Re: [PATCH V4 3/7] rockchip: boot_mode: Allow rockchip_dnl_key_pressed() in SPL

[Chris Morgan <macroalpha82@gmail.com>]

On Thu, Jan 18, 2024 at 03:20:52PM +0800, Kever Yang wrote:
> Hi Chris,
> 
> On 2024/1/2 23:46, Chris Morgan wrote:
> > From: Chris Morgan <macromorgan@hotmail.com>
> > 
> > Update the rockchip_dnl_key_pressed() so that it can run in
> > SPL. Also change the ADC channel to a define that can be
> > overridden by a board specific option.
> 
> I should ask this earlier.
> 
> Why you have to enable the download key in SPL?
> 
> This works for a long time in U-Boot proper, both mainline and downstream
> vendor U-Boot,
> 
> no one is detect this download key in SPL.
> 
> In theory the SPL can implement all the feature which is available in U-Boot
> proper,
> 
> but it would be better to make the SPL focus on the job it should be done
> and keep as small as possible.
> 

I wanted this code to run as soon as possible in the event of a bad
write. I have some devices which lack a way to bypass the eMMC in the
boot path; the fear is that if an SPL stage is written with a good
header but a bad payload (or if the A-TF does something wrong) the
device will become unbootable. If we can't do it this way for
all Rockchip boards that's fine, but I REALLY want to at least do
it this way for the Powkiddy X55 board and the Anbernic RGxx3 board.

While I have you, I have a related question I hope you can help with.
Is there any way to utilize the boot partitions of an eMMC device? I
don't know if the BROM of an RK3568 or RK3588 is capable, but I'd love
to have the SPL and U-Boot stages written to the eMMC boot partitions
instead of the user partition if I can.

Thank you.

> 
> Thanks,
> 
> - Kever
> 
> > 
> > Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
> > ---
> >   arch/arm/mach-rockchip/Makefile    |  4 ++--
> >   arch/arm/mach-rockchip/boot_mode.c | 11 ++++++++++-
> >   2 files changed, 12 insertions(+), 3 deletions(-)
> > 
> > diff --git a/arch/arm/mach-rockchip/Makefile b/arch/arm/mach-rockchip/Makefile
> > index 1dc92066bb..ff089ae949 100644
> > --- a/arch/arm/mach-rockchip/Makefile
> > +++ b/arch/arm/mach-rockchip/Makefile
> > @@ -15,13 +15,13 @@ obj-tpl-$(CONFIG_ROCKCHIP_PX30) += px30-board-tpl.o
> >   obj-spl-$(CONFIG_ROCKCHIP_RK3036) += rk3036-board-spl.o
> > -ifeq ($(CONFIG_SPL_BUILD)$(CONFIG_TPL_BUILD),)
> > -
> >   # Always include boot_mode.o, as we bypass it (i.e. turn it off)
> >   # inside of boot_mode.c when CONFIG_ROCKCHIP_BOOT_MODE_REG is 0.  This way,
> >   # we can have the preprocessor correctly recognise both 0x0 and 0
> >   # meaning "turn it off".
> >   obj-y += boot_mode.o
> > +
> > +ifeq ($(CONFIG_SPL_BUILD)$(CONFIG_TPL_BUILD),)
> >   obj-$(CONFIG_ROCKCHIP_COMMON_BOARD) += board.o
> >   obj-$(CONFIG_MISC_INIT_R) += misc.o
> >   endif
> > diff --git a/arch/arm/mach-rockchip/boot_mode.c b/arch/arm/mach-rockchip/boot_mode.c
> > index eb8f65ae4e..d2308768be 100644
> > --- a/arch/arm/mach-rockchip/boot_mode.c
> > +++ b/arch/arm/mach-rockchip/boot_mode.c
> > @@ -38,6 +38,10 @@ void set_back_to_bootrom_dnl_flag(void)
> >   #define KEY_DOWN_MIN_VAL	0
> >   #define KEY_DOWN_MAX_VAL	30
> > +#ifndef RK_DNL_ADC_CHAN
> > +#define RK_DNL_ADC_CHAN		1
> > +#endif
> > +
> >   __weak int rockchip_dnl_key_pressed(void)
> >   {
> >   	unsigned int val;
> > @@ -52,7 +56,8 @@ __weak int rockchip_dnl_key_pressed(void)
> >   	ret = -ENODEV;
> >   	uclass_foreach_dev(dev, uc) {
> >   		if (!strncmp(dev->name, "saradc", 6)) {
> > -			ret = adc_channel_single_shot(dev->name, 1, &val);
> > +			ret = adc_channel_single_shot(dev->name,
> > +						      RK_DNL_ADC_CHAN, &val);
> >   			break;
> >   		}
> >   	}
> > @@ -73,11 +78,13 @@ __weak int rockchip_dnl_key_pressed(void)
> >   void rockchip_dnl_mode_check(void)
> >   {
> > +#if CONFIG_IS_ENABLED(ADC)
> >   	if (rockchip_dnl_key_pressed()) {
> >   		printf("download key pressed, entering download mode...");
> >   		set_back_to_bootrom_dnl_flag();
> >   		do_reset(NULL, 0, 0, NULL);
> >   	}
> > +#endif
> >   }
> >   int setup_boot_mode(void)
> > @@ -90,6 +97,7 @@ int setup_boot_mode(void)
> >   	boot_mode = readl(reg);
> >   	debug("%s: boot mode 0x%08x\n", __func__, boot_mode);
> > +#if !defined(CONFIG_SPL_BUILD) && !defined(CONFIG_TPL_BUILD)
> >   	/* Clear boot mode */
> >   	writel(BOOT_NORMAL, reg);
> > @@ -103,6 +111,7 @@ int setup_boot_mode(void)
> >   		env_set("preboot", "setenv preboot; ums mmc 0");
> >   		break;
> >   	}
> > +#endif
> >   	return 0;
> >   }