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SubjectRe: [PATCH v4] drm/i915: Init lspcon after HPD in intel_dp_detect()
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> On Feb 15, 2020, at 01:56, Kai-Heng Feng <kai.heng.feng@canonical.com> wrote:
>
> On HP 800 G4 DM, if HDMI cable isn't plugged before boot, the HDMI port
> becomes useless and never responds to cable hotplugging:
> [ 3.031904] [drm:lspcon_init [i915]] *ERROR* Failed to probe lspcon
> [ 3.031945] [drm:intel_ddi_init [i915]] *ERROR* LSPCON init failed on port D
>
> Seems like the lspcon chip on the system in question only gets powered
> after the cable is plugged.
>
> So let's call lspcon_init() dynamically to properly initialize the
> lspcon chip and make HDMI port work.
>
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>

A gentle ping.

> ---
> v4:
> - Trust VBT in intel_infoframe_init().
> - Init lspcon in intel_dp_detect().
>
> v3:
> - Make sure it's handled under long HPD case.
>
> v2:
> - Move lspcon_init() inside of intel_dp_hpd_pulse().
>
> drivers/gpu/drm/i915/display/intel_ddi.c | 17 +----------------
> drivers/gpu/drm/i915/display/intel_dp.c | 13 ++++++++++++-
> drivers/gpu/drm/i915/display/intel_hdmi.c | 2 +-
> 3 files changed, 14 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> index 33f1dc3d7c1a..ca717434b406 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -4741,7 +4741,7 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
> &dev_priv->vbt.ddi_port_info[port];
> struct intel_digital_port *intel_dig_port;
> struct intel_encoder *encoder;
> - bool init_hdmi, init_dp, init_lspcon = false;
> + bool init_hdmi, init_dp;
> enum phy phy = intel_port_to_phy(dev_priv, port);
>
> init_hdmi = port_info->supports_dvi || port_info->supports_hdmi;
> @@ -4754,7 +4754,6 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
> * is initialized before lspcon.
> */
> init_dp = true;
> - init_lspcon = true;
> init_hdmi = false;
> DRM_DEBUG_KMS("VBT says port %c has lspcon\n", port_name(port));
> }
> @@ -4833,20 +4832,6 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
> goto err;
> }
>
> - if (init_lspcon) {
> - if (lspcon_init(intel_dig_port))
> - /* TODO: handle hdmi info frame part */
> - DRM_DEBUG_KMS("LSPCON init success on port %c\n",
> - port_name(port));
> - else
> - /*
> - * LSPCON init faied, but DP init was success, so
> - * lets try to drive as DP++ port.
> - */
> - DRM_ERROR("LSPCON init failed on port %c\n",
> - port_name(port));
> - }
> -
> intel_infoframe_init(intel_dig_port);
>
> return;
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index c7424e2a04a3..43117aa86292 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -5663,8 +5663,19 @@ intel_dp_detect(struct drm_connector *connector,
> /* Can't disconnect eDP */
> if (intel_dp_is_edp(intel_dp))
> status = edp_detect(intel_dp);
> - else if (intel_digital_port_connected(encoder))
> + else if (intel_digital_port_connected(encoder)) {
> + if (intel_bios_is_lspcon_present(dev_priv, dig_port->base.port) &&
> + !dig_port->lspcon.active) {
> + if (lspcon_init(dig_port))
> + DRM_DEBUG_KMS("LSPCON init success on port %c\n",
> + port_name(dig_port->base.port));
> + else
> + DRM_DEBUG_KMS("LSPCON init failed on port %c\n",
> + port_name(dig_port->base.port));
> + }
> +
> status = intel_dp_detect_dpcd(intel_dp);
> + }
> else
> status = connector_status_disconnected;
>
> diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
> index 93ac0f296852..27a5aa8cefc9 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
> @@ -3100,7 +3100,7 @@ void intel_infoframe_init(struct intel_digital_port *intel_dig_port)
> intel_dig_port->set_infoframes = g4x_set_infoframes;
> intel_dig_port->infoframes_enabled = g4x_infoframes_enabled;
> } else if (HAS_DDI(dev_priv)) {
> - if (intel_dig_port->lspcon.active) {
> + if (intel_bios_is_lspcon_present(dev_priv, intel_dig_port->base.port)) {
> intel_dig_port->write_infoframe = lspcon_write_infoframe;
> intel_dig_port->read_infoframe = lspcon_read_infoframe;
> intel_dig_port->set_infoframes = lspcon_set_infoframes;
> --
> 2.17.1
>

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