On Wed, Oct 26, 2016 at 05:50:08PM +0300, Imre Deak wrote:
> 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.
>
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
> ---
> drivers/gpu/drm/drm_dp_dual_mode_helper.c | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_dp_dual_mode_helper.c b/drivers/gpu/drm/drm_dp_dual_mode_helper.c
> index 488355b..a0e603b 100644
> --- a/drivers/gpu/drm/drm_dp_dual_mode_helper.c
> +++ b/drivers/gpu/drm/drm_dp_dual_mode_helper.c
> @@ -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);
What does that %*pE print with size==0, nothing?
> 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 +228,10 @@ enum drm_dp_dual_mode_type drm_dp_dual_mode_detect(struct i2c_adapter *adapter)
> else
> return DRM_DP_DUAL_MODE_TYPE2_DVI;
> }
> + if (!is_type1_adaptor(adaptor_id) && adaptor_id != hdmi_id[0])
^^^^^^^^^^^^^^^^^^^^^^^^
I take it that was to account for the broken adaptors that ignore the
offset?
> + DRM_ERROR("Unexpected DP dual mode adapter ID %02x\n",
> + adaptor_id);
s/adapter/adaptor/ since that's what the spec called it, and I continued
down the same path to not confuse it the the i2c adapter.
With that
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> +
> }
>
> if (is_hdmi_adaptor(hdmi_id))
> --
> 2.5.0
--
Ville Syrjälä
Intel OTC
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