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=-2.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 258ABECDFB8 for ; Fri, 20 Jul 2018 12:28:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D057120854 for ; Fri, 20 Jul 2018 12:28:29 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D057120854 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388012AbeGTNQ2 (ORCPT ); Fri, 20 Jul 2018 09:16:28 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:36508 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730720AbeGTNQ0 (ORCPT ); Fri, 20 Jul 2018 09:16:26 -0400 Received: from localhost (LFbn-1-12238-233.w90-92.abo.wanadoo.fr [90.92.53.233]) by mail.linuxfoundation.org (Postfix) with ESMTPSA id 38560BBF; Fri, 20 Jul 2018 12:28:21 +0000 (UTC) From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jonas Gorski , Mark Brown , Amit Pundir Subject: [PATCH 4.9 11/66] spi/bcm63xx: make spi subsystem aware of message size limits Date: Fri, 20 Jul 2018 14:13:28 +0200 Message-Id: <20180720121407.910738439@linuxfoundation.org> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180720121407.228772286@linuxfoundation.org> References: <20180720121407.228772286@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jonas Gorski commit 0135c03df914f0481c61f097c78d37cece84f330 upstream. The bcm63xx SPI controller does not allow manual control of the CS lines and will toggle it automatically before and after sending data, so we are limited to messages that fit in the FIFO buffer. Since the CS lines aren't available as GPIOs either, we will need to make slave drivers aware of this limitation so they can handle them accordingly. Signed-off-by: Jonas Gorski Signed-off-by: Mark Brown Signed-off-by: Amit Pundir Signed-off-by: Greg Kroah-Hartman --- drivers/spi/spi-bcm63xx.c | 9 +++++++++ 1 file changed, 9 insertions(+) --- a/drivers/spi/spi-bcm63xx.c +++ b/drivers/spi/spi-bcm63xx.c @@ -428,6 +428,13 @@ static irqreturn_t bcm63xx_spi_interrupt return IRQ_HANDLED; } +static size_t bcm63xx_spi_max_length(struct spi_device *dev) +{ + struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master); + + return bs->fifo_size; +} + static const unsigned long bcm6348_spi_reg_offsets[] = { [SPI_CMD] = SPI_6348_CMD, [SPI_INT_STATUS] = SPI_6348_INT_STATUS, @@ -541,6 +548,8 @@ static int bcm63xx_spi_probe(struct plat master->transfer_one_message = bcm63xx_spi_transfer_one; master->mode_bits = MODEBITS; master->bits_per_word_mask = SPI_BPW_MASK(8); + master->max_transfer_size = bcm63xx_spi_max_length; + master->max_message_size = bcm63xx_spi_max_length; master->auto_runtime_pm = true; bs->msg_type_shift = bs->reg_offsets[SPI_MSG_TYPE_SHIFT]; bs->msg_ctl_width = bs->reg_offsets[SPI_MSG_CTL_WIDTH];