Messages in this thread | | | Date | Thu, 12 Oct 2006 16:05:26 +0000 | From | "Miguel Ojeda" <> | Subject | Re: [PATCH 2.6.19-rc1 update 2] drivers: add LCD support |
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Excuse me, also:
On 10/12/06, Paulo Marques <pmarques@grupopie.com> wrote: > > Also, what do these "nop"'s do? Isn't there a way to read the "busy" > status from the controller and just write as fast as possible? >
I found another bug that "changes" randomly the "startline" value. I spent a _lot_ of time checking what would be the smallest way to have the work done without any problem.
If you remove 1 of the 2 nops (after _address()), you will get some flickering on one of the controllers, about 15 times per minute. If you remove both, the "evil" controller do worse things.
Really, I have been trying a lot of ways to improve it and find the explanation of that weird changes, and the best algorithm I found it the one I have sent. Dirty, but it works safely. I also tried with different timings and delays, but they didn't work. The only way I found is to make the LCD do such "nop" operations. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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