[Intel-gfx] [PATCH] drm/i915/hdcp: Add additional R0' wait

Sean Paul sean at poorly.run
Tue May 19 22:16:21 UTC 2020

From: Sean Paul <seanpaul at chromium.org>

We're seeing some R0' mismatches in the field, particularly with
repeaters. I'm guessing the (already lenient) 300ms wait time isn't
enough for some setups. So add an additional wait when R0' is

Signed-off-by: Sean Paul <seanpaul at chromium.org>
 drivers/gpu/drm/i915/display/intel_hdcp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
index 2cbc4619b4ce..924a717a4fa4 100644
--- a/drivers/gpu/drm/i915/display/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
@@ -592,6 +592,9 @@ int intel_hdcp_auth_downstream(struct intel_connector *connector)
 		if (!ret)
+		/* Maybe the sink is lazy, give it some more time */
+		usleep_range(10000, 50000);
 	if (i == tries) {
Sean Paul, Software Engineer, Google / Chromium OS

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