WA 0884:bxt:all,cnl:*:A - "When FBC is enabled with eDP PSR,
the CPU host modify writes may not get updated on the Display
as expected.
WA: Write 0x00000000 to CUR_SURFLIVE_A with every CPU
host modify write to trigger PSR exit."
We can also find on spec other cases where they describe
bogus writes to cursor registers to force PSR exit with
HW tracking. And it was confirmed by HW engineers that
this Wa can be safely applied for any frontbuffer activity.
So let's use this more and more here instead of forcibly
disable and re-enable PSR everytime that we have a simple
reliable flush case.
Other commits improve the fbcon/fbdev use a lot, but this
approach is the only when where we can get a fully reliable
console with no slowness or missed frames and PSR still
enabled and active.
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 3 +++
drivers/gpu/drm/i915/intel_psr.c | 15 +++++++++++++--
2 files changed, 16 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index f6afa5e5e7c1..ac09d17cd835 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6007,6 +6007,9 @@ enum {
#define IVB_CURSOR_B_OFFSET 0x71080
#define IVB_CURSOR_C_OFFSET 0x72080
+#define _CUR_SURLIVE 0x700AC
+#define CUR_SURLIVE(pipe) _CURSOR2(pipe, _CUR_SURLIVE)
+
/* Display A control */
#define _DSPACNTR 0x70180
#define DISPLAY_PLANE_ENABLE (1<<31)
diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
index 13409c6301e8..49554036ffb8 100644
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -946,8 +946,19 @@ void intel_psr_flush(struct drm_i915_private *dev_priv,
dev_priv->psr.busy_frontbuffer_bits &= ~frontbuffer_bits;
/* By definition flush = invalidate + flush */
- if (frontbuffer_bits)
- intel_psr_exit(dev_priv);
+ if (frontbuffer_bits) {
+ if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
+ intel_psr_exit(dev_priv);
+ } else {
+ /*
+ * Display WA #0884: all
+ * This documented WA for bxt can be safely applied
+ * broadly so we can force HW tracking to exit PSR
+ * instead of disabling and re-enabling.
+ */
+ I915_WRITE(CUR_SURLIVE(pipe), 0);
+ }
+ }
if (!dev_priv->psr.active && !dev_priv->psr.busy_frontbuffer_bits) {
if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
--
2.13.6
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