On Fri, Nov 27, 2020 at 08:52:29PM -0800, Lucas De Marchi wrote:
> On Fri, Nov 27, 2020 at 02:57:48PM +0000, Chris Wilson wrote:
> >We now use ilk_hpd_irq_setup for all GMCH platforms that do not have
> >hotplug. These are early gen3 and gen2 devices that now explode on boot
> >as they try to access non-existent registers.
>
> humn... true, my bad. But I don't think a revert is the right fix. It
> would be much better if we would not be setting up the hpd setup
> function at all for platforms that do not have hotplug. I think a
> separate early check for I915_HAS_HOTPLUG() would be deserved.
I think it generally leads to much less convoluted logic when we keep
gmch vs. rest separate. So I'm confused as to what we're even trying
to achieve here?
>
> Lucas De Marchi
>
> >
> >Fixes: 794d61a19090 ("drm/i915: re-order if/else ladder for hpd_irq_setup")
> >Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
> >Cc: Lucas De Marchi <lucas.demar...@intel.com>
> >Cc: José Roberto de Souza <jose.so...@intel.com>
> >Cc: Jani Nikula <jani.nik...@linux.intel.com>
>
>
> >---
> > drivers/gpu/drm/i915/i915_irq.c | 27 +++++++++++++++------------
> > 1 file changed, 15 insertions(+), 12 deletions(-)
> >
> >diff --git a/drivers/gpu/drm/i915/i915_irq.c
> >b/drivers/gpu/drm/i915/i915_irq.c
> >index dc6febc63f1c..c80eeac53952 100644
> >--- a/drivers/gpu/drm/i915/i915_irq.c
> >+++ b/drivers/gpu/drm/i915/i915_irq.c
> >@@ -4242,18 +4242,21 @@ void intel_irq_init(struct drm_i915_private
> >*dev_priv)
> > */
> > dev_priv->hotplug.hpd_short_storm_enabled = !HAS_DP_MST(dev_priv);
> >
> >- if (HAS_PCH_DG1(dev_priv))
> >- dev_priv->display.hpd_irq_setup = dg1_hpd_irq_setup;
> >- else if (INTEL_GEN(dev_priv) >= 11)
> >- dev_priv->display.hpd_irq_setup = gen11_hpd_irq_setup;
> >- else if (IS_GEN9_LP(dev_priv))
> >- dev_priv->display.hpd_irq_setup = bxt_hpd_irq_setup;
> >- else if (INTEL_PCH_TYPE(dev_priv) >= PCH_SPT)
> >- dev_priv->display.hpd_irq_setup = spt_hpd_irq_setup;
> >- else if (HAS_GMCH(dev_priv) && I915_HAS_HOTPLUG(dev_priv))
> >- dev_priv->display.hpd_irq_setup = i915_hpd_irq_setup;
> >- else
> >- dev_priv->display.hpd_irq_setup = ilk_hpd_irq_setup;
> >+ if (HAS_GMCH(dev_priv)) {
> >+ if (I915_HAS_HOTPLUG(dev_priv))
> >+ dev_priv->display.hpd_irq_setup = i915_hpd_irq_setup;
> >+ } else {
> >+ if (HAS_PCH_DG1(dev_priv))
> >+ dev_priv->display.hpd_irq_setup = dg1_hpd_irq_setup;
> >+ else if (INTEL_GEN(dev_priv) >= 11)
> >+ dev_priv->display.hpd_irq_setup = gen11_hpd_irq_setup;
> >+ else if (IS_GEN9_LP(dev_priv))
> >+ dev_priv->display.hpd_irq_setup = bxt_hpd_irq_setup;
> >+ else if (INTEL_PCH_TYPE(dev_priv) >= PCH_SPT)
> >+ dev_priv->display.hpd_irq_setup = spt_hpd_irq_setup;
> >+ else
> >+ dev_priv->display.hpd_irq_setup = ilk_hpd_irq_setup;
> >+ }
> > }
> >
> > /**
> >--
> >2.20.1
> >
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--
Ville Syrjälä
Intel
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