ARM: OMAP2+: Fix oops with LPAE and more than 2GB of memory

On boards with more than 2GB of RAM booting goes wrong with things not
working and we're getting lots of l3 warnings:

WARNING: CPU: 0 PID: 1 at drivers/bus/omap_l3_noc.c:147
l3_interrupt_handler+0x260/0x384()
44000000.ocp:L3 Custom Error: MASTER MMC6 TARGET DMM1 (Idle):
Data Access in User mode during Functional access
...
[<c044e158>] (scsi_add_host_with_dma) from [<c04705c8>]
(ata_scsi_add_hosts+0x5c/0x18c)
[<c04705c8>] (ata_scsi_add_hosts) from [<c046b13c>]
(ata_host_register+0x150/0x2cc)
[<c046b13c>] (ata_host_register) from [<c046b38c>]
(ata_host_activate+0xd4/0x124)
[<c046b38c>] (ata_host_activate) from [<c047f42c>]
(ahci_host_activate+0x5c/0x194)
[<c047f42c>] (ahci_host_activate) from [<c0480854>]
(ahci_platform_init_host+0x1f0/0x3f0)
[<c0480854>] (ahci_platform_init_host) from [<c047c9dc>]
(ahci_probe+0x70/0x98)
[<c047c9dc>] (ahci_probe) from [<c04220cc>]
(platform_drv_probe+0x54/0xb4)

Let's fix the issue by enabling ZONE_DMA for LPAE. Note that we need to
limit dma_zone_size to 2GB as the rest of the RAM is beyond the 4GB limit.

Let's also fix things for dra7 as done in similar patches in the TI tree
by Lokesh Vutla <lokeshvutla@ti.com>.

Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig
index b3a0dff..33d1460 100644 (file)
--- a/arch/arm/mach-omap2/Kconfig
+++ b/arch/arm/mach-omap2/Kconfig
@@ -49,6 +49,7 @@ config SOC_OMAP5
        select OMAP_INTERCONNECT
        select OMAP_INTERCONNECT_BARRIER
        select PM_OPP if PM
+       select ZONE_DMA if ARM_LPAE
 
 config SOC_AM33XX
        bool "TI AM33XX"
@@ -78,6 +79,7 @@ config SOC_DRA7XX
        select OMAP_INTERCONNECT
        select OMAP_INTERCONNECT_BARRIER
        select PM_OPP if PM
+       select ZONE_DMA if ARM_LPAE
 
 config ARCH_OMAP2PLUS
        bool

diff --git a/arch/arm/mach-omap2/board-generic.c b/arch/arm/mach-omap2/board-generic.c
index 6133eaa..6b59230 100644 (file)
--- a/arch/arm/mach-omap2/board-generic.c
+++ b/arch/arm/mach-omap2/board-generic.c
@@ -243,6 +243,9 @@ static const char *const omap5_boards_compat[] __initconst = {
 };
 
 DT_MACHINE_START(OMAP5_DT, "Generic OMAP5 (Flattened Device Tree)")
+#if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
+       .dma_zone_size  = SZ_2G,
+#endif
        .reserve        = omap_reserve,
        .smp            = smp_ops(omap4_smp_ops),
        .map_io         = omap5_map_io,
@@ -288,6 +291,9 @@ static const char *const dra74x_boards_compat[] __initconst = {
 };
 
 DT_MACHINE_START(DRA74X_DT, "Generic DRA74X (Flattened Device Tree)")
+#if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
+       .dma_zone_size  = SZ_2G,
+#endif
        .reserve        = omap_reserve,
        .smp            = smp_ops(omap4_smp_ops),
        .map_io         = dra7xx_map_io,
@@ -308,6 +314,9 @@ static const char *const dra72x_boards_compat[] __initconst = {
 };
 
 DT_MACHINE_START(DRA72X_DT, "Generic DRA72X (Flattened Device Tree)")
+#if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
+       .dma_zone_size  = SZ_2G,
+#endif
        .reserve        = omap_reserve,
        .map_io         = dra7xx_map_io,
        .init_early     = dra7xx_init_early,