[PATCHv2 2/5] drm/i915/display: histogram interrupt handling
Murthy, Arun R
arun.r.murthy at intel.com
Sun Sep 15 14:09:49 UTC 2024
> > Upon enabling histogram an interrupt is trigerred after the generation
> > of the statistics. This patch registers the histogram interrupt and
> > handles the interrupt.
> >
> > v2: Added intel_crtc backpointer to intel_histogram struct (Jani)
> > Removed histogram_wq and instead use dev_priv->unodered_eq (Jani)
>
> Typo here "wq"
Done
>
> >
> > Signed-off-by: Arun R Murthy <arun.r.murthy at intel.com>
> > ---
> > .../gpu/drm/i915/display/intel_display_irq.c | 6 +-
> > .../gpu/drm/i915/display/intel_histogram.c | 80 ++++++++++++++++++-
> > .../gpu/drm/i915/display/intel_histogram.h | 3 +
> > drivers/gpu/drm/i915/i915_reg.h | 5 +-
> > 4 files changed, 89 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_display_irq.c
> > b/drivers/gpu/drm/i915/display/intel_display_irq.c
> > index afcd2af82942..0178595102bb 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display_irq.c
> > +++ b/drivers/gpu/drm/i915/display/intel_display_irq.c
> > @@ -17,6 +17,7 @@
> > #include "intel_fdi_regs.h"
> > #include "intel_fifo_underrun.h"
> > #include "intel_gmbus.h"
> > +#include "intel_histogram.h"
> > #include "intel_hotplug_irq.h"
> > #include "intel_pipe_crc_regs.h"
> > #include "intel_pmdemand.h"
> > @@ -1170,6 +1171,9 @@ void gen8_de_irq_handler(struct
> drm_i915_private
> > *dev_priv, u32 master_ctl)
> > if (iir & gen8_de_pipe_underrun_mask(dev_priv))
> > intel_cpu_fifo_underrun_irq_handler(dev_priv,
> > pipe);
> >
> > + if (iir & GEN9_PIPE_HISTOGRAM_EVENT)
> > + intel_histogram_irq_handler(dev_priv, pipe);
> > +
> > fault_errors = iir & gen8_de_pipe_fault_mask(dev_priv);
> > if (fault_errors)
> > drm_err_ratelimited(&dev_priv->drm,
> > @@ -1701,7 +1705,7 @@ void gen8_de_irq_postinstall(struct
> > drm_i915_private *dev_priv)
> > struct intel_uncore *uncore = &dev_priv->uncore;
> >
> > u32 de_pipe_masked = gen8_de_pipe_fault_mask(dev_priv) |
> > - GEN8_PIPE_CDCLK_CRC_DONE;
> > + GEN8_PIPE_CDCLK_CRC_DONE |
> > GEN9_PIPE_HISTOGRAM_EVENT;
> > u32 de_pipe_enables;
> > u32 de_port_masked = gen8_de_port_aux_mask(dev_priv);
> > u32 de_port_enables;
> > diff --git a/drivers/gpu/drm/i915/display/intel_histogram.c
> > b/drivers/gpu/drm/i915/display/intel_histogram.c
> > index 45e968e00af6..83ba826a7a89 100644
> > --- a/drivers/gpu/drm/i915/display/intel_histogram.c
> > +++ b/drivers/gpu/drm/i915/display/intel_histogram.c
> > @@ -19,12 +19,83 @@
> >
> > struct intel_histogram {
> > struct drm_i915_private *i915;
> > + struct intel_crtc *crtc;
> > + struct delayed_work handle_histogram_int_work;
>
> Too long of a name delayed_work should be enough since it will be called as
> Histogram->delayed_work which is self explanatory
>
Done
> > bool enable;
> > bool can_enable;
> > - enum pipe pipe;
> > u32 bindata[HISTOGRAM_BIN_COUNT];
> > };
> >
> > +static void intel_histogram_handle_int_work(struct work_struct *work) {
> > + struct intel_histogram *histogram = container_of(work,
> > + struct intel_histogram, handle_histogram_int_work.work);
> > + struct drm_i915_private *i915 = histogram->i915;
>
> Lets not use it like this here we have intel_crtc use this to get intel_display by
> to_intel_display(crtc) and I don't see the use for i915 since display will do the
> job
>
Done
> > + struct intel_crtc *intel_crtc = histogram->crtc;
> > + char *histogram_event[] = {"HISTOGRAM=1", NULL};
> > + u32 dpstbin;
> > + int i, try = 0;
> > +
> > + /*
> > + * TODO: PSR to be exited while reading the Histogram data
> > + * Set DPST_CTL Bin Reg function select to TC
> > + * Set DPST_CTL Bin Register Index to 0
> > + */
>
> You may have to think on how you will be able to get the intel_dp structure
> here You may need to add it in you histogram structure to get intel_psr
> structure Then check if psr->enabled And suspend and resume psr based on
> that Something to think about
>
Yes will take this up later.
