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Message-ID: <a55af9a9f4454f07e34c984cc2ef0e31b38fcbf1.camel@redhat.com>
Date: Wed, 17 Feb 2021 16:19:29 -0500
From: Lyude Paul <lyude@...hat.com>
To: imre.deak@...el.com
Cc: intel-gfx@...ts.freedesktop.org,
Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@...el.com>,
Matt Roper <matthew.d.roper@...el.com>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
"open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] drm/i915/gen9bc: Handle TGP PCH during suspend/resume
On Wed, 2021-02-17 at 23:18 +0200, Imre Deak wrote:
> On Wed, Feb 17, 2021 at 01:00:16PM -0500, Lyude Paul wrote:
> > From: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@...el.com>
> >
> > For Legacy S3 suspend/resume GEN9 BC needs to enable and
> > setup TGP PCH.
> >
> > v2:
> > * Move Wa_14010685332 into it's own function - vsyrjala
> > * Add TODO comment about figuring out if we can move this workaround - imre
> > v3:
> > * Rename cnp_irq_post_reset() to cnp_display_clock_wa()
> > * Add TODO item mentioning we need to clarify which platforms this
> > workaround applies to
> > * Just use ibx_irq_reset() in gen8_irq_reset(). This code should be
> > functionally equivalent on gen9 bc to the code v2 added
> > * Drop icp_hpd_irq_setup() call in spt_hpd_irq_setup(), this looks to be
> > more or less identical to spt_hpd_irq_setup() minus additionally enabling
> > one port. Will update i915 to use icp_hpd_irq_setup() for ICP in a
> > separate patch.
> > v4:
> > * Revert Wa_14010685332 system list in comments to how it was before
> > * Add back HAS_PCH_SPLIT() check before calling ibx_irq_reset()
> >
> > Cc: Matt Roper <matthew.d.roper@...el.com>
> > Signed-off-by: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@...el.com>
> > Signed-off-by: Lyude Paul <lyude@...hat.com>
>
> Thanks, looks ok to me:
> Reviewed-by: Imre Deak <imre.deak@...el.com>
>
> nit: cnp_display_clock_gating_wa() would be an even better name, could
> be renamed while applying.
Sure thing. JFYI - I'm going to hold off on pushing this patch until I've got
confirmation from the OEMs this is for that these patches still fix their issues
(since I unfortunately don't have any access to this hardware).
>
> > ---
> > drivers/gpu/drm/i915/i915_irq.c | 49 +++++++++++++++++++++------------
> > 1 file changed, 32 insertions(+), 17 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_irq.c
> > b/drivers/gpu/drm/i915/i915_irq.c
> > index 98145a7f28a4..9b56a8f81e1a 100644
> > --- a/drivers/gpu/drm/i915/i915_irq.c
> > +++ b/drivers/gpu/drm/i915/i915_irq.c
> > @@ -3040,6 +3040,24 @@ static void valleyview_irq_reset(struct
> > drm_i915_private *dev_priv)
> > spin_unlock_irq(&dev_priv->irq_lock);
> > }
> >
> > +static void cnp_display_clock_wa(struct drm_i915_private *dev_priv)
> > +{
> > + struct intel_uncore *uncore = &dev_priv->uncore;
> > +
> > + /*
> > + * Wa_14010685332:cnp/cmp,tgp,adp
> > + * TODO: Clarify which platforms this applies to
> > + * TODO: Figure out if this workaround can be applied in the s0ix
> > suspend/resume handlers as
