Re: Twister savagefb doesn't sync (resolved for 640x480@64K)

[Vassilis Virvilis <vasvir@iit.demokritos.gr>]

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Hi Alex,

I would like to thank you and Antonino for all the help so far. I have finally
manage to make my twister to sync with both of my screens (one TFT, one CRT).

I am attaching the patch. The patch itself disables all modes other than
640x480@64K-60Hz. Note that the patch is clearly inapropriate but it
may sparkle some discussion about how this thing works.

One more question:

Alex Deucher wrote:
>> > The reason the savage xorg drver uses the bios is because almost every
>> > panel they connect to the chip seems to require fairly custom timings.
>> > the twisters and prosavages are even worse than the discrete chips.
>> > Also, only the bios seems to know the magic incantation necessary for
>> > dualhead.  I tried for a while to add non-bios mode setting to crtc2
>> > without much luck.
>>

When you say panel what do you mean?
a) The rest of the framebuffer and scan logic resided in CRTC?
b) The screen attached to CRTC?

I believe a) but I would like to know for sure.

Thanks again...

    .bill

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diff --git a/drivers/video/savage/savagefb_driver.c b/drivers/video/savage/savagefb_driver.c
index 10e6b3a..117205e 100644
--- a/drivers/video/savage/savagefb_driver.c
+++ b/drivers/video/savage/savagefb_driver.c
@@ -901,6 +901,7 @@ static int savagefb_decode_var (struct f
 
 	SavageCalcClock (dclk, 1, 1, 127, 0, 4, 180000, 360000, &m, &n, &r);
 	/* m = 107; n = 4; r = 2; */
+	m = 0xfc; n = 0x5; r = 0x3; /* TwisterP */
 
 	if (par->MCLK <= 0) {
 		par->SR10 = 255;
@@ -908,6 +909,7 @@ static int savagefb_decode_var (struct f
 	} else {
 		common_calc_clock (par->MCLK, 1, 1, 31, 0, 3, 135000, 270000,
 				   &par->SR11, &par->SR10);
+		par->SR10 = 0x0; par->SR11 = 0x0; /* TwisterP */
 		/*      par->SR10 = 80; // MCLK == 286000 */
 		/*      par->SR11 = 125; */
 	}

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