This workaround fixes screen flickers with FBC.
BSpec: 33450
BSpec: 52890
BSpec: 54369
BSpec: 66624
Cc: Matt Roper <matthew.d.roper@xxxxxxxxx>
Signed-off-by: José Roberto de Souza <jose.souza@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_fbc.c | 9 +++++++++
drivers/gpu/drm/i915/i915_reg.h | 1 +
2 files changed, 10 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
index 670835318a1f1..b7bdb0739744a 100644
--- a/drivers/gpu/drm/i915/display/intel_fbc.c
+++ b/drivers/gpu/drm/i915/display/intel_fbc.c
@@ -811,6 +811,14 @@ static void intel_fbc_program_cfb(struct intel_fbc *fbc)
fbc->funcs->program_cfb(fbc);
}
+static void intel_fbc_program_workarounds(struct intel_fbc *fbc)
+{
+ /* Wa_22014263786:icl,jsl,tgl,dg1,rkl,adls,dg2,adlp */
+ if (DISPLAY_VER(fbc->i915) >= 11)
+ intel_de_rmw(fbc->i915, ILK_DPFC_CHICKEN(fbc->id), 0,
+ DPFC_CHICKEN_FORCE_SLB_INVALIDATION);
+}
+
static void __intel_fbc_cleanup_cfb(struct intel_fbc *fbc)
{
struct drm_i915_private *i915 = fbc->i915;
@@ -1462,6 +1470,7 @@ static void __intel_fbc_enable(struct intel_atomic_state *state,
intel_fbc_update_state(state, crtc, plane);
+ intel_fbc_program_workarounds(fbc);
intel_fbc_program_cfb(fbc);
}
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index fef71b242706a..0ec7123197fcb 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1400,6 +1400,7 @@
#define DPFC_HT_MODIFY REG_BIT(31) /* pre-ivb */
#define DPFC_NUKE_ON_ANY_MODIFICATION REG_BIT(23) /* bdw+ */
#define DPFC_CHICKEN_COMP_DUMMY_PIXEL REG_BIT(14) /* glk+ */
+#define DPFC_CHICKEN_FORCE_SLB_INVALIDATION REG_BIT(13) /* icl+ */
#define DPFC_DISABLE_DUMMY0 REG_BIT(8) /* ivb+ */
#define GLK_FBC_STRIDE(fbc_id) _MMIO_PIPE((fbc_id), 0x43228, 0x43268)
--
2.35.3
