fbdev: Set correct mclk/xclk values for aty in ibook

PATCH In review Antonino A. Daplas 1 participant 2 messages Nov 2, 2004 Framebuffer layer

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Antonino A. Daplas

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2004-11-02 11:47 UTC #0 lore raw

PATCH 8/8 fbdev: Set correct mclk/xclk values for aty in ibook

The first iBook needs special mclk/xclk values, or the screen will show only garbage. A patch like this went into 2.4.23. It stopped working after 2.6.10-rc1.

http://linux.bkbits.net:8080/linux-2.4/cset@3f966ca7mqKxZorh7Uw2SBAuVbv3mA

It was discussed here:
http://marc.theaimsgroup.com/?t=106345749200001&r=1&w=4

Signed-off-by Olaf Hering <[email protected]>

Signed-off-by Antonino Daplas <[email protected]>

---

 atyfb_base.c |    8 ++++++++
 1 files changed, 8 insertions(+)

drivers/video/aty/atyfb_base.c +8 -0

diff -Nru a/drivers/video/aty/atyfb_base.c b/drivers/video/aty/atyfb_base.c
@@ -2191,6 +2191,14 @@
 	par->aty_cmap_regs =
 	    (struct aty_cmap_regs __iomem *) (par->ati_regbase + 0xc0);
 
+#ifdef CONFIG_PPC_PMAC
+	/* The Apple iBook1 uses non-standard memory frequencies. We detect it
+	 * and set the frequency manually. */
+	if (machine_is_compatible("PowerBook2,1")) {
+		par->pll_limits.mclk =3D 70;
+		par->pll_limits.xclk =3D 53;
+	}
+#endif
 	if (pll)
 		par->pll_limits.pll_max = pll;
 	if (mclk)

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