From mboxrd@z Thu Jan 1 00:00:00 1970 From: shc_work@mail.ru (Alexander Shiyan) Date: Sat, 25 Jun 2016 08:26:15 +0300 Subject: [PATCH] ARM: i.MX: Disable supervisor protect for i.MX51 Message-ID: <1466832375-32071-1-git-send-email-shc_work@mail.ru> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 --- 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