On Wed, Mar 27, 2013 at 06:38:11PM +0900, Chanho Min wrote:
> In DMA support, The received data is not pushed to tty until the DMA buffer
> is filled. But some megabyte rate chips such as BT expect fast response and
> data should be pushed immediately. In order to fix this issue, We suggest
> the u
>Looking back at the patch, do you know if we can get rid of
>some of the #ifdefs and have this like a runtime switch set in
>struct amba_pl011_data or Device Tree?
Yes, I know. I'll come back with v2 soon.
Thanks,
Chanho
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On Mon, Jan 14, 2013 at 8:27 AM, Chanho Min wrote:
> We just want to use this HW function even if SW support is needed.
> Anyway, It was very useful for megabyte rate chips.
So RX DMA will not be enabled for things like console, but
accelerators etc. OK that's perfectly valid.
Looking back at t
On Mon, Jan 14, 2013 at 3:46 PM, Linus Walleij wrote:
> On Mon, Jan 14, 2013 at 1:26 AM, Russell King - ARM Linux
>> What you describe above is exactly the problem I see on the Versatile
>> platform with it's PL080 and PL011. I made the comment that this setup
>> can't work properly as it stands.
On Mon, Jan 14, 2013 at 1:26 AM, Russell King - ARM Linux
wrote:
> [Me]
>> But it may very well be that the single request can not be
>> enabled for the PL011 for it to work properly.
>
> What you describe above is exactly the problem I see on the Versatile
> platform with it's PL080 and PL011. I
On Mon, Jan 14, 2013 at 01:04:58AM +0100, Linus Walleij wrote:
> At some point we reasoned that we may actually be saved
> by the reverse phenomena - if single request is *NOT*
> connected, there will very often be some characters in the
> FIFO, and that's enough to trigger the RTIM IRQ, and we get
On Sat, Jan 12, 2013 at 7:50 AM, Chanho Min wrote:
> We tested as follows:
> We set baud rate to 3Mbps and transfer 5000 bytes via /dev/tty at
> a time. Then 4096 bytes is received by DMA irq. But, There is no way
> to get remaining 904 bytes, unless another 3192 bytes are coming,
OK clearly cut
On Fri, Jan 11, 2013 at 7:13 AM, Chanho Min wrote:
> In DMA support, Received data is not triggered until the DMA buffer is filled.
Interesting! As you can see in commits:
commit ead76f329f777c7301e0a5456a0a1c7a081570bd
"ARM: 6763/1: pl011: add optional RX DMA to PL011 v2"
commit 5d7b8467e18b1
On Fri, Jan 11, 2013 at 03:13:31PM +0900, Chanho Min wrote:
> In DMA support, Received data is not triggered until the DMA buffer is filled.
> In order to actually use Rx DMA, We would like to suggest the use of the timer
> for polling DMA buffer. It makes possible character-level trigger.
> In our
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