linux-kernel - Re: [PATCH 2/4] radeonfb: add new module parameter to force PLL calculation

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Message-ID: <20070910222012.GB5155@devil>
Date:	Tue, 11 Sep 2007 00:20:12 +0200
From:	aherrman@...or.de
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	linux-fbdev-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] radeonfb: add new module parameter to force PLL calculation

On Tue, Sep 04, 2007 at 03:46:29PM +0200, Benjamin Herrenschmidt wrote:
> I don't like those tunables. First we should get a look at what values
> we obtain from the BIOS. Could be something with the parsing of ATOM
> BIOS. In any case, we might be able to detect we got wrong values or use
> subsystem vendor/device ID to blacklist.

So what should I looking for?
Here is the diff of the radeonfb kernel messages between 
(-)nopllcalc and (+)forcing pll calculation with my patch:

   vSync_width: 4
   clock: 7350
 Setting up default mode based on panel info
-hStart = 672, hEnd = 712, hTotal = 824
-vStart = 404, vEnd = 408, vTotal = 437
-h_total_disp = 0x4f0066           hsync_strt_wid = 0x5029a
-v_total_disp = 0x18f01b4          vsync_strt_wid = 0x40193
+hStart = 1312, hEnd = 1352, hTotal = 1464
+vStart = 804, vEnd = 808, vTotal = 837
+h_total_disp = 0x9f00b6           hsync_strt_wid = 0x5051a
+v_total_disp = 0x31f0344          vsync_strt_wid = 0x40323
 pixclock = 13605
 freq = 7350
-Console: switching to colour frame buffer device 80x25
+freq = 7350, PLL min = 20000, PLL max = 40000
+ref_div = 6, ref_clk = 1432, output_freq = 29400
+ref_div = 6, ref_clk = 1432, output_freq = 29400
+post div = 0x2
+fb_div = 0x7b
+ppll_div_3 = 0x2007b
+Console: switching to colour frame buffer device 160x50
 radeonfb (0000:01:05.0): ATI Radeon 5975 "Yu"
 radeonfb_pci_register END

"nopllcalc" results in a console 80x25 but forcing pll calculation gives
the expected result.

BTW, I am a little surprised that the display doesn't blank without
my patch as it used to in the past ...

  Oops, PCI ID 0x5975 was already added with commit
  b5f2f4d1a6d7efde39cfb5e1d034981c69f2214c

I guess I have to repeat some testing with both the older commit and my patch(es)
to sort out what is really needed to support my RS482/0x5975.


Regards,

Andreas

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