Hi Shawn,
Subject here should be [PATCH v2 3/3], sorry.
On Mon, Jul 9, 2018 at 3:19 PM, Fabio Estevam <festevam@xxxxxxxxx> wrote:
> 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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