From: Timur Tabi <timur@freescale.com>
To: linux-fbdev@vger.kernel.org
Subject: Should I use FBINFO_VIRTFB?
Date: Thu, 15 Dec 2011 20:50:47 +0000 [thread overview]
Message-ID: <4EEA5DA7.3010406@freescale.com> (raw)
I'm cleaning up my fbdev driver, and I just noticed FBINFO_VIRTFB:
#define FBINFO_VIRTFB 0x0004 /* FB is System RAM, not device. */
I am currently not setting this flag, but I am allocating my framebuffer in system ram via dma_alloc_coherent(). I don't see any good documentation for this flag, but I suspect I should be enabling it. What exactly does this flag do?
I'd also like some explanation for these two macros, which appear to be related:
#define FBINFO_PARTIAL_PAN_OK 0x0040 /* otw use pan only for double-buffering */
#define FBINFO_READS_FAST 0x0080 /* soft-copy faster than rendering */
--
Timur Tabi
Linux kernel developer at Freescale
next reply other threads:[~2011-12-15 20:50 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-15 20:50 Timur Tabi [this message]
2011-12-15 21:13 ` Should I use FBINFO_VIRTFB? Konrad Rzeszutek Wilk
2011-12-15 22:10 ` Timur Tabi
2011-12-16 11:53 ` Geert Uytterhoeven
2011-12-16 18:18 ` Timur Tabi
2011-12-16 20:16 ` Geert Uytterhoeven
2011-12-19 16:08 ` Timur Tabi
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