> -----Original Message----- > From: dri-devel <dri-devel-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of > Arun R Murthy > Sent: Tuesday, December 3, 2024 11:25 AM > To: intel-xe@xxxxxxxxxxxxxxxxxxxxx; intel-gfx@xxxxxxxxxxxxxxxxxxxxx; dri- > devel@xxxxxxxxxxxxxxxxxxxxx > Cc: Murthy, Arun R <arun.r.murthy@xxxxxxxxx> > Subject: [PATCHv3 08/10] drm/i915/histogram: histogram delay counter > doesnt reset > > The delay counter for histogram does not reset and as a result the histogram > bin never gets updated. Workaround would be to use save and restore > histogram register. > > v2: Follow the seq in interrupt handler > Restore DPST bit 0 > read/write dpst ctl rg > Restore DPST bit 1 and Guardband Delay Interrupt counter = 0 > (Suraj) > v3: updated wa version for display 13 and 14 > > Wa: 14014889975 LGTM, Reviewed-by: Suraj Kandpal <suraj.kandpal@xxxxxxxxx> > Signed-off-by: Arun R Murthy <arun.r.murthy@xxxxxxxxx> > --- > drivers/gpu/drm/i915/display/intel_histogram.c | 14 ++++++++++++++ > .../gpu/drm/i915/display/intel_histogram_regs.h | 2 ++ > 2 files changed, 16 insertions(+) > > diff --git a/drivers/gpu/drm/i915/display/intel_histogram.c > b/drivers/gpu/drm/i915/display/intel_histogram.c > index 8f25cfe00ba5..66006b75efaa 100644 > --- a/drivers/gpu/drm/i915/display/intel_histogram.c > +++ b/drivers/gpu/drm/i915/display/intel_histogram.c > @@ -59,6 +59,11 @@ static void intel_histogram_handle_int_work(struct > work_struct *work) > snprintf(pipe_id, sizeof(pipe_id), > "PIPE=%u", intel_crtc->base.base.id); > > + /* Wa: 14014889975 */ > + if (IS_DISPLAY_VER(display, 13, 14)) > + intel_de_rmw(display, DPST_CTL(intel_crtc->pipe), > + DPST_CTL_RESTORE, 0); > + > /* > * TODO: PSR to be exited while reading the Histogram data > * Set DPST_CTL Bin Reg function select to TC @@ -101,6 +106,15 @@ > static void intel_histogram_handle_int_work(struct work_struct *work) > return; > } > > + /* Wa: 14014889975 */ > + if (IS_DISPLAY_VER(display, 13, 14)) > + /* Write the value read from DPST_CTL to DPST_CTL.Interrupt > Delay Counter(bit 23:16) */ > + intel_de_rmw(display, DPST_CTL(intel_crtc->pipe), > + DPST_CTL_GUARDBAND_INTERRUPT_DELAY_CNT | > + DPST_CTL_RESTORE, > + DPST_CTL_GUARDBAND_INTERRUPT_DELAY(0x0) | > + DPST_CTL_RESTORE); > + > /* Enable histogram interrupt */ > intel_de_rmw(display, DPST_GUARD(intel_crtc->pipe), > DPST_GUARD_HIST_INT_EN, > DPST_GUARD_HIST_INT_EN); > diff --git a/drivers/gpu/drm/i915/display/intel_histogram_regs.h > b/drivers/gpu/drm/i915/display/intel_histogram_regs.h > index 1252b4f339a6..213c9f483567 100644 > --- a/drivers/gpu/drm/i915/display/intel_histogram_regs.h > +++ b/drivers/gpu/drm/i915/display/intel_histogram_regs.h > @@ -16,6 +16,8 @@ > #define DPST_CTL_RESTORE REG_BIT(28) > #define DPST_CTL_IE_MODI_TABLE_EN REG_BIT(27) > #define DPST_CTL_HIST_MODE REG_BIT(24) > +#define DPST_CTL_GUARDBAND_INTERRUPT_DELAY_CNT > REG_GENMASK(23, 16) > +#define DPST_CTL_GUARDBAND_INTERRUPT_DELAY(val) > REG_FIELD_PREP(DPST_CTL_GUARDBAND_INTERRUPT_DELAY_CNT, > val) > #define DPST_CTL_ENHANCEMENT_MODE_MASK > REG_GENMASK(14, 13) > #define DPST_CTL_EN_MULTIPLICATIVE > REG_FIELD_PREP(DPST_CTL_ENHANCEMENT_MODE_MASK, 2) > #define DPST_CTL_IE_TABLE_VALUE_FORMAT REG_BIT(15) > -- > 2.25.1