> > + * on earlier platforms and whether the workaround is also needed
> > for runtime suspend/resume
> > + */
> > + if (INTEL_PCH_TYPE(dev_priv) == PCH_CNP ||
> > + (INTEL_PCH_TYPE(dev_priv) >= PCH_TGP && INTEL_PCH_TYPE(dev_priv)
> > < PCH_DG1)) {
> > + intel_uncore_rmw(uncore, SOUTH_CHICKEN1,
> > SBCLK_RUN_REFCLK_DIS,
> > + SBCLK_RUN_REFCLK_DIS);
> > + intel_uncore_rmw(uncore, SOUTH_CHICKEN1,
> > SBCLK_RUN_REFCLK_DIS, 0);
> > + }
> > +}
> > +
> > static void gen8_irq_reset(struct drm_i915_private *dev_priv)
> > {
> > struct intel_uncore *uncore = &dev_priv->uncore;
> > @@ -3063,6 +3081,8 @@ static void gen8_irq_reset(struct drm_i915_private
> > *dev_priv)
> >
> > if (HAS_PCH_SPLIT(dev_priv))
> > ibx_irq_reset(dev_priv);
> > +
> > + cnp_display_clock_wa(dev_priv);
> > }
> >
> > static void gen11_display_irq_reset(struct drm_i915_private *dev_priv)
> > @@ -3104,15 +3124,7 @@ static void gen11_display_irq_reset(struct
> > drm_i915_private *dev_priv)
> > if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP)
> > GEN3_IRQ_RESET(uncore, SDE);
> >
> > - /* Wa_14010685332:cnp/cmp,tgp,adp */
> > - if (INTEL_PCH_TYPE(dev_priv) == PCH_CNP ||
> > - (INTEL_PCH_TYPE(dev_priv) >= PCH_TGP &&
> > - INTEL_PCH_TYPE(dev_priv) < PCH_DG1)) {
> > - intel_uncore_rmw(uncore, SOUTH_CHICKEN1,
> > - SBCLK_RUN_REFCLK_DIS,
> > SBCLK_RUN_REFCLK_DIS);
> > - intel_uncore_rmw(uncore, SOUTH_CHICKEN1,
> > - SBCLK_RUN_REFCLK_DIS, 0);
> > - }
> > + cnp_display_clock_wa(dev_priv);
> > }
> >
> > static void gen11_irq_reset(struct drm_i915_private *dev_priv)
> > @@ -3764,9 +3776,19 @@ static void gen8_de_irq_postinstall(struct
> > drm_i915_private *dev_priv)
> > }
> > }
> >
> > +static void icp_irq_postinstall(struct drm_i915_private *dev_priv)
> > +{
> > + struct intel_uncore *uncore = &dev_priv->uncore;
> > + u32 mask = SDE_GMBUS_ICP;
> > +
> > + GEN3_IRQ_INIT(uncore, SDE, ~mask, 0xffffffff);
> > +}
> > +
> > static void gen8_irq_postinstall(struct drm_i915_private *dev_priv)
> > {
> > - if (HAS_PCH_SPLIT(dev_priv))
> > + if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP)
> > + icp_irq_postinstall(dev_priv);
> > + else if (HAS_PCH_SPLIT(dev_priv))
> > ibx_irq_postinstall(dev_priv);
> >
> > gen8_gt_irq_postinstall(&dev_priv->gt);
> > @@ -3775,13 +3797,6 @@ static void gen8_irq_postinstall(struct
> > drm_i915_private *dev_priv)
> > gen8_master_intr_enable(dev_priv->uncore.regs);
> > }
> >
> > -static void icp_irq_postinstall(struct drm_i915_private *dev_priv)
> > -{
> > - struct intel_uncore *uncore = &dev_priv->uncore;
> > - u32 mask = SDE_GMBUS_ICP;
> > -
> > - GEN3_IRQ_INIT(uncore, SDE, ~mask, 0xffffffff);
> > -}
> >
> > static void gen11_irq_postinstall(struct drm_i915_private *dev_priv)
> > {
> > --
> > 2.29.2
> >
>
--
Sincerely,
Lyude Paul (she/her)
Software Engineer at Red Hat
Note: I deal with a lot of emails and have a lot of bugs on my plate. If you've
asked me a question, are waiting for a review/merge on a patch, etc. and I
haven't responded in a while, please feel free to send me another email to check
on my status. I don't bite!
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