#linux-sunxi on 2019-05-25 — irc logs at freenode.irclog.whitequark.org

2018-08-03 10:18 rellla changed the topic of #linux-sunxi to: Allwinner/sunxi /development discussion - did you try looking at our wiki? https://linux-sunxi.org - Don't ask to ask. Just ask and wait! - https://github.com/linux-sunxi/ - Logs at http://irclog.whitequark.org/linux-sunxi - *only registered users can talk*

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09:37 <KotCzarny> hmm, by any chance someone has a fix for hanging spi driver on 3.4?

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12:39 <mru> have you tried 5.1?

12:39 <mru> KotCzarny: ^

12:39 <KotCzarny> i'm stuck with 3.4 for this project

12:39 <mru> you could still try it and see if it's been fixed

12:40 <mru> anything else would be a waste of time

12:40 <KotCzarny> yes, mainline was fixed, but i suspect whole spi infra changed a lot

12:41 <mru> was the problem explicitly fixed? or incidentally through other changes?

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12:41 <KotCzarny> whole sunxi-spi was a rewrite i guess

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12:41 <mru> you guess

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12:42 <mru> find out for sure

12:42 <KotCzarny> for now i'm trying workaround (ie. limiting transfer to 32bytes max)

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13:15 <KotCzarny> yup. seems to be it

13:15 <KotCzarny> using transfers up to 64 bytes i didnt manage to hang the spi

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14:00 <KotCzarny> wth

14:00 <KotCzarny> printf("[w=%d,bpp8=%d,x=%d,y=%d,o=%d]\n",w,bpp8,X,Y,(X+Y*w)*bpp8);m

14:00 <KotCzarny> [w=480,bpp8=2,x=0,y=319,o=-320]

14:00 <KotCzarny> HOW?

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14:07 <lurchi_> KotCzarny: overflow, because X is a type to small?

14:07 <KotCzarny> all unsigned ints

14:07 <KotCzarny> unless preprocessing does something funky on the code

14:08 <lurchi_> %d is signed int, use %u

14:08 <KotCzarny> but it gets segv, so it's really doing some overflow, but how and why?

14:08 <KotCzarny> #define putp(X,Y,C) memcpy(buf+(X+Y*w)*bpp8, C, bpp8)

14:08 <KotCzarny> this is the macro

14:09 <megi> view the preprocessed code

14:09 <KotCzarny> for some reason Y*w gets out as negative

14:09 <KotCzarny> even if both Y and w are uints

14:09 <KotCzarny> megi: how?

14:09 <lurchi_> gcc -E

14:09 <lurchi_> i.e. substitute "-c " with "-E "

14:10 <lurchi_> and use a proper "-o outfile"

14:10 <megi> -save-temps may also work

14:11 <KotCzarny> nothing unusual

14:11 <KotCzarny> ie. types arent changed automagically, and nothing resets the numbers

14:12 <megi> assembly also looks ok?

14:12 <KotCzarny> i cant read assembly

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14:15 <megi> put the .s file from -save-temps somewhere

14:15 <megi> pastebin or smth

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14:16 <KotCzarny> shall i use any debuggin flag to make it more readable?

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14:17 <megi> -O2 should be fine

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14:18 <KotCzarny> http://54.37.26.148/h3d/fbtool.s

14:19 <KotCzarny> [w=480,x=0,y=319,y*w=-160]

14:21 <mru> and the C source?

14:21 <KotCzarny> you mean .i file?

14:21 <mru> no, the .c file

14:21 <KotCzarny> same dir

14:22 <KotCzarny> macro is at line 36

14:23 <KotCzarny> and weird use of it at line 94

14:23 <megi> use the guards

14:23 <megi> ()

14:23 <mru> yes, that's probably it

14:23 <megi> (x)+(y)*(w) etc

14:24 <KotCzarny> hmm, could be it, lets see

14:24 <mru> it's definitely wrong without

14:25 <KotCzarny> yup, worked, but what was the reason?

14:25 <KotCzarny> it was working fine before i put display in rotated mode

14:25 <mru> your X+y*w expands to X+h-1*w

14:25 <KotCzarny> ahh

14:25 <KotCzarny> thanks a lot, you've saved me from headdesk

14:28 <KotCzarny> now the only obstacle is enabling touch via the samee spi

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18:24 <jernej> clementp[m]: Thanks for taking care of H6 DMA and IR

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