>From the bspec:
"SW must always program the FBC_RT_BASE_ADDR_REGISTER_* register
in Render Engine to a reserved value (0xFFFF_FFFF) such that the
programmed value doesn’t match the render target surface address
programmed. This would disable render engine from generating
modify messages to FBC unit in display."
Bspec: 11388
Bspec: 33451
Cc: José Roberto de Souza <jose.souza@xxxxxxxxx>
Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
---
drivers/gpu/drm/i915/gt/intel_workarounds.c | 6 ++++++
drivers/gpu/drm/i915/i915_reg.h | 1 +
2 files changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index 704ace01e7f5..29b50e2c0627 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -567,6 +567,12 @@ static void icl_ctx_workarounds_init(struct intel_engine_cs *engine,
/* allow headerless messages for preemptible GPGPU context */
WA_SET_BIT_MASKED(GEN10_SAMPLER_MODE,
GEN11_SAMPLER_ENABLE_HEADLESS_MSG);
+
+ /* Wa_1604278689:icl,ehl */
+ wa_write_masked_or(wal, IVB_FBC_RT_BASE_UPPER,
+ 0, /* write-only register; skip validation */
+ 0xFFFFFFFF);
+ wa_write(wal, IVB_FBC_RT_BASE, 0xFFFFFFFF);
}
static void
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index def6dbdc7e2e..14af1b1dc0d3 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3214,6 +3214,7 @@ enum i915_power_well_id {
/* Framebuffer compression for Ivybridge */
#define IVB_FBC_RT_BASE _MMIO(0x7020)
+#define IVB_FBC_RT_BASE_UPPER _MMIO(0x7024)
#define IPS_CTL _MMIO(0x43408)
#define IPS_ENABLE (1 << 31)
--
2.20.1
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