From: Ben Widawsky <benjamin.widawsky@xxxxxxxxxxxxxxx>
This is a requirement added to the spec. This patch will present
persistent corruption on the display.
Cc: Art Runyan <arthur.j.runyan@xxxxxxxxx>
Signed-off-by: Ben Widawsky <ben@xxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_display.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 7f02444..ebc84ee 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3583,7 +3583,7 @@ void hsw_disable_ips(struct intel_crtc *crtc)
return;
assert_plane_enabled(dev_priv, crtc->plane);
- if (IS_BROADWELL(crtc->base.dev)) {
+ if (IS_BROADWELL(dev)) {
mutex_lock(&dev_priv->rps.hw_lock);
WARN_ON(sandybridge_pcode_write(dev_priv, DISPLAY_IPS_CONTROL, 0));
mutex_unlock(&dev_priv->rps.hw_lock);
@@ -3594,6 +3594,10 @@ void hsw_disable_ips(struct intel_crtc *crtc)
/* We need to wait for a vblank before we can disable the plane. */
intel_wait_for_vblank(dev, crtc->pipe);
+
+ /* wait for pcode to finish disabling IPS, which may take up to 42ms */
+ if (IS_BROADWELL(dev))
+ msleep(42);
}
/** Loads the palette/gamma unit for the CRTC with the prepared values */
--
1.9.1
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