From cc195141133ac3e767d930bedd8294ceebf1f10b Mon Sep 17 00:00:00 2001 From: Shirish S Date: Fri, 23 Feb 2018 16:10:13 +0530 Subject: [PATCH] drm/amd/display: make dm_dp_aux_transfer return payload bytes instead of size The drm layer expects aux->transfer() to return the payload bytes read. Currently dm_dp_aux_transfer() returns the payload size which does not gets updated during the read, hence not giving the right data for the drm layer to pars edid. This leads to the drm layer to conclude as the edid is BAD and hence some monitors/devices dont get detected properly. This patch changes the return type of dm_dp_aux_transfer() to actual bytes read during DP_AUX_NATIVE_READ & DP_AUX_I2C_READ. Signed-off-by: Shirish S Reviewed-by: Harry Wentland Signed-off-by: Alex Deucher --- .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 9 +++++---- drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c | 7 ++++--- drivers/gpu/drm/amd/display/dc/i2caux/aux_engine.c | 15 ++------------- drivers/gpu/drm/amd/display/dc/i2caux/i2caux.c | 1 + drivers/gpu/drm/amd/display/dc/inc/dc_link_ddc.h | 2 +- 5 files changed, 13 insertions(+), 21 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 1e8a21b67df7..39cfe0fbf1b9 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 @@ -83,17 +83,18 @@ static ssize_t dm_dp_aux_transfer(struct drm_dp_aux *aux, enum i2c_mot_mode mot = (msg->request & DP_AUX_I2C_MOT) ? I2C_MOT_TRUE : I2C_MOT_FALSE; enum ddc_result res; + ssize_t read_bytes; switch (msg->request & ~DP_AUX_I2C_MOT) { case DP_AUX_NATIVE_READ: - res = dal_ddc_service_read_dpcd_data( + read_bytes = dal_ddc_service_read_dpcd_data( TO_DM_AUX(aux)->ddc_service, false, I2C_MOT_UNDEF, msg->address, msg->buffer, msg->size); - break; + return read_bytes; case DP_AUX_NATIVE_WRITE: res = dal_ddc_service_write_dpcd_data( TO_DM_AUX(aux)->ddc_service, @@ -104,14 +105,14 @@ static ssize_t dm_dp_aux_transfer(struct drm_dp_aux *aux, msg->size); break; case DP_AUX_I2C_READ: - res = dal_ddc_service_read_dpcd_data( + read_bytes = dal_ddc_service_read_dpcd_data( TO_DM_AUX(aux)->ddc_service, true, mot, msg->address, msg->buffer, msg->size); - break; + return read_bytes; case DP_AUX_I2C_WRITE: res = dal_ddc_service_write_dpcd_data( TO_DM_AUX(aux)->ddc_service, 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 d5294798b0a5..49c2face1e7a 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 @@ -629,7 +629,7 @@ bool dal_ddc_service_query_ddc_data( return ret; } -enum ddc_result dal_ddc_service_read_dpcd_data( +ssize_t dal_ddc_service_read_dpcd_data( struct ddc_service *ddc, bool i2c, enum i2c_mot_mode mot, @@ -660,8 +660,9 @@ enum ddc_result dal_ddc_service_read_dpcd_data( if (dal_i2caux_submit_aux_command( ddc->ctx->i2caux, ddc->ddc_pin, - &command)) - return DDC_RESULT_SUCESSFULL; + &command)) { + return (ssize_t)command.payloads->length; + } return DDC_RESULT_FAILED_OPERATION; } diff --git a/drivers/gpu/drm/amd/display/dc/i2caux/aux_engine.c b/drivers/gpu/drm/amd/display/dc/i2caux/aux_engine.c index 0b1db48fef36..9c42fe5a0f27 100644 --- a/drivers/gpu/drm/amd/display/dc/i2caux/aux_engine.c +++ b/drivers/gpu/drm/amd/display/dc/i2caux/aux_engine.c @@ -126,20 +126,8 @@ static void process_read_reply( ctx->status = I2CAUX_TRANSACTION_STATUS_FAILED_PROTOCOL_ERROR; ctx->operation_succeeded = false; - } else if (ctx->returned_byte < ctx->current_read_length) { - ctx->current_read_length -= ctx->returned_byte; - - ctx->offset += ctx->returned_byte; - - ++ctx->invalid_reply_retry_aux_on_ack; - - if (ctx->invalid_reply_retry_aux_on_ack > - AUX_INVALID_REPLY_RETRY_COUNTER) { - ctx->status = - I2CAUX_TRANSACTION_STATUS_FAILED_PROTOCOL_ERROR; - ctx->operation_succeeded = false; - } } else { + ctx->current_read_length = ctx->returned_byte; ctx->status = I2CAUX_TRANSACTION_STATUS_SUCCEEDED; ctx->transaction_complete = true; ctx->operation_succeeded = true; @@ -292,6 +280,7 @@ static bool read_command( ctx.operation_succeeded); } + request->payload.length = ctx.reply.length; return ctx.operation_succeeded; } diff --git a/drivers/gpu/drm/amd/display/dc/i2caux/i2caux.c b/drivers/gpu/drm/amd/display/dc/i2caux/i2caux.c index e1593ffe5a2b..5cbf6626b8d4 100644 --- a/drivers/gpu/drm/amd/display/dc/i2caux/i2caux.c +++ b/drivers/gpu/drm/amd/display/dc/i2caux/i2caux.c @@ -253,6 +253,7 @@ bool dal_i2caux_submit_aux_command( break; } + cmd->payloads->length = request.payload.length; ++index_of_payload; } 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 0bf73b742f1f..090b7a8dd67b 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 @@ -102,7 +102,7 @@ bool dal_ddc_service_query_ddc_data( uint8_t *read_buf, uint32_t read_size); -enum ddc_result dal_ddc_service_read_dpcd_data( +ssize_t dal_ddc_service_read_dpcd_data( struct ddc_service *ddc, bool i2c, enum i2c_mot_mode mot, -- 2.11.0