sunxi: add initial 3.18 support

Signed-off-by: Zoltan HERPAI <wigyori@uid0.hu>

SVN-Revision: 43337

1 files changed, 97 insertions, 0 deletions

diff --git a/target/linux/sunxi/patches-3.18/135-ahci-fix-threaded-interrupt-setup.patch b/target/linux/sunxi/patches-3.18/135-ahci-fix-threaded-interrupt-setup.patch
new file mode 100644
index 0000000000..6d316c2053
--- /dev/null
+++ b/target/linux/sunxi/patches-3.18/135-ahci-fix-threaded-interrupt-setup.patch
@@ -0,0 +1,97 @@
+From 4bfd40ed0046299e4a5ffba31bfbbcc39cf74e03 Mon Sep 17 00:00:00 2001
+From: Marc Zyngier <marc.zyngier@arm.com>
+Date: Thu, 23 Oct 2014 17:49:30 +0100
+Subject: [PATCH] AHCI: Fix threaded interrupt setup
+
+Commit 18dcf433f3de (AHCI: Optimize single IRQ interrupt processing)
+switched the single IRQ case of the AHCI driver to use threaded
+threaded interrupts.
+
+During this conversion, only the IRQF_SHARED flag was provided. The net
+effect of this in the presence of level interrupts is that the
+interrupt will not be masked during the execution of the treaded
+handler, leading to a screaming interrupt if the thread is not
+scheduled quickly enough, specially in error conditions:
+
+[    2.728051] ahci-sunxi 1c18000.sata: controller can't do PMP, turning off CAP_PMP
+[    2.735578] ahci-sunxi 1c18000.sata: SSS flag set, parallel bus scan disabled
+[    2.742792] ahci-sunxi 1c18000.sata: AHCI 0001.0100 32 slots 1 ports 3 Gbps 0x1 impl platform mode
+[    2.751789] ahci-sunxi 1c18000.sata: flags: ncq sntf stag pm led clo only pio slum part ccc
+[    2.761539] scsi host0: ahci_platform
+[    2.765754] ata1: SATA max UDMA/133 mmio [mem 0x01c18000-0x01c18fff] port 0x100 irq 88
+[...]
+[    3.127977] ata1: SATA link down (SStatus 0 SControl 300)
+[...]
+[    3.162035] Waiting for root device /dev/sda1...
+[    3.163700] random: nonblocking pool is initialized
+[    3.326593] irq 88: nobody cared (try booting with the "irqpoll" option)
+[    3.333296] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.18.0-rc1+ #3077
+[    3.339936] [<c002b318>] (unwind_backtrace) from [<c0026980>] (show_stack+0x20/0x24)
+[    3.347681] [<c0026980>] (show_stack) from [<c067dd18>] (dump_stack+0x9c/0xd4)
+[    3.354904] [<c067dd18>] (dump_stack) from [<c007ac08>] (__report_bad_irq+0x38/0xd4)
+[    3.362643] [<c007ac08>] (__report_bad_irq) from [<c007b1dc>] (note_interrupt+0x280/0x2d0)
+[    3.370903] [<c007b1dc>] (note_interrupt) from [<c0078a70>] (handle_irq_event_percpu+0x210/0x27c)
+[    3.379771] [<c0078a70>] (handle_irq_event_percpu) from [<c0078b28>] (handle_irq_event+0x4c/0x6c)
+[    3.388636] [<c0078b28>] (handle_irq_event) from [<c007b860>] (handle_fasteoi_irq+0xbc/0x1a0)
+[    3.397156] [<c007b860>] (handle_fasteoi_irq) from [<c0077f5c>] (generic_handle_irq+0x3c/0x4c)
+[    3.405764] [<c0077f5c>] (generic_handle_irq) from [<c0078220>] (__handle_domain_irq+0x6c/0xb4)
+[    3.414456] [<c0078220>] (__handle_domain_irq) from [<c0008754>] (gic_handle_irq+0x34/0x6c)
