From: Eugene Surovegin Date: Wed, 6 Jul 2005 01:54:45 +0000 (-0700) Subject: [PATCH] ppc32: explicitly disable 440GP IRQ compatibility mode in 440GX setup X-Git-Tag: firefly_0821_release~43095 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=4b1294f928d9396e45f62b1c306ac8bf9fae036b;p=firefly-linux-kernel-4.4.55.git [PATCH] ppc32: explicitly disable 440GP IRQ compatibility mode in 440GX setup Add explicit disabling of 440GP IRQ compatibility mode when configuring 440GX interrupt controller. This helps when board firmware for some reason uses this compatibility mode and leaves it enabled. It breaks 440GX interrupt code because it assumes native 440GX IRQ mode. People seems to be continuously bitten by this. Signed-off-by: Eugene Surovegin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/arch/ppc/syslib/ppc4xx_pic.c b/arch/ppc/syslib/ppc4xx_pic.c index 05686fa73545..40086212b9c3 100644 --- a/arch/ppc/syslib/ppc4xx_pic.c +++ b/arch/ppc/syslib/ppc4xx_pic.c @@ -110,6 +110,10 @@ static int ppc4xx_pic_get_irq(struct pt_regs *regs) static void __init ppc4xx_pic_impl_init(void) { +#if defined(CONFIG_440GX) + /* Disable 440GP compatibility mode if it was enabled in firmware */ + SDR_WRITE(DCRN_SDR_MFR, SDR_READ(DCRN_SDR_MFR) & ~DCRN_SDR_MFR_PCM); +#endif /* Configure Base UIC */ mtdcr(DCRN_UIC_CR(UICB), 0); mtdcr(DCRN_UIC_TR(UICB), 0);