lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Fri, 27 Oct 2006 22:03:25 +0200 From: "Franck Bui-Huu" <vagabon.xyz@...il.com> To: "Miguel Ojeda" <maxextreme@...il.com> Cc: akpm@...l.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 2.6.19-rc1 full] drivers: add LCD support On 10/26/06, Miguel Ojeda <maxextreme@...il.com> wrote: > To be clearer. And you are wrong: you can write other modules which > want to know what the LCD is showing, or use it; without worrying > about framebuffer things. They can read / write "cfag12864b_buffer" as > well as cfag12864bfb do. Why not? > Suppose I'm writing a user space application which uses your frame buffer driver. I would naturaly mmap your device since it's the easiest way to use a frame buffer. Now I want to display as fast as possible a set of images. How am I sure that each image is sent to the lcd ? For example, suppose the application just finished to copy image A into the buffer, and now it starts to copy image B into the buffer but the work queue has not been scheduled yet... Futhermore I'm not sure it's a common use case for such device, is it ? I would say that the usual case for such LCD is to display an image every now and then. If so do we really need to give the possibility to mmap the device ? Is a simple synchrone write() enough ? BTW how can the application retrieve the refresh rate from the driver ? Franck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists