From b5d583861cb109a666ba9c5baee5c0f86fe54ae1 Mon Sep 17 00:00:00 2001
From: Juston Li <juston.li@intel.com>
Date: Thu, 19 Aug 2021 11:48:33 -0700
Subject: drm/i915/hdcp: update cp_irq_count_cached in
intel_dp_hdcp2_read_msg()
Git-commit: 58cfa3297aa0779e18b7cbb5e6c6301f97c5f776
Patch-mainline: v5.16-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
Update cp_irq_count_cached when reading messages rather than when
writing a message to make sure the value is up to date and not
stale from a previously handled CP_IRQ.
AKE flow doesn't always respond to a read with a ACK write msg.
E.g. AKE_Send_Pairing_Info will "timeout" because we received
a CP_IRQ for reading AKE_Send_H_Prime but no write occurred between that
and reading AKE_Send_Pairing_Info so cp_irq_count_cached is stale
causing the wait to return right away rather than waiting for a new
CP_IRQ.
Signed-off-by: Juston Li <juston.li@intel.com>
Acked-by: Anshuman Gupta <anshuman.gupta@intel.com>
Reviewed-by: Ramalingam C <ramalingam.c@intel.com>
Tested-by: Suraj K <suraj.kandpal@intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210819184835.1181323-2-juston.li@intel.com
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/i915/display/intel_dp_hdcp.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp_hdcp.c b/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
index d697d169e8c1..1d0096654776 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_hdcp.c
@@ -446,8 +446,6 @@ static
int intel_dp_hdcp2_write_msg(struct intel_digital_port *dig_port,
void *buf, size_t size)
{
- struct intel_dp *dp = &dig_port->dp;
- struct intel_hdcp *hdcp = &dp->attached_connector->hdcp;
unsigned int offset;
u8 *byte = buf;
ssize_t ret, bytes_to_write, len;
@@ -463,8 +461,6 @@ int intel_dp_hdcp2_write_msg(struct intel_digital_port *dig_port,
bytes_to_write = size - 1;
byte++;
- hdcp->cp_irq_count_cached = atomic_read(&hdcp->cp_irq_count);
-
while (bytes_to_write) {
len = bytes_to_write > DP_AUX_MAX_PAYLOAD_BYTES ?
DP_AUX_MAX_PAYLOAD_BYTES : bytes_to_write;
@@ -530,6 +526,8 @@ int intel_dp_hdcp2_read_msg(struct intel_digital_port *dig_port,
u8 msg_id, void *buf, size_t size)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
+ struct intel_dp *dp = &dig_port->dp;
+ struct intel_hdcp *hdcp = &dp->attached_connector->hdcp;
unsigned int offset;
u8 *byte = buf;
ssize_t ret, bytes_to_recv, len;
@@ -546,6 +544,8 @@ int intel_dp_hdcp2_read_msg(struct intel_digital_port *dig_port,
if (ret < 0)
return ret;
+ hdcp->cp_irq_count_cached = atomic_read(&hdcp->cp_irq_count);
+
if (msg_id == HDCP_2_2_REP_SEND_RECVID_LIST) {
ret = get_receiver_id_list_size(dig_port);
if (ret < 0)
--
2.38.1