The patch titled
atyfb: system hangs at bootup prior to enabling framebuffer console
has been added to the -mm tree. Its filename is
atyfb-system-hangs-at-bootup-prior-to-enabling-framebuffer-console.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: atyfb: system hangs at bootup prior to enabling framebuffer console
From: Ville Syrjala <syrjala@xxxxxx>
More than 50% of the time my laptop hangs when booting with
... video=atyfb:1400x1050.
I have seen similar occurrences reported here and there with recent 2.6
kernels but nothing very clear as to whether this is a known problem or
whether a patch or workaround has already been provided.
I was just able to reproduce the problem by switching from drivers/ide
to libata. In my case the laptop would hang on every boot. Apparently
using libata changed the timing enough to trigger the bug.
Cc "Antonino A. Daplas" <adaplas@xxxxxxx>
Acked-by: James Simmons <jsimmons@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/video/aty/mach64_ct.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff -puN drivers/video/aty/mach64_ct.c~atyfb-system-hangs-at-bootup-prior-to-enabling-framebuffer-console drivers/video/aty/mach64_ct.c
--- a/drivers/video/aty/mach64_ct.c~atyfb-system-hangs-at-bootup-prior-to-enabling-framebuffer-console
+++ a/drivers/video/aty/mach64_ct.c
@@ -598,7 +598,6 @@ static void aty_resume_pll_ct(const stru
struct atyfb_par *par = info->par;
if (par->mclk_per != par->xclk_per) {
- int i;
/*
* This disables the sclk, crashes the computer as reported:
* aty_st_pll_ct(SPLL_CNTL2, 3, info);
@@ -609,12 +608,10 @@ static void aty_resume_pll_ct(const stru
aty_st_pll_ct(SCLK_FB_DIV, pll->ct.sclk_fb_div, par);
aty_st_pll_ct(SPLL_CNTL2, pll->ct.spll_cntl2, par);
/*
- * The sclk has been started. However, I believe the first clock
- * ticks it generates are not very stable. Hope this primitive loop
- * helps for Rage Mobilities that sometimes crash when
- * we switch to sclk. (Daniel Mantione, 13-05-2003)
+ * The sclk has been started. Wait for the PLL to lock. 5 ms
+ * should be enough according to mach64 programmers guide.
*/
- for (i=0;i<=0x1ffff;i++);
+ mdelay(5);
}
aty_st_pll_ct(PLL_REF_DIV, pll->ct.pll_ref_div, par);
_
Patches currently in -mm which might be from syrjala@xxxxxx are
atyfb-system-hangs-at-bootup-prior-to-enabling-framebuffer-console.patch
-
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