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Wed, 21 Oct 2026 06:22:36 -0700 Received: from nvidia.com (10.127.8.14) by mail.nvidia.com (10.129.68.9) with Microsoft SMTP Server id 15.2.2562.49 via Frontend Transport; Wed, 21 Oct 2026 06:22:35 -0700 Date: Tue, 18 Aug 2026 14:54:42 +0000 Subject: [PATCH 2/5] spi: tegra114: Run per-transfer delay before ending the transfer From: Vishwaroop A Message-ID: <179258895296.403962.9495742918567488970@nvidia.com> In-Reply-To: <179258895296.403962.3492255118456900623@nvidia.com> References: <179258895296.403962.3492255118456900623@nvidia.com> To: Mark Brown , CC: Laxman Dewangan , Thierry Reding , Jonathan Hunter , "Sowjanya Komatineni" , Rhyland Klein , Suresh Mangipudi , Krishna Yarlagadda , Vishwaroop A , , X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY8PEPF00000055:EE_|PH7PR12MB6537:EE_ X-MS-Office365-Filtering-Correlation-Id: 0ccd813c-8f67-4acd-5c2a-08df2f766dc6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|376014|1800799024|82310400026|36860700016|11063799006|56012099006|261009223327099003|261009221227099003|261009220027099003|10067099003|261009221727099003|261009223027099003|22082099003|18002099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: DY5qYpuUEY+IjbbwgOgaL1GCg0JOEiDE0FBc6jfCAkyiR98QnT4cImDZf/+1rpW+CJCDsqZkwoC4ihTlLyYdXKGx3bWw40ZqHlCgbqiegDos98xKIyp5sqrIDb8roZIOyTCRDtfcUNyx/XEuYCjtXMIG91bQergbIbONSQIo0NC0FXM5zq07AxGBYKOoUFMkC9/uN87CS/81eH3NCpcv47RyiZvfjbFIcWFNTUTbEY0rs17sEJWpS6Gf1q5ZdN0Ry9T5OfFGl+vISiQ0bJ4ipnkqYlUDg8H50D1z4TpuPqmvT8ACAhDaF7J8B0Kws+rzU/C5wRHmEhqzcg2g6Enp7/WLEoLcqVqALyZjwE4ejtUNddFfebrXPeSCFlaxoEfR3ibuEdviFn5Mu/e0LB8+LiO2Epj9QFCkfUPiJuAwn3a6qWjyFDsMOeD+XNhWlNNF X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Oct 2026 13:23:00.3136 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0ccd813c-8f67-4acd-5c2a-08df2f766dc6 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CY8PEPF00000055.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB6537 This driver implements transfer_one_message(), so it must follow the SPI core sequence for the per-transfer delay: spi_transfer->delay is the settle time after the transfer completes and must elapse while CS is still asserted, before CS is deasserted. The current sequence deasserts CS via tegra_spi_transfer_end() and only then runs spi_transfer_delay_exec(), which drops the delay to after CS has already gone inactive. Run the delay first on the paths that drop CS. Fixes: f4fade12d506 ("spi/tegra114: Correct support for cs_change") Signed-off-by: Vishwaroop A --- drivers/spi/spi-tegra114.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c index f9bd783cb4dc..d1118f1f2cb3 100644 --- a/drivers/spi/spi-tegra114.c +++ b/drivers/spi/spi-tegra114.c @@ -1096,20 +1096,20 @@ static int tegra_spi_transfer_one_message(struct spi_controller *host, complete_xfer: if (ret < 0 || skip) { - tegra_spi_transfer_end(spi); spi_transfer_delay_exec(xfer); + tegra_spi_transfer_end(spi); goto exit; } else if (list_is_last(&xfer->transfer_list, &msg->transfers)) { if (xfer->cs_change) tspi->cs_control = spi; else { - tegra_spi_transfer_end(spi); spi_transfer_delay_exec(xfer); + tegra_spi_transfer_end(spi); } } else if (xfer->cs_change) { - tegra_spi_transfer_end(spi); spi_transfer_delay_exec(xfer); + tegra_spi_transfer_end(spi); } } -- 2.17.1