[Intel-gfx] [PATCH 06/10] drm/i915/icl: Mark TC port as safe when interruptions are disabled

[José Roberto de Souza]

Before enter in power saving states or before unload the driver
spec states that display driver is required to to mark TC ports as
safe so hardware can do the disconnection flow without wait for
display driver handshake.
When driver is resumed or loaded again, if the TC live state is
still set as connected driver will mark again TC port as not safe as
required by spec.

BSpec: 2175

Cc: Paulo Zanoni <paulo.r.zanoni at intel.com>
Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 2e242270e270..58616690f45f 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -3640,6 +3640,7 @@ static void gen11_irq_reset(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int pipe;
+	u32 val;
 
 	I915_WRITE(GEN11_GFX_MSTR_IRQ, 0);
 	POSTING_READ(GEN11_GFX_MSTR_IRQ);
@@ -3661,6 +3662,15 @@ static void gen11_irq_reset(struct drm_device *dev)
 
 	if (HAS_PCH_ICP(dev_priv))
 		GEN3_IRQ_RESET(SDE);
+
+	/*
+	 * Mark TC ports as safe so hardware can do the disconnect flow without
+	 * wait for driver to do the handshake
+	 */
+	val = I915_READ(PORT_TX_DFLEXDPCSSS);
+	for (pipe = 0; pipe < 4; pipe++)
+		val &= ~(DP_PHY_MODE_STATUS_NOT_SAFE(pipe));
+	I915_WRITE(PORT_TX_DFLEXDPCSSS, val);
 }
 
 void gen8_irq_power_well_post_enable(struct drm_i915_private *dev_priv,
-- 
2.19.0