From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752874AbdDNIXB (ORCPT ); Fri, 14 Apr 2017 04:23:01 -0400 Received: from mail.free-electrons.com ([62.4.15.54]:41177 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752703AbdDNIW5 (ORCPT ); Fri, 14 Apr 2017 04:22:57 -0400 From: Quentin Schulz To: nicolas.ferre@microchip.com, broonie@kernel.org Cc: Quentin Schulz , linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, alexandre.belloni@free-electrons.com, thomas.petazzoni@free-electrons.com Subject: [PATCH 2/2] spi: atmel: add deepest PM support to SAMA5D2 Date: Fri, 14 Apr 2017 10:22:43 +0200 Message-Id: <20170414082243.23002-2-quentin.schulz@free-electrons.com> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20170414082243.23002-1-quentin.schulz@free-electrons.com> References: <20170414082243.23002-1-quentin.schulz@free-electrons.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This adds deepest (Backup+Self-Refresh) PM support to the ATMEL SAMA5D2 SoC's SPI controller. When resuming from deepest state, it is required to restore MR register as the registers are lost since VDD core has been shut down when entering deepest state on the SAMA5D2. Signed-off-by: Quentin Schulz --- v2: - fix commit log explanation on why restoring the registers is required after resuming from deepest state, drivers/spi/spi-atmel.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c index 247d920..1eb83c9 100644 --- a/drivers/spi/spi-atmel.c +++ b/drivers/spi/spi-atmel.c @@ -1702,8 +1702,17 @@ static int atmel_spi_suspend(struct device *dev) static int atmel_spi_resume(struct device *dev) { struct spi_master *master = dev_get_drvdata(dev); + struct atmel_spi *as = spi_master_get_devdata(master); int ret; + ret = clk_prepare_enable(as->clk); + if (ret) + return ret; + + atmel_spi_init(as); + + clk_disable_unprepare(as->clk); + if (!pm_runtime_suspended(dev)) { ret = atmel_spi_runtime_resume(dev); if (ret) -- 2.9.3