[Intel-gfx] [PATCH v2] drm/i915: remove check for aux irq
Dhinakaran Pandiyan
dhinakaran.pandiyan at intel.com
Thu Jun 21 19:37:29 UTC 2018
On Thu, 2018-06-21 at 10:04 -0700, Lucas De Marchi wrote:
> On Tue, Jun 19, 2018 at 01:17:10PM -0700, Dhinakaran Pandiyan wrote:
> >
> > On Tue, 2018-06-19 at 08:24 -0700, Lucas De Marchi wrote:
> > >
> > > On Tue, Jun 19, 2018 at 7:06 AM Ville Syrjälä
> > > <ville.syrjala at linux.intel.com> wrote:
> > > >
> > > >
> > > >
> > > > On Fri, Jun 15, 2018 at 02:51:06PM -0700, Lucas De Marchi
> > > > wrote:
> > > > >
> > > > >
> > > > > On Fri, Jun 15, 2018 at 08:58:28PM +0300, Ville Syrjälä
> > > > > wrote:
> > > > > >
> > > > > >
> > > > > > On Wed, May 23, 2018 at 11:04:35AM -0700, Lucas De Marchi
> > > > > > wrote:
> > > > > > >
> > > > > > >
> > > > > > > This became dead code with commit 309bd8ed464f
> > > > > > > ("drm/i915:
> > > > > > > Reinstate
> > > > > > > GMBUS and AUX interrupts on gen4/g4x").
> > > > > > >
> > > > > > > v2: Move comment about HW behavior to where decision is
> > > > > > > made
> > > > > > > to enable
> > > > > > > MSI (Ville).
> > > > > > >
> > > > > > > Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > > > > > > Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
> > > > > > > ---
> > > > > > > drivers/gpu/drm/i915/i915_drv.c | 6 ++++++
> > > > > > > drivers/gpu/drm/i915/i915_drv.h | 10 ----------
> > > > > > > drivers/gpu/drm/i915/intel_dp.c | 22 +++++++-----------
> > > > > > > ----
> > > > > > > drivers/gpu/drm/i915/intel_drv.h | 1 -
> > > > > > > drivers/gpu/drm/i915/intel_psr.c | 2 +-
> > > > > > > 5 files changed, 14 insertions(+), 27 deletions(-)
> > > > > > >
> > > > > > > diff --git a/drivers/gpu/drm/i915/i915_drv.c
> > > > > > > b/drivers/gpu/drm/i915/i915_drv.c
> > > > > > > index 9c449b8d8eab..a1461de20472 100644
> > > > > > > --- a/drivers/gpu/drm/i915/i915_drv.c
> > > > > > > +++ b/drivers/gpu/drm/i915/i915_drv.c
> > > > > > > @@ -1189,6 +1189,12 @@ static int
> > > > > > > i915_driver_init_hw(struct
> > > > > > > drm_i915_private *dev_priv)
> > > > > > > * get lost on g4x as well, and interrupt delivery
> > > > > > > seems to
> > > > > > > stay
> > > > > > > * properly dead afterwards. So we'll just disable them
> > > > > > > for
> > > > > > > all
> > > > > > > * pre-gen5 chipsets.
> > > > > > > + *
> > > > > > > + * dp aux and gmbus irq on gen4 seems to be able to
> > > > > > > generate legacy
> > > > > > > + * interrupts even when in MSI mode. This results in
> > > > > > > spurious
> > > > > > > + * interrupt warnings if the legacy irq no. is shared
> > > > > > > with
> > > > > > > another
> > > > > > > + * device. The kernel then disables that interrupt
> > > > > > > source
> > > > > > > and so
> > > > > > > + * prevents the other device from working properly.
