Re: [PATCH v6] drm/i915: Init lspcon after HPD in intel_dp_detect()

From: Kai-Heng Feng
Date: Mon Sep 28 2020 - 05:12:24 EST

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Hi Jani,

> On Jul 10, 2020, at 23:48, Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> wrote:
>
>
>
>> On Jun 30, 2020, at 16:37, Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> wrote:
>>
>>
>>> On Jun 10, 2020, at 15:55, Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx>
>>
>> A gentle ping...
>
> Another gentle ping...

Can you please help reviewing this? Thanks!

Kai-Heng

>
>>
>>> ---
>>> 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

Next message: Chao Yu: "[PATCH] f2fs: fix to check segment boundary during SIT page readahead"
Previous message: Andy Shevchenko: "Re: [PATCH 8/9] gpio: mockup: use the generic 'gpio-line-names' property"
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