Messages in this thread | | | Date | Mon, 17 Dec 2018 21:16:58 +0200 | From | Aaro Koskinen <> | Subject | Re: [PATCH] dmaengine: ti: omap-dma: Configure LCH_TYPE for OMAP1 |
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On Thu, Nov 22, 2018 at 03:12:36PM +0000, Russell King - ARM Linux wrote: > Also we can't deal with the omap_set_dma_dest_burst_mode() setting - > DMAengine always uses a 64 byte burst, but udc wants a smaller burst > setting. Does this matter?
Looking at OMAP1 docs, it seems it supports only 16 bytes. Then checking DMAengine code, I don't think these CSDP bit values are not valid for OMAP1:
CSDP_SRC_BURST_1 = 0 << 7, CSDP_SRC_BURST_16 = 1 << 7, CSDP_SRC_BURST_32 = 2 << 7, CSDP_SRC_BURST_64 = 3 << 7,
From TI SPRU674 document, pages 50-51:
0 single access (no burst) 1 single access (no burst) 2 burst 4 3 reserved (do not use this setting)
So if CSDP_SRC_BURST_64 (3) gets programmed OMAP1, I wonder what is the end result, no burst or burst 4...
A.
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