> On Jun 10, 2020, at 15:55, Kai-Heng Feng <kai.heng.feng at 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 only gets powered after the
> cable is plugged.
>
> Consilidate lspcon_init() into lspcon_resume() to dynamically init
> lspcon chip, and make HDMI port work.
>
> Signed-off-by: Kai-Heng Feng <kai.heng.feng at canonical.com>
A gentle ping...
> ---
> v6:
> - Rebase on latest for-linux-next.
>
> v5:
> - Consolidate lspcon_resume() with lspcon_init().
> - Move more logic into lspcon code.
>
> 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 | 19 +------
> drivers/gpu/drm/i915/display/intel_dp.c | 10 ++--
> drivers/gpu/drm/i915/display/intel_hdmi.c | 3 +-
> drivers/gpu/drm/i915/display/intel_lspcon.c | 63 ++++++++++++---------
> drivers/gpu/drm/i915/display/intel_lspcon.h | 3 +-
> 5 files changed, 43 insertions(+), 55 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> index aa22465bb56e..af755b1aa24b 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -4805,7 +4805,7 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port 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 = intel_bios_port_supports_dvi(dev_priv, port) ||
> @@ -4819,7 +4819,6 @@ 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_dbg_kms(&dev_priv->drm, "VBT says port %c has lspcon\n",
> port_name(port));
> @@ -4904,22 +4903,6 @@ 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_dbg_kms(&dev_priv->drm,
> - "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_err(&dev_priv->drm,
> - "LSPCON init failed on port %c\n",
> - port_name(port));
> - }
> -
> if (INTEL_GEN(dev_priv) >= 11) {
> if (intel_phy_is_tc(dev_priv, phy))
> intel_dig_port->connected = intel_tc_port_connected;
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index ed9e53c373a7..398a104158a8 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -5962,15 +5962,14 @@ static enum drm_connector_status
> intel_dp_detect_dpcd(struct intel_dp *intel_dp)
> {
> struct drm_i915_private *i915 = dp_to_i915(intel_dp);
> - struct intel_lspcon *lspcon = dp_to_lspcon(intel_dp);
> + struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> u8 *dpcd = intel_dp->dpcd;
> u8 type;
>
> if (WARN_ON(intel_dp_is_edp(intel_dp)))
> return connector_status_connected;
>
> - if (lspcon->active)
> - lspcon_resume(lspcon);
> + lspcon_resume(dig_port);
>
> if (!intel_dp_get_dpcd(intel_dp))
> return connector_status_disconnected;
> @@ -7056,14 +7055,13 @@ void intel_dp_encoder_reset(struct drm_encoder *encoder)
> {
> struct drm_i915_private *dev_priv = to_i915(encoder->dev);
> struct intel_dp *intel_dp = enc_to_intel_dp(to_intel_encoder(encoder));
> - struct intel_lspcon *lspcon = dp_to_lspcon(intel_dp);
> + struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> intel_wakeref_t wakeref;
>
> if (!HAS_DDI(dev_priv))
> intel_dp->DP = intel_de_read(dev_priv, intel_dp->output_reg);
>
> - if (lspcon->active)
> - lspcon_resume(lspcon);
> + lspcon_resume(dig_port);
>
> intel_dp->reset_link_params = true;
>
> diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
> index 010f37240710..643ad2127931 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
> @@ -3155,7 +3155,8 @@ 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;
> diff --git a/drivers/gpu/drm/i915/display/intel_lspcon.c b/drivers/gpu/drm/i915/display/intel_lspcon.c
> index 6ff7b226f0a1..e3dde4c25604 100644
