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drm/i915/hdcp: Disable the QSES check for HDCP 1.4 over MST

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The HDCP 1.4 spec does not require the QUERY_STREAM_ENCRYPTION_STATUS
check, it was always a nice-to-have. After deploying this across various
devices, we've determined that some MST bridge chips do not properly
support this call for HDCP 1.4 (namely Synaptics and Realtek).

I had considered creating a quirk for this, but I think it's more
prudent to just disable the check entirely since I don't have an idea
how widespread support is.

Changes in v2:
-Rebased on -tip

Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Anshuman Gupta <anshuman.gupta@intel.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210106223909.34476-1-sean@poorly.run #v1
Link: https://patchwork.freedesktop.org/patch/msgid/20210121172620.33066-1-sean@poorly.run
This commit is contained in:
Sean Paul 2021-01-21 12:26:09 -05:00 committed by Anshuman Gupta
parent fed3875720
commit 03b3a759c6
1 changed files with 1 additions and 11 deletions
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12
drivers/gpu/drm/i915/display/intel_dp_hdcp.c
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@ -722,16 +722,6 @@ static bool intel_dp_mst_get_qses_status(struct intel_digital_port *dig_port,
return reply.auth_completed && reply.encryption_enabled;
}
static
bool intel_dp_mst_hdcp_check_link(struct intel_digital_port *dig_port,
struct intel_connector *connector)
{
if (!intel_dp_hdcp_check_link(dig_port, connector))
return false;
return intel_dp_mst_get_qses_status(dig_port, connector);
}
static int
intel_dp_mst_hdcp2_stream_encryption(struct intel_connector *connector,
bool enable)
@ -805,7 +795,7 @@ static const struct intel_hdcp_shim intel_dp_mst_hdcp_shim = {
.read_v_prime_part = intel_dp_hdcp_read_v_prime_part,
.toggle_signalling = intel_dp_hdcp_toggle_signalling,
.stream_encryption = intel_dp_mst_hdcp_stream_encryption,
.check_link = intel_dp_mst_hdcp_check_link,
.check_link = intel_dp_hdcp_check_link,
.hdcp_capable = intel_dp_hdcp_capable,
.write_2_2_msg = intel_dp_hdcp2_write_msg,
.read_2_2_msg = intel_dp_hdcp2_read_msg,