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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, 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 B29B2C5517A for ; Tue, 27 Oct 2020 16:52:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5956820727 for ; Tue, 27 Oct 2020 16:52:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603817574; bh=nDTdg9vkigXJJd1FTB/cHEAatr2cCXwcOARRfxBsD1c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=wq0wriJ2WZFJ4+4G80KGl+gusDtCoViwy2iCtkcjeWXH2e8tm6oTAncoTf9tFx8RV 5nJaqUsbjCfKavOKUYpIm8UTaBg1SIk0Tw3OgtzW2VPD7T0NHdrvETi/9Ohj+Yrnrn PlVFEjJMh83I3YLV2eCWEo07mt+pyeO//nymjUs4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1813646AbgJ0Qwx (ORCPT ); Tue, 27 Oct 2020 12:52:53 -0400 Received: from mail.kernel.org ([198.145.29.99]:50340 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1794781AbgJ0PNb (ORCPT ); Tue, 27 Oct 2020 11:13:31 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B6B5C20728; Tue, 27 Oct 2020 15:13:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603811611; bh=nDTdg9vkigXJJd1FTB/cHEAatr2cCXwcOARRfxBsD1c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kxNXLU/DMkMw1hJ+gzDHSYQ7HU2Gu963q0LK11W1SMaLVo26ezq79nTXzw8ulMFF4 I+YY1JU3kaAN2kg4gPEk6dDSqOMOVdydXpPNGKIZnSrr3VPNaP99aCNnS5PwyQ/4gQ mNXEC66rnQ8EjNf0UuEb5n246lQC/o6i9NC3I2vk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Brad Bishop , Eddie James , Joel Stanley , Mark Brown , Sasha Levin Subject: [PATCH 5.8 547/633] spi: fsi: Fix clock running too fast Date: Tue, 27 Oct 2020 14:54:50 +0100 Message-Id: <20201027135548.452584804@linuxfoundation.org> X-Mailer: git-send-email 2.29.1 In-Reply-To: <20201027135522.655719020@linuxfoundation.org> References: <20201027135522.655719020@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Brad Bishop [ Upstream commit 0b546bbe9474ff23e6843916ad6d567f703b2396 ] Use a clock divider tuned to a 200MHz FSI bus frequency (the maximum). Use of the previous divider at 200MHz results in corrupt data from endpoint devices. Ideally the clock divider would be calculated from the FSI clock, but that would require some significant work on the FSI driver. With FSI frequencies slower than 200MHz, the SPI clock will simply run slower, but safely. Signed-off-by: Brad Bishop Signed-off-by: Eddie James Signed-off-by: Joel Stanley Link: https://lore.kernel.org/r/20200909222857.28653-3-eajames@linux.ibm.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/spi/spi-fsi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/spi/spi-fsi.c b/drivers/spi/spi-fsi.c index ef5e0826a53c3..a702e9d7d68c0 100644 --- a/drivers/spi/spi-fsi.c +++ b/drivers/spi/spi-fsi.c @@ -403,7 +403,7 @@ static int fsi_spi_transfer_init(struct fsi_spi *ctx) u64 status = 0ULL; u64 wanted_clock_cfg = SPI_FSI_CLOCK_CFG_ECC_DISABLE | SPI_FSI_CLOCK_CFG_SCK_NO_DEL | - FIELD_PREP(SPI_FSI_CLOCK_CFG_SCK_DIV, 4); + FIELD_PREP(SPI_FSI_CLOCK_CFG_SCK_DIV, 19); end = jiffies + msecs_to_jiffies(SPI_FSI_INIT_TIMEOUT_MS); do { -- 2.25.1