> > +retry:
> > + intel_de_rmw(i915, DPST_CTL(intel_crtc->pipe),
>
> I915 can be replaced with intel_display . can be also replaced in all other
> Occurrences of i915 in this patch where we don't need the unordered_wq
>
Done
>
> > + DPST_CTL_BIN_REG_FUNC_SEL |
> > DPST_CTL_BIN_REG_MASK, 0);
> > + for (i = 0; i < HISTOGRAM_BIN_COUNT; i++) {
> > + dpstbin = intel_de_read(i915, DPST_BIN(intel_crtc->pipe));
> > + if (dpstbin & DPST_BIN_BUSY) {
> > + /*
> > + * If DPST_BIN busy bit is set, then set the
> > + * DPST_CTL bin reg index to 0 and proceed
> > + * from beginning.
> > + */
> > + if (try++ >= 5) {
> > + drm_err(&i915->drm,
> > + "Histogram block is busy, failed to
> > read\n");
> > + intel_de_rmw(i915, DPST_GUARD(intel_crtc-
> > >pipe),
> > +
> > DPST_GUARD_HIST_EVENT_STATUS, 1);
> > + return;
> > + }
> > + goto retry;
> > + }
> > + histogram->bindata[i] = dpstbin & DPST_BIN_DATA_MASK;
> > + drm_dbg_atomic(&i915->drm, "Histogram[%d]=%x\n",
> > + i, histogram->bindata[i]);
> > + }
> > +
> > + /* Notify user for Histogram rediness */
>
> Typo "readiness"
>
> > + if (kobject_uevent_env(&i915->drm.primary->kdev->kobj,
> > KOBJ_CHANGE,
> > + histogram_event))
> > + drm_err(&i915->drm, "sending HISTOGRAM event failed\n");
> > +
> > + /* Enable histogram interrupt */
> > + intel_de_rmw(i915, DPST_GUARD(intel_crtc->pipe),
> > DPST_GUARD_HIST_INT_EN,
> > + DPST_GUARD_HIST_INT_EN);
> > +
> > + /* Clear histogram interrupt by setting histogram interrupt status
> > bit*/
> > + intel_de_rmw(i915, DPST_GUARD(intel_crtc->pipe),
> > + DPST_GUARD_HIST_EVENT_STATUS, 1); }
> > +
> > +void intel_histogram_irq_handler(struct drm_i915_private *i915, enum
> > +pipe pipe) {
> > + struct intel_crtc *intel_crtc =
> > + to_intel_crtc(drm_crtc_from_index(&i915->drm, pipe));
> > + struct intel_histogram *histogram = intel_crtc->histogram;
> > +
> > + if (!histogram->enable) {
> > + drm_err(&i915->drm,
> > + "spurious interrupt, histogram not enabled\n");
> > + return;
> > + }
> > +
> > + queue_delayed_work(i915->unordered_wq,
> > + &histogram->handle_histogram_int_work, 0); }
> > +
> > int intel_histogram_atomic_check(struct intel_crtc *intel_crtc) {
> > struct intel_histogram *histogram = intel_crtc->histogram; @@ -
> > 120,6 +191,7 @@ static void intel_histogram_disable(struct intel_crtc
> > *intel_crtc)
> > intel_de_rmw(i915, DPST_CTL(pipe),
> > DPST_CTL_IE_HIST_EN, 0);
> >
> > + cancel_delayed_work(&histogram->handle_histogram_int_work);
> > histogram->enable = false;
> > }
> >
> > @@ -181,6 +253,7 @@ void intel_histogram_deinit(struct intel_crtc
> > *intel_crtc) {
> > struct intel_histogram *histogram = intel_crtc->histogram;
> >
> > + cancel_delayed_work_sync(&histogram-
> > >handle_histogram_int_work);
> > kfree(histogram);
> > }
> >
> > @@ -196,9 +269,12 @@ int intel_histogram_init(struct intel_crtc *intel_crtc)
> > }
> >
> > intel_crtc->histogram = histogram;
> > - histogram->pipe = intel_crtc->pipe;
> > + histogram->crtc = intel_crtc;
>
> Why even add it in patch 1 to delete it patch 2 lets not add it to begin with,
> Also we don't need the intel_pipe variable in intel_histogram since it can be
> derived from Intel_crtc.
>
Done
Thanks and Regards,
Arun R Murthy
---------------------
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