From patchwork Wed Jun 28 17:20:19 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Lukas Wunner X-Patchwork-Id: 9814947 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 8AB2260383 for ; Wed, 28 Jun 2017 17:41:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 749B52860D for ; Wed, 28 Jun 2017 17:41:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6977D2863F; Wed, 28 Jun 2017 17:41:59 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E060D2860D for ; Wed, 28 Jun 2017 17:41:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751602AbdF1Rl6 (ORCPT ); Wed, 28 Jun 2017 13:41:58 -0400 Received: from mailout1.hostsharing.net ([83.223.95.204]:59809 "EHLO mailout1.hostsharing.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751541AbdF1Rl5 (ORCPT ); Wed, 28 Jun 2017 13:41:57 -0400 Received: from h08.hostsharing.net (h08.hostsharing.net [83.223.95.28]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mailout1.hostsharing.net (Postfix) with ESMTPS id D0BB5100492BC; Wed, 28 Jun 2017 19:41:25 +0200 (CEST) Received: from localhost (5-38-90-81.adsl.cmo.de [81.90.38.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by h08.hostsharing.net (Postfix) with ESMTPSA id 54FB46003F22; Wed, 28 Jun 2017 19:41:54 +0200 (CEST) X-Mailbox-Line: From bca7fb9e406bbfa9ee7e8457cacd34418ef689be Mon Sep 17 00:00:00 2001 Message-Id: In-Reply-To: References: From: Lukas Wunner Date: Wed, 28 Jun 2017 19:20:19 +0200 Subject: [PATCH v2 4/4] spi: Use Apple device properties in absence of ACPI resources MIME-Version: 1.0 To: "Rafael J. Wysocki" , Mark Brown , Ronald Tschalaer , Federico Lorenzi Cc: Mika Westerberg , Andy Shevchenko , Leif Liddy , Daniel Roschka , linux-acpi@vger.kernel.org, linux-spi@vger.kernel.org Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP MacBooks and MacBook Pros introduced since 2015 return empty _CRS data for SPI slaves, causing device initialization to fail. Most of the information that would normally be conveyed via _CRS is available through ACPI device properties instead, so take advantage of them. The meaning and appropriate usage of the device properties was reverse engineered by Ronald Tschalär and carried over from these commits authored by him: https://github.com/cb22/macbook12-spi-driver/commit/9a416d699ef4 https://github.com/cb22/macbook12-spi-driver/commit/0c34936ed9a1 According to Ronald, the device properties have the following meaning: spiSclkPeriod /* period in ns */ spiWordSize /* in number of bits */ spiBitOrder /* 1 = MSB_FIRST, 0 = LSB_FIRST */ spiSPO /* clock polarity: 0 = low, 1 = high */ spiSPH /* clock phase: 0 = first, 1 = second */ spiCSDelay /* delay between cs and receive on reads in 10 us */ resetA2RUsec /* active-to-receive delay? */ resetRecUsec /* receive delay? */ Cc: Mark Brown Cc: Federico Lorenzi Reported-by: Leif Liddy Tested-by: Ronald Tschalär Signed-off-by: Lukas Wunner Acked-by: Mark Brown Acked-by: Mika Westerberg --- Changes v1 -> v2: - Move IS_ENABLED() and dmi_match() conditionals into callee. (Mika) - Allow acpi_spi_parse_apple_properties() to augment or override _CRS by calling it unconditionally rather than only if _CRS is empty. drivers/spi/spi.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 89254a55eb2e..51b7bdf841e4 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -21,6 +21,8 @@ #include #include #include +#include +#include #include #include #include @@ -1685,6 +1687,32 @@ static void of_register_spi_devices(struct spi_master *master) { } #endif #ifdef CONFIG_ACPI +static void acpi_spi_parse_apple_properties(struct spi_device *spi) +{ + struct acpi_device *dev = ACPI_COMPANION(&spi->dev); + const union acpi_object *o; + + if (!IS_ENABLED(CONFIG_X86) || !dmi_match(DMI_SYS_VENDOR, "Apple Inc.")) + return; + + if (!acpi_dev_get_property(dev, "spiSclkPeriod", ACPI_TYPE_BUFFER, &o)) + spi->max_speed_hz = div64_u64(NSEC_PER_SEC, + *(u64 *)o->buffer.pointer); + + if (!acpi_dev_get_property(dev, "spiWordSize", ACPI_TYPE_BUFFER, &o)) + spi->bits_per_word = *(u64 *)o->buffer.pointer; + + if (!acpi_dev_get_property(dev, "spiBitOrder", ACPI_TYPE_BUFFER, &o) && + !*(u64 *)o->buffer.pointer) + spi->mode |= SPI_LSB_FIRST; + if (!acpi_dev_get_property(dev, "spiSPO", ACPI_TYPE_BUFFER, &o) && + *(u64 *)o->buffer.pointer) + spi->mode |= SPI_CPOL; + if (!acpi_dev_get_property(dev, "spiSPH", ACPI_TYPE_BUFFER, &o) && + *(u64 *)o->buffer.pointer) + spi->mode |= SPI_CPHA; +} + static int acpi_spi_add_resource(struct acpi_resource *ares, void *data) { struct spi_device *spi = data; @@ -1758,6 +1786,8 @@ static acpi_status acpi_register_spi_device(struct spi_master *master, acpi_spi_add_resource, spi); acpi_dev_free_resource_list(&resource_list); + acpi_spi_parse_apple_properties(spi); + if (ret < 0 || !spi->max_speed_hz) { spi_dev_put(spi); return AE_OK;