The NoC regulator only passes the QoS signals through if it is
in bypass mode. This is a safe setting to give the IPU priority
over other requests. The kernel may change it to some other setting
once it knows the bandwidth requirements of the use-case.

Signed-off-by: Lucas Stach <l.st...@pengutronix.de>
---
 arch/arm/mach-imx/imx6.c                   | 11 +++++++++++
 arch/arm/mach-imx/include/mach/imx6-regs.h |  3 +++
 2 files changed, 14 insertions(+)

diff --git a/arch/arm/mach-imx/imx6.c b/arch/arm/mach-imx/imx6.c
index 567559033770..f90eec8bd2c8 100644
--- a/arch/arm/mach-imx/imx6.c
+++ b/arch/arm/mach-imx/imx6.c
@@ -97,6 +97,7 @@ void imx6_init_lowlevel(void)
 void imx6_setup_ipu_qos(void)
 {
        void __iomem *iomux = (void *)MX6_IOMUXC_BASE_ADDR;
+       void __iomem *fast2 = (void *)MX6_FAST2_BASE_ADDR;
        uint32_t val;
 
        if (!cpu_mx6_is_mx6q() && !cpu_mx6_is_mx6d() &&
@@ -119,6 +120,16 @@ void imx6_setup_ipu_qos(void)
        val &= ~(IMX6Q_GPR7_IPU2_ID00_RD_QOS_MASK | 
IMX6Q_GPR7_IPU2_ID01_RD_QOS_MASK);
        val |= (0xf << 16) | (0x7 << 20);
        writel(val, iomux + IOMUXC_GPR7);
+
+       /*
+        * On i.MX6 QP/DP the NoC regulator for the IPU ports needs to be in
+        * bypass mode for the above settings to take effect.
+        */
+       if ((cpu_mx6_is_mx6q() || cpu_mx6_is_mx6d()) &&
+           imx_silicon_revision() >= IMX_CHIP_REV_2_0) {
+               writel(0x2, fast2 + 0xb048c);
+               writel(0x2, fast2 + 0xb050c);
+       }
 }
 
 int imx6_init(void)
diff --git a/arch/arm/mach-imx/include/mach/imx6-regs.h 
b/arch/arm/mach-imx/include/mach/imx6-regs.h
index 68be43c9ab5b..e661c4ed120b 100644
--- a/arch/arm/mach-imx/include/mach/imx6-regs.h
+++ b/arch/arm/mach-imx/include/mach/imx6-regs.h
@@ -3,6 +3,9 @@
 
 #define MX6_GPMI_BASE_ADDR             0x00112000
 
+#define MX6_FAST1_BASE_ADDR            0x00c00000
+#define MX6_FAST2_BASE_ADDR            0x00b00000
+
 #define MX6_AIPS1_ARB_BASE_ADDR                0x02000000
 #define MX6_AIPS2_ARB_BASE_ADDR                0x02100000
 
-- 
2.8.1


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