diff options
Diffstat (limited to 'drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c index 5b096be44e59..01d04fa2419e 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c @@ -435,3 +435,50 @@ bool dm_helpers_submit_i2c( return result; } + +enum dc_edid_status dm_helpers_read_local_edid( + struct dc_context *ctx, + struct dc_link *link, + struct dc_sink *sink) +{ + struct amdgpu_connector *aconnector = link->priv; + struct i2c_adapter *ddc; + int retry = 3; + enum dc_edid_status edid_status; + struct edid *edid; + + if (link->aux_mode) + ddc = &aconnector->dm_dp_aux.aux.ddc; + else + ddc = &aconnector->i2c->base; + + /* some dongles read edid incorrectly the first time, + * do check sum and retry to make sure read correct edid. + */ + do { + + edid = drm_get_edid(&aconnector->base, ddc); + + if (!edid) + return EDID_NO_RESPONSE; + + sink->dc_edid.length = EDID_LENGTH * (edid->extensions + 1); + memmove(sink->dc_edid.raw_edid, (uint8_t *)edid, sink->dc_edid.length); + + /* We don't need the original edid anymore */ + kfree(edid); + + edid_status = dm_helpers_parse_edid_caps( + ctx, + &sink->dc_edid, + &sink->edid_caps); + + } while (edid_status == EDID_BAD_CHECKSUM && --retry > 0); + + if (edid_status != EDID_OK) + DRM_ERROR("EDID err: %d, on connector: %s", + edid_status, + aconnector->base.name); + + return edid_status; +} |