From: Michel Lanners <mlan@cpu.lu>
To: ran@krazynet.com
Cc: linuxppc-dev@lists.linuxppc.org
Subject: Re: busmaster/latency for video
Date: Thu, 7 Oct 1999 15:50:14 +0200 (CEST) [thread overview]
Message-ID: <199910071350.PAA00412@piglet.cpu.lu> (raw)
In-Reply-To: <19991006225426.A192@gondolin.asf>
On 6 Oct, this message from Ryan Nielsen echoed through cyberspace:
>
> PCI_COMMAND_MASTER is not enabled and latency = 0 for the ultimate rez video card, and pci_write_config_*
> do not change them. latency = 32 and mastering is enabled for all the other cards in the machine,
>
> should they be enabled ?
That probably means the card doesn't support them.
Normal graphic cards have no need for mastership. Only those with video
inputs need it, in order to transfer video data into the framebuffer
without CPU help.
Michel
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** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~1999-10-07 13:50 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-10-07 5:54 busmaster/latency for video Ryan Nielsen
1999-10-07 13:50 ` Michel Lanners [this message]
1999-10-07 14:06 ` Geert Uytterhoeven
1999-10-07 19:13 ` Michel Lanners
1999-10-08 9:19 ` Geert Uytterhoeven
1999-10-08 10:18 ` Benjamin Herrenschmidt
1999-10-08 17:59 ` Michel Lanners
1999-10-11 6:30 ` Geert Uytterhoeven
1999-10-11 18:12 ` Michel Lanners
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