linux-kernel - [PATCH v3 3/3] avr32: at32ap700x: set DMA slave properties for MCI dw

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Message-ID: <50417BB6.3020300@yahoo.es>
Date:	Sat, 01 Sep 2012 11:06:30 +0800
From:	Hein Tibosch <hein_tibosch@...oo.es>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	viresh kumar <viresh.kumar@...aro.org>,
	Hans-Christian Egtvedt <egtvedt@...fundet.no>
CC:	Arnd Bergmann <arnd.bergmann@...aro.org>,
	"ludovic.desroches" <ludovic.desroches@...el.com>,
	Havard Skinnemoen <havard@...nnemoen.net>,
	spear-devel <spear-devel@...t.st.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH v3 3/3] avr32: at32ap700x: set DMA slave properties for MCI
 dw_dmac

The MCI makes use of the dw_dmac driver when DMA is being used.
Due to recent changes to dw_dmac the MCI+DMA driver was broken because:
- a patch in dw_dmac allowed for 64-bit transfers on the memory side, giving
an illegal value of 3 in the SRC/DST_TR_WIDTH register
(http://lkml.org/lkml/2012/1/18/52)
- the SMS field in the CTLL register received the wrong value 0

This patch sets the SMS (Source Master Select) to 1 and limits
the maximum transfer width to 32 bits.

Note: this can only be applied after the previous:
[PATCH v3 2/3] dw_dmac: max_mem_width limits value for SRC/DST_TR_WID register

Signed-off-by: Hein Tibosch <hein_tibosch@...oo.es>
Acked-by: Hans-Christian Egtvedt <egtvedt@...fundet.no>
---
 arch/avr32/mach-at32ap/at32ap700x.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/arch/avr32/mach-at32ap/at32ap700x.c b/arch/avr32/mach-at32ap/at32ap700x.c
index 0445c4f..7250c70 100644
--- a/arch/avr32/mach-at32ap/at32ap700x.c
+++ b/arch/avr32/mach-at32ap/at32ap700x.c
@@ -1356,6 +1356,11 @@ at32_add_device_mci(unsigned int id, struct mci_platform_data *data)
 	slave->sdata.cfg_lo &= ~(DWC_CFGL_HS_DST_POL
 				| DWC_CFGL_HS_SRC_POL);
 
+	/* Setup DMA controller: let source be master */
+	slave->sdata.src_master = 1;
+	/* Limit maximum transfer width to 32-bit */
+	slave->sdata.max_mem_width = DW_MEM_WIDTH_32;
+
 	data->dma_slave = slave;
 
 	if (platform_device_add_data(pdev, data,
-- 
1.7.8.0
--
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