Re: NV50 backlight brightness

From: Aaron Sowry <aaron+nv-+1tCnOwpXBmzQB+pC5nmwQ@public.gmane.org>
To: Ben Skeggs <skeggsb-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Subject: Re: NV50 backlight brightness
Date: Fri, 22 Oct 2010 11:57:40 +0200	[thread overview]
Message-ID: <20101022095740.GA30072@aeneby.se> (raw)
In-Reply-To: <1287657920.3245.1.camel@nisroch>


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On Thu, Oct 21, 2010 at 08:45:20PM +1000, Ben Skeggs wrote:
> What value does 0x610084 contain on boot for you?
> 
Using the attached patch (hopefully early enough on in the initialisation):

[aaron@jules ~]$ dmesg | grep NV50
[drm] nouveau 0000:01:00.0: Detected an NV50 generation card (0x0a8600a2)
NV50 0x00610084: 0xa0000000

What's the relevance of this value?

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--- /home/aaron/rpmbuild/BUILD/kernel-2.6.35.fc14.orig/drivers/gpu/drm/nouveau/nv50_display.c	2010-09-09 23:00:38.774029000 +0200
+++ /home/aaron/rpmbuild/BUILD/kernel-2.6.35.fc14/linux-2.6.35.x86_64/drivers/gpu/drm/nouveau/nv50_display.c	2010-10-22 11:36:32.252185209 +0200
@@ -205,6 +205,8 @@ nv50_display_init(struct drm_device *dev
 
 	NV_DEBUG_KMS(dev, "\n");
 
+	printk("NV50 0x00610084: 0x%08x\n", nv_rd32(dev, 0x00610084));
+
 	nv_wr32(dev, 0x00610184, nv_rd32(dev, 0x00614004));
 	/*
 	 * I think the 0x006101XX range is some kind of main control area

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