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authorShengzhou Liu <Shengzhou.Liu@freescale.com>2011-05-19 18:48:01 +0800
committerKumar Gala <galak@kernel.crashing.org>2011-05-20 08:46:49 -0500
commitd08e44570ed611c527a1062eb4f8c6ac61832e6e (patch)
treeed808ac6e887995a5d7dd9c6b2ed6c355deaa000 /arch/powerpc/sysdev/fsl_lbc.c
parent208b3a4c196e733b9cec006dc132cfc149b2810a (diff)
downloadlinux-d08e44570ed611c527a1062eb4f8c6ac61832e6e.tar.bz2
powerpc/fsl_lbc: Add workaround for ELBC-A001 erratum
Simultaneous FCM and GPCM or UPM operation may erroneously trigger bus monitor timeout. Set the local bus monitor timeout value to the maximum by setting LBCR[BMT] = 0 and LBCR[BMTPS] = 0xF. Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/sysdev/fsl_lbc.c')
-rw-r--r--arch/powerpc/sysdev/fsl_lbc.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/powerpc/sysdev/fsl_lbc.c b/arch/powerpc/sysdev/fsl_lbc.c
index 4fcb5a4e60dd..0608b1657da4 100644
--- a/arch/powerpc/sysdev/fsl_lbc.c
+++ b/arch/powerpc/sysdev/fsl_lbc.c
@@ -184,7 +184,8 @@ int fsl_upm_run_pattern(struct fsl_upm *upm, void __iomem *io_base, u32 mar)
}
EXPORT_SYMBOL(fsl_upm_run_pattern);
-static int __devinit fsl_lbc_ctrl_init(struct fsl_lbc_ctrl *ctrl)
+static int __devinit fsl_lbc_ctrl_init(struct fsl_lbc_ctrl *ctrl,
+ struct device_node *node)
{
struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
@@ -198,6 +199,10 @@ static int __devinit fsl_lbc_ctrl_init(struct fsl_lbc_ctrl *ctrl)
/* Enable interrupts for any detected events */
out_be32(&lbc->lteir, LTEIR_ENABLE);
+ /* Set the monitor timeout value to the maximum for erratum A001 */
+ if (of_device_is_compatible(node, "fsl,elbc"))
+ clrsetbits_be32(&lbc->lbcr, LBCR_BMT, LBCR_BMTPS);
+
return 0;
}
@@ -304,7 +309,7 @@ static int __devinit fsl_lbc_ctrl_probe(struct platform_device *dev)
fsl_lbc_ctrl_dev->dev = &dev->dev;
- ret = fsl_lbc_ctrl_init(fsl_lbc_ctrl_dev);
+ ret = fsl_lbc_ctrl_init(fsl_lbc_ctrl_dev, dev->dev.of_node);
if (ret < 0)
goto err;