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Date: Sun, 25 Jul 2010 18:52:30 +0200 From: Ondrej Zary <linux@...nbow-software.org> To: Russell King <linux@....linux.org.uk> Cc: linux-fbdev@...r.kernel.org, Kernel development list <linux-kernel@...r.kernel.org> Subject: [PATCH] cyber2000fb: fix machine hang on module load Hello, I was testing two CyberPro 2000 based PCI cards on x86 and the machine always hanged completely when the cyber2000fb module was loaded. It seems that the card hangs when some registers are accessed too quickly after writing RAMDAC control register. With this patch, both card work. Add delay after RAMDAC control register write to prevent hangs on module load. Signed-off-by: Ondrej Zary <linux@...nbow-software.org> --- linux-2.6.35-rc2/drivers/video/cyber2000fb.c 2010-06-06 05:43:24.000000000 +0200 +++ linux-2.6.35-rc3/drivers/video/cyber2000fb.c 2010-07-25 18:20:47.000000000 +0200 @@ -436,6 +436,7 @@ static void cyber2000fb_write_ramdac_ctr cyber2000fb_writeb(i | 4, 0x3cf, cfb); cyber2000fb_writeb(val, 0x3c6, cfb); cyber2000fb_writeb(i, 0x3cf, cfb); + udelay(1); } static void cyber2000fb_set_timing(struct cfb_info *cfb, struct par_info *hw) -- Ondrej Zary -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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