Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754616AbdFWQQM (ORCPT ); Fri, 23 Jun 2017 12:16:12 -0400 Received: from mezzanine.sirena.org.uk ([106.187.55.193]:51880 "EHLO mezzanine.sirena.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754565AbdFWQQK (ORCPT ); Fri, 23 Jun 2017 12:16:10 -0400 From: Mark Brown To: Cyrille Pitchen Cc: Nicolas Ferre , Mark Brown , stable@vger.kernel.org, nicolas.ferre@atmel.com, broonie@kernel.org, linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-spi@vger.kernel.org In-Reply-To: Message-Id: Date: Fri, 23 Jun 2017 17:15:58 +0100 X-SA-Exim-Connect-IP: 2001:470:1f1d:6b5::3 X-SA-Exim-Mail-From: broonie@sirena.org.uk Subject: Applied "spi: atmel: fix corrupted data issue on SAM9 family SoCs" to the spi tree X-SA-Exim-Version: 4.2.1 (built Tue, 02 Aug 2016 21:08:31 +0000) X-SA-Exim-Scanned: No (on mezzanine.sirena.org.uk); Unknown failure Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4061 Lines: 105 The patch spi: atmel: fix corrupted data issue on SAM9 family SoCs has been applied to the spi tree at git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted. You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed. If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced. Please add any relevant lists and maintainers to the CCs when replying to this mail. Thanks, Mark >From 7094576ccdc3acfe1e06a1e2ab547add375baf7f Mon Sep 17 00:00:00 2001 From: Cyrille Pitchen Date: Fri, 23 Jun 2017 17:39:16 +0200 Subject: [PATCH] spi: atmel: fix corrupted data issue on SAM9 family SoCs This patch disables the use of the DMA for data transfer and forces the use of PIO transfers instead as a quick fixup to solve the cache aliasing issue on ARM9 based cores, which embeds a VIVT data cache. Indeed in the case of VIVT data caches, it is not safe to call dma_map_*() functions to map buffers for DMA transfers when those buffers have been allocated by vmalloc() or from any DMA-unsafe area. Further patches may propose a better solution based on the use of a bounce buffer at the SPI sub-system level but such solution needs more time to be discussed. Then the use of DMA transfers could be enabled again to improve the performances but before that, this patch already solves the issue. Signed-off-by: Cyrille Pitchen Acked-by: Nicolas Ferre Signed-off-by: Mark Brown Cc: stable@vger.kernel.org --- drivers/spi/spi-atmel.c | 24 +++++++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c index 1eb83c9613d5..78c885d80c96 100644 --- a/drivers/spi/spi-atmel.c +++ b/drivers/spi/spi-atmel.c @@ -269,6 +269,7 @@ struct atmel_spi_caps { bool is_spi2; bool has_wdrbt; bool has_dma_support; + bool has_pdc_support; }; /* @@ -1426,7 +1427,28 @@ static void atmel_get_caps(struct atmel_spi *as) as->caps.is_spi2 = version > 0x121; as->caps.has_wdrbt = version >= 0x210; +#ifdef CONFIG_SOC_SAM_V4_V5 + /* + * Atmel SoCs based on ARM9 (SAM9x) cores should not use spi_map_buf() + * since this later function tries to map buffers with dma_map_sg() + * even if they have not been allocated inside DMA-safe areas. + * On SoCs based on Cortex A5 (SAMA5Dx), it works anyway because for + * those ARM cores, the data cache follows the PIPT model. + * Also the L2 cache controller of SAMA5D2 uses the PIPT model too. + * In case of PIPT caches, there cannot be cache aliases. + * However on ARM9 cores, the data cache follows the VIVT model, hence + * the cache aliases issue can occur when buffers are allocated from + * DMA-unsafe areas, by vmalloc() for instance, where cache coherency is + * not taken into account or at least not handled completely (cache + * lines of aliases are not invalidated). + * This is not a theorical issue: it was reproduced when trying to mount + * a UBI file-system on a at91sam9g35ek board. + */ + as->caps.has_dma_support = false; +#else as->caps.has_dma_support = version >= 0x212; +#endif + as->caps.has_pdc_support = version < 0x212; } /*-------------------------------------------------------------------------*/ @@ -1567,7 +1589,7 @@ static int atmel_spi_probe(struct platform_device *pdev) } else if (ret == -EPROBE_DEFER) { return ret; } - } else { + } else if (as->caps.has_pdc_support) { as->use_pdc = true; } -- 2.13.1