The patch titled
Subject: avr32-linux: at32ap700x: set DMA slave properties for MCI dw_dmac
has been added to the -mm tree. Its filename is
avr32-linux-at32ap700x-set-dma-slave-properties-for-mci-dw_dmac.patch
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From: Hein Tibosch <hein_tibosch@xxxxxxxx>
Subject: avr32-linux: 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 the driver was broken because:
- the SMS field in the CTLL register received the wrong value 0
- 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.
This patch sets the SMS to 1 and limits the maximum transfer width to 2
(32 bits)
Signed-off-by: Hein Tibosch <hein_tibosch@xxxxxxxx>
Cc: Hans-Christian Egtvedt <egtvedt@xxxxxxxxxxxx>
Cc: Havard Skinnemoen <havard@xxxxxxxxxxxxxx>
Cc: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
Cc: Arnd Bergmann <arnd.bergmann@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/avr32/mach-at32ap/at32ap700x.c | 4 ++++
1 file changed, 4 insertions(+)
diff -puN arch/avr32/mach-at32ap/at32ap700x.c~avr32-linux-at32ap700x-set-dma-slave-properties-for-mci-dw_dmac arch/avr32/mach-at32ap/at32ap700x.c
--- a/arch/avr32/mach-at32ap/at32ap700x.c~avr32-linux-at32ap700x-set-dma-slave-properties-for-mci-dw_dmac
+++ a/arch/avr32/mach-at32ap/at32ap700x.c
@@ -1355,6 +1355,10 @@ at32_add_device_mci(unsigned int id, str
| DWC_CFGH_DST_PER(1));
slave->sdata.cfg_lo &= ~(DWC_CFGL_HS_DST_POL
| DWC_CFGL_HS_SRC_POL);
+ /* Give CTLL SMS value 1 */
+ slave->sdata.src_master = 1;
+ /* SRC/DST_TR_WIDTH register only accepts 0,1,2 */
+ slave->sdata.max_mem_width = 2;
data->dma_slave = slave;
_
Patches currently in -mm which might be from hein_tibosch@xxxxxxxx are
dw_dmac-make-driver-endianness-configurable.patch
avr32-linux-at32ap700x-set-dma-slave-properties-for-mci-dw_dmac.patch
lib-decompressc-add-__init-to-decompress_method-and-data.patch
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