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SubjectRe: [PATCH] drm/i915: Re-init lspcon after HPD if lspcon probe failed
Date
On Mon, 23 Dec 2019, 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.
>
> Closes: https://gitlab.freedesktop.org/drm/intel/issues/203
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> ---
> drivers/gpu/drm/i915/display/intel_hotplug.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_hotplug.c b/drivers/gpu/drm/i915/display/intel_hotplug.c
> index fc29046d48ea..e2862e36d0bf 100644
> --- a/drivers/gpu/drm/i915/display/intel_hotplug.c
> +++ b/drivers/gpu/drm/i915/display/intel_hotplug.c
> @@ -28,6 +28,7 @@
> #include "i915_drv.h"
> #include "intel_display_types.h"
> #include "intel_hotplug.h"
> +#include "intel_lspcon.h"
>
> /**
> * DOC: Hotplug
> @@ -336,6 +337,8 @@ static void i915_digport_work_func(struct work_struct *work)
> continue;
>
> dig_port = enc_to_dig_port(&encoder->base);
> + if (HAS_LSPCON(dev_priv) && !dig_port->lspcon.active)
> + lspcon_init(dig_port);

The whole digport work function is platform and encoder agnostic, this
call has no place in here.

One alternative is intel_dp_hpd_pulse().


BR,
Jani.


>
> ret = dig_port->hpd_pulse(dig_port, long_hpd);
> if (ret == IRQ_NONE) {

--
Jani Nikula, Intel Open Source Graphics Center

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