From 2b3a1cdd9ed14441ae91845851aaf91adddbafc0 Mon Sep 17 00:00:00 2001
From: Kumar Gala <galak@kernel.crashing.org>
Date: Mon, 3 Oct 2011 08:37:57 -0500
Subject: [PATCH] powerpc/mpc8548: Add workaround for erratum NMG_LBC103
The erratum NMG_LBC103 is LBIU3 in MPC8548 errata document.
Any local bus transaction may fail during LBIU resynchronization
process when the clock divider [CLKDIV] is changing. Ensure there
is no transaction on the local bus for at least 100 microseconds
after changing clock divider LCRR[CLKDIV].
Refer to the erratum LBIU3 of mpc8548.
Signed-off-by: Zhao Chenhui <chenhui.zhao@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
---
arch/powerpc/cpu/mpc85xx/cmd_errata.c | 3 +++
arch/powerpc/cpu/mpc85xx/cpu_init.c | 3 +++
arch/powerpc/include/asm/config_mpc85xx.h | 1 +
3 files changed, 7 insertions(+)
diff --git a/arch/powerpc/cpu/mpc85xx/cmd_errata.c b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
index f0fa0f565eb..a09eb914068 100644
--- a/arch/powerpc/cpu/mpc85xx/cmd_errata.c
+++ b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
@@ -99,6 +99,9 @@ static int do_errata(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
#ifdef CONFIG_SYS_FSL_ERRATUM_NMG_DDR120
if ((SVR_MAJ(svr) == 1) || IS_SVR_REV(svr, 2, 0))
puts("Work-around for Erratum NMG DDR120 enabled\n");
+#endif
+#ifdef CONFIG_SYS_FSL_ERRATUM_NMG_LBC103
+ puts("Work-around for Erratum NMG_LBC103 enabled\n");
#endif
return 0;
}
diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init.c b/arch/powerpc/cpu/mpc85xx/cpu_init.c
index e2c5b6fc3e2..0a4ce538f3b 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu_init.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c
@@ -463,6 +463,9 @@ skip_l2:
clrsetbits_be32(&lbc->lcrr, LCRR_CLKDIV, CONFIG_SYS_LBC_LCRR);
__raw_readl(&lbc->lcrr);
isync();
+#ifdef CONFIG_SYS_FSL_ERRATUM_NMG_LBC103
+ udelay(100);
+#endif
#endif
#ifdef CONFIG_SYS_FSL_USB1_PHY_ENABLE
diff --git a/arch/powerpc/include/asm/config_mpc85xx.h b/arch/powerpc/include/asm/config_mpc85xx.h
index a0a12b23e77..fc78c58d036 100644
--- a/arch/powerpc/include/asm/config_mpc85xx.h
+++ b/arch/powerpc/include/asm/config_mpc85xx.h
@@ -63,6 +63,7 @@
#define CONFIG_SYS_FSL_SEC_COMPAT 2
#define CONFIG_SYS_CCSRBAR_DEFAULT 0xff700000
#define CONFIG_SYS_FSL_ERRATUM_NMG_DDR120
+#define CONFIG_SYS_FSL_ERRATUM_NMG_LBC103
#elif defined(CONFIG_MPC8555)
#define CONFIG_MAX_CPUS 1
--
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