From: "Miguel Ojeda" <maxextreme@gmail.com>
To: "Paulo Marques" <pmarques@grupopie.com>
Cc: akpm@osdl.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2.6.19-rc1 update 2] drivers: add LCD support
Date: Thu, 12 Oct 2006 16:05:26 +0000 [thread overview]
Message-ID: <653402b90610120905q8b7ae4by9166d0e6c0f95f43@mail.gmail.com> (raw)
In-Reply-To: <452E4D1A.9000409@grupopie.com>
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.
next prev parent reply other threads:[~2006-10-12 16:06 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-12 14:04 Miguel Ojeda Sandonis
2006-10-12 14:11 ` Paulo Marques
2006-10-12 15:59 ` Miguel Ojeda
2006-10-12 16:05 ` Miguel Ojeda [this message]
2006-10-12 21:54 ` Andrew Morton
2006-10-12 22:38 ` Miguel Ojeda
2006-10-13 19:48 ` Pavel Machek
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