From patchwork Sun Sep 20 11:28:50 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 258199 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=-9.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED 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 17AA1C43463 for ; Sun, 20 Sep 2020 11:31:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E17CF206E5 for ; Sun, 20 Sep 2020 11:31:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726311AbgITLbT (ORCPT ); Sun, 20 Sep 2020 07:31:19 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:53648 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726316AbgITL33 (ORCPT ); Sun, 20 Sep 2020 07:29:29 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id 791FF8001384; Sun, 20 Sep 2020 11:29:26 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id MXQmI7nk4Ji1; Sun, 20 Sep 2020 14:29:25 +0300 (MSK) From: Serge Semin To: Mark Brown CC: Serge Semin , Serge Semin , Alexey Malahov , Ramil Zaripov , Pavel Parkhomenko , Andy Shevchenko , Andy Shevchenko , Lars Povlsen , "wuxu . wu" , Feng Tang , Rob Herring , , , Subject: [PATCH 06/30] spi: dw: Disable all IRQs when controller is unused Date: Sun, 20 Sep 2020 14:28:50 +0300 Message-ID: <20200920112914.26501-7-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200920112914.26501-1-Sergey.Semin@baikalelectronics.ru> References: <20200920112914.26501-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org It's a good practice to disable all IRQs if a device is fully unused. In our case it is supposed to be done before requesting the IRQ and after the last byte of an SPI transfer is received. In the former case it's required to prevent the IRQ handler invocation before the driver data is fully initialized (which may happen if the IRQs status has been left uncleared before the device is probed). So we just moved the spi_hw_init() method invocation to the earlier stage before requesting the IRQ. In the later case there is just no point in having any of the IRQs enabled between SPI transfers and when there is no SPI message currently being processed. Signed-off-by: Serge Semin --- drivers/spi/spi-dw-core.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c index 18411f5b9954..be94ed5bb896 100644 --- a/drivers/spi/spi-dw-core.c +++ b/drivers/spi/spi-dw-core.c @@ -198,7 +198,7 @@ static irqreturn_t interrupt_transfer(struct dw_spi *dws) dw_reader(dws); if (dws->rx_end == dws->rx) { - spi_mask_intr(dws, SPI_INT_TXEI); + spi_mask_intr(dws, 0xff); spi_finalize_current_transfer(dws->master); return IRQ_HANDLED; } @@ -222,7 +222,7 @@ static irqreturn_t dw_spi_irq(int irq, void *dev_id) return IRQ_NONE; if (!master->cur_msg) { - spi_mask_intr(dws, SPI_INT_TXEI); + spi_mask_intr(dws, 0xff); return IRQ_HANDLED; } @@ -458,6 +458,9 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws) spi_controller_set_devdata(master, dws); + /* Basic HW init */ + spi_hw_init(dev, dws); + ret = request_irq(dws->irq, dw_spi_irq, IRQF_SHARED, dev_name(dev), master); if (ret < 0) { @@ -485,9 +488,6 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws) device_property_read_u32(dev, "rx-sample-delay-ns", &dws->def_rx_sample_dly_ns); - /* Basic HW init */ - spi_hw_init(dev, dws); - if (dws->dma_ops && dws->dma_ops->dma_init) { ret = dws->dma_ops->dma_init(dev, dws); if (ret) {