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.
Wa: 14014889975
Signed-off-by: Arun R Murthy <arun.r.mur...@intel.com>
---
drivers/gpu/drm/i915/display/intel_histogram.c | 17 +++++++++++++++++
.../gpu/drm/i915/display/intel_histogram_reg.h | 1 +
2 files changed, 18 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_histogram.c
b/drivers/gpu/drm/i915/display/intel_histogram.c
index 72e9cb5156a0..f776d87dfca0 100644
--- a/drivers/gpu/drm/i915/display/intel_histogram.c
+++ b/drivers/gpu/drm/i915/display/intel_histogram.c
@@ -74,6 +74,11 @@ static void intel_histogram_handle_int_work(struct
work_struct *work)
struct intel_display *display = to_intel_display(intel_crtc);
char *histogram_event[] = {"HISTOGRAM=1", NULL};
+ /* Wa: 14014889975 */
+ if (IS_DISPLAY_VER(display, 12, 13))
+ 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
@@ -94,6 +99,12 @@ static void intel_histogram_handle_int_work(struct
work_struct *work)
"sending HISTOGRAM event failed\n");
}
+ /* Wa: 14014889975 */
+ if (IS_DISPLAY_VER(display, 12, 13))
+ /* Write the value read from DPST_CTL to DPST_CTL.Interrupt
Delay Counter(bit 23:16) */
+ intel_de_write(display, DPST_CTL(intel_crtc->pipe),
intel_de_read(display,
+ DPST_CTL(intel_crtc->pipe)) | 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);
@@ -232,6 +243,12 @@ int intel_histogram_set_iet_lut(struct intel_crtc
*intel_crtc, u32 *data)
return -EINVAL;
}
+ /* Wa: 14014889975 */
+ if (IS_DISPLAY_VER(display, 12, 13))
+ /* Write the value read from DPST_CTL to DPST_CTL.Interrupt
Delay Counter(bit 23:16) */
+ intel_de_write(display, DPST_CTL(intel_crtc->pipe),
intel_de_read(display,
+ DPST_CTL(intel_crtc->pipe)) | DPST_CTL_RESTORE);
+
/*
* Set DPST_CTL Bin Reg function select to IE
* Set DPST_CTL Bin Register Index to 0
diff --git a/drivers/gpu/drm/i915/display/intel_histogram_reg.h
b/drivers/gpu/drm/i915/display/intel_histogram_reg.h
index ed8f22aa8e75..ac392ed47463 100644
--- a/drivers/gpu/drm/i915/display/intel_histogram_reg.h
+++ b/drivers/gpu/drm/i915/display/intel_histogram_reg.h
@@ -16,6 +16,7 @@
#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_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