> > > > > > > */
> > > > > > > if (INTEL_GEN(dev_priv) >= 5) {
> > > > > > > if (pci_enable_msi(pdev) < 0)
> > > > > > > diff --git a/drivers/gpu/drm/i915/i915_drv.h
> > > > > > > b/drivers/gpu/drm/i915/i915_drv.h
> > > > > > > index b86ed6401120..c5e1f648c47c 100644
> > > > > > > --- a/drivers/gpu/drm/i915/i915_drv.h
> > > > > > > +++ b/drivers/gpu/drm/i915/i915_drv.h
> > > > > > > @@ -2558,16 +2558,6 @@ intel_info(const struct
> > > > > > > drm_i915_private *dev_priv)
> > > > > > > (IS_CANNONLAKE(dev_priv) || \
> > > > > > > IS_SKL_GT3(dev_priv) || IS_SKL_GT4(dev_priv))
> > > > > > >
> > > > > > > -/*
> > > > > > > - * dp aux and gmbus irq on gen4 seems to be able to
> > > > > > > generate
> > > > > > > legacy interrupts
> > > > > > > - * even when in MSI mode. This results in spurious
> > > > > > > interrupt
> > > > > > > warnings if the
> > > > > > > - * legacy irq no. is shared with another device. The
> > > > > > > kernel
> > > > > > > then disables that
> > > > > > > - * interrupt source and so prevents the other device
> > > > > > > from
> > > > > > > working properly.
> > > > > > > - *
> > > > > > > - * Since we don't enable MSI anymore on gen4, we can
> > > > > > > always
> > > > > > > use GMBUS/AUX
> > > > > > > - * interrupts.
> > > > > > > - */
> > > > > > > -#define HAS_AUX_IRQ(dev_priv) true
> > > > > > > #define HAS_GMBUS_IRQ(dev_priv) (INTEL_GEN(dev_priv) >=
> > > > > > > 4)
> > > > > > >
> > > > > > > /* With the 945 and later, Y tiling got adjusted so that
> > > > > > > it
> > > > > > > was 32 128-byte
> > > > > > > diff --git a/drivers/gpu/drm/i915/intel_dp.c
> > > > > > > b/drivers/gpu/drm/i915/intel_dp.c
> > > > > > > index ce07bd794aed..1dab40056df7 100644
> > > > > > > --- a/drivers/gpu/drm/i915/intel_dp.c
> > > > > > > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > > > > > > @@ -936,7 +936,7 @@ intel_dp_check_edp(struct intel_dp
> > > > > > > *intel_dp)
> > > > > > > }
> > > > > > >
> > > > > > > static uint32_t
> > > > > > > -intel_dp_aux_wait_done(struct intel_dp *intel_dp, bool
> > > > > > > has_aux_irq)
> > > > > > > +intel_dp_aux_wait_done(struct intel_dp *intel_dp)
> > > > > > > {
> > > > > > > struct drm_i915_private *dev_priv =
> > > > > > > to_i915(intel_dp_to_dev(intel_dp));
> > > > > > > i915_reg_t ch_ctl = intel_dp->aux_ch_ctl_reg(intel_dp);
> > > > > > > @@ -944,14 +944,10 @@ intel_dp_aux_wait_done(struct
> > > > > > > intel_dp
> > > > > > > *intel_dp, bool has_aux_irq)
> > > > > > > bool done;
> > > > > > >
> > > > > > > #define C (((status = I915_READ_NOTRACE(ch_ctl)) &
> > > > > > > DP_AUX_CH_CTL_SEND_BUSY) == 0)
> > > > > > > - if (has_aux_irq)
> > > > > > > - done = wait_event_timeout(dev_priv-
> > > > > > > >
> > > > > > > > gmbus_wait_queue, C,
> > > > > > > - msecs_to_jiffies_time
> > > > > > > out(
> > > > > > > 10));
> > > > > > > - else
> > > > > > > - done = wait_for(C, 10) == 0;
> > > > > > > + done = wait_event_timeout(dev_priv->gmbus_wait_queue,
> > > > > > > C,
> > > > > > > + msecs_to_jiffies_timeout(10))
> > > > > > > ;
> > > > > > > if (!done)
> > > > > > > - DRM_ERROR("dp aux hw did not signal timeout
> > > > > > > (has
> > > > > > > irq: %i)!\n",
> > > > > > > - has_aux_irq);
> > > > > > > + DRM_ERROR("dp aux hw did not signal
> > > > > > > timeout!\n");
> > > > > > > #undef C
