add a patch to fixup pcie reset on kirkwood - also fixes the boot issue on the wrt350n v2

SVN-Revision: 23939

1 files changed, 86 insertions, 0 deletions

diff --git a/target/linux/generic/patches-2.6.36/989-kirkwood_pcie_reset_fixup.patch b/target/linux/generic/patches-2.6.36/989-kirkwood_pcie_reset_fixup.patch
new file mode 100644
index 0000000000..f8ecc303de
--- /dev/null
+++ b/target/linux/generic/patches-2.6.36/989-kirkwood_pcie_reset_fixup.patch
@@ -0,0 +1,86 @@
+From 3924996bab2845bdf9a9d16ff7c20445de1ab55d Mon Sep 17 00:00:00 2001
+From: Nicolas Pitre <nico@fluxnic.net>
+Date: Thu, 21 Oct 2010 15:48:33 -0400
+Subject: [PATCH] [ARM] Kirkwood: restrict the scope of the PCIe reset workaround
+
+Commit 21f0ba90a447 "orion/kirkwood: reset PCIe unit on boot" made the
+reset of the PCIe unit unconditional.  While this may fix problems on some
+targets, this also causes problems on other targets.
+
+Saeed Bishara <saeed@marvell.com> said about the original problem: "We
+couln't pinpoint the root cause of this issue, actually we failed to
+reproduce that issue."
+
+So let's restrict the reset of the PCIe unit only to the target where
+the original problem was observed.
+
+Signed-off-by: Nicolas Pitre <nico@fluxnic.net>
+---
+ arch/arm/mach-kirkwood/ts41x-setup.c    |   14 +++++++++++++-
+ arch/arm/plat-orion/include/plat/pcie.h |    3 +++
+ arch/arm/plat-orion/pcie.c              |    5 -----
+ 3 files changed, 16 insertions(+), 6 deletions(-)
+
+--- a/arch/arm/mach-kirkwood/ts41x-setup.c
++++ b/arch/arm/mach-kirkwood/ts41x-setup.c
+@@ -27,6 +27,10 @@
+ #include "mpp.h"
+ #include "tsx1x-common.h"
+ 
++/* for the PCIe reset workaround */
++#include <plat/pcie.h>
++
++
+ #define QNAP_TS41X_JUMPER_JP1	45
+ 
+ static struct i2c_board_info __initdata qnap_ts41x_i2c_rtc = {
+@@ -140,8 +144,16 @@ static void __init qnap_ts41x_init(void)
+ 
+ static int __init ts41x_pci_init(void)
+ {
+-	if (machine_is_ts41x())
++	if (machine_is_ts41x()) {
++		/*
++		 * Without this explicit reset, the PCIe SATA controller
++		 * (Marvell 88sx7042/sata_mv) is known to stop working
++		 * after a few minutes.
++		 */
++		orion_pcie_reset((void __iomem *)PCIE_VIRT_BASE);
++
+ 		kirkwood_pcie_init(KW_PCIE0);
++	}
+ 
+    return 0;
+ }
+--- a/arch/arm/plat-orion/include/plat/pcie.h
++++ b/arch/arm/plat-orion/include/plat/pcie.h
+@@ -11,12 +11,15 @@
+ #ifndef __PLAT_PCIE_H
+ #define __PLAT_PCIE_H
+ 
++struct pci_bus;
++
+ u32 orion_pcie_dev_id(void __iomem *base);
+ u32 orion_pcie_rev(void __iomem *base);
+ int orion_pcie_link_up(void __iomem *base);
+ int orion_pcie_x4_mode(void __iomem *base);
+ int orion_pcie_get_local_bus_nr(void __iomem *base);
+ void orion_pcie_set_local_bus_nr(void __iomem *base, int nr);
++void orion_pcie_reset(void __iomem *base);
+ void orion_pcie_setup(void __iomem *base,
+ 		      struct mbus_dram_target_info *dram);
+ int orion_pcie_rd_conf(void __iomem *base, struct pci_bus *bus,
+--- a/arch/arm/plat-orion/pcie.c
++++ b/arch/arm/plat-orion/pcie.c
+@@ -182,11 +182,6 @@ void __init orion_pcie_setup(void __iome
+ 	u32 mask;
+ 
+ 	/*
+-	 * soft reset PCIe unit
+-	 */
+-	orion_pcie_reset(base);
+-
+-	/*
+ 	 * Point PCIe unit MBUS decode windows to DRAM space.
+ 	 */
+ 	orion_pcie_setup_wins(base, dram);