Re: [PATCH 1/3] ata: sata_dwc_460ex: use "dmas" DT property to find dma channel
From: Julian Margetson
Date: Mon Dec 21 2015 - 12:20:56 EST
On 12/21/2015 12:48 PM, Andy Shevchenko wrote:
On Sun, 2015-12-20 at 22:55 +0200, Andy Shevchenko wrote:
On Sun, Dec 20, 2015 at 10:17 PM, Andy Shevchenko
<andy.shevchenko@xxxxxxxxx> wrote:
On Sun, Dec 20, 2015 at 8:49 PM, MÃns RullgÃrd <mans@xxxxxxxxx>
wrote:
I noticed thanks to DWC_PARAMS that burst size is hardcoded to 32
items on this board, however registers for SATA program it to 64. I
remember that I got no interrupt when I programmed transfer width
wrongly (64 bits against 32 bits) when I ported dw_dmac to be used
on
Intel SoCs.
One more thing, I have a patch to monitor DMA IO, we may check what
exactly the values are written / read in DMA. I can share it
tomorrow.
As promised the patch I have to debug IO of DW DMA. Didn't check though
if it applies cleanly on top of recent vanilla kernel.
patch -p1 -R <../0001-dw_dmac-debug-dma-controller-IO.patch
patching file drivers/dma/dw/core.c
Hunk #1 succeeded at 543 (offset -27 lines).
Hunk #2 FAILED at 1571.
Hunk #3 FAILED at 1717.
2 out of 3 hunks FAILED -- saving rejects to file drivers/dma/dw/core.c.rej
patching file drivers/dma/dw/regs.h
Hunk #1 succeeded at 114 (offset -16 lines).
Hunk #2 succeeded at 262 (offset -39 lines).
Hunk #3 succeeded at 293 (offset -40 lines).
root@julian-VirtualBox:/usr/src/linux-test# patch -p1
<../0001-dw_dmac-debug-dma-controller-IO.patch
patching file drivers/dma/dw/core.c
Hunk #1 succeeded at 543 (offset -27 lines).
Hunk #2 FAILED at 1572.
Hunk #3 FAILED at 1716.
2 out of 3 hunks FAILED -- saving rejects to file drivers/dma/dw/core.c.rej
patching file drivers/dma/dw/regs.h
Hunk #1 succeeded at 114 (offset -16 lines).
Hunk #2 succeeded at 264 (offset -39 lines).
Hunk #3 succeeded at 307 (offset -40 lines).
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