On 2020-11-03 at 17:06:42 -0500, Rodrigo Vivi wrote:
> On Fri, Oct 30, 2020 at 11:46:58AM +0530, Anshuman Gupta wrote:
> > From: Bob Paauwe <bob.j.paauwe@xxxxxxxxx>
> >
> > The WA specifies that we need to toggle a SDE chicken bit on and then
> > off as the final step in preparation for s0ix entry.
> >
> > Bspec: 33450
> > Bspec: 8402
> >
> > However, something is happening after we toggle the bit that causes
> > the WA to be invalidated. This makes dispcnlunit1_cp_xosc_clkreq
> > active being already in s0ix state i.e SLP_S0 counter incremented.
> > Tweaking the Wa_14010685332 by setting the bit on suspend and clearing
> > it on resume turns down the dispcnlunit1_cp_xosc_clkreq.
> > B.Spec has Documented this tweaked sequence of WA as an alternative.
> > Let keep this tweaked WA for Gen11 platforms and keep untweaked WA for
> > other platforms which never observed this issue.
> >
> > v2 (MattR):
> > - Change the comment on the workaround to give PCH names rather than
> > platform names. Although the bspec is setup to list workarounds by
> > platform, the hardware team has confirmed that the actual issue being
> > worked around here is something that was introduced back in the
> > Cannon Lake PCH and carried forward to subsequent PCH's.
> > - Extend the untweaked version of the workaround to include PCH_CNP as
> > well. Note that since PCH_CNP is used to represent CMP, this will
> > apply on CML and some variants of RKL too.
> > - Cap the untweaked version of the workaround so that it won't apply to
> > "fake" PCH's (i.e., DG1). The issue we're working around really is
> > an issue in the PCH itself, not the South Display, so it shouldn't
> > apply when there isn't a real PCH.
> >
> > Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
> > Signed-off-by: Bob Paauwe <bob.j.paauwe@xxxxxxxxx>
> > Signed-off-by: Anshuman Gupta <anshuman.gupta@xxxxxxxxx>
> > Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
> > ---
> > .../drm/i915/display/intel_display_power.c | 21 +++++++++++++++++--
> > drivers/gpu/drm/i915/i915_irq.c | 6 ++++--
> > 2 files changed, 23 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c
> > index 689922480661..d2a6518329d7 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display_power.c
> > +++ b/drivers/gpu/drm/i915/display/intel_display_power.c
> > @@ -5858,17 +5858,34 @@ static void intel_power_domains_verify_state(struct drm_i915_private *i915)
> >
> > void intel_display_power_suspend_late(struct drm_i915_private *i915)
> > {
> > - if (INTEL_GEN(i915) >= 11 || IS_GEN9_LP(i915))
> > + u32 val;
> > +
> > + if (INTEL_GEN(i915) >= 11 || IS_GEN9_LP(i915)) {
> > bxt_enable_dc9(i915);
> > - else if (IS_HASWELL(i915) || IS_BROADWELL(i915))
> > + /* Tweaked Wa_14010685332:icp,jsp,mcc */
> > + if (INTEL_PCH_TYPE(i915) >= PCH_ICP && INTEL_PCH_TYPE(i915) <= PCH_MCC) {
> > + val = intel_de_read(i915, SOUTH_CHICKEN1);
> > + val |= SBCLK_RUN_REFCLK_DIS;
> > + intel_de_write(i915, SOUTH_CHICKEN1, val);
>
> could we use intel_de_rmw here?
May be i had misunderstod it earlier, i thought it was your recommendation
to use manual read, modify write without using intel_uncore_rmw(),
Was the actual idea to use intel_de_rmw flavour of API instead of intel_uncore_rmw?
Also would it require to use at original Wa in gen11_display_irq_reset as well?
Thanks,
Anshuman Gupta.
>
> > + }
> > + } else if (IS_HASWELL(i915) || IS_BROADWELL(i915)) {
> > hsw_enable_pc8(i915);
> > + }
> > }
> >
> > void intel_display_power_resume_early(struct drm_i915_private *i915)
> > {
> > + u32 val;
> > +
> > if (INTEL_GEN(i915) >= 11 || IS_GEN9_LP(i915)) {
> > gen9_sanitize_dc_state(i915);
> > bxt_disable_dc9(i915);
> > + /* Tweaked Wa_14010685332:icp,jsp,mcc */
> > + if (INTEL_PCH_TYPE(i915) >= PCH_ICP && INTEL_PCH_TYPE(i915) <= PCH_MCC) {
> > + val = intel_de_read(i915, SOUTH_CHICKEN1);
> > + val &= ~SBCLK_RUN_REFCLK_DIS;
> > + intel_de_write(i915, SOUTH_CHICKEN1, val);
>
> and here?
>
> sorry for not having spotted that sooner.
>
> > + }
> > } else if (IS_HASWELL(i915) || IS_BROADWELL(i915)) {
> > hsw_disable_pc8(i915);
> > }
> > diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> > index dc33c96d741d..410c03624c6a 100644
> > --- a/drivers/gpu/drm/i915/i915_irq.c
> > +++ b/drivers/gpu/drm/i915/i915_irq.c
> > @@ -3055,8 +3055,10 @@ 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:icl,jsl,ehl,tgl,rkl */
> > - if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP) {
> > + /* 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,
> > --
> > 2.26.2
> >
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
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