linux-kernel - Re: [PATCH] dmaengine: ti: omap-dma: Configure LCH

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Message-ID: <20181125171428.GL53235@atomide.com>
Date:   Sun, 25 Nov 2018 09:14:28 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     Aaro Koskinen <aaro.koskinen@....fi>
Cc:     Russell King - ARM Linux <linux@...linux.org.uk>,
        Peter Ujfalusi <peter.ujfalusi@...com>, vkoul@...nel.org,
        dan.j.williams@...el.com, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCH] dmaengine: ti: omap-dma: Configure LCH_TYPE for OMAP1

* Aaro Koskinen <aaro.koskinen@....fi> [181125 16:58]:
> Below changes get traffic going with DMA & g_ether...

Oh cool, if you have dma and g_ether working, you should
test it with a variable size ping test loop :) That should
expose any issues within few minutes.

Below is the test script I was using earlier, the
tusb6010 comment there is probably no longer valid.

Regards,

Tony

8< ----------------
#!/bin/bash

#
# At least tusb6010 dma needs 32-bit aligned buffers.
# That can be done by setting no_skb_reserve with:
# musb->g.quirk_avoids_skb_reserve = 1;
#

device=$1
size=$2
wraps=0

while [ 1 ]; do
	#echo "Pinging with size $size"
	if ! ping -w0 -c1 -s$size $device > /dev/null 2>&1; then
		break;
	fi
	size=$(expr $size + 1)

	if [ $size -gt 8192 ]; then
		wraps=$(expr $wraps + 1)
		echo "wrapping ($wraps) at $size"
		size=1
	fi
done
echo "Test ran up to $size"