG_KMS("block id 0x%x, rev %d, len %d\n", - block->tag, block->rev, block->num_bytes); - - switch (block->tag) { - case DATA_BLOCK_TILED_DISPLAY: { - struct displayid_tiled_block *tile = (struct displayid_tiled_block *)block; - - u16 w, h; - u8 tile_v_loc, tile_h_loc; - u8 num_v_tile, num_h_tile; - struct drm_tile_group *tg; - - w = tile->tile_size[0] | tile->tile_size[1] << 8; - h = tile->tile_size[2] | tile->tile_size[3] << 8; - - num_v_tile = (tile->topo[0] & 0xf) | (tile->topo[2] & 0x30); - num_h_tile = (tile->topo[0] >> 4) | ((tile->topo[2] >> 2) & 0x30); - tile_v_loc = (tile->topo[1] & 0xf) | ((tile->topo[2] & 0x3) << 4); - tile_h_loc = (tile->topo[1] >> 4) | (((tile->topo[2] >> 2) & 0x3) << 4); - - connector->has_tile = true; - if (tile->tile_cap & 0x80) - connector->tile_is_single_monitor = true; - - connector->num_h_tile = num_h_tile + 1; - connector->num_v_tile = num_v_tile + 1; - connector->tile_h_loc = tile_h_loc; - connector->tile_v_loc = tile_v_loc; - connector->tile_h_size = w + 1; - connector->tile_v_size = h + 1; - - DRM_DEBUG_KMS("tile cap 0x%x\n", tile->tile_cap); - DRM_DEBUG_KMS("tile_size %d x %d\n", w + 1, h + 1); - DRM_DEBUG_KMS("topo num tiles %dx%d, location %dx%d\n", - num_h_tile + 1, num_v_tile + 1, tile_h_loc, tile_v_loc); - DRM_DEBUG_KMS("vend %c%c%c\n", tile->topology_id[0], tile->topology_id[1], tile->topology_id[2]); - - tg = drm_mode_get_tile_group(connector->dev, tile->topology_id); - if (!tg) { - tg = drm_mode_create_tile_group(connector->dev, tile->topology_id); - } - if (!tg) - return -ENOMEM; - - if (connector->tile_group != tg) { - /* if we haven't got a pointer, - take the reference, drop ref to old tile group */ - if (connector->tile_group) { - drm_mode_put_tile_group(connector->dev, connector->tile_group); + idx += sizeof(struct displayid_hdr); + while (block = (struct displayid_block *)&displayid[idx], + idx + sizeof(struct displayid_block) <= length && + idx + sizeof(struct displayid_block) + block->num_bytes <= length && + block->num_bytes > 0) { + idx += block->num_bytes + sizeof(struct displayid_block); + DRM_DEBUG_KMS("block id 0x%x, rev %d, len %d\n", + block->tag, block->rev, block->num_bytes); + + switch (block->tag) { + case DATA_BLOCK_TILED_DISPLAY: { + struct displayid_tiled_block *tile = (struct displayid_tiled_block *)block; + + u16 w, h; + u8 tile_v_loc, tile_h_loc; + u8 num_v_tile, num_h_tile; + struct drm_tile_group *tg; + + w = tile->tile_size[0] | tile->tile_size[1] << 8; + h = tile->tile_size[2] | tile->tile_size[3] << 8; + + num_v_tile = (tile->topo[0] & 0xf) | (tile->topo[2] & 0x30); + num_h_tile = (tile->topo[0] >> 4) | ((tile->topo[2] >> 2) & 0x30); + tile_v_loc = (tile->topo[1] & 0xf) | ((tile->topo[2] & 0x3) << 4); + tile_h_loc = (tile->topo[1] >> 4) | (((tile->topo[2] >> 2) & 0x3) << 4); + + connector->has_tile = true; + if (tile->tile_cap & 0x80) + connector->tile_is_single_monitor = true; + + connector->num_h_tile = num_h_tile + 1; + connector->num_v_tile = num_v_tile + 1; + connector->tile_h_loc = tile_h_loc; + connector->tile_v_loc = tile_v_loc; + connector->tile_h_size = w + 1; + connector->tile_v_size = h + 1; + + DRM_DEBUG_KMS("tile cap 0x%x\n", tile->tile_cap); + DRM_DEBUG_KMS("tile_size %d x %d\n", w + 1, h + 1); + DRM_DEBUG_KMS("topo num tiles %dx%d, location %dx%d\n", + num_h_tile + 1, num_v_tile + 1, tile_h_loc, tile_v_loc); + DRM_DEBUG_KMS("vend %c%c%c\n", tile->topology_id[0], tile->topology_id[1], tile->topology_id[2]); + + tg = drm_mode_get_tile_group(connector->dev, tile->topology_id); + if (!tg) { + tg = drm_mode_create_tile_group(connector->dev, tile->topology_id); } - connector->tile_group = tg; - } else - /* if same tile group, then release the ref we just took. */ - drm_mode_put_tile_group(connector->dev, tg); - } - break; - default: - printk("unknown displayid tag %d\n", block->tag); - break; + if (!tg) + return -ENOMEM; + + if (connector->tile_group != tg) { + /* if we haven't got a pointer, + take the reference, drop ref to old tile group */ + if (connector->tile_group) { + drm_mode_put_tile_group(connector->dev, connector->tile_group); + } + connector->tile_group = tg; + } else + /* if same tile group, then release the ref we just took. */ + drm_mode_put_tile_group(connector->dev, tg); + } + break; + default: + DRM_DEBUG_KMS("found DisplayID tag 0x%x, unhandled\n", block->tag); + break; + } } return 0; }