diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/drm_edid.c | 38 |
1 files changed, 37 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 3d6abde8e785..30b286ba16c4 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -685,6 +685,33 @@ EXPORT_SYMBOL(drm_mode_find_dmt); typedef void detailed_cb(struct detailed_timing *timing, void *closure); static void +cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure) +{ + int i, n = 0; + u8 rev = ext[0x01], d = ext[0x02]; + u8 *det_base = ext + d; + + switch (rev) { + case 0: + /* can't happen */ + return; + case 1: + /* have to infer how many blocks we have, check pixel clock */ + for (i = 0; i < 6; i++) + if (det_base[18*i] || det_base[18*i+1]) + n++; + break; + default: + /* explicit count */ + n = min(ext[0x03] & 0x0f, 6); + break; + } + + for (i = 0; i < n; i++) + cb((struct detailed_timing *)(det_base + 18 * i), closure); +} + +static void drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure) { int i; @@ -696,7 +723,16 @@ drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure) for (i = 0; i < EDID_DETAILED_TIMINGS; i++) cb(&(edid->detailed_timings[i]), closure); - /* XXX extension block walk */ + for (i = 1; i <= raw_edid[0x7e]; i++) { + u8 *ext = raw_edid + (i * EDID_LENGTH); + switch (*ext) { + case CEA_EXT: + cea_for_each_detailed_block(ext, cb, closure); + break; + default: + break; + } + } } static void |