On Wed, Aug 17, 2016 at 01:49:49PM +0300, Mika Kahola wrote:
> Respect max TMDS clock frequency from DPCD for active
> DP to HDMI adapters.
>
> Signed-off-by: Mika Kahola <mika.kahola@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_drv.h | 3 +++
> drivers/gpu/drm/i915/intel_hdmi.c | 27 +++++++++++++++++++++++++++
> 2 files changed, 30 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 1c700b0..b7fd551 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -817,6 +817,9 @@ struct intel_hdmi {
> i915_reg_t hdmi_reg;
> int ddc_bus;
> struct {
> + int max_tmds_clock;
> + } dp_to_hdmi;
> + struct {
> enum drm_dp_dual_mode_type type;
> int max_tmds_clock;
> } dp_dual_mode;
> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> index 4df9f38..1469d00 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -1204,6 +1204,9 @@ static int hdmi_port_clock_limit(struct intel_hdmi *hdmi,
> int max_tmds_clock = intel_hdmi_source_max_tmds_clock(to_i915(dev));
>
> if (respect_downstream_limits) {
> + if (hdmi->dp_to_hdmi.max_tmds_clock)
> + max_tmds_clock = min(max_tmds_clock,
> + hdmi->dp_to_hdmi.max_tmds_clock);
> if (hdmi->dp_dual_mode.max_tmds_clock)
> max_tmds_clock = min(max_tmds_clock,
> hdmi->dp_dual_mode.max_tmds_clock);
> @@ -1373,11 +1376,33 @@ intel_hdmi_unset_edid(struct drm_connector *connector)
> intel_hdmi->dp_dual_mode.type = DRM_DP_DUAL_MODE_NONE;
> intel_hdmi->dp_dual_mode.max_tmds_clock = 0;
>
> + intel_hdmi->dp_to_hdmi.max_tmds_clock = 0;
> +
> kfree(to_intel_connector(connector)->detect_edid);
> to_intel_connector(connector)->detect_edid = NULL;
> }
>
> static void
> +intel_hdmi_dp_adapter_detect(struct drm_connector *connector)
> +{
> + struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
> + struct intel_digital_port *intel_dig_port =
> + hdmi_to_dig_port(intel_hdmi);
> + struct intel_dp *intel_dp = &intel_dig_port->dp;
> + int type = intel_dp->downstream_ports[0] & DP_DS_PORT_TYPE_MASK;
> +
> + if (type != DP_DS_PORT_TYPE_HDMI)
> + return;
> +
> + intel_hdmi->dp_to_hdmi.max_tmds_clock =
> + drm_dp_downstream_max_clock(intel_dp->dpcd,
> + intel_dp->downstream_ports);
Poets driven by intel_hdmi don't have DPCD, so I don't know what this
is supposed to achieve.
> +
> + DRM_DEBUG_KMS("DP HDMI adaptor detected (max TMDS clock : %d kHz\n",
> + intel_hdmi->dp_to_hdmi.max_tmds_clock);
> +}
> +
> +static void
> intel_hdmi_dp_dual_mode_detect(struct drm_connector *connector, bool has_edid)
> {
> struct drm_i915_private *dev_priv = to_i915(connector->dev);
> @@ -1438,6 +1463,8 @@ intel_hdmi_set_edid(struct drm_connector *connector, bool force)
>
> intel_hdmi_dp_dual_mode_detect(connector, edid != NULL);
>
> + intel_hdmi_dp_adapter_detect(connector);
> +
> intel_display_power_put(dev_priv, POWER_DOMAIN_GMBUS);
> }
>
> --
> 1.9.1
--
Ville Syrjälä
Intel OTC
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