#armlinux on 2024-09-26 — irc logs at libera.irclog.whitequark.org

2021-05-27 16:22 ChanServ changed the topic of #armlinux to: ARM kernel talk [Upstream kernel, find your vendor forums for questions about their kernels] | https://libera.irclog.whitequark.org/armlinux

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06:30 <milkylainen> hmm. what could be causing spidev transactions from userspace to be corrupted >-ish bytes 32. Isn't a clear limit. 16 works always afaict. On the same controller is another cs with a spi-nor which works perfectly fine-

06:51 <geertu> milkylainen: Is that a cacheline? Does the driver use DMA?

06:54 <milkylainen> geertu: yeah. I was thinking cacheline sizes too. The driver doesn't use DMA, but it's a real oddball. It sends of the transactions to a microcontroller mapped in memory. The dragonite on the Armada 370.

06:55 <milkylainen> so iomem of sorts, I guess?

06:56 <milkylainen> I don't think it's the controller driver though.

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07:33 <milkylainen> hmm. Could be that the spidev was allocating with KMALLOC_MINALIGN in this older kernel?

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07:34 <milkylainen> For v7 that is smaller than the data cachelines?

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