On Mon, Sep 01, 2014 at 05:02:51PM +1000, Dave Airlie wrote:
> > drm/i915: add DP 1.2 MST support (v0.7)
> >
> > This adds DP 1.2 MST support on Haswell systems.
> >
> I've attached a patch that might fix this, please test and let me know.
>
> Dave.
> From d407c946fbf5c48f30160591f5bd71fbe158aeb4 Mon Sep 17 00:00:00 2001
> From: Dave Airlie <airlied@xxxxxxxxxx>
> Date: Mon, 1 Sep 2014 16:58:12 +1000
> Subject: [PATCH] drm/i915: handle G45/GM45 pulse detection connected state.
>
> In the HPD pulse handler we check for long pulses if the port is actually
> connected, however we do that for IBX, but we use the pulse handling code on
> GM45 systems as well, so we need to use a diffent check.
>
> This patch refactors the digital port connected check out of the g4x detection
> path and reuses it in the hpd pulse path.
>
> Should fix:
> Message-ID: <1409382202.5141.36.camel@xxxxxxxxxxxxxxxxx>
>
> Reported-by: Mike Galbraith <umgwanakikbuti@xxxxxxxxx>
> Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_dp.c | 55 +++++++++++++++++++++++++++--------------
> 1 file changed, 37 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 67cfed6..81d7681 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -3661,24 +3661,12 @@ ironlake_dp_detect(struct intel_dp *intel_dp)
> return intel_dp_detect_dpcd(intel_dp);
> }
>
> -static enum drm_connector_status
> -g4x_dp_detect(struct intel_dp *intel_dp)
> +static int g4x_digital_port_connected(struct drm_device *dev,
> + struct intel_digital_port *intel_dig_port)
> {
> - struct drm_device *dev = intel_dp_to_dev(intel_dp);
> struct drm_i915_private *dev_priv = dev->dev_private;
> - struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
> uint32_t bit;
>
> - /* Can't disconnect eDP, but you can close the lid... */
> - if (is_edp(intel_dp)) {
> - enum drm_connector_status status;
> -
> - status = intel_panel_detect(dev);
> - if (status == connector_status_unknown)
> - status = connector_status_connected;
> - return status;
> - }
> -
> if (IS_VALLEYVIEW(dev)) {
> switch (intel_dig_port->port) {
> case PORT_B:
> @@ -3691,7 +3679,7 @@ g4x_dp_detect(struct intel_dp *intel_dp)
> bit = PORTD_HOTPLUG_LIVE_STATUS_VLV;
> break;
> default:
> - return connector_status_unknown;
> + return -EINVAL;
> }
> } else {
> switch (intel_dig_port->port) {
> @@ -3705,11 +3693,36 @@ g4x_dp_detect(struct intel_dp *intel_dp)
> bit = PORTD_HOTPLUG_LIVE_STATUS_G4X;
> break;
> default:
> - return connector_status_unknown;
> + return -EINVAL;
> }
> }
>
> if ((I915_READ(PORT_HOTPLUG_STAT) & bit) == 0)
> + return 0;
> + return 1;
> +}
> +
> +static enum drm_connector_status
> +g4x_dp_detect(struct intel_dp *intel_dp)
> +{
> + struct drm_device *dev = intel_dp_to_dev(intel_dp);
> + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
> + int ret;
> +
> + /* Can't disconnect eDP, but you can close the lid... */
> + if (is_edp(intel_dp)) {
> + enum drm_connector_status status;
> +
> + status = intel_panel_detect(dev);
> + if (status == connector_status_unknown)
> + status = connector_status_connected;
> + return status;
> + }
> +
> + ret = g4x_digital_port_connected(dev, intel_dig_port);
> + if (ret == -EINVAL)
> + return connector_status_unknown;
> + else if (ret == 0)
> return connector_status_disconnected;
>
> return intel_dp_detect_dpcd(intel_dp);
> @@ -4066,8 +4079,14 @@ intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
> intel_display_power_get(dev_priv, power_domain);
>
> if (long_hpd) {
> - if (!ibx_digital_port_connected(dev_priv, intel_dig_port))
> - goto mst_fail;
> +
> + if (HAS_PCH_SPLIT(dev)) {
> + if (!ibx_digital_port_connected(dev_priv, intel_dig_port))
> + goto mst_fail;
> + } else {
> + if (g4x_digital_port_connected(dev, intel_dig_port) != 1)
> + goto mst_fail;
> + }
>
> if (!intel_dp_get_dpcd(intel_dp)) {
> goto mst_fail;
> --
> 1.9.3
>
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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