From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 229F1C433E1 for ; Mon, 10 Aug 2020 19:09:56 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id EC411221E2 for ; Mon, 10 Aug 2020 19:09:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="2uwIo6NS" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EC411221E2 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=amd-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 3402589FFD; Mon, 10 Aug 2020 19:09:54 +0000 (UTC) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by gabe.freedesktop.org (Postfix) with ESMTPS id 8F7C789FCA; Mon, 10 Aug 2020 19:09:51 +0000 (UTC) Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4C2B622CF6; Mon, 10 Aug 2020 19:09:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597086591; bh=4Abc2RcV96zkWCXOb26k7nxJQ2yw3b6kMzMkLIEkKJ0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=2uwIo6NS4OcptriF5OXcCmOUqzmp3cEqXq0dlPH/KPYyMK7IDgVhMrzuHIs5581T9 ZBGcXr9FvjxBwv2u/5P0nXdYILThHhbIQC6k3waljGCAbuUhVtvpPQuy92TQFi0zYi i67TjOGzvHwkR1FrMPGQETGeECAGf6BU5YmfAG+w= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH AUTOSEL 5.8 38/64] drm/amd/display: allow query ddc data over aux to be read only operation Date: Mon, 10 Aug 2020 15:08:33 -0400 Message-Id: <20200810190859.3793319-38-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200810190859.3793319-1-sashal@kernel.org> References: <20200810190859.3793319-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sasha Levin , Wenjing Liu , Rodrigo Siqueira , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Alex Deucher , Jun Lei Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" From: Wenjing Liu [ Upstream commit 26b4750d6cf84cb2b3f0a84c9b345e7b71886410 ] [why] Two issues: 1. Add read only operation support for query ddc data over aux. 2. Fix a bug where if read size is multiple of 16, mot of the last read transaction will not be set to 0. Signed-off-by: Wenjing Liu Reviewed-by: Jun Lei Acked-by: Rodrigo Siqueira Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- .../gpu/drm/amd/display/dc/core/dc_link_ddc.c | 29 ++++++++++++------- 1 file changed, 18 insertions(+), 11 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 aefd29a440b52..be8f265976b09 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 @@ -503,7 +503,7 @@ bool dal_ddc_service_query_ddc_data( uint8_t *read_buf, uint32_t read_size) { - bool ret = false; + bool success = true; uint32_t payload_size = dal_ddc_service_is_in_aux_transaction_mode(ddc) ? DEFAULT_AUX_MAX_DATA_SIZE : EDID_SEGMENT_SIZE; @@ -527,7 +527,6 @@ bool dal_ddc_service_query_ddc_data( * but we want to read 256 over i2c!!!!*/ if (dal_ddc_service_is_in_aux_transaction_mode(ddc)) { struct aux_payload payload; - bool read_available = true; payload.i2c_over_aux = true; payload.address = address; @@ -536,21 +535,26 @@ bool dal_ddc_service_query_ddc_data( if (write_size != 0) { payload.write = true; - payload.mot = false; + /* should not set mot (middle of transaction) to 0 + * if there are pending read payloads + */ + payload.mot = read_size == 0 ? false : true; payload.length = write_size; payload.data = write_buf; - ret = dal_ddc_submit_aux_command(ddc, &payload); - read_available = ret; + success = dal_ddc_submit_aux_command(ddc, &payload); } - if (read_size != 0 && read_available) { + if (read_size != 0 && success) { payload.write = false; + /* should set mot (middle of transaction) to 0 + * since it is the last payload to send + */ payload.mot = false; payload.length = read_size; payload.data = read_buf; - ret = dal_ddc_submit_aux_command(ddc, &payload); + success = dal_ddc_submit_aux_command(ddc, &payload); } } else { struct i2c_command command = {0}; @@ -573,7 +577,7 @@ bool dal_ddc_service_query_ddc_data( command.number_of_payloads = dal_ddc_i2c_payloads_get_count(&payloads); - ret = dm_helpers_submit_i2c( + success = dm_helpers_submit_i2c( ddc->ctx, ddc->link, &command); @@ -581,7 +585,7 @@ bool dal_ddc_service_query_ddc_data( dal_ddc_i2c_payloads_destroy(&payloads); } - return ret; + return success; } bool dal_ddc_submit_aux_command(struct ddc_service *ddc, @@ -598,7 +602,7 @@ bool dal_ddc_submit_aux_command(struct ddc_service *ddc, do { struct aux_payload current_payload; - bool is_end_of_payload = (retrieved + DEFAULT_AUX_MAX_DATA_SIZE) > + bool is_end_of_payload = (retrieved + DEFAULT_AUX_MAX_DATA_SIZE) >= payload->length; current_payload.address = payload->address; @@ -607,7 +611,10 @@ bool dal_ddc_submit_aux_command(struct ddc_service *ddc, 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 = !is_end_of_payload; + /* set mot (middle of transaction) to false + * if it is the last payload + */ + current_payload.mot = is_end_of_payload ? payload->mot:true; current_payload.reply = payload->reply; current_payload.write = payload->write; -- 2.25.1 _______________________________________________ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx