[kernel] Revert some v3.16 changes to mach-highbank which broke L2 cache enablement.

[Kyle McMartin]

commit d6b86222cd06d4b4e428c0cc4bd0b6c072f32fea
Author: Kyle McMartin <kyle at fedoraproject.org>
Date:   Tue Sep 30 16:19:47 2014 -0400

    Revert some v3.16 changes to mach-highbank which broke L2 cache enablement.
    
      Will debug upstream separately, but we need F22/21 running there. (#1139762)

 arm-highbank-l2-reverts.patch |   47 +++++++++++++++++++++++++++++++++++++++++
 kernel.spec                   |    8 +++++++
 2 files changed, 55 insertions(+), 0 deletions(-)
---
diff --git a/arm-highbank-l2-reverts.patch b/arm-highbank-l2-reverts.patch
new file mode 100644
index 0000000..7e46d92
--- /dev/null
+++ b/arm-highbank-l2-reverts.patch
@@ -0,0 +1,47 @@
+diff --git a/arch/arm/mach-highbank/highbank.c b/arch/arm/mach-highbank/highbank.c
+index 8c35ae4..38e1dc3 100644
+--- a/arch/arm/mach-highbank/highbank.c
++++ b/arch/arm/mach-highbank/highbank.c
+@@ -51,13 +51,11 @@ static void __init highbank_scu_map_io(void)
+ }
+ 
+ 
+-static void highbank_l2c310_write_sec(unsigned long val, unsigned reg)
++static void highbank_l2x0_disable(void)
+ {
+-	if (reg == L2X0_CTRL)
+-		highbank_smc1(0x102, val);
+-	else
+-		WARN_ONCE(1, "Highbank L2C310: ignoring write to reg 0x%x\n",
+-			  reg);
++	outer_flush_all();
++	/* Disable PL310 L2 Cache controller */
++	highbank_smc1(0x102, 0x0);
+ }
+ 
+ static void __init highbank_init_irq(void)
+@@ -66,6 +64,14 @@ static void __init highbank_init_irq(void)
+ 
+ 	if (of_find_compatible_node(NULL, NULL, "arm,cortex-a9"))
+ 		highbank_scu_map_io();
++
++	/* Enable PL310 L2 Cache controller */
++	if (IS_ENABLED(CONFIG_CACHE_L2X0) &&
++	    of_find_compatible_node(NULL, NULL, "arm,pl310-cache")) {
++		highbank_smc1(0x102, 0x1);
++		l2x0_of_init(0, ~0);
++		outer_cache.disable = highbank_l2x0_disable;
++	}
+ }
+ 
+ static void highbank_power_off(void)
+@@ -179,9 +185,6 @@ DT_MACHINE_START(HIGHBANK, "Highbank")
+ #if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
+ 	.dma_zone_size	= (4ULL * SZ_1G),
+ #endif
+-	.l2c_aux_val	= 0,
+-	.l2c_aux_mask	= ~0,
+-	.l2c_write_sec	= highbank_l2c310_write_sec,
+ 	.init_irq	= highbank_init_irq,
+ 	.init_machine	= highbank_init,
+ 	.dt_compat	= highbank_match,
diff --git a/kernel.spec b/kernel.spec
index fb7782c..02a9f15 100644
--- a/kernel.spec
+++ b/kernel.spec
@@ -583,6 +583,8 @@ Patch21026: pinctrl-pinctrl-single-must-be-initialized-early.patch
 Patch21028: arm-i.MX6-Utilite-device-dtb.patch
 Patch21029: arm-dts-sun7i-bananapi.patch
 
+Patch21100: arm-highbank-l2-reverts.patch
+
 #rhbz 754518
 Patch21235: scsi-sd_revalidate_disk-prevent-NULL-ptr-deref.patch
 
@@ -1214,6 +1216,8 @@ ApplyPatch pinctrl-pinctrl-single-must-be-initialized-early.patch
 ApplyPatch arm-i.MX6-Utilite-device-dtb.patch
 ApplyPatch arm-dts-sun7i-bananapi.patch
 
+ApplyPatch arm-highbank-l2-reverts.patch
+
 #
 # bugfixes to drivers and filesystems
 #
@@ -2226,6 +2230,10 @@ fi
 #                                    ||----w |
 #                                    ||     ||
 %changelog
+* Tue Sep 30 2014 Kyle McMartin <kyle at fedoraproject.org>
+- Revert some v3.16 changes to mach-highbank which broke L2 cache enablement.
+  Will debug upstream separately, but we need F22/21 running there. (#1139762)
+
 * Tue Sep 30 2014 Peter Robinson <pbrobinson at fedoraproject.org>
 - Don't build Exynos4 on lpae kernel
 - Add dts for BananaPi