From: Fabio Estevam <fabio.estevam@xxxxxxx>
Configure the M4IF registers as per the vendor bootloader
to avoid visual artifacts during video playback.
This way we don't need to rely on the bootloader configuration for
optimal IPU/VPU bus priorities.
Signed-off-by: Fabio Estevam <fabio.estevam@xxxxxxx>
Tested-by: Sergey Lapin <sergey.lapin@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
---
Changes since v1:
- None
arch/arm/mach-imx/mach-imx51.c | 29 ++++++++++++++++++++++++++++-
1 file changed, 28 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mach-imx/mach-imx51.c b/arch/arm/mach-imx/mach-imx51.c
index 3835b6a..37ffdfa 100644
--- a/arch/arm/mach-imx/mach-imx51.c
+++ b/arch/arm/mach-imx/mach-imx51.c
@@ -12,6 +12,7 @@
#include <linux/io.h>
#include <linux/irq.h>
+#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <asm/mach/arch.h>
@@ -48,11 +49,37 @@ static void __init imx51_ipu_mipi_setup(void)
iounmap(hsc_addr);
}
+static void __init imx51_m4if_setup(void)
+{
+ void __iomem *m4if_base;
+ struct device_node *np;
+
+ np = of_find_compatible_node(NULL, NULL, "fsl,imx51-m4if");
+ if (!np)
+ return;
+
+ m4if_base = of_iomap(np, 0);
+ if (!m4if_base) {
+ pr_err("Unable to map M4IF registers\n");
+ return;
+ }
+
+ /*
+ * Configure VPU and IPU with higher priorities
+ * in order to avoid artifacts during video playback
+ */
+ writel_relaxed(0x00000203, m4if_base + 0x40);
+ writel_relaxed(0x00000000, m4if_base + 0x44);
+ writel_relaxed(0x00120125, m4if_base + 0x9c);
+ writel_relaxed(0x001901A3, m4if_base + 0x48);
+ iounmap(m4if_base);
+}
+
static void __init imx51_dt_init(void)
{
imx51_ipu_mipi_setup();
imx_src_init();
-
+ imx51_m4if_setup();
imx_aips_allow_unprivileged_access("fsl,imx51-aipstz");
}
--
2.7.4
--
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