Messages in this thread | | | Subject | Re: [PATCH v2] arm64: dts: rockchip: add rk3399 UART DMAs | From | Robin Murphy <> | Date | Fri, 29 Mar 2019 23:24:16 +0000 |
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On 2019-03-27 12:00 pm, Heiko Stuebner wrote: > Hi, > > Am Dienstag, 26. März 2019, 14:49:16 CET schrieb Katsuhiro Suzuki: >> Hello Robin, >> >> Sorry for inconvenience. Since I don't adhere enabling DMA for UARTs, >> please revert my patch if you need. > > I've dropped the patch from my queue now. > >> BTW, there are DMA properties in RK3328 device-tree like as this patch. >> RK3328 UART DMA could not work correctly too...?? > > I remember Rockcihip dma-controllers having issues with burst-sizes > and flushing (there is a no-flushp option in pl330), so it's > possible that all share the same error up to rk3399 and rk3328 > > But so far no-one has shouted regarding the rk3328.
Let me be the first, then, I guess :)
I found an easy way to observe the problem on my 3399, and I've just fired up my 3328 box with a 5.0 distro kernel to find that it behaves the same. Basically just dump a large pile of text into 'less' on the serial console, and scroll through line-by-line - certain lines get dropped except for a few characters at the end.
I'll see if I can narrow it down a bit, starting with trying broken-flushp...
Robin.
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