From patchwork Sat Nov 7 08:13:52 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Damien Le Moal X-Patchwork-Id: 1396052 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=wdc.com Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=wdc.com header.i=@wdc.com header.a=rsa-sha256 header.s=dkim.wdc.com header.b=QshweGYe; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CSqmW5h4hz9sRR for ; Sat, 7 Nov 2020 19:14:35 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727970AbgKGIOf (ORCPT ); Sat, 7 Nov 2020 03:14:35 -0500 Received: from esa3.hgst.iphmx.com ([216.71.153.141]:57208 "EHLO esa3.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727833AbgKGIOe (ORCPT ); Sat, 7 Nov 2020 03:14:34 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1604736874; x=1636272874; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=aCvWQLDyaSFYntB4Womc0e0j3CRsIntIfbuSiFLr4hA=; b=QshweGYemJGcT+KkzovV5Pwo18pjWZTCW8g3u1CTCEdIBWJC7EJAcDdg DAImK8qOXPy+gVlzduQkc0P9q05LXvxzjG0oC91IP3dwDUOEfUMFo0wnv K+1WjPuBDcfsDLiRltK1GvqpTuFlqClk+5WjN3nWs+NuTMcwsiFAyMc8Z dYPIekGvygw5Rq73diPfYPDa3bJQ+XpIXgOyWRXZ1c4OpWgOeFrHudKUh uXmFqJDDaKlcm65v2/liCIjD6yEbhvClZe8iFGkfiBfZd08yEJJqo6r7G 1jH5hOzqc0YmU3jX9fwgBgTufIYiIbsmYFOC5hnM2dLWrBRH0rwDnyZeK Q==; IronPort-SDR: a5Xd+Se+25c2QTbWar5nszM6hEg8bzpP7QZXiBmHiIX8kiPd3tTKK8VILkOLnvRC6WH7Z9Ojdb /T37LvV7XUa5v2L3OD+Ubs/1cKoWX3q74tTHcmeCaGxRwFXrB2EnNPOygoTlByNO021/t2gOH5 QWuksXJOAZ+pFHjb2Rz80Flm+ZVkAOVCiKOuILn/x5aozS+OJni/exvdYmZxo5e1V6TrBbAkbo 2dkqE1fMksvzGrA8JcF3LVYdv8OMgjjHIof13xLct5pjoZPchIoBgJ5hOImAvKntDhkBaxbNfg m7A= X-IronPort-AV: E=Sophos;i="5.77,459,1596470400"; d="scan'208";a="156564364" Received: from h199-255-45-15.hgst.com (HELO uls-op-cesaep02.wdc.com) ([199.255.45.15]) by ob1.hgst.iphmx.com with ESMTP; 07 Nov 2020 16:14:34 +0800 IronPort-SDR: KAErByTJHniAColHyFeX8orwtASriU/MKROjO/z33lDVn5RRdECdUm4qmn1NXcgK4VTu/G7TPV 1DrFiinJCWe3OhCewJxavf7T+KqkyjRvANgYo93eR8u2SRzOAo2UhU18k1URgE46BBGzbaPHYj rsqIebwLqSTBxA0UyI6xJj5Hut/Bsavxt2wCUwPACNwu+Z2VE2OXfZR8XsPbLNDes/tzizo3XR jCR1Hob+BX5D06OIxeN4AHF8nDyuCoFIt+Jn9yHO8Q0tcm9aLQywPN5i1N7fYzAy+zmZQOC/DX qcA3xjArOwwbYAhEer/54hkA Received: from uls-op-cesaip01.wdc.com ([10.248.3.36]) by uls-op-cesaep02.wdc.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Nov 2020 23:59:25 -0800 IronPort-SDR: xnMAOU5B9k8aXLtf1hpdfpBLHr6sZSOKvHHBazK2i2wFWcv7QRgwZDB5yRurYFkmsx6Ckwu05/ WIME6Tf0b8tFqPDMJp7/bOJ2eMa/MWFmwTtlEgPFNFta0wWOqkFLFw+s9KUG4tiHjNQjPzfJzZ /Y+aqMbroxYK3YbaE0zZbN7MU/4qG8l2hqxL0GzsGZG88bgSljIGv2IlEe2BTxWw+VOgklowg5 t4NjYuQ2n8DxVap/Y0ZPa9osrcuQ405tsfj9NtcR3I/JsJDarohMqN/7Ix0DY0jcQmIqLh7HX+ nZg= WDCIronportException: Internal Received: from hdrdzf2.ad.shared (HELO twashi.fujisawa.hgst.com) ([10.84.71.85]) by uls-op-cesaip01.wdc.com with ESMTP; 07 Nov 2020 00:14:32 -0800 From: Damien Le Moal To: Palmer Dabbelt , linux-riscv@lists.infradead.org, Rob Herring , Frank Rowand , devicetree@vger.kernel.org, Serge Semin , Mark Brown , linux-spi@vger.kernel.org, Stephen Boyd , linux-clk@vger.kernel.org, Linus Walleij , linux-gpio@vger.kernel.org, Philipp Zabel Cc: Sean Anderson Subject: [PATCH 04/32] spi: dw: Introduce polling device tree property Date: Sat, 7 Nov 2020 17:13:52 +0900 Message-Id: <20201107081420.60325-5-damien.lemoal@wdc.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201107081420.60325-1-damien.lemoal@wdc.com> References: <20201107081420.60325-1-damien.lemoal@wdc.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org With boards that have slow interrupts context switch, and a fast device connected to a spi master, e.g. an SD card through mmc-spi, using dw_spi_poll_transfer() intead of the regular interrupt based dw_spi_transfer_handler() function is more efficient and can avoid a lot of RX FIFO overflow errors while keeping the device SPI frequency reasonnably high (for speed). Introduce the "polling" device tree property to allow requesting polled processing of transfer depending on the connected device while keeping the spi master interrupts property unschanged. E.g. device trees such as: Generic soc.dtsi dts: spi0: spi@53000000 { #address-cells = <1>; #size-cells = <0>; compatible = "snps,dw-apb-ssi"; reg = <0x53000000 0x100>; interrupts = <2>; ... } Board specific dts: ... &spi0 { polling; status = "okay"; slot@0 { compatible = "mmc-spi-slot"; reg = <0>; voltage-ranges = <3300 3300>; spi-max-frequency = <4000000>; }; } will result in using polled transfers for the SD card while other boards using spi0 for different peripherals can use interrupt based transfers without needing to change the generic base soc dts. Signed-off-by: Damien Le Moal --- drivers/spi/spi-dw-mmio.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/drivers/spi/spi-dw-mmio.c b/drivers/spi/spi-dw-mmio.c index d0cc5bf4fa4e..3f1bc384cb45 100644 --- a/drivers/spi/spi-dw-mmio.c +++ b/drivers/spi/spi-dw-mmio.c @@ -20,6 +20,7 @@ #include #include #include +#include #include "spi-dw.h" @@ -246,9 +247,13 @@ static int dw_spi_mmio_probe(struct platform_device *pdev) dws->paddr = mem->start; - dws->irq = platform_get_irq(pdev, 0); - if (dws->irq < 0) - return dws->irq; /* -ENXIO */ + if (device_property_read_bool(&pdev->dev, "polling")) { + dws->irq = IRQ_NOTCONNECTED; + } else { + dws->irq = platform_get_irq(pdev, 0); + if (dws->irq < 0) + return dws->irq; /* -ENXIO */ + } dwsmmio->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(dwsmmio->clk))