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drm: Print some debug/error info during DP dual mode detect 

There's at least one LSPCON device that occasionally returns an unexpected
adaptor ID which leads to a failed detect. Print some debug info to help
debugging this and future cases. Also print an error for an unexpected
adaptor ID, so users can report it.

v2:
- s/adapter/adaptor/ and add code comment about incorrect type 1 adaptor
  IDs. (Ville)

Cc: dri-devel@lists.freedesktop.org
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1477499359-12001-1-git-send-email-imre.deak@intel.com
This commit is contained in:
Imre Deak 2016-10-26 19:29:19 +03:00 committed by Sean Paul
parent 329f4c812a
commit 9ff7a1b0ba
1 changed files with 18 additions and 0 deletions
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18
drivers/gpu/drm/drm_dp_dual_mode_helper.c
View File

@ -142,6 +142,11 @@ static bool is_hdmi_adaptor(const char hdmi_id[DP_DUAL_MODE_HDMI_ID_LEN])
sizeof(dp_dual_mode_hdmi_id)) == 0;
}
static bool is_type1_adaptor(uint8_t adaptor_id)
{
return adaptor_id == 0 || adaptor_id == 0xff;
}
static bool is_type2_adaptor(uint8_t adaptor_id)
{
return adaptor_id == (DP_DUAL_MODE_TYPE_TYPE2 |
@ -193,6 +198,8 @@ enum drm_dp_dual_mode_type drm_dp_dual_mode_detect(struct i2c_adapter *adapter)
*/
ret = drm_dp_dual_mode_read(adapter, DP_DUAL_MODE_HDMI_ID,
hdmi_id, sizeof(hdmi_id));
DRM_DEBUG_KMS("DP dual mode HDMI ID: %*pE (err %zd)\n",
ret ? 0 : (int)sizeof(hdmi_id), hdmi_id, ret);
if (ret)
return DRM_DP_DUAL_MODE_UNKNOWN;
@ -210,6 +217,8 @@ enum drm_dp_dual_mode_type drm_dp_dual_mode_detect(struct i2c_adapter *adapter)
*/
ret = drm_dp_dual_mode_read(adapter, DP_DUAL_MODE_ADAPTOR_ID,
&adaptor_id, sizeof(adaptor_id));
DRM_DEBUG_KMS("DP dual mode adaptor ID: %02x (err %zd)\n",
adaptor_id, ret);
if (ret == 0) {
if (is_lspcon_adaptor(hdmi_id, adaptor_id))
return DRM_DP_DUAL_MODE_LSPCON;
@ -219,6 +228,15 @@ enum drm_dp_dual_mode_type drm_dp_dual_mode_detect(struct i2c_adapter *adapter)
else
return DRM_DP_DUAL_MODE_TYPE2_DVI;
}
/*
* If neither a proper type 1 ID nor a broken type 1 adaptor
* as described above, assume type 1, but let the user know
* that we may have misdetected the type.
*/
if (!is_type1_adaptor(adaptor_id) && adaptor_id != hdmi_id[0])
DRM_ERROR("Unexpected DP dual mode adaptor ID %02x\n",
adaptor_id);
}
if (is_hdmi_adaptor(hdmi_id))