From 58cfa3297aa0779e18b7cbb5e6c6301f97c5f776 Mon Sep 17 00:00:00 2001 From: Juston Li Date: Thu, 19 Aug 2021 11:48:33 -0700 Subject: [PATCH] drm/i915/hdcp: update cp_irq_count_cached in intel_dp_hdcp2_read_msg() 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 Acked-by: Anshuman Gupta Reviewed-by: Ramalingam C Tested-by: Suraj K Signed-off-by: Anshuman Gupta Link: https://patchwork.freedesktop.org/patch/msgid/20210819184835.1181323-2-juston.li@intel.com --- 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) -- 2.11.0