diff options
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 21 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c | 22 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dce/dce_aux.c | 115 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dce/dce_aux.h | 5 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/inc/dc_link_ddc.h | 5 |
5 files changed, 129 insertions, 39 deletions
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c index c4ea3a91f17a..6e205ee36ac3 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c @@ -84,6 +84,7 @@ static ssize_t dm_dp_aux_transfer(struct drm_dp_aux *aux, { ssize_t result = 0; struct aux_payload payload; + enum aux_channel_operation_result operation_result; if (WARN_ON(msg->size > 16)) return -E2BIG; @@ -97,13 +98,27 @@ static ssize_t dm_dp_aux_transfer(struct drm_dp_aux *aux, payload.mot = (msg->request & DP_AUX_I2C_MOT) != 0; payload.defer_delay = 0; - result = dc_link_aux_transfer(TO_DM_AUX(aux)->ddc_service, &payload); + result = dc_link_aux_transfer_raw(TO_DM_AUX(aux)->ddc_service, &payload, + &operation_result); if (payload.write) result = msg->size; - if (result < 0) /* DC doesn't know about kernel error codes */ - result = -EIO; + if (result < 0) + switch (operation_result) { + case AUX_CHANNEL_OPERATION_SUCCEEDED: + break; + case AUX_CHANNEL_OPERATION_FAILED_HPD_DISCON: + case AUX_CHANNEL_OPERATION_FAILED_REASON_UNKNOWN: + result = -EIO; + break; + case AUX_CHANNEL_OPERATION_FAILED_INVALID_REPLY: + result = -EBUSY; + break; + case AUX_CHANNEL_OPERATION_FAILED_TIMEOUT: + result = -ETIMEDOUT; + break; + } return result; } diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c index b7ee63cd8dc7..f02092a0dc76 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c @@ -573,12 +573,28 @@ bool dal_ddc_service_query_ddc_data( return ret; } -int dc_link_aux_transfer(struct ddc_service *ddc, - struct aux_payload *payload) +/* dc_link_aux_transfer_raw() - Attempt to transfer + * the given aux payload. This function does not perform + * retries or handle error states. The reply is returned + * in the payload->reply and the result through + * *operation_result. Returns the number of bytes transferred, + * or -1 on a failure. + */ +int dc_link_aux_transfer_raw(struct ddc_service *ddc, + struct aux_payload *payload, + enum aux_channel_operation_result *operation_result) { - return dce_aux_transfer(ddc, payload); + return dce_aux_transfer_raw(ddc, payload, operation_result); } +/* dc_link_aux_transfer_with_retries() - Attempt to submit an + * aux payload, retrying on timeouts, defers, and busy states + * as outlined in the DP spec. Returns true if the request + * was successful. + * + * Unless you want to implement your own retry semantics, this + * is probably the one you want. + */ bool dc_link_aux_transfer_with_retries(struct ddc_service *ddc, struct aux_payload *payload) { diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c index 2f50be33ab15..65b290d80143 100644 --- a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c +++ b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c @@ -438,12 +438,12 @@ static enum i2caux_transaction_action i2caux_action_from_payload(struct aux_payl return I2CAUX_TRANSACTION_ACTION_DP_READ; } -int dce_aux_transfer(struct ddc_service *ddc, - struct aux_payload *payload) +int dce_aux_transfer_raw(struct ddc_service *ddc, + struct aux_payload *payload, + enum aux_channel_operation_result *operation_result) { struct ddc *ddc_pin = ddc->ddc_pin; struct dce_aux *aux_engine; - enum aux_channel_operation_result operation_result; struct aux_request_transaction_data aux_req; struct aux_reply_transaction_data aux_rep; uint8_t returned_bytes = 0; @@ -470,28 +470,26 @@ int dce_aux_transfer(struct ddc_service *ddc, aux_req.data = payload->data; submit_channel_request(aux_engine, &aux_req); - operation_result = get_channel_status(aux_engine, &returned_bytes); - - switch (operation_result) { - case AUX_CHANNEL_OPERATION_SUCCEEDED: - res = read_channel_reply(aux_engine, payload->length, - payload->data, payload->reply, - &status); - break; - case AUX_CHANNEL_OPERATION_FAILED_HPD_DISCON: - res = 0; - break; - case AUX_CHANNEL_OPERATION_FAILED_REASON_UNKNOWN: - case AUX_CHANNEL_OPERATION_FAILED_INVALID_REPLY: - case AUX_CHANNEL_OPERATION_FAILED_TIMEOUT: + *operation_result = get_channel_status(aux_engine, &returned_bytes); + + if (*operation_result == AUX_CHANNEL_OPERATION_SUCCEEDED) { + read_channel_reply(aux_engine, payload->length, + payload->data, payload->reply, + &status); + res = returned_bytes; + } else { res = -1; - break; } + release_engine(aux_engine); return res; } -#define AUX_RETRY_MAX 7 +#define AUX_MAX_RETRIES 7 +#define AUX_MAX_DEFER_RETRIES 7 +#define AUX_MAX_I2C_DEFER_RETRIES 7 +#define AUX_MAX_INVALID_REPLY_RETRIES 2 +#define AUX_MAX_TIMEOUT_RETRIES 3 bool dce_aux_transfer_with_retries(struct ddc_service *ddc, struct aux_payload *payload) @@ -499,24 +497,83 @@ bool dce_aux_transfer_with_retries(struct ddc_service *ddc, int i, ret = 0; uint8_t reply; bool payload_reply = true; + enum aux_channel_operation_result operation_result; + int aux_ack_retries = 0, + aux_defer_retries = 0, + aux_i2c_defer_retries = 0, + aux_timeout_retries = 0, + aux_invalid_reply_retries = 0; if (!payload->reply) { payload_reply = false; payload->reply = &reply; } - for (i = 0; i < AUX_RETRY_MAX; i++) { - ret = dce_aux_transfer(ddc, payload); - - if (ret >= 0) { - if (*payload->reply == 0) { - if (!payload_reply) - payload->reply = NULL; - return true; + for (i = 0; i < AUX_MAX_RETRIES; i++) { + ret = dce_aux_transfer_raw(ddc, payload, &operation_result); + switch (operation_result) { + case AUX_CHANNEL_OPERATION_SUCCEEDED: + aux_timeout_retries = 0; + aux_invalid_reply_retries = 0; + + switch (*payload->reply) { + case AUX_TRANSACTION_REPLY_AUX_ACK: + if (!payload->write && payload->length != ret) { + if (++aux_ack_retries >= AUX_MAX_RETRIES) + goto fail; + else + udelay(300); + } else + return true; + break; + + case AUX_TRANSACTION_REPLY_AUX_DEFER: + if (++aux_defer_retries >= AUX_MAX_DEFER_RETRIES) + goto fail; + break; + + case AUX_TRANSACTION_REPLY_I2C_DEFER: + aux_defer_retries = 0; + if (++aux_i2c_defer_retries >= AUX_MAX_I2C_DEFER_RETRIES) + goto fail; + break; + + case AUX_TRANSACTION_REPLY_AUX_NACK: + case AUX_TRANSACTION_REPLY_HPD_DISCON: + default: + goto fail; } - } + break; + + case AUX_CHANNEL_OPERATION_FAILED_INVALID_REPLY: + if (++aux_invalid_reply_retries >= AUX_MAX_INVALID_REPLY_RETRIES) + goto fail; + else + udelay(400); + break; + + case AUX_CHANNEL_OPERATION_FAILED_TIMEOUT: + if (++aux_timeout_retries >= AUX_MAX_TIMEOUT_RETRIES) + goto fail; + else { + /* + * DP 1.4, 2.8.2: AUX Transaction Response/Reply Timeouts + * According to the DP spec there should be 3 retries total + * with a 400us wait inbetween each. Hardware already waits + * for 550us therefore no wait is required here. + */ + } + break; - udelay(1000); + case AUX_CHANNEL_OPERATION_FAILED_HPD_DISCON: + case AUX_CHANNEL_OPERATION_FAILED_REASON_UNKNOWN: + default: + goto fail; + } } + +fail: + if (!payload_reply) + payload->reply = NULL; return false; } diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.h b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.h index d27f22c05e4b..aab5f0c34584 100644 --- a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.h +++ b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.h @@ -123,8 +123,9 @@ bool dce110_aux_engine_acquire( struct dce_aux *aux_engine, struct ddc *ddc); -int dce_aux_transfer(struct ddc_service *ddc, - struct aux_payload *cmd); +int dce_aux_transfer_raw(struct ddc_service *ddc, + struct aux_payload *cmd, + enum aux_channel_operation_result *operation_result); bool dce_aux_transfer_with_retries(struct ddc_service *ddc, struct aux_payload *cmd); diff --git a/drivers/gpu/drm/amd/display/dc/inc/dc_link_ddc.h b/drivers/gpu/drm/amd/display/dc/inc/dc_link_ddc.h index 16fd4dc6c4dd..b1fab251c09b 100644 --- a/drivers/gpu/drm/amd/display/dc/inc/dc_link_ddc.h +++ b/drivers/gpu/drm/amd/display/dc/inc/dc_link_ddc.h @@ -95,8 +95,9 @@ bool dal_ddc_service_query_ddc_data( uint8_t *read_buf, uint32_t read_size); -int dc_link_aux_transfer(struct ddc_service *ddc, - struct aux_payload *payload); +int dc_link_aux_transfer_raw(struct ddc_service *ddc, + struct aux_payload *payload, + enum aux_channel_operation_result *operation_result); bool dc_link_aux_transfer_with_retries(struct ddc_service *ddc, struct aux_payload *payload); |