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=-7.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,UNWANTED_LANGUAGE_BODY,USER_AGENT_GIT autolearn=unavailable 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 98F22C10F29 for ; Mon, 16 Mar 2020 02:34:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6E85F206EB for ; Mon, 16 Mar 2020 02:34:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584326059; bh=R9Zg3BZuq8xXCD2pKaZIxwK+qNJmdOsTsf8VDK1m7VU=; h=From:To:Cc:Subject:Date:List-ID:From; b=NW+Bahcfy9i4QqU5rVPrkvqRva6f/NuHdjnufaMAHBLViJL5sVH2tiC7Im/t+PwbC DmteUFok5DRBrFLhsArjVjB+m2P7JCNgOkgWeOy8F1fVNXH7B/KpC9DwaomkY3iZdI bafhBM5yi4nYL0eq2upTwfA/iwXk/ylKd6RbNvIw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729800AbgCPCeR (ORCPT ); Sun, 15 Mar 2020 22:34:17 -0400 Received: from mail.kernel.org ([198.145.29.99]:37468 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729412AbgCPCeO (ORCPT ); Sun, 15 Mar 2020 22:34:14 -0400 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 4DA2C206E9; Mon, 16 Mar 2020 02:34:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584326053; bh=R9Zg3BZuq8xXCD2pKaZIxwK+qNJmdOsTsf8VDK1m7VU=; h=From:To:Cc:Subject:Date:From; b=iB9mTEmnWwriGjkDe0T++58PUuq8KEeBMVA35wo5brYcxlHjjodXAryBK4zvr317h s6tQ/dbD9VI2uzNJsLXbfI4XQp2KSCnfsHkcy/XyNL0TQblp2uQMA4XdgstGsljkuy jsJ8rFt7HCMjQes0U5+WEsHB7WScJb9GS4sd/aE8= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Vignesh Raghavendra , Mark Brown , Sasha Levin , linux-spi@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 01/35] spi: spi-omap2-mcspi: Handle DMA size restriction on AM65x Date: Sun, 15 Mar 2020 22:33:37 -0400 Message-Id: <20200316023411.1263-1-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Vignesh Raghavendra [ Upstream commit e4e8276a4f652be2c7bb783a0155d4adb85f5d7d ] On AM654, McSPI can only support 4K - 1 bytes per transfer when DMA is enabled. Therefore populate master->max_transfer_size callback to inform client drivers of this restriction when DMA channels are available. Signed-off-by: Vignesh Raghavendra Link: https://lore.kernel.org/r/20200204124816.16735-2-vigneshr@ti.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/spi/spi-omap2-mcspi.c | 26 +++++++++++++++++++ include/linux/platform_data/spi-omap2-mcspi.h | 1 + 2 files changed, 27 insertions(+) diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c index 848e03e5f42d5..8e435da730996 100644 --- a/drivers/spi/spi-omap2-mcspi.c +++ b/drivers/spi/spi-omap2-mcspi.c @@ -130,6 +130,7 @@ struct omap2_mcspi { int fifo_depth; bool slave_aborted; unsigned int pin_dir:1; + size_t max_xfer_len; }; struct omap2_mcspi_cs { @@ -1316,6 +1317,18 @@ static bool omap2_mcspi_can_dma(struct spi_master *master, return (xfer->len >= DMA_MIN_BYTES); } +static size_t omap2_mcspi_max_xfer_size(struct spi_device *spi) +{ + struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master); + struct omap2_mcspi_dma *mcspi_dma = + &mcspi->dma_channels[spi->chip_select]; + + if (mcspi->max_xfer_len && mcspi_dma->dma_rx) + return mcspi->max_xfer_len; + + return SIZE_MAX; +} + static int omap2_mcspi_controller_setup(struct omap2_mcspi *mcspi) { struct spi_master *master = mcspi->master; @@ -1384,6 +1397,11 @@ static struct omap2_mcspi_platform_config omap4_pdata = { .regs_offset = OMAP4_MCSPI_REG_OFFSET, }; +static struct omap2_mcspi_platform_config am654_pdata = { + .regs_offset = OMAP4_MCSPI_REG_OFFSET, + .max_xfer_len = SZ_4K - 1, +}; + static const struct of_device_id omap_mcspi_of_match[] = { { .compatible = "ti,omap2-mcspi", @@ -1393,6 +1411,10 @@ static const struct of_device_id omap_mcspi_of_match[] = { .compatible = "ti,omap4-mcspi", .data = &omap4_pdata, }, + { + .compatible = "ti,am654-mcspi", + .data = &am654_pdata, + }, { }, }; MODULE_DEVICE_TABLE(of, omap_mcspi_of_match); @@ -1450,6 +1472,10 @@ static int omap2_mcspi_probe(struct platform_device *pdev) mcspi->pin_dir = pdata->pin_dir; } regs_offset = pdata->regs_offset; + if (pdata->max_xfer_len) { + mcspi->max_xfer_len = pdata->max_xfer_len; + master->max_transfer_size = omap2_mcspi_max_xfer_size; + } r = platform_get_resource(pdev, IORESOURCE_MEM, 0); mcspi->base = devm_ioremap_resource(&pdev->dev, r); diff --git a/include/linux/platform_data/spi-omap2-mcspi.h b/include/linux/platform_data/spi-omap2-mcspi.h index 0bf9fddb83064..3b400b1919a9b 100644 --- a/include/linux/platform_data/spi-omap2-mcspi.h +++ b/include/linux/platform_data/spi-omap2-mcspi.h @@ -11,6 +11,7 @@ struct omap2_mcspi_platform_config { unsigned short num_cs; unsigned int regs_offset; unsigned int pin_dir:1; + size_t max_xfer_len; }; struct omap2_mcspi_device_config { -- 2.20.1