Am Montag, den 11.02.2019, 18:36 -0800 schrieb Andrey Smirnov:
> Port code found in cdn_dp_load_firmware() in Linux kernel to check if
> HDMI firmware is running and, if so, report its version.
>
> > Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
> ---
> arch/arm/mach-imx/imx8mq.c | 37 +++++++++++++++++++++++++++++++++++++
> 1 file changed, 37 insertions(+)
>
> diff --git a/arch/arm/mach-imx/imx8mq.c b/arch/arm/mach-imx/imx8mq.c
> index 4d00da5f0..18822333c 100644
> --- a/arch/arm/mach-imx/imx8mq.c
> +++ b/arch/arm/mach-imx/imx8mq.c
> @@ -21,6 +21,7 @@
> #include <mach/imx8mq.h>
> #include <mach/reset-reason.h>
>
> +#include <linux/iopoll.h>
> #include <linux/arm-smccc.h>
>
> > #define FSL_SIP_BUILDINFO 0xC2000003
> @@ -81,3 +82,39 @@ int imx8mq_init(void)
>
> > return 0;
> }
> +
> > +#define KEEP_ALIVE 0x18
> > +#define VER_L 0x1c
> > +#define VER_H 0x20
> > +#define VER_LIB_L_ADDR 0x24
> > +#define VER_LIB_H_ADDR 0x28
> > +#define FW_ALIVE_TIMEOUT_US 100000
> +
> +static int imx8mq_report_hdmi_firmware(void)
> +{
> > + void __iomem *hdmi = IOMEM(MX8MQ_HDMI_CTRL_BASE_ADDR);
> > + u16 ver_lib, ver;
> > + u32 reg;
> > + int ret;
> +
This is missing a check to bail out if we aren't running on a i.MX8MQ.
> + /* check the keep alive register to make sure fw working */
> > + ret = readl_poll_timeout(hdmi + KEEP_ALIVE,
> > + reg, reg, FW_ALIVE_TIMEOUT_US);
> > + if (ret < 0) {
> > + pr_info("HDMI firmware is not running\n");
> > + return 0;
> > + }
> +
> > + ver = readl(hdmi + VER_H) & 0xff;
> > + ver <<= 8;
> > + ver |= readl(hdmi + VER_L) & 0xff;
> +
> > + ver_lib = readl(hdmi + VER_LIB_H_ADDR) & 0xff;
> > + ver_lib <<= 8;
> > + ver_lib |= readl(hdmi + VER_LIB_L_ADDR) & 0xff;
> +
> + pr_info("HDMI firmware ver: %d ver_lib: %d\n", ver, ver_lib);
Maybe "HDMI TX" or "HDP" here, as this should equally apply to eDP
firmware, right?
Regards,
Lucas
> +
> > + return 0;
> +}
> +console_initcall(imx8mq_report_hdmi_firmware);
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