From: Lewis Huang <lewis.hu...@amd.com> [Why] When user mode use i2c over aux through ADL or DDI, the function dal_ddc_service_query_ddc_data will be called. There are two issues.
1. When read/write length > 16byte, current always return false because the DEFAULT_AUX_MAX_DATA_SIZE != length. 2. When usermode only need to read data through i2c, driver will write mot = true at the same address and cause i2c sink confused. Therefore the following read command will get garbage. [How] 1. Add function dal_dcc_submit_aux_command to handle length > 16 byte. 2. Check read size and write size when query ddc data. Signed-off-by: Lewis Huang <lewis.hu...@amd.com> Reviewed-by: Charlene Liu <charlene....@amd.com> Acked-by: Bhawanpreet Lakha <bhawanpreet.la...@amd.com> --- .../gpu/drm/amd/display/dc/core/dc_link_ddc.c | 87 +++++++++++++------ .../gpu/drm/amd/display/dc/inc/dc_link_ddc.h | 3 + 2 files changed, 63 insertions(+), 27 deletions(-) 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 7fd2d1358f1b..f70137d67c82 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 @@ -494,7 +494,7 @@ bool dal_ddc_service_query_ddc_data( uint8_t *read_buf, uint32_t read_size) { - bool ret; + bool ret = false; uint32_t payload_size = dal_ddc_service_is_in_aux_transaction_mode(ddc) ? DEFAULT_AUX_MAX_DATA_SIZE : EDID_SEGMENT_SIZE; @@ -513,34 +513,32 @@ bool dal_ddc_service_query_ddc_data( /*TODO: len of payload data for i2c and aux is uint8!!!!, * but we want to read 256 over i2c!!!!*/ if (dal_ddc_service_is_in_aux_transaction_mode(ddc)) { - struct aux_payload write_payload = { - .i2c_over_aux = true, - .write = true, - .mot = true, - .address = address, - .length = write_size, - .data = write_buf, - .reply = NULL, - .defer_delay = get_defer_delay(ddc), - }; - - struct aux_payload read_payload = { - .i2c_over_aux = true, - .write = false, - .mot = false, - .address = address, - .length = read_size, - .data = read_buf, - .reply = NULL, - .defer_delay = get_defer_delay(ddc), - }; - - ret = dc_link_aux_transfer_with_retries(ddc, &write_payload); + struct aux_payload payload; + bool read_available = true; + + payload.i2c_over_aux = true; + payload.address = address; + payload.reply = NULL; + payload.defer_delay = get_defer_delay(ddc); + + if (write_size != 0) { + payload.write = true; + payload.mot = true; + payload.length = write_size; + payload.data = write_buf; + + ret = dal_ddc_submit_aux_command(ddc, &payload); + read_available = ret; + } - if (!ret) - return false; + if (read_size != 0 && read_available) { + payload.write = false; + payload.mot = false; + payload.length = read_size; + payload.data = read_buf; - ret = dc_link_aux_transfer_with_retries(ddc, &read_payload); + ret = dal_ddc_submit_aux_command(ddc, &payload); + } } else { struct i2c_payloads *payloads = dal_ddc_i2c_payloads_create(ddc->ctx, payloads_num); @@ -571,6 +569,41 @@ bool dal_ddc_service_query_ddc_data( return ret; } +bool dal_ddc_submit_aux_command(struct ddc_service *ddc, + struct aux_payload *payload) +{ + uint8_t retrieved = 0; + bool ret = 0; + + if (!ddc) + return false; + + if (!payload) + return false; + + do { + struct aux_payload current_payload; + bool is_end_of_payload = (retrieved + DEFAULT_AUX_MAX_DATA_SIZE) > + payload->length ? true : false; + + current_payload.address = payload->address; + current_payload.data = &payload->data[retrieved]; + current_payload.defer_delay = payload->defer_delay; + current_payload.i2c_over_aux = payload->i2c_over_aux; + current_payload.length = is_end_of_payload ? + payload->length - retrieved : DEFAULT_AUX_MAX_DATA_SIZE; + current_payload.mot = payload->mot ? payload->mot : !is_end_of_payload; + current_payload.reply = payload->reply; + current_payload.write = payload->write; + + ret = dc_link_aux_transfer_with_retries(ddc, ¤t_payload); + + retrieved += current_payload.length; + } while (retrieved < payload->length && ret == true); + + return ret; +} + /* 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 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 b1fab251c09b..7d35d03a2d43 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 @@ -95,6 +95,9 @@ bool dal_ddc_service_query_ddc_data( uint8_t *read_buf, uint32_t read_size); +bool dal_ddc_submit_aux_command(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); -- 2.17.1 _______________________________________________ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx