+From 84c06b4a1dfa3e021fdbcafaff8cebfdec462402 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= <noltari@gmail.com>
+Date: Tue, 23 Feb 2021 10:39:48 +0100
+Subject: [PATCH] mips: bmips: BCM6358: disable ARCH_HAS_SYNC_DMA_FOR_CPU_ALL
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Enabling this option causes kernel panics on BCM6358 with EHCI/OHCI:
+[ 3.881739] usb 1-1: new high-speed USB device number 2 using ehci-platform
+[ 3.895011] Reserved instruction in kernel code[#1]:
+[ 3.900113] CPU: 0 PID: 1 Comm: init Not tainted 5.10.16 #0
+[ 3.905829] $ 0 : 00000000 10008700 00000000 77d94060
+[ 3.911238] $ 4 : 7fd1f088 00000000 81431cac 81431ca0
+[ 3.916641] $ 8 : 00000000 ffffefff 8075cd34 00000000
+[ 3.922043] $12 : 806f8d40 f3e812b7 00000000 000d9aaa
+[ 3.927446] $16 : 7fd1f068 7fd1f080 7ff559b8 81428470
+[ 3.932848] $20 : 00000000 00000000 55590000 77d70000
+[ 3.938251] $24 : 00000018 00000010
+[ 3.943655] $28 : 81430000 81431e60 81431f28 800157fc
+[ 3.949058] Hi : 00000000
+[ 3.952013] Lo : 00000000
+[ 3.955019] epc : 80015808 setup_sigcontext+0x54/0x24c
+[ 3.960464] ra : 800157fc setup_sigcontext+0x48/0x24c
+[ 3.965913] Status: 10008703 KERNEL EXL IE
+[ 3.970216] Cause : 00800028 (ExcCode 0a)
+[ 3.974340] PrId : 0002a010 (Broadcom BMIPS4350)
+[ 3.979170] Modules linked in: ohci_platform ohci_hcd fsl_mph_dr_of ehci_platform ehci_fsl ehci_hcd gpio_button_hotplug usbcore nls_base usb_common
+[ 3.992907] Process init (pid: 1, threadinfo=(ptrval), task=(ptrval), tls=77e22ec8)
+[ 4.000776] Stack : 81431ef4 7fd1f080 81431f28 81428470 7fd1f068 81431edc 7ff559b8 81428470
+[ 4.009467] 81431f28 7fd1f080 55590000 77d70000 77d5498c 80015c70 806f0000 8063ae74
+[ 4.018149] 08100002 81431f28 0000000a 08100002 81431f28 0000000a 77d6b418 00000003
+[ 4.026831] ffffffff 80016414 80080734 81431ecc 81431ecc 00000001 00000000 04000000
+[ 4.035512] 77d54874 00000000 00000000 00000000 00000000 00000012 00000002 00000000
+[ 4.044196] ...
+[ 4.046706] Call Trace:
+[ 4.049238] [<80015808>] setup_sigcontext+0x54/0x24c
+[ 4.054356] [<80015c70>] setup_frame+0xdc/0x124
+[ 4.059015] [<80016414>] do_notify_resume+0x1dc/0x288
+[ 4.064207] [<80011b50>] work_notifysig+0x10/0x18
+[ 4.069036]
+[ 4.070538] Code: 8fc300b4 00001025 26240008 <ac820000> ac830004 3c048063 0c0228aa 24846a00 26240010
+[ 4.080686]
+[ 4.082517] ---[ end trace 22a8edb41f5f983b ]---
+[ 4.087374] Kernel panic - not syncing: Fatal exception
+[ 4.092753] Rebooting in 1 seconds..
+
+Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
+---
+ arch/mips/bmips/dma.c
+ arch/mips/bmips/setup.c
+
+--- a/arch/mips/bmips/dma.c
++++ b/arch/mips/bmips/dma.c
+@@ -19,6 +19,8 @@
+ #include <linux/types.h>
+ #include <asm/bmips.h>
+
++int bmips_dma_sync_enabled = 1;
++
+ /*
+ * BCM338x has configurable address translation windows which allow the
+ * peripherals' DMA addresses to be different from the Zephyr-visible
+@@ -69,6 +71,9 @@ void arch_sync_dma_for_cpu_all(void)
+ void __iomem *cbr = BMIPS_GET_CBR();
+ u32 cfg;
+
++ if (!bmips_dma_sync_enabled)
++ return;
++
+ if (boot_cpu_type() != CPU_BMIPS3300 &&
+ boot_cpu_type() != CPU_BMIPS4350 &&
+ boot_cpu_type() != CPU_BMIPS4380)
+--- a/arch/mips/bmips/setup.c
++++ b/arch/mips/bmips/setup.c
+@@ -89,6 +89,8 @@
+
+ #define DDR_CSEND_REG 0x8
+
++extern int bmips_dma_sync_enabled;
++
+ static const unsigned long kbase = VMLINUX_LOAD_ADDRESS & 0xfff00000;
+
+ struct bmips_cpufreq {
+@@ -168,6 +170,9 @@ static void bcm6358_quirks(void)
+ * disable SMP for now
+ */
+ bmips_smp_enabled = 0;
++
++ /* ARCH_HAS_SYNC_DMA_FOR_CPU_ALL causes kernel panics on BCM6358 */
++ bmips_dma_sync_enabled = 0;
+ }
+
+ static void bcm6368_quirks(void)
projects / openwrt / staging / ldir.git / blobdiff