> --- a/drivers/gpu/drm/i915/display/intel_lspcon.c
> +++ b/drivers/gpu/drm/i915/display/intel_lspcon.c
> @@ -525,44 +525,17 @@ u32 lspcon_infoframes_enabled(struct intel_encoder *encoder,
> return 0;
> }
>
> -void lspcon_resume(struct intel_lspcon *lspcon)
> -{
> - enum drm_lspcon_mode expected_mode;
> -
> - if (lspcon_wake_native_aux_ch(lspcon)) {
> - expected_mode = DRM_LSPCON_MODE_PCON;
> - lspcon_resume_in_pcon_wa(lspcon);
> - } else {
> - expected_mode = DRM_LSPCON_MODE_LS;
> - }
> -
> - if (lspcon_wait_mode(lspcon, expected_mode) == DRM_LSPCON_MODE_PCON)
> - return;
> -
> - if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON))
> - DRM_ERROR("LSPCON resume failed\n");
> - else
> - DRM_DEBUG_KMS("LSPCON resume success\n");
> -}
> -
> void lspcon_wait_pcon_mode(struct intel_lspcon *lspcon)
> {
> lspcon_wait_mode(lspcon, DRM_LSPCON_MODE_PCON);
> }
>
> -bool lspcon_init(struct intel_digital_port *intel_dig_port)
> +static bool lspcon_init(struct intel_digital_port *intel_dig_port)
> {
> struct intel_dp *dp = &intel_dig_port->dp;
> struct intel_lspcon *lspcon = &intel_dig_port->lspcon;
> - struct drm_device *dev = intel_dig_port->base.base.dev;
> - struct drm_i915_private *dev_priv = to_i915(dev);
> struct drm_connector *connector = &dp->attached_connector->base;
>
> - if (!HAS_LSPCON(dev_priv)) {
> - DRM_ERROR("LSPCON is not supported on this platform\n");
> - return false;
> - }
> -
> lspcon->active = false;
> lspcon->mode = DRM_LSPCON_MODE_INVALID;
>
> @@ -586,3 +559,37 @@ bool lspcon_init(struct intel_digital_port *intel_dig_port)
> DRM_DEBUG_KMS("Success: LSPCON init\n");
> return true;
> }
> +
> +void lspcon_resume(struct intel_digital_port *intel_dig_port)
> +{
> + struct intel_lspcon *lspcon = &intel_dig_port->lspcon;
> + struct drm_device *dev = intel_dig_port->base.base.dev;
> + struct drm_i915_private *dev_priv = to_i915(dev);
> + enum drm_lspcon_mode expected_mode;
> +
> + if (!intel_bios_is_lspcon_present(dev_priv, intel_dig_port->base.port))
> + return;
> +
> + if (!lspcon->active) {
> + if (!lspcon_init(intel_dig_port)) {
> + DRM_ERROR("LSPCON init failed on port %c\n",
> + port_name(intel_dig_port->base.port));
> + return;
> + }
> + }
> +
> + if (lspcon_wake_native_aux_ch(lspcon)) {
> + expected_mode = DRM_LSPCON_MODE_PCON;
> + lspcon_resume_in_pcon_wa(lspcon);
> + } else {
> + expected_mode = DRM_LSPCON_MODE_LS;
> + }
> +
> + if (lspcon_wait_mode(lspcon, expected_mode) == DRM_LSPCON_MODE_PCON)
> + return;
> +
> + if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON))
> + DRM_ERROR("LSPCON resume failed\n");
> + else
> + DRM_DEBUG_KMS("LSPCON resume success\n");
> +}
> diff --git a/drivers/gpu/drm/i915/display/intel_lspcon.h b/drivers/gpu/drm/i915/display/intel_lspcon.h
> index 37cfddf8a9c5..169db35db13e 100644
> --- a/drivers/gpu/drm/i915/display/intel_lspcon.h
> +++ b/drivers/gpu/drm/i915/display/intel_lspcon.h
> @@ -15,8 +15,7 @@ struct intel_digital_port;
> struct intel_encoder;
> struct intel_lspcon;
>
> -bool lspcon_init(struct intel_digital_port *intel_dig_port);
> -void lspcon_resume(struct intel_lspcon *lspcon);
> +void lspcon_resume(struct intel_digital_port *intel_dig_port);
> void lspcon_wait_pcon_mode(struct intel_lspcon *lspcon);
> void lspcon_write_infoframe(struct intel_encoder *encoder,
> const struct intel_crtc_state *crtc_state,
> --
> 2.17.1
>