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core/linux-armv7-rc 3.18.rc7-1
This commit is contained in:
Kevin Mihelich
parent
7e95860434
commit
eccbbd0056
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From 3c583f70a8e2feda03db77d2c8e9a41d302ac657 Mon Sep 17 00:00:00 2001
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From: Andrew Lunn <andrew@lunn.ch>
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Date: Wed, 12 Nov 2014 23:10:08 +0100
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Subject: [PATCH] mmc: mvsdio: Work around broken TX DMA
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In order to use the mvsdio driver for sdio, it has been necessary to
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use a module parameter to disable DMA so to force PIO is used. It is
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then possible to use wireless LAN devices like mwifiex found on
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topkick and mirabox. However, accessing an MMC SD card does work with
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DMA.
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Investigation has shown that MMC block device accesses are always
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aligned to 64 byte boundaries, where as transfers from mwifiex are
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rarely more than word aligned. It has also been determined that card
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to host transfers work with DMA for SDIO devices, but host to card
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transfers with DMA have problems.
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This patch extends the current checks for buffers which are not word
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aligned or multiple of words. All host to card transfers which are not
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64 byte aligned are now also performed via PIO. This should not affect
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the performance of SD cards, but allow sdio devices to work out of the
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box, and they are likely to be more efficient since DMA will be used
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for card to host transfers.
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Tested on mirabox for wifi via mwifiex
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Tested on 370 RD for file systems on an SD card.
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Signed-off-by: Andrew Lunn <andrew@lunn.ch>
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Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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---
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drivers/mmc/host/mvsdio.c | 7 ++++++-
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1 file changed, 6 insertions(+), 1 deletion(-)
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diff --git a/drivers/mmc/host/mvsdio.c b/drivers/mmc/host/mvsdio.c
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index 6b4c5ad..4f8618f 100644
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--- a/drivers/mmc/host/mvsdio.c
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+++ b/drivers/mmc/host/mvsdio.c
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@@ -111,10 +111,15 @@ static int mvsd_setup_data(struct mvsd_host *host, struct mmc_data *data)
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mvsd_write(MVSD_BLK_COUNT, data->blocks);
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mvsd_write(MVSD_BLK_SIZE, data->blksz);
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- if (nodma || (data->blksz | data->sg->offset) & 3) {
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+ if (nodma || (data->blksz | data->sg->offset) & 3 ||
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+ ((!(data->flags & MMC_DATA_READ) && data->sg->offset & 0x3f))) {
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/*
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* We cannot do DMA on a buffer which offset or size
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* is not aligned on a 4-byte boundary.
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+ *
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+ * It also appears the host to card DMA can corrupt
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+ * data when the buffer is not aligned on a 64 byte
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+ * boundary.
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*/
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host->pio_size = data->blocks * data->blksz;
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host->pio_ptr = sg_virt(data->sg);
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--
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2.1.3
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@ -4,7 +4,7 @@
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buildarch=4
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_rcver=3.18
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_rcrel=6
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_rcrel=7
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_rcnrel=armv7-x2
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pkgbase=linux-armv7-rc
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@ -26,16 +26,18 @@ source=("http://www.kernel.org/pub/linux/kernel/v3.x/${_srcname}.tar.xz"
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'0002-ARM-atags-fdt-retrieve-MAC-addresses-from-Marvell-bo.patch'
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'0003-SMILE-Plug-device-tree-file.patch'
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'0004-fix-mvsdio-eMMC-timing.patch'
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'0001-mmc-mvsdio-Work-around-broken-TX-DMA.patch'
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'config')
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md5sums=('fb30d0f29214d75cddd2faa94f73d5cf'
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'fcfb06d0d29d6f51d79bcd4c2c4e622c'
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'67542f665e9e64977cc90c972904561f'
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'3f67a949be63d47b6286ec63e6194e54'
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'11f251b44132f76e415f361f1922b65a'
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'SKIP'
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'bf5c78900f42d0ae6b7f45d8b88ba7f8'
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'4e54599d103d95f9eadd3a4c6a413da0'
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'11889f6e6873f79059c5d9bf3fcc0cf8'
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'e728042f0d32a7d2e0610ed3eaf4ad52'
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'1194dc833774a62c85572b2d4256747c')
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'8470443040fce04fec4411aa7ddd9f51'
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'88ad293719264dcb3ad58a35cc698735')
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prepare() {
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cd "${srcdir}/${_srcname}"
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@ -51,6 +53,7 @@ prepare() {
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git apply ../0002-ARM-atags-fdt-retrieve-MAC-addresses-from-Marvell-bo.patch
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git apply ../0003-SMILE-Plug-device-tree-file.patch
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git apply ../0004-fix-mvsdio-eMMC-timing.patch
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git apply ../0001-mmc-mvsdio-Work-around-broken-TX-DMA.patch
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# AUFS patches
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cp -ru "${srcdir}/aufs3-standalone/Documentation" .
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@ -1,6 +1,6 @@
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#
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# Automatically generated file; DO NOT EDIT.
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# Linux/arm 3.18.0-rc6-1 Kernel Configuration
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# Linux/arm 3.18.0-rc7-1 Kernel Configuration
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#
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CONFIG_ARM=y
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CONFIG_ARM_HAS_SG_CHAIN=y
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@ -2248,10 +2248,10 @@ CONFIG_NET_VENDOR_I825XX=y
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# CONFIG_IP1000 is not set
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# CONFIG_JME is not set
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CONFIG_NET_VENDOR_MARVELL=y
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CONFIG_MV643XX_ETH=m
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CONFIG_MV643XX_ETH=y
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CONFIG_MVMDIO=y
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CONFIG_MVNETA=m
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# CONFIG_MVPP2 is not set
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CONFIG_MVPP2=m
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# CONFIG_SKGE is not set
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# CONFIG_SKY2 is not set
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CONFIG_NET_VENDOR_MELLANOX=y
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@ -4280,9 +4280,6 @@ CONFIG_DVB_AF9033=m
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#
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CONFIG_VGA_ARB=y
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CONFIG_VGA_ARB_MAX_GPUS=16
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CONFIG_GPU_VIVANTE_V4=y
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CONFIG_GPU_VIVANTE_PROFILER=y
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# CONFIG_GPU_VIVANTE_DEBUG is not set
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CONFIG_TEGRA_HOST1X=y
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CONFIG_TEGRA_HOST1X_FIREWALL=y
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CONFIG_IMX_IPUV3_CORE=m
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