> > > > > > >
> > > > > > > return status;
> > > > > > > @@ -1016,7 +1012,6 @@ static uint32_t
> > > > > > > skl_get_aux_clock_divider(struct intel_dp *intel_dp, int
> > > > > > > index)
> > > > > > > }
> > > > > > >
> > > > > > > static uint32_t g4x_get_aux_send_ctl(struct intel_dp
> > > > > > > *intel_dp,
> > > > > > > - bool has_aux_irq,
> > > > > > > int send_bytes,
> > > > > > > uint32_t
> > > > > > > aux_clock_divider)
> > > > > > > {
> > > > > > > @@ -1037,7 +1032,7 @@ static uint32_t
> > > > > > > g4x_get_aux_send_ctl(struct intel_dp *intel_dp,
> > > > > > >
> > > > > > > return DP_AUX_CH_CTL_SEND_BUSY |
> > > > > > > DP_AUX_CH_CTL_DONE |
> > > > > > > - (has_aux_irq ? DP_AUX_CH_CTL_INTERRUPT : 0) |
> > > > > > > + DP_AUX_CH_CTL_INTERRUPT |
> > > > > > > DP_AUX_CH_CTL_TIME_OUT_ERROR |
> > > > > > > timeout |
> > > > > > > DP_AUX_CH_CTL_RECEIVE_ERROR |
> > > > > > > @@ -1047,13 +1042,12 @@ static uint32_t
> > > > > > > g4x_get_aux_send_ctl(struct intel_dp *intel_dp,
> > > > > > > }
> > > > > > >
> > > > > > > static uint32_t skl_get_aux_send_ctl(struct intel_dp
> > > > > > > *intel_dp,
> > > > > > > - bool has_aux_irq,
> > > > > > > int send_bytes,
> > > > > > > uint32_t unused)
> > > > > > > {
> > > > > > > return DP_AUX_CH_CTL_SEND_BUSY |
> > > > > > > DP_AUX_CH_CTL_DONE |
> > > > > > > - (has_aux_irq ? DP_AUX_CH_CTL_INTERRUPT : 0) |
> > > > > > > + DP_AUX_CH_CTL_INTERRUPT |
> > > > > > > DP_AUX_CH_CTL_TIME_OUT_ERROR |
> > > > > > > DP_AUX_CH_CTL_TIME_OUT_MAX |
> > > > > > > DP_AUX_CH_CTL_RECEIVE_ERROR |
> > > > > > > @@ -1076,7 +1070,6 @@ intel_dp_aux_xfer(struct intel_dp
> > > > > > > *intel_dp,
> > > > > > > int i, ret, recv_bytes;
> > > > > > > uint32_t status;
> > > > > > > int try, clock = 0;
> > > > > > > - bool has_aux_irq = HAS_AUX_IRQ(dev_priv);
> > > > > > > bool vdd;
> > > > > > >
> > > > > > > ch_ctl = intel_dp->aux_ch_ctl_reg(intel_dp);
> > > > > > > @@ -1131,7 +1124,6 @@ intel_dp_aux_xfer(struct intel_dp
> > > > > > > *intel_dp,
> > > > > > >
> > > > > > > while ((aux_clock_divider = intel_dp-
> > > > > > > >
> > > > > > > > get_aux_clock_divider(intel_dp, clock++))) {
> > > > > > > u32 send_ctl = intel_dp-
> > > > > > > >get_aux_send_ctl(intel_dp,
> > > > > > > - has_a
> > > > > > > ux_i
> > > > > > > rq,
> > > > > > > send_
> > > > > > > byte
> > > > > > > s,
> > > > > > > aux_c
> > > > > > > lock
> > > > > > > _divider);
> > > > > > >
> > > > > > > @@ -1148,7 +1140,7 @@ intel_dp_aux_xfer(struct intel_dp
> > > > > > > *intel_dp,
> > > > > > > /* Send the command and wait for it to
> > > > > > > complete */
> > > > > > > I915_WRITE(ch_ctl, send_ctl);
> > > > > > >
> > > > > > > - status =
> > > > > > > intel_dp_aux_wait_done(intel_dp,
> > > > > > > has_aux_irq);
> > > > > > > + status =
> > > > > > > intel_dp_aux_wait_done(intel_dp);
> > > > > > >
> > > > > > > /* Clear done status and any errors */
> > > > > > > I915_WRITE(ch_ctl,
> > > > > > > diff --git a/drivers/gpu/drm/i915/intel_drv.h
> > > > > > > b/drivers/gpu/drm/i915/intel_drv.h
> > > > > > > index 2855363f5b6c..7ac91d5ee3fa 100644
> > > > > > > --- a/drivers/gpu/drm/i915/intel_drv.h
> > > > > > > +++ b/drivers/gpu/drm/i915/intel_drv.h
> > > > > > > @@ -1138,7 +1138,6 @@ struct intel_dp {
> > > > > > > * register with to kick off an AUX transaction.
