Please also send this patch to dri-devel@lists.freedesktop.org as well because this is a drm change.
-----Original Message----- From: Gupta, Anshuman Sent: Wednesday, January 27, 2021 12:55 PM To: Li, Juston juston.li@intel.com; intel-gfx@lists.freedesktop.org Cc: seanpaul@chromium.org; C, Ramalingam ramalingam.c@intel.com Subject: RE: [PATCH v2 3/4] drm/i915/hdcp: read RxInfo once when reading Send_Pairing_Info
-----Original Message----- From: Li, Juston juston.li@intel.com Sent: Wednesday, January 27, 2021 12:21 PM To: intel-gfx@lists.freedesktop.org Cc: seanpaul@chromium.org; Gupta, Anshuman
C, Ramalingam ramalingam.c@intel.com; Li, Juston juston.li@intel.com Subject: [PATCH v2 3/4] drm/i915/hdcp: read RxInfo once when reading Send_Pairing_Info
Previously when reading Send_Pairing_Info, RxInfo by itself was read once to retrieve the DEVICE_COUNT and then a second time when reading the RepeaterAuth_Send_ReceiverID_List which contains RxInfo.
On a couple HDCP 2.2 docks, this second read attempt on RxInfo fails due to no Ack response. This behavior doesn't seem to be defined but regardless we can fix it by reading RxInfo once and storing it before reading the rest of RepeaterAuth_Send_ReceiverID_List once we know the
size.
Modify get_receiver_id_list_size() to read and store RxInfo in the message buffer and also parse DEVICE_COUNT so we know the size of RepeaterAuth_Send_ReceiverID_List.
Afterwards, retrieve the rest of the message at the offset for seq_num_V.
Changes in v2:
- remove unnecessary moving of drm_i915_private from patch 1
Signed-off-by: Juston Li juston.li@intel.com
drivers/gpu/drm/i915/display/intel_dp_hdcp.c | 29 ++++++++++---------- include/drm/drm_dp_helper.h | 2 +- 2 files changed, 16 insertions(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp_hdcp.c b/drivers/gpu/drm/i915/display/intel_dp_hdcp.c index d1397af97f69..cd183944bc5a 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_hdcp.c +++ b/drivers/gpu/drm/i915/display/intel_dp_hdcp.c @@ -475,11 +475,10 @@ int intel_dp_hdcp2_write_msg(struct intel_digital_port *dig_port, }
static -ssize_t get_receiver_id_list_size(struct intel_digital_port *dig_port) +ssize_t get_receiver_id_list_rx_info(struct intel_digital_port +*dig_port, u32 *dev_cnt, u8 *byte) {
- u8 rx_info[HDCP_2_2_RXINFO_LEN];
- u32 dev_cnt; ssize_t ret;
u8 *rx_info = byte;
ret = drm_dp_dpcd_read(&dig_port->dp.aux, DP_HDCP_2_2_REG_RXINFO_OFFSET, @@ -
487,15 +486,11 @@ ssize_t get_receiver_id_list_size(struct intel_digital_port *dig_port) if (ret != HDCP_2_2_RXINFO_LEN) return ret >= 0 ? -EIO : ret;
- dev_cnt = (HDCP_2_2_DEV_COUNT_HI(rx_info[0]) << 4 |
- *dev_cnt = (HDCP_2_2_DEV_COUNT_HI(rx_info[0]) << 4 | HDCP_2_2_DEV_COUNT_LO(rx_info[1]));
- if (dev_cnt > HDCP_2_2_MAX_DEVICE_COUNT)
dev_cnt = HDCP_2_2_MAX_DEVICE_COUNT;- ret = sizeof(struct hdcp2_rep_send_receiverid_list) -
HDCP_2_2_RECEIVER_IDS_MAX_LEN +(dev_cnt * HDCP_2_2_RECEIVER_ID_LEN);
if (*dev_cnt > HDCP_2_2_MAX_DEVICE_COUNT)
*dev_cnt = HDCP_2_2_MAX_DEVICE_COUNT;return ret;
} @@ -511,6 +506,7 @@ int intel_dp_hdcp2_read_msg(struct intel_digital_port *dig_port, u8 *byte = buf; ssize_t ret, bytes_to_recv, len; const struct hdcp2_dp_msg_data *hdcp2_msg_data;
u32 dev_cnt;
hdcp2_msg_data = get_hdcp2_dp_msg_data(msg_id); if (!hdcp2_msg_data)
@@ -523,17 +519,22 @@ int intel_dp_hdcp2_read_msg(struct intel_digital_port *dig_port,
hdcp->cp_irq_count_cached = atomic_read(&hdcp->cp_irq_count);
- /* DP adaptation msgs has no msg_id */
- byte++;
- if (msg_id == HDCP_2_2_REP_SEND_RECVID_LIST) {
ret = get_receiver_id_list_size(dig_port);
ret = get_receiver_id_list_rx_info(dig_port, &dev_cnt,byte); if (ret < 0) return ret;
size = ret;
byte += ret;size = sizeof(struct hdcp2_rep_send_receiverid_list) -HDCP_2_2_RXINFO_LEN -HDCP_2_2_RECEIVER_IDS_MAX_LEN +
(dev_cnt * HDCP_2_2_RECEIVER_ID_LEN);
bytes_to_recv = size - 1;
/* DP adaptation msgs has no msg_id */
Please remove this comment. With that Acked-by: Anshuman Gupta anshuman.gupta@intel.com
- byte++;
bytes_to_recv = size - 1;
while (bytes_to_recv) { len = bytes_to_recv > DP_AUX_MAX_PAYLOAD_BYTES ?
diff --git a/include/drm/drm_dp_helper.h
b/include/drm/drm_dp_helper.h
index edffd1dcca3e..3b42392394ba 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -1388,7 +1388,7 @@ enum drm_dp_phy { #define DP_HDCP_2_2_LC_INIT_OFFSET DP_HDCP_2_2_REG_RN_OFFSET #define DP_HDCP_2_2_LC_SEND_LPRIME_OFFSET DP_HDCP_2_2_REG_LPRIME_OFFSET #define DP_HDCP_2_2_SKE_SEND_EKS_OFFSET DP_HDCP_2_2_REG_EDKEY_KS_OFFSET -#define DP_HDCP_2_2_REP_SEND_RECVID_LIST_OFFSET DP_HDCP_2_2_REG_RXINFO_OFFSET +#define DP_HDCP_2_2_REP_SEND_RECVID_LIST_OFFSET DP_HDCP_2_2_REG_SEQ_NUM_V_OFFSET #define DP_HDCP_2_2_REP_SEND_ACK_OFFSET DP_HDCP_2_2_REG_V_OFFSET #define DP_HDCP_2_2_REP_STREAM_MANAGE_OFFSET DP_HDCP_2_2_REG_SEQ_NUM_M_OFFSET #define DP_HDCP_2_2_REP_STREAM_READY_OFFSET DP_HDCP_2_2_REG_MPRIME_OFFSET -- 2.29.2