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SubjectRe: [PATCH v3] drm/i915: Re-init lspcon after HPD if lspcon probe failed
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Hi Jani,

> On Dec 24, 2019, at 16:42, 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.

Do you have any further suggestion for this patch?

Kai-Heng

>
> Closes: https://gitlab.freedesktop.org/drm/intel/issues/203
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> ---
> 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_dp.c | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index fe31bbfd6c62..a72c9c041c60 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -6573,6 +6573,7 @@ enum irqreturn
> intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
> {
> struct intel_dp *intel_dp = &intel_dig_port->dp;
> + struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
>
> if (long_hpd && intel_dig_port->base.type == INTEL_OUTPUT_EDP) {
> /*
> @@ -6593,7 +6594,12 @@ intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
> long_hpd ? "long" : "short");
>
> if (long_hpd) {
> - intel_dp->reset_link_params = true;
> + if (intel_dig_port->base.type == INTEL_OUTPUT_DDI &&
> + HAS_LSPCON(dev_priv) && !intel_dig_port->lspcon.active)
> + lspcon_init(intel_dig_port);
> + else
> + intel_dp->reset_link_params = true;
> +
> return IRQ_NONE;
> }
>
> --
> 2.17.1
>

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