[Intel-gfx] [PATCH] drm/i915: HSW/BDW PSR Set idle_frames=2 since sometimes it can be off by 1.

[Rodrigo Vivi]

It was identified that in some cases when moving cursor Hardware can do
mistake with idle_frame count. So Spec is being updated to use
2 as minimum idle_frames.

Reference: https://hsdhsw.intel.com/hsd/haswell_platform/default.aspx#sighting/default.aspx?sighting_id=4394433
Cc: Arthur Runyan <arthur.j.runyan at intel.com>
Cc: Jani Nikula <jani.nikula at intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 47e9d71..8cfbbc2 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2178,7 +2178,7 @@ static void intel_edp_psr_enable_source(struct intel_dp *intel_dp)
 	struct drm_device *dev = dig_port->base.base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	uint32_t max_sleep_time = 0x1f;
-	uint32_t idle_frames = 1;
+	uint32_t idle_frames = 2; /* 2 is the minimum allowed */
 	uint32_t val = 0x0;
 	const uint32_t link_entry_time = EDP_PSR_MIN_LINK_ENTRY_TIME_8_LINES;
 	bool only_standby = false;
-- 
1.9.3