[PATCH] ARM: i.MX: Disable supervisor protect for i.MX51
Alexander Shiyan
shc_work at mail.ru
Fri Jun 24 22:26:15 PDT 2016
Most peripherals on the i.MX51 have an Off-Platform Peripheral Access
Control Register (OPACR) in which the access rights (together with the
MPROT registers) can be declared.
However, this does not seem to work for example for SSI1+SDMA, because the
supervisor bit is not set for the SDMA unit.
A similar problem was described in the patch for i.MX53 CPU
(ARM: i.MX53: globally disable supervisor protect), and the same solution
is applicable for i.MX51 CPU.
Patch has tested on custom board based on Digi CCMX-51 module (i.MX51).
Signed-off-by: Alexander Shiyan <shc_work at mail.ru>
---
DTS-part of this patch, I'll send a bit later.
Another mention of this problem: https://community.nxp.com/thread/333710
---
arch/arm/mach-imx/mach-imx51.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm/mach-imx/mach-imx51.c b/arch/arm/mach-imx/mach-imx51.c
index 10a82a4..1e91740 100644
--- a/arch/arm/mach-imx/mach-imx51.c
+++ b/arch/arm/mach-imx/mach-imx51.c
@@ -54,6 +54,8 @@ static void __init imx51_dt_init(void)
imx_src_init();
of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+
+ imx_aips_allow_unprivileged_access("fsl,imx51-aipstz");
}
static void __init imx51_init_late(void)
--
2.4.9
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