> > > > > > > */
> > > > > > > uint32_t (*get_aux_send_ctl)(struct intel_dp *dp,
> > > > > > > - bool has_aux_irq,
> > > > > > > int send_bytes,
> > > > > > > uint32_t
> > > > > > > aux_clock_divider);
> > > > > > >
> > > > > > > diff --git a/drivers/gpu/drm/i915/intel_psr.c
> > > > > > > b/drivers/gpu/drm/i915/intel_psr.c
> > > > > > > index db27f2faa1de..ee26f5f33b87 100644
> > > > > > > --- a/drivers/gpu/drm/i915/intel_psr.c
> > > > > > > +++ b/drivers/gpu/drm/i915/intel_psr.c
> > > > > > > @@ -373,7 +373,7 @@ static void hsw_psr_setup_aux(struct
> > > > > > > intel_dp *intel_dp)
> > > > > > > aux_clock_divider = intel_dp-
> > > > > > > >
> > > > > > > > get_aux_clock_divider(intel_dp, 0);
> > > > > > > /* Start with bits set for DDI_AUX_CTL register */
> > > > > > > - aux_ctl = intel_dp->get_aux_send_ctl(intel_dp, 0,
> > > > > > > sizeof(aux_msg),
> > > > > > > + aux_ctl = intel_dp->get_aux_send_ctl(intel_dp,
> > > > > > > sizeof(aux_msg),
> > > > > > > aux_clock_divider)
> > > > > > > ;
> > > > > > Hmm. What's the situation with the PSR stuff here?
> > > > > I hadn't notice this, thanks.
> > > > >
> > > > > I don't see why it would actually be correct though. It seems
> > > > > to
> > > > > be a
> > > > > bug since d4dcbdceabe4 ("drm/i915/psr: Use ->get_aux_send_ctl
> > > > > functions") when the rmw was removed (so whatever was on the
> > > > > register
> > > > > before get overwritten).
> > > > Dunno why you think there's a bug. The problem I see with this
> > > > patch is
> > > > that you're now setting the irq enable bit on the psr aux
> > > > register.
> > > > Does that bit even exist? If so does it do what we want it to
> > > > do?
> > > I was assuming they should be the same. Now I see the psr code
> > > path
> > > gets the bits for
> > > DDI_AUX_CTL and mask to use only the valid bits for
> > > EDP_PSR_AUX_CTL.
> > > Bit 28 will
> > > be left out regardless the return of get_aux_send_ctl()
> > Right.
> >
> > Looking at this code, I realized we should enable the error
> > interrupt
> > (bit-11) for PSR_AUX_CTL too.
> You mean enable it and handle the interrupt, right? Because it's
> currently not being handled.
I see that psr_irq_handler() gets called when the PSR bit is set
in DEIIR/GEN8_DE_MISC_IIR, although we don't do much after the
interrupt is handled.
Do you mean something else?
>
>
> Lucas De Marchi
>
>
> >
> >
> >
> > >
> > >
> > > Lucas De Marchi
> > >
> > > >
> > > >
> > > >
> > > > >
> > > > >
> > > > >
> > > > > CC'ing Daniel who wrote that patch and José/DK who worked
> > > > > recently on
> > > > > psr stuff.
> > > > >
> > > > >
> > > > > Lucas De Marchi
> > > > > >
> > > > > >
> > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > /* Select only valid bits for SRD_AUX_CTL */
> > > > > > > --
> > > > > > > 2.17.0
> > > > > > --
> > > > > > Ville Syrjälä
> > > > > > Intel
> > > > --
> > > > Ville Syrjälä
> > > > Intel
> > > > _______________________________________________
> > > > Intel-gfx mailing list
> > > > Intel-gfx at lists.freedesktop.org
> > > > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
> > >
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