+[    3.422802] [<c0008754>] (gic_handle_irq) from [<c0027540>] (__irq_svc+0x40/0x74)
+[    3.430274] Exception stack(0xc09c1df8 to 0xc09c1e40)
+[    3.435321] 1de0:                                                       00000001 c0a27ec0
+[    3.443491] 1e00: 00000000 00000000 c09c0028 0000001e 00000282 00000000 ee00c400 c0a239f8
+[    3.451660] 1e20: c09c0000 c09c1ea4 c0a27ec0 c09c1e40 00200000 c003c7cc 20000113 ffffffff
+[    3.459835] [<c0027540>] (__irq_svc) from [<c003c7cc>] (__do_softirq+0xbc/0x34c)
+[    3.467229] [<c003c7cc>] (__do_softirq) from [<c003cd44>] (irq_exit+0xbc/0x104)
+[    3.474536] [<c003cd44>] (irq_exit) from [<c0078224>] (__handle_domain_irq+0x70/0xb4)
+[    3.482362] [<c0078224>] (__handle_domain_irq) from [<c0008754>] (gic_handle_x74)
+[    3.498169] Exception stack(0xc09c1f10 to 0xc09c1f58)
+[    3.503216] 1f00:                                     ee7ca310 00000000 00000ab4 c0035560
+[    3.511386] 1f20: c09c0000 00000000 c0a23f84 c09c8474 c09c84bc c09c0000 c0688bf8 c09c1f64
+[    3.519554] 1f40: c09c1f68 c09c1f58 c00235d8 c00235dc 60000113 ffffffff
+[    3.526165] [<c0027540>] (__irq_svc) from [<c00235dc>] (arch_cpu_idle+0x48/0x4c)
+[    3.533557] [<c00235dc>] (arch_cpu_idle) from [<c00701fc>] (cpu_startup_entry+0x13c/0x27c)
+[    3.541816] [<c00701fc>] (cpu_startup_entry) from [<c067af1c>] (rest_init+0x94/0x98)
+[    3.549557] [<c067af1c>] (rest_init) from [<c093dd38>] (start_kernel+0x3f0/0x3fc)
+[    3.557036] [<c093dd38>] (start_kernel) from [<40008084>] (0x40008084)
+[    3.563555] handlers:
+[    3.565830] [<c03a1a80>] ahci_single_irq_intr threaded [<c03a223c>] ahci_thread_fn
+[    3.573415] Disabling IRQ #88
+[    3.576532] ata1: exception Emask 0x10 SAct 0x0 SErr 0x4050002 action 0xe frozen
+[    3.583977] ata1: irq_stat 0x00400040, connection status changed
+[    3.590006] ata1: SError: { RecovComm PHYRdyChg CommWake DevExch }
+[    3.596209] ata1: hard resetting link
+[...]
+
+Not good. The culprit is a missing IRQF_ONESHOT flag, which addition
+solves the problem entierly. The number of interrupts drops radically:
+
+[Booting Debian Jessie to a prompt]
+Before fix:
+ 88:       3562          0       GIC  88  ahci-sunxi
+After fix:
+ 88:       1992          0       GIC  88  ahci-sunxi
+
+Tested on a A20 board (ahci-sunxi).
+
+Cc: Alexander Gordeev <agordeev@redhat.com>
+Cc: Tejun Heo <tj@kernel.org>
+Cc: linux-ide@vger.kernel.org
+Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
+---
+ drivers/ata/libahci.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
+index 5eb61c9..49c649f 100644
+--- a/drivers/ata/libahci.c
++++ b/drivers/ata/libahci.c
+@@ -2492,7 +2492,7 @@ static int ahci_host_activate_single_irq(struct ata_host *host, int irq,
+ 		return rc;
+ 
+ 	rc = devm_request_threaded_irq(host->dev, irq, ahci_single_irq_intr,
+-				       ahci_thread_fn, IRQF_SHARED,
++				       ahci_thread_fn, IRQF_SHARED | IRQF_ONESHOT,
+ 				       dev_driver_string(host->dev), host);
+ 	if (rc)
+ 